Engineering Specifications &

Installation/Operating Instructions

Two Stage Split System Compressor Unit

EV 38 thru 58 Series

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Two Stage Split System

Compressor Unit

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TABLE OF CONTENTS

Section Title Page

I. Introduction to ECONAR Heat Pumps 2

II. Applications 3

III. Unit Sizing

A. Building Heat Loss / Heat Gain

B. Ground Sources and Design Water Temperatures

C. Temperature Limitations

3

IV Available Models

Performance Ratings, Configuration Options, Physical Data, Electrical

Data, Heating & Cooling Performance Data, Blower Performance Data,

Water Coil Pressure Drop Data

Correction Factors

5

V. Unit Location / Installation

A. Compressor Unit Installation

B. Refrigeration Line Set Installation

C. Installing Air Handler Unit, or Air Coil Unit

D. Evacuation and Testing

11

VI. Duct System / Blower 12

VII. Ground Source Design

A. Ground Loop Applications

B. Ground Water Applications

1. Ground Water Freeze Protection Switch

2. Water Coil Maintenance

12

VIII. Electrical Service 15

IX. 24 Volt Control Circuit

A. Room Thermostat

B. Split System Controller

C. Compressor Unit Controller

D. Compressor Unit Transformer

16

X. Startup / Checkout 20

XI. Service and Lockout Lights 20

XII. Room Thermostat Operation 21

XIII. Desuperheater (Optional) 21

XIV. Troubleshooting Guide for Lockout Conditions 23

XV. Troubleshooting Guide for Unit Operation 24

XVI Troubleshooting Guide for ECM Blower 26

XVII. Additional Figures, Tables, and Appendices

System Installation, Ground Loop and Ground Water Plumbing, Desuperheater

Installation, Refrigerant Diagram, Wiring Diagram.

27

2

I. INTRODUCTION TO ECONAR

HEAT PUMPS

Enertech Global, LLC, is home to ECONAR geothermal heat

pumps, a brand that has been in Minnesota for more than

twenty years. The cold winter climate has driven the design of

ECONAR heating and cooling equipment to what is known as

a "ColdClimate" geothermal heat pump. This cold climate

technology focuses on maximizing the energy savings

available in heating dominated regions without sacrificing

comfort. Extremely efficient heating, cooling,

dehumidification and optional domestic hot water heating are

provided in one neatly packaged system.

Enertech produces three types of ECONAR heat pumps:

hydronic, which transfers energy from water to water; forced

air, which transfers energy from water to air; and combination,

which incorporates the hydronic heating unit into a forced air

unit. Geothermal heat pumps get their name from the transfer

of energy to and from the ground. The ground-coupled heat

exchanger (geothermal loop) supplies the source energy for

heating and absorbs the discharged energy from cooling. The

system uses a compression cycle, much like your refrigerator,

to collect the ground's energy supplied by the sun and uses it

to heat your home. Since the process only moves energy, and

does not create it, the efficiencies are three to four times

higher than most efficient fossil fuel systems.

Safety and comfort are designed into every ECONAR

geothermal heat pump. Since the system runs completely on

electrical energy, the entire home can have the safety of being

gas-free. The best engineering and quality control is in every

heat pump. Proper application and correct installation will

ensure excellent performance and customer satisfaction. The

GeoSystems commitment to quality is written on the side of

every ECONAR heat pump built. Throughout the

manufacturing process, the technicians who assemble each

unit sign their names to the quality assurance label after

completing their inspections. As a final quality test, every unit

goes through a full run-test where the performance and

operation is verified in both the heating and cooling modes.

No other manufacturer goes as far as to run a full performance

check to ensure system quality.

This guide discusses Enertech line of ECONAR Two Stage

Split System for split system applications and the Two Stage

Compressor Unit with Air Coil Unit for add-on to Dual Fuel

applications. The fully pre-charged Compressor Unit uses R-

410A refrigerant, which is environmentally friendly to the

earth’s protective ozone layer; and has a factory-installed

Thermostatic Expansion Valve.

WARNING – Service of refrigerant-based equipment can be

hazardous due to elevated system pressures and hazardous

voltages. Only trained and qualified personnel should install,

repair or service. The installer is responsible to ensure that all

local electrical, plumbing, heating and air conditioning codes

are followed.

WARNING – INJURY OR DEATH CAN RESULT

FROM EXPLOSION WHEN OXYGEN IS USED TO

PURGE A REFRIGERANT SYSTEM. Never use air or

oxygen to purge or pressure test the refrigerant system.

Oxygen reacts violently with oil, and mixtures of air and

R410A may be combustible at pressures above 1 atmosphere.

WARNING – ELECTRICAL SHOCK CAN CAUSE

PERSONAL INJURY OR DEATH. Disconnect all power

supplies before installing or servicing electrical devices. Only

trained and qualified personnel should install, repair or service

this equipment.

CAUTION – Verify refrigerant type before servicing. The

nameplate on the heat pump identifies the type and the amount

of refrigerant. All refrigerant removed from these units must

be reclaimed by following accepted industry and agency

procedures.

CAUTION – Ground loops must be freeze protected, since

insufficient amounts of antifreeze may cause severe damage

and may void warranty. Never operate with ground flow

rates less than specified. Continuous operation at low flow

rates, or no flow, may cause severe damage and may void

warranty.

CAUTION – R410A refrigerant requires extra precaution

when service work is being performed. Invasion into the

refrigerant system must be a last resort. Ensure all other

diagnosis and methods have been used before attaching

refrigerant instruments and before opening the refrigerant

system. Synthetic oil (POE) is extremely hydroscopic,

meaning it has a strong chemical attraction to moisture. Brief

exposure to ambient air could cause POE to absorb enough

moisture that a typical vacuum may not remove.

NOTE:

All Pressure Drop Ratings are for Pure Water.

See Section IV for Correction Factors.

Performance Values are +/-10% and are subject to change

without notice.

COMMON ACRONYMS

DHW Domestic Hot Water

dP Pressure Differential

EWT Entering Water Temperature

ETL Electrical Testing Labs (founded

by Thomas Edison) – a Nationally

Recognized Testing Laboratory

GPM/gpm Gallons per Minute

Ground Loop Also known as Closed Loop

Ground Water Also known as Open Loop

GTF GeoThermal Transfer Fluid

HP High Pressure

LWT Leaving Water Temperature

LP Low Pressure

P/T

SR

Pressure/Temperature

Sensible Cooling Ratio

VA Volt Amperes

II. APPLICATIONS

Split System geothermal heat pumps consist of an Air Handler

Unit (AHU) and a Compressor Unit (CU) for indoor

installations to offer an extremely efficient and safe way to

provide the primary space heating and all the cooling for many

applications (see Figure 1). Also, the fully-charged CU, along

with an Air Coil Unit (ACU) can also be used for Dual Fuel

application to an existing central forced air fossil fuel or

electric heat system. In Dual Fuel applications, the CU and the

ACU take the place of the conventional central air

conditioning system to provide very high efficiencies.

CAUTION, CAUTION – The air blower in a Dual Fuel

application must have a minimum of two stages of air flow

that provides the required air flow.

Important – ENERGY STAR®, ETL, and other Agency

Certifications are based on proper matching of System

Components and operating conditions – No Exceptions!

Compressor

Unit

Air

Handler

Unit

(AHU)

Air Coil

Unit (ACU)

Line Set (25 feet)

Suction Liquid

EV38 FS3-x-2xV 35-9005 3/4 OD 3/8 OD

EV48 FS4-x-2xV 35-9005 7/8 OD 3/8 OD

EV58 FS5-x-2xV 35-9006 7/8 OD 3/8 OD

Important – Optimum system operation and reliability is

based on a Refrigerant Line Set of: 25-foot length, 3/8” OD

Liquid Line, 3/4” OD Vapor Line on the EV38 and 7/8” OD

Vapor Line on the EV48 and EV58, and 1/2” insulation on the

vapor line. Do not reduce or increase the length of the

Refrigerant Line Set.

Important – There should not be more than 20 feet of

vertical separation between the CU and the A-Coil.

Important – Dual Fuel applications are intended to take the

place of the central air conditioner on an existing installation,

so its capacity rating is generally the same as the central air

conditioner would have been, and its air flow is determined by

the air distribution system of the existing system. Because of

these limitations, supplemental heat from the existing system

may occasionally be needed on extreme cold days during the

heating season. On Dual Fuel applications, the refrigeration A-

Coil must be on the supply (outlet) of the supplemental

heating system.

Important – The Split System Controller has two factory

pre-set Jumper Plugs, JS and JL. Refer to the separate section

on the Split System Controller in this document for important

field adjustments that may be necessary.

Important – proper air flow of the Dual Fuel installation

must be provided as specified in order for the compressor to

run quieter and more efficiently.

Note – The CU installs indoors and has an internal

refrigeration compressor. A slight hum may be noticeable at

close distance. Improper installation may cause undesirable

noise levels.

Important – An electronic room thermostat designed and

configured for heat pump must be used. The compressor off-

delay setting must be at least 4 minutes for proper control

operation between the heat pump and a Dual Fuel heat system.

Note – The Two Stage Split System Controller has

sequences for Utility Dual Fuel applications that eliminate the

need for field-added sensitive and problematic “bonnet” or

“plenum” temperature switches.

III. UNIT SIZING

Selecting the unit capacity of a forced air geothermal heat

pump requires three things:

A) Building Heat Loss / Heat Gain.

B) Ground Sources and Design Water Temperatures.

C) Temperature Limitations

A. Building Heat Loss / Heat Gain The space load must be estimated accurately for any

successful HVAC installation. There are many guides or

computer programs available for estimating heat loss and gain,

including the Geothermal Heat Pump Handbook, Manual J,

and others. After the heat loss and gain analysis is completed,

Entering Water Temperatures (EWT’s) are established, and

the heat pump can now be selected using the heat pump

performance data. Choose the capacity of the heat pump based

on both heating and cooling loads.

B. Ground-Sources and Design Water

Temperatures Ground sources include the Ground Water (typically a well)

and the Ground Loop varieties. Water flow-rate requirements

vary based on configuration, and heat pump performance data

provides capacities at different water temperatures. Note:

Table 1 shows the water-flow (GPM) requirements and water-

flow pressure differential (dP) for the heat exchanger, and

Table 2 shows the dP multiplier for various levels of freeze

protection.

Table 1 – Ground-Side Flow Rate Requirements Series Flow dP* Flow dP*

(gpm) (psig) (gpm) (psig)

EV38 9 3.1 6 1.6

EV48 12 5.3 8 2.6

EV58 15 4.9 9 1.9

* dP (psig) heat exchanger pressure drops are for pure water. Note: dP values are for standard heat exchanger configurations.

Cupro Nickel heat exchanger configurations for Ground Water applications have higher dP.

Table 2 – Heat Exchanger Pressure Differential (dP)

Correction Factors for Freeze Protection (Typical) Anti-

Freeze

Percent

Volume

Freeze

Level

dP Multiplier

25oF 35oF 90oF 110oF

GTF(1) 50% GTF 12oF 125% 123% N/a N/a

Propylene Glycol

20% 18oF 136% 133% 118% 114%

25% 15oF 145% 142% N/a N/a (1)GTF = Geothermal Transfer Fluid. 60% water, 40% methanol.

1. Ground Loop Systems (see Figure 2)

Loop systems use high-density polyethylene pipe buried

underground to supply a tempered water solution back to the

heat pump. Loops operate at higher flow rates than ground

water systems because the loop Entering Water Temperature

4

(EWT) is lower. EWT affects the capacity of the unit in the

heating mode, and loops in cold climates are normally sized to

supply wintertime EWT to the heat pump down to 25oF.

2. Ground Water Systems (see Figure 3)

Note – If a heat pump is installed with ground water, it

should have a Cupro-Nickel water coil (EVxxx-x-VxxN).

Cupro-Nickel water coils withstand well water better than

standard water coils.

The design water temperature will be the well water

temperature in the geographic region for ground water

systems. Typical well water temperatures are in the 50oF range

in many cold climates. If well water temperature is lower than

50oF (Canadian well water can be as low as 40

oF), the flow

rate must be increased to avoid leaving water temperatures

below the freezing point. If well water temperatures are above

50oF (Some southern states are above 70

oF), the flow rates

may need to be increased to dump energy more efficiently

during the cooling mode.

Varying well water temperatures will have little effect on unit

capacity in the cooling mode (since the well is connected to

the heat pump condenser), but can have large effects on

capacity in the heating mode (since the well is connected to

the evaporator). If well water temperatures exceed 70oF,

special considerations such as closed loop systems should be

considered.

C. Temperature Limitations

Be aware of the operating range of the geothermal system

when sizing the particular heat pump to avoid premature

equipment failure. Operating outside of these limitations may

cause severe damage to the equipment and may void

warranty.

CAUTIONS; The acceptable Ground Loop EWT is 15

oF to 70

oF for

heating and 40oF to 100

oF for cooling.

The acceptable Ground Water EWT is 45oF to 70

oF for

heating and 40oF to 100

oF for cooling.

Cooling mode with EWT below 50oF should only be for

temporary operation. Continuous operation with EWT below

50oF requires addition of a method to keep head pressure

above 200 psig (such as a head pressure control or further

reduction of water flow).

IV. AVAILABLE MODELS

Performance Ratings

Ground Loop

AHRI/ISO 13256-1

HEATING

32ºF EWT

COOLING

77ºF EWT

HEATING

41ºF EWT

COOLING

68ºF EWT

MODELS Stage CFM GPM BTU/hr COP BTU/hr EER SR BTU/hr COP BTU/hr EER SR

EV 380/381 1st 910 9 23,300 3.9 28,900 22.0 .75

2nd 1180 9 30,500 3.5 38,000 14.4 .74

EV 480/481 1st 1295 12 31,500 3.9 40,000 23.9 .75

2nd 1680 12 39,800 3.4 49,000 15.8 .74

EV 580/581 1st 1425 15 37,500 3.8 49,000 22.5 .74

2nd 1850 15 48,600 3.4 60,000 15.5 .73

Performance Ratings

Ground Water

AHRI/ISO 13256-1

HEATING

50ºF EWT

COOLING

59ºF EWT

HEATING

50ºF EWT

COOLING

59ºF EWT

MODELS Stage CFM GPM BTU/hr COP BTU/hr EER SR BTU/hr COP BTU/hr EER SR

EV 380/381 1st 910 9 27,000 4.4 32,000 27.0 .73

2nd 1180 9 38,000 4.1 43,000 19.0 .72

EV 480/481 1st 1295 12 35,000 4.2 41,000 27.0 .73

2nd 1680 12 50,000 4.0 53,000 19.0 .72

EV 580/581 1st 1425 15 44,000 4.3 51,000 26.9 .73

2nd 1850 15 62,000 3.9 64,000 19.4 .71

Configuration Options – Compressor Unit

Model Suffix Description

EVxx0-x-VS2x Standard, No Desuperheater

EVxx1-x-VS2x Desuperheater

EVxxx-1-VS2x Standard, 208/230-1, 60 Hz

EVxxx-2-VS2x 208/230-3, 60 Hz

EVxxx-x-VS2O Standard Brazeplate Earth Loop

EVxxx-x-VS2N Cupro-Nickel Well Water Coil

6

Physical Dimensions

27.75"

21.25" 26.5"

Refrigerant

Vapor Line

0.88" Dia.

Knockouts

Access

Panel

In from

Ground

Out to

Ground

Refrigerant

Liquid Line

Out to

Water Heater

In from

Water Heater

Desuperheater

Model

Ground

Desuperheater

Refrig Connection

Inlets Outlets Liquid Vapor

EV38x – EV58x 1.0 FPT 1.0 FPT 1.0 FPT 3/8 OD 7/8 OD

Physical Data Description 38 48 58

Compressor Compliant Scroll

Expansion Device Thermostatic

Desuperheater Pump (HP) 1/150

Transformer (VA) 55

Unit Weight (lbs)* 210 220 230 * Unit Weight includes shipping pallet and materials.

Electrical Data (all HCAR-type circuit breaker per NEC)

Compressor Unit

Model

Voltage

Without PumpPAK With PumpPAK

Phase Compressor Total Min. Max PumpPAK Total Min. Max

Frequency (Hz) RLA LRA FLA Amp. Fuse HP FLA FLA Amp. Fuse

EV380/381 -1 208/230-1, 60 16.7 82 -- -- -- 1/3 3.6 20.3 24.5 40

EV380/381 -2 208/230-3, 60 11.2 58 11.2 14.0 25 -- -- -- -- --

EV480/481 -1 208/230-1, 60 21.2 96 -- -- -- 1/3 3.6 24.8 30.1 50

EV480/481 -2 208/230-3, 60 13.5 88 13.5 16.9 30 -- -- -- -- --

EV580/581 -1 208/230-1, 60 25.6 118 -- -- -- 1/2 5.4 31.0 37.4 60

EV580/581 -2 208/230-3, 60 17.6 123 17.6 22.0 35 -- -- -- -- --

EV 380/381-x-VS2x Heating and Cooling Performance Data

HEATING PERFORMANCE @ 68oF EAT

First Stage @ 910 cfm Second Stage @ 1180 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW COP Press Press /hr KW COP Press Press

15 9 7.2 3.1 15.3 1.5 3.0 60-70 240-258 23.1 2.2 3.1 55-65 246-266

20 9 7.2 3.1 17.0 1.5 3.2 70-80 249-269 25.3 2.2 3.3 63-73 257-277

25 9 7.2 3.1 18.6 1.6 3.5 77-87 260-280 27.5 2.3 3.5 72-82 269-289

30 9 7.2 3.1 20.2 1.6 3.7 86-96 271-291 29.7 2.4 3.6 80-90 281-301

35 9 7.2 3.1 21.8 1.6 3.9 94-104 283-303 31.8 2.5 3.7 89-99 293-313

40 7 4.6 2.0 22.9 1.6 4.1

98-112 290-314 33.2 2.5 3.8

93-108 305-325 9 7.2 3.1 23.5 1.7 4.1 34.0 2.6 3.9

6 3.7 1.6 23.7 1.7 4.2

103-122 300-325

34.2 2.6 3.9

90-115 316-336 45 7 4.6 2.0 24.7 1.7 4.3 35.7 2.6 4.0

9 7.2 3.1 25.1 1.7 4.3 36.2 2.7 4.0

6 3.7 1.6 25.3 1.7 4.4

107-132 311-336

36.3 2.7 4.0

109-124 323-348 50 7 4.6 2.0 26.3 1.7 4.5 37.8 2.7 4.1

9 7.2 3.1 26.7 1.7 4.5 38.3 2.7 4.1

6 3.7 1.6 28.4 1.7 4.8

125-150 329-359

40.4 2.8 4.2

120-145 342-372 60 7 4.6 2.0 29.5 1.8 4.9 42.1 2.9 4.3

9 7.2 3.1 30.0 1.8 4.9 42.7 2.9 4.3

6 3.7 1.6 31.4 1.8 5.1

140-165 351-381

44.5 3.0 4.4

130-160 366-396 70 7 4.6 2.0 32.8 1.8 5.3 46.4 3.0 4.5

9 7.2 3.1 33.2 1.8 5.3 47.0 3.1 4.5

COOLING PERFORMANCE @ 80oF DB/67oF WB

First Stage @ 910 cfm Second Stage @ 1180 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW EER Press Press /hr KW EER Press Press

6 3.7 1.6 36.9 0.8 44.0

123-138

155-175 47.6 1.9 25.3

123-138

178-198

40 7 4.6 2.0 37.4 0.8 46.1 150-170 48.3 1.8 26.4 173-193

9 7.2 3.1 37.8 0.8 48.1 140-160 48.8 1.8 27.6 163-183

6 3.7 1.6 34.3 1.0 33.4

126-141

185-205 45.0 2.1 21.1

124-139

215-235

50 7 4.6 2.0 34.8 1.0 35.0 180-200 45.6 2.1 22.1 210-230

9 7.2 3.1 35.2 1.0 36.5 172-192 46.1 2.0 23.0 200-220

6 3.7 1.6 31.8 1.2 26.1

128-143

222-242 42.3 2.4 17.8

126-141

250-270

60 7 4.6 2.0 32.2 1.2 27.3 217-237 42.9 2.3 18.6 245-265

9 7.2 3.1 32.6 1.1 28.5 207-227 43.4 2.2 19.4 235-255

6 3.7 1.6 29.2 1.4 20.8

132-147

257-277 39.7 2.6 15.1

127-142

286-306

70 7 4.6 2.0 29.6 1.4 21.7 252-272 40.2 2.5 15.8 281-301

9 7.2 3.1 29.9 1.3 22.7 242-262 40.7 2.5 16.5 271-291

6 3.7 1.6 27.9 1.5 18.6

132-147

275-295 38.4 2.8 13.9

128-143

300-320

75 7 4.6 2.0 28.3 1.5 19.5 270-290 38.9 2.7 14.6 295-315

9 7.2 3.1 28.6 1.4 20.3 260-280 39.3 2.6 15.2 290-310

6 3.7 1.6 26.7 1.6 16.7

135-150

295-320 37.1 2.9 12.9

129-144

322-342

80 7 4.6 2.0 27.0 1.5 17.5 290-315 37.6 2.8 13.5 317-337

9 7.2 3.1 27.3 1.5 18.2 275-300 38.0 2.7 14.1 307-327

6 3.7 1.6 24.1 1.8 13.5

135-150

330-355 34.4 3.1 11.0

130-145

355-380

90 7 4.6 2.0 24.4 1.7 14.1 325-350 34.9 3.0 11.5 350-375

9 7.2 3.1 24.7 1.7 14.7 310-335 35.3 2.9 12.0 340-365

6 3.7 1.6 22.8 1.9 12.1

135-150

355-385 33.1 3.3 10.2

131-146

371-396

95 7 4.6 2.0 23.1 1.8 12.7 350-380 33.6 3.1 10.7 366-391

9 7.2 3.1 23.4 1.8 13.3 335-365 33.9 3.1 11.1 356-381

6 3.7 1.6 21.6 2.0 10.9

140-155

365-395 31.8 3.4 9.4

131-146

385-415

100 7 4.6 2.0 21.9 1.9 11.4 357-387 32.2 3.3 9.9 380-410

9 7.2 3.1 22.1 1.9 11.9 342-372 32.6 3.2 10.3 370-400 Note: dP pressure drops apply to standard coils, and cupro-nickel ground water coils have higher pressure drops.

8

EV 480/481-x-VS2x Heating and Cooling Performance Data

HEATING PERFORMANCE @ 68oF EAT

First Stage @ 1295 cfm Second Stage @ 1680 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW COP Press Press /hr KW COP Press Press

15 12 12.3 5.3 19.0 2.1 2.7 58-68 229-249 30.0 3.0 2.9 53-63 256-276

20 12 12.3 5.3 21.3 2.1 3.0 65-75 240-260 33.0 3.1 3.1 61-71 267-287

25 12 12.3 5.3 23.7 2.1 3.3 75-85 250-270 36.0 3.2 3.3 69-79 277-297

30 12 12.3 5.3 26.0 2.2 3.5 82-92 260-280 38.9 3.3 3.4 77-87 288-308

35 12 12.3 5.3 28.3 2.2 3.8 90-100 270-290 41.9 3.4 3.6 85-95 299-319

40 10 8.8 3.8 29.9 2.2 4.0

93-108 275-300 43.8 3.5 3.7

88-103 305-330 12 12.3 5.3 30.6 2.2 4.0 44.9 3.5 3.7

8 6.0 2.6 31.2 2.2 4.2

95-115 285-310

45.3 3.5 3.8

88-111 316-341 45 10 8.8 3.8 32.5 2.2 4.3 47.2 3.6 3.9

12 12.3 5.3 33.0 2.2 4.3 47.8 3.6 3.9

8 6.0 2.6 33.4 2.2 4.4

105-125 295-320

48.1 3.6 3.9

95-119 326-351 50 10 8.8 3.8 34.8 2.2 4.5 50.1 3.7 4.0

12 12.3 5.3 35.3 2.3 4.5 50.8 3.7 4.0

8 6.0 2.6 37.8 2.3 4.9

120-140 310-340

53.7 3.8 4.1

119-134 343-373 60 10 8.8 3.8 39.4 2.3 5.0 55.9 3.9 4.2

12 12.3 5.3 39.9 2.3 5.0 56.7 3.9 4.2

8 6.0 2.6 42.2 2.3 5.3

130-155 330-360

59.3 4.0 4.3

125-155 364-394 70 10 8.8 3.8 44.0 2.4 5.4 61.8 4.1 4.5

12 12.3 5.3 44.6 2.4 5.4 62.7 4.1 4.5

COOLING PERFORMANCE @ 80oF DB/67oF WB

First Stage @ 1295 cfm Second Stage @ 1680 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW EER Press Press /hr KW EER Press Press

8 6.0 2.6 46.3 1.2 37.5

124-139

160-180 59.0 2.8 21.0

113-128

171-191

40 10 8.8 3.8 46.9 1.2 39.2 155-175 59.8 2.7 22.0 166-186

12 12.3 5.3 47.4 1.2 41.0 145-165 60.5 2.6 23.0 156-176

8 6.0 2.6 44.0 1.5 30.1

126-141

195-215 56.3 3.0 19.0

116-131

206-226

50 10 8.8 3.8 44.6 1.4 31.5 190-210 57.0 2.9 19.9 201-221

12 12.3 5.3 45.1 1.4 32.9 180-200 57.7 2.8 20.8 191-211

8 6.0 2.6 41.7 1.7 24.7

128-143

225-245 53.6 3.1 17.2

119-134

241-261

60 10 8.8 3.8 42.3 1.6 25.9 220-240 54.3 3.0 18.0 236-256

12 12.3 5.3 42.8 1.6 27.0 210-230 54.9 2.9 18.8 226-246

8 6.0 2.6 39.5 1.9 20.6

130-145

259-279 50.8 3.3 15.5

122-137

277-297

70 10 8.8 3.8 40.0 1.9 21.6 254-274 51.5 3.2 16.3 272-292

12 12.3 5.3 40.5 1.8 22.5 244-264 52.1 3.1 17.0 262-282

8 6.0 2.6 38.3 2.0 18.9

131-146

275-295 49.5 3.3 14.8

123-138

294-314

75 10 8.8 3.8 38.9 2.0 19.8 270-290 50.1 3.2 15.5 289-309

12 12.3 5.3 39.3 1.9 20.6 260-280 50.7 3.1 16.1 279-299

8 6.0 2.6 37.2 2.1 17.4

132-147

292-312 48.1 3.4 14.0

124-139

312-332

80 10 8.8 3.8 37.7 2.1 18.2 287-307 48.8 3.3 14.7 307-327

12 12.3 5.3 38.1 2.0 19.0 277-297 49.3 3.2 15.3 297-317

8 6.0 2.6 34.9 2.4 14.7

134-149

324-344 45.4 3.6 12.7

127-142

347-367

90 10 8.8 3.8 35.4 2.3 15.4 319-339 46.0 3.5 13.3 342-362

12 12.3 5.3 35.8 2.2 16.1 309-329 46.5 3.4 13.8 332-352

8 6.0 2.6 33.8 2.5 13.6

135-150

341-361 44.0 3.7 12.0

129-144

365-390

95 10 8.8 3.8 34.3 2.4 14.2 336-356 44.6 3.5 12.6 360-385

12 12.3 5.3 34.6 2.3 14.9 326-346 45.1 3.4 13.1 350-375

8 6.0 2.6 32.7 2.6 12.6

135-150

360-380 42.7 3.7 11.4

130-145

385-410

100 10 8.8 3.8 33.1 2.5 13.2 355-375 43.3 3.6 12.0 380-405

12 12.3 5.3 33.5 2.4 13.7 345-362 43.7 3.5 12.5 370-395 Note: dP pressure drops apply to standard coils, and cupro-nickel ground water coils have higher pressure drops.

EV 580/581-x-VS2x Heating and Cooling Performance Data

HEATING PERFORMANCE @ 68oF EAT

First Stage @ 1425 cfm Second Stage @ 1850 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW COP Press Press /hr KW COP Press Press

15 15 11.4 4.9 24.4 2.8 2.6 50-60 241-261 36.6 3.7 2.9 48-58 259-279

20 15 11.4 4.9 27.3 2.8 2.8 60-70 253-273 40.3 3.9 3.0 57-67 272-292

25 15 11.4 4.9 30.1 2.9 3.1 69-79 265-285 44.1 4.0 3.2 65-75 286-306

30 15 11.4 4.9 32.9 2.9 3.3 78-88 277-297 47.8 4.2 3.4 74-84 299-319

35 15 11.4 4.9 35.7 3.0 3.5 88-98 289-309 51.5 4.3 3.5 82-92 313-333

40 12 7.7 3.3 37.7 3.0 3.7

93-108 296-321 53.9 4.4 3.6

86-101 322-347 15 11.4 4.9 38.5 3.0 3.8 55.2 4.5 3.6

9 4.4 1.9 39.2 3.0 3.9

95-115 309-334

55.8 4.5 3.7

89-109 325-360 45 12 7.7 3.3 40.8 3.0 4.0 58.1 4.5 3.8

15 11.4 4.9 41.4 3.0 4.0 58.9 4.6 3.8

9 4.4 1.9 41.8 3.0 4.1

107-127 321-346

59.3 4.6 3.8

94-118 349-374 50 12 7.7 3.3 43.6 3.0 4.2 61.8 4.7 3.9

15 11.4 4.9 44.2 3.1 4.2 62.6 4.7 3.9

9 4.4 1.9 47.2 3.1 4.5

124-144 345-370

66.3 4.9 4.0

120-135 371-401 60 12 7.7 3.3 49.1 3.1 4.6 69.1 5.0 4.1

15 11.4 4.9 49.8 3.2 4.6 70.1 5.0 4.1

9 4.4 1.9 52.5 3.2 4.9

137-162 369-399

73.4 5.2 4.2

125-155 398-428 70 12 7.7 3.3 54.7 3.2 5.0 76.4 5.2 4.3

15 11.4 4.9 55.5 3.3 5.0 77.5 5.3 4.3

COOLING PERFORMANCE @ 80oF DB/67oF WB

First Stage @ 1425 cfm Second Stage @ 1850 cfm

Loop Loop dP dP MBTU Suct Head MBTU Suct Head

EWT GPM ft psi /hr KW EER Press Press /hr KW EER Press Press

9 4.4 1.9 55.1 1.4 39.6

117-132

160-180 67.3 2.9 23.3

104-118

165-185

40 12 7.7 3.3 55.9 1.3 41.5 155-175 68.2 2.8 24.4 160-180

15 11.4 4.9 56.5 1.3 43.3 145-165 69.0 2.7 25.4 150-170

9 4.4 1.9 52.2 1.8 29.6

121-136

193-213 64.9 3.2 20.1

107-122

202-222

50 12 7.7 3.3 52.9 1.7 31.0 188-208 65.7 3.1 21.1 197-217

15 11.4 4.9 53.5 1.7 32.3 178-198 66.5 3.0 22.0 187-207

9 4.4 1.9 49.3 2.1 23.1

123-138

228-248 62.4 3.6 17.6

109-124

240-260

60 12 7.7 3.3 49.9 2.1 24.1 223-243 63.2 3.4 18.4 235-255

15 11.4 4.9 50.5 2.0 25.2 213-233 63.9 3.3 19.2 225-245

9 4.4 1.9 46.3 2.5 18.5

126-141

262-282 59.9 3.9 15.4

122-127

278-298

70 12 7.7 3.3 47.0 2.4 19.3 257-277 60.7 3.8 16.1 273-293

15 11.4 4.9 47.5 2.4 20.2 247-267 61.4 3.6 16.9 263-283

9 4.4 1.9 44.9 2.7 16.7

127-142

279-299 58.7 4.0 14.5

114-129

296-316

75 12 7.7 3.3 45.5 2.6 17.4 274-294 59.5 3.9 15.2 291-311

15 11.4 4.9 46.0 2.5 18.2 264-284 60.1 3.8 15.8 281-301

9 4.4 1.9 43.4 2.9 15.1

128-143

297-317 57.4 4.2 13.6

115-130

315-335

80 12 7.7 3.3 44.0 2.8 15.8 292-312 58.2 4.1 14.3 310-330

15 11.4 4.9 44.5 2.7 16.5 282-302 58.9 4.0 14.9 300-320

9 4.4 1.9 40.5 3.3 12.4

131-146

331-351 55.0 4.5 12.1

118-133

353-373

90 12 7.7 3.3 41.0 3.2 13.0 326-346 55.7 4.4 12.7 348-368

15 11.4 4.9 41.5 3.1 13.6 316-336 56.3 4.3 13.2 338-358

9 4.4 1.9 39.0 3.4 11.3

132-149

352-367 53.7 4.7 11.4

120-135

371-396

95 12 7.7 3.3 39.5 3.3 11.9 347-362 54.5 4.6 11.9 366-391

15 11.4 4.9 40.0 3.2 12.4 337-352 55.1 4.4 12.5 356-381

9 4.4 1.9 37.5 3.6 10.4

133-150

365-390 52.5 4.9 10.8

121-136

392-417

100 12 7.7 3.3 38.0 3.5 10.8 360-385 53.2 4.7 11.3 387-412

15 11.4 4.9 38.5 3.4 11.3 351-375 53.8 4.6 11.8 377-402 Note: dP pressure drops apply to standard coils, and cupro-nickel ground water coils have higher pressure drops

10

Water Coil Pressure Drop Ratings (Pure Water)*

*Note: dP Pressure Drops apply to standard coils, and cupro-nickel ground water coils have higher pressure drops.

Note: Head Loss = Pressure Drop in PSI x 2.31.

Correction Factors

Entering Air Conditions CFM Airflow

ENTERING HEATING COOLING NOMINAL HEATING COOLING

AIR TEMP BTU/hr KW BTU/hr KW CFM BTU/hr KW BTU/hr KW

60oF DB 1.04 0.96 -- -- 80% 0.92 1.04 0.96 0.97

65oF DB 1.02 0.98 0.70 0.73 85% 0.95 1.03 0.97 0.98

70oF DB 1.00 1.00 0.79 0.83 90% 0.97 1.02 0.98 0.98

75oF DB/63oF WB 0.97 1.03 0.90 0.92 95% 0.99 1.01 0.99 0.99

80oF DB/67oF WB 0.93 1.07 1.00 1.00 100% 1.00 1.00 1.00 1.00

85oF DB/71oF WB -- -- 1.05 1.04 105% 1.01 0.99 1.01 1.01

110% 1.02 0.98 1.02 1.02

Ground Side Flow Rates

NOMINAL HEATING COOLING

GPM BTU/hr KW BTU/hr KW

60% 0.92 0.98 0.98 1.04

65% 0.93 0.98 0.98 1.04

70% 0.94 0.98 0.98 1.03

80% 0.96 0.99 0.99 1.02

90% 0.98 0.99 0.99 1.01

100% 1.00 1.00 1.00 1.00

110% 1.02 1.00 1.01 0.99

120% 1.04 1.00 1.02 0.98

Flow

GPM

EV38 EV48 EV58

dP Psig

6 1.6 -- --

7 2.0 2.0 --

8 2.5 2.6 1.6

9 3.1 3.2 1.9

10 3.8 3.8 2.3

11 4.3 4.5 2.8

12 4.8 5.3 3.3

13 -- 6.2 3.8

14 -- 7.1 4.3

15 -- 8.0 4.9

16 5.6

17 6.3

18 7.0

V. UNIT LOCATION / INSTALLATION

Three items make up the geothermal heat pump Split System:

1. Compressor Unit (CU)

2. Air Handler Unit (AHU)

3. Refrigerant line Set (RS).

Inspect for shipping damage immediately at delivery, and file

claims immediately with the shipping company. Check to

ensure that units have correct model numbers, electrical

ratings, and accessories that match the original order.

CAUTION – Units must be kept in an upright position

during transportation or installation, or severe internal damage

may occur.

Important – To ensure easy removal and replacement of

access panels, leave panels secured in place until the unit is set

in place and leveled.

Important – Locate the unit in an indoor area where the

ambient temperature will remain above 45oF. Service is done

primarily from the front. Top and rear access is desirable and

should be provided when possible.

CAUTION – Only the specified matched components shall

be used – No substitutes!

CAUTION – Do not use this unit during construction. Dust

and debris may quickly contaminate electrical and mechanical

components; resulting in damage.

CAUTION – Before driving screws into the cabinets, check

on the inside of the units to ensure the screw will not damage

electrical, water, or refrigeration lines.

The Installation Process is made up of these Steps:

1. Confirm sufficient air flow.

2. Confirm sufficient geosource fluid flow (GPM).

3. Confirm sufficient electrical service.

4. Remove the existing central air conditioning system (if

there is one); following appropriate industry refrigerant

reclaiming procedures.

5. Install the CU. Note – The CU is fully factory pre-

charged. Do not open the Service Valves at this time.

6. Install the AHU or ACU; keeping the A-Coil sealed until

braze connections will be made.

7. Install the Refrigerant Line Set; keeping it sealed until

braze connections will be made.

8. Wrap wet rags around the CU Service Valve stubs before

brazing to protect the Valves and the cabinet panel.

9. Open the braze connections, and braze the Refrigerant

Line Set to the CU and to the AHU or ACU. After

brazing, quench the joint with a wet rag to cool the joint

and remove any flux residue.

10. Evacuate the Refrigerant Line Set and the A-coil

properly. Ensure the access valve caps are fully restored

and properly tightened (finger tight plus 1/12th

turn (1/2

hex flat)).

11. Open the “frontseated” Service Valves properly and

ensure the caps are fully restored and properly tightened

(finger tight plus 1/12th

turn (1/2 hex flat)).

12. Re-check all braze connections for leaks.

13. Complete operational checkout.

A. Compressor Unit Installation

Important – The CU requires service access from both the

side and front. Note – The CU is fully factory pre-charged.

Important – Mount the CU on a vibration-absorbing pad

slightly larger than the base to provide isolation between the

unit and the floor. Water supply pumps should not be hard

plumbed directly to the unit; this could transfer vibration and

cause a resonating sound. Hard plumbing must be isolated

from building structures that could transfer vibration from the

unit through the piping to the living space.

CAUTION – For water line connections, always use plastic

male fittings into plastic female or into metal female fittings.

Never use metal male fittings into plastic female fittings. On

metal-to-metal fittings; use pipe thread compound, do not use

pipe thread tape, hand tighten first, and then only tighten an

additional ½ turn with a tool if necessary. On plastic fittings,

always use 2 to 3 wraps of pipe thread tape, do not use pipe

thread compound, hand tighten first, and then only tighten an

additional ½ turn with a tool if necessary. Do not over-tighten,

or damage may occur.

Important – A field-installed drain pan under the CU is

required when the possibility of an accidental water leak is a

concern.

Note – The CU has an internal filter/dryer and an internal

Thermostatic Expansion Valve with internal check valve.

Service Valves are of the frontseating type.

B. Refrigeration Line Set Installation

The typical installation is shown in Figure 1. The CU is fully

charged with R410A; including refrigerant for the A-Coil and

a 25’ line set with 3/8” OD liquid line. (The allowance for the

liquid line is 0.6 ounce per foot (15 ounces total for the 3/8”

liquid line)). Use ACR or L copper tubing and fittings, ensure

cutoff burrs are removed from the line openings, and blow out

the line with dry nitrogen before making connections.

Important – Do not reduce or increase the length of the

Line Set, or the refrigerant charge amount will be incorrect.

The vapor line must be 3/4” OD on the EV38 and 7/8” OD on

the EV48 and EV58 to ensure reliable oil return.

CAUTION – Insulation on the line set must be suitable for

heat pump application and be at least ½” thick. Under certain

heating-mode conditions, the refrigerant in the vapor line may

approach 200oF. Never reuse a refrigerant line set.

If the line set is kinked or distorted and can’t be formed back

to its original shape, replace the damaged portion of the line.

A deformation is defined as 10% of the cross section being

restricted and will affect performance. When passing line sets

through a wall, seal the opening with silicon-based caulk.

Important – Both the vapor line and the liquid line must be

isolated from direct contact with water pipes, duct work, floor

joists, wall studs or other structural components that could

transmit vibration and noise to the living space. Use hanger

straps with isolation sleeves to suspend refrigerant tubing from

joists.

Important – All brazing must be performed using nitrogen

circulating at 2-3 psig to prevent oxidation inside the tubing.

Use Silflo 15, or equivalent, for the braze material. Use wet

12

rags to protect Service Valves, and use shielding to protect the

finish on cabinets.

C. Installing Air Handler Unit or Air Coil Unit

Install the AHU for Split System applications, and install the

ACU for Dual Fuel applications. On Dual Fuel applications,

mount the ACU on the supply side (output) of an existing

furnace to avoid condensation in the furnace’s own heat

exchanger.

Important – Refer to and carefully follow the Installation

and Operating Instructions provided with the ECONAR Air

Handler Unit and the ECONAR Air Coil Unit for additional

important details. Note – ECONAR A-coils are factory-

sealed with a small holding charge of nitrogen. Prior to

brazing the refrigerant line set, cut off the ends to release the

holding charge.

D. Evacuation and Testing

After initial purging with nitrogen during and after brazing,

and with the Service Valves on the CU in the shipping

position (closed = clockwise, full in), evacuate the A-Coil and

Refrigerant Line Set to less than 200 microns for a minimum

of 20 minutes. Isolate the evacuation pump, and open the

service valves to release the refrigerant into the A-Coil.

Important: Ensure the Service Valves on the CU are fully

open and all valve caps are restored securely and tightened

properly (finger tight plus 1/12th

turn (1/2 hex flat)).

VI. DUCT SYSTEM / BLOWER

CAUTION – The Dual Fuel application uses the existing

central forced air blower, and that blower must have a

minimum of two stages of air flow that provides the required

air flow for the 2-Stage Two Stage Compressor Unit.

Existing ductwork must have the capacity to handle the air

volume required for proper heating and cooling. Undersized

duct work will cause noisy operation and poor heat pump

operating efficiencies due to lack of airflow.

Important – The Dual Fuel system should not be applied to

any zoned air distribution installations.

Important – Refer to and carefully follow the Installation

and Operating Instructions provided with the ECONAR Air

Handler Unit and the ECONAR Air Coil Unit for additional

important details.

VII. GROUND SOURCE DESIGN

Since water is the source of energy in the winter and the

energy sink in the summer, a good water supply is possibly the

most important requirement of a geothermal heat pump system

installation.

A. Ground Loop Installation

A Ground Loop system circulates the same antifreeze solution

through a closed system of high-density underground

polyethylene pipe. As the solution passes through the pipe, it

collects energy (in the heating mode) from the relatively warm

surrounding soil through the pipe and into the relatively cold

solution. The solution circulates to the heat pump, which

transfers energy with the solution, and then the solution

circulates back through the ground to extract more energy.

The Two Stage Split System is designed to operate on either

vertical or horizontal ground loop applications. Vertical loops

are typically installed with a well drilling rig up to 200 feet

deep, or more. Horizontal loops are installed with excavating

or trenching equipment to a depth of about six to eight feet,

depending on geographic location and length of pipe used.

Loops must be sized properly for each particular geographic

area, soil type, and individual capacity requirements. Contact

Enertech Customer Support or the local installer for loop

sizing requirements in your area.

Typical winter operating EWT to the heat pump on a Ground

Loop installation ranges from 25oF to 32

oF.

CAUTION – Ground Loops must be properly freeze

protected. Insufficient amounts of antifreeze may result in a

freeze rupture of the unit or can cause unit shutdown problems

during cold weather operation. Propylene glycol and

Geothermal Transfer Fluid (GTF) are common antifreeze

solutions. GTF is methanol-based antifreeze and should be

mixed 50% with water to achieve freeze protection of 12oF.

Propylene glycol antifreeze solution should be mixed 25%

with water to obtain a 15oF freeze protection.

Important – Do not mix more than 25% propylene glycol

with water in an attempt to achieve lower than 15oF freeze

protection, since more concentrated mixtures of propylene

glycol become too viscous at low temperatures and cannot be

pumped through the earth loop. Horizontal loops typically use

GTF, and vertical loops typically use propylene glycol.

Note – Always check State and Local codes for any special

requirements on antifreeze solutions.

Flow rate requirements for ground loops are higher (see Table

2) than ground water systems because water temperatures are

generally lower.

CAUTION – Never operate with flow rates less than

specified. Low flow rates, or no flow, may cause the unit to

shut down on a pressure lockout or may cause a freeze rupture

of the heat exchanger.

Important – Figure 2 shows that Pressure/Temperature

(P/T) ports must be installed in the entering and leaving water

lines of the heat pump. A thermometer can be inserted into the

P/T ports to check entering and leaving water temperatures. A

pressure gauge can also be inserted into these P/T ports to

determine the pressure differential between the entering and

leaving water. This pressure differential can then be compared

to the specification data on each particular heat pump to

confirm the proper flow rate of the system.

An individually-sized Enertech FlowCenter can supply

pumping requirements for the Ground Loop fluid, and can also

be used to purge the loop system. Note – Refer to

instructions included with the PumpPAK for properly purging

the ground loop.

Important – the pump must be installed to supply fluid into

the heat pump.

Filling and purging a loop system are very important steps to

ensure proper heat pump operation. Each loop must be purged

with enough flow to ensure two feet per second flow rate in

each circuit in the loop. This normally requires a 1½ to 3 HP

high-head pump to circulate fluid through the loop to remove

all the air out of the loop. Allow the pump to run 10 to 15

minutes after the last air bubbles have been removed. After

purging is completed, add the calculated proper amount of

antifreeze to give a 12oF to 15

oF freeze protection. After

antifreeze has been installed and thoroughly circulated, it

should be measured with a hydrometer, refractometer or any

other device to determine the actual freezing point of the

solution.

The purge pump can be used to pressurize the system for a

final static pressure of 30-40 psig after the loop pipe has had

enough time to stretch. In order to achieve the 30 to 40 psig

final pressure, the loop may need to be initially pressurized to

60-65 psig. This static pressure may vary 10 psig from heating

to cooling season, but the pressure should always remain

above 20 psig, so circulation pumps do not cavitate or pull air

into the system. Contact your local installer, distributor or

factory representative for more information.

B. Ground Water Installation

A Ground Water system gets its name from the open discharge

of water after it has been used by the heat pump. A well must

be available that can supply all of the water requirements (see

Table 2) of the heat pump for up to 24 hours/day on the

coldest winter day plus any other water requirements drawing

off of that same well.

Figure 3 shows the necessary components for ground water

piping. Shut-off valves and boiler drains on the entering and

leaving water lines are necessary for future maintenance.

Important – A screen strainer must be placed on the supply

line with a mesh size of 40 or 60 and enough surface area to

allow for particle buildup between cleanings.

Important – Pressure/Temperature (P/T) ports must be

placed in the supply and discharge lines so that thermometers

or pressure gauges can be inserted into the water stream.

Important – A visual flow meter must be installed to allow

visual inspection of the flow to determine when maintenance

is required. (If you can’t read the flow, cleaning is required.

See Water Coil Maintenance for cleaning instructions.)

A solenoid control valve must be installed on the water

discharge side of the heat pump to regulate the flow through

the unit. Wire the solenoid to the “Plug, Accessory” connector

on the controller. This valve opens when the unit is running

and closes when the unit stops.

Schedule 40 PVC piping, copper tubing, polyethylene or

rubber hose can be used for supply and discharge water lines.

Make sure line sizes are large enough to supply the required

flow with a reasonable pressure drop (generally 1” diameter

minimum).

Water discharge is typically made to a drain field, stream,

pond, surface discharge, tile line, or storm sewer.

Important –ensure the discharge line has a pitch of at least

three inches per 12 feet, has a minimum 2 feet of unobstructed

freefall at the discharge outlet, and has at least 100 feet of

unobstructed grade sloping away from the discharge outlet.

CAUTION – A drain field requires soil conditions and

adequate sizing to ensure rapid percolation. Consult local

codes and ordinances to assure compliance. DO NOT

discharge water to a septic system.

CAUTION – Never operate with flow rates less than

specified. Low flow rates, or no flow, may cause the unit to

shut down on a pressure lockout or may cause a freeze rupture

of the heat exchanger.

1. Ground Water Freeze Protection CAUTION – Only specifically ordered equipment with a

factory-installed 60 psig low-pressure switch can be used on

Ground Water applications. (The low-pressure switch on a

Ground Loop system has a 35 psig nominal cutout pressure.)

If the water supply to the heat pump were interrupted for any

reason, continued operation of the compressor would cause the

water remaining in the heat exchanger to freeze, rupture the

heat exchanger, and may void warranty.

2. Water Coil Maintenance Water quality is a major consideration for ground water

systems. Problems can occur from scaling, particle buildup,

suspended solids, corrosion, pH levels outside the 7-9 range,

biological growth, or water hardness of greater than 100-PPM.

If poor water quality is known to exist in your area, a cupro-

nickel water coil may be required when ordering the system;

or installing a ground loop system may be the best alternative.

Water coil cleaning on ground water systems may be

necessary on a regular basis. Depending on the specific water

quality, the water coil can be cleaned by the following

methods (Note – always remember to clean the strainer.):

a. Chlorine Cleaning (Bacterial Growth)

1. Turn off all power to the heat pump during this procedure.

2. Close the shut-off valves upstream and downstream of the

heat exchanger.

3. Connect a submersible circulating pump to the hose bibs

on the entering and leaving water sides of the heat

exchanger for reverse-direction flow.

4. Submerse the pump in a five-gallon pail of water with

enough chlorine bleach to kill the bacteria. Suggested

mixture is 1 part chlorine bleach to 4 parts water.

5. Open the hose bibs to allow circulation of the solution.

CAUTION – DO NOT allow the chlorine mixture to

stand idle in the heat exchanger.

6. Start the pump and circulate the solution through the heat

exchanger for about 15 minutes with at least 150% of the

normal rated flow rate. The solution should change color to

indicate the chlorine is killing and removing the bacteria

from the heat exchanger.

7. Flush out the used solution by adding a fresh water supply

14

to the pail. Repeat until the leaving water is clear.

This procedure can be repeated annually, semiannually, or as

often as it takes to keep bacteria out of the heat exchanger, or

when bacteria appears in the visual flow meter to the point the

flow cannot be read.

Another alternative to bacteria problems is to shock the entire

well. Shocking the well may give longer term relief from

bacteria problems than cleaning the heat exchanger, but will

probably need to be repeated, possibly every three to five

years. Contact a well driller in your area for more

information.

b. Muriatic Acid Cleaning (Difficult Scaling/Particle

Buildup Problems) 1. WARNING – Consult installer because of the dangerous

nature of acids. Only an experienced and trained

professional should perform this procedure. (Note – Use

Oxalic Acid, CLR, Iron-Out, or other de-scaling products

before using Muriatic Acid.)

2. Turn off all power to the heat pump during this procedure.

3. Close the shut-off valves upstream and downstream of the

heat exchanger.

4. Connect a submersible circulating pump to the hose bibs

on the entering and leaving water sides of the heat

exchanger for reverse-direction flow. Note – these are

corrosive chemicals. Use a disposable or suitable pump.

5. Submerse the pump in a five-gallon pail of water with a

small amount of muriatic acid to create a final

concentration of 5% muriatic acid.

WARNING – Always add acid to water; never add water to

acid.

6. Open the hose bibs to allow circulation.

7. Start the pump and circulate the solution through the heat

exchanger for about 5 minutes until there are no longer any

air bubbles.

8. Stop the pump, and let the solution stand for about 15

minutes.

9. Flush out the used solution by adding a fresh water supply

to the pail. Repeat until the leaving water is clear.

c. Freeze Cleaning (Scaling/Particle Buildup)

This applies only to Cupro Nickel heat exchangers, cylinder

shape, used on Ground Water Applications. WARNING –

Never attempt this process on a braze plate heat exchanger. It

could cause the braze plate heat exchanger to rupture and may

void warranty.

I. Before using the freeze cleaning procedure, verify it needs

to be done by answering the following questions.

1. Determine and verify that the required water flow rate in

GPM is both present and correct.

2. Determine the temperature differential of the water. Under

normal conditions in the cooling mode, there should be a

temperature difference of about 10-15°F between the

supply side and discharge side. If the temperature

difference is 8°F or less, consideration should be given to

cleaning the water coil.

II. If the water coil requires cleaning, carefully use the

following steps for the freeze cleaning method.

1. Turn off the heat pump and its water supply.

2. Open a plumbing connection on the water supply side, if

possible, to break the system vacuum and allow easier

drainage of the system and water coil.

3. Drain the water out of the system and water coil via the

boiler drains on the entering and leaving water lines, and

the drain on the heat exchanger.

WARNING – FAILURE TO COMPLETELY DRAIN THE

WATER COIL HEAT EXCHANGER COULD POSSIBLY

RESULT IN A FREEZE RUPTURE!

4. Set the room thermostat to "Heat" to start the heat pump in

the heating mode and quickly freeze the coil.

5. Allow the heat pump to run until it automatically shuts off

on low pressure and then turn the room thermostat to the

"Off" position.

6. Recap the water coil drain and tighten any plumbing

connections that may have been loosened.

7. If so equipped, open the field installed drain cock on the

water discharge side of the heat pump, and install a short

piece of rubber hose to drain into a drain or bucket. A drain

cock on the discharge side allows water flow to bypass the

solenoid valve, flow valve, flow meter, or any other item

that may be clogged by mineral debris. Draining to a

bucket helps prevent clogging of drains and allows

observing effectiveness of the procedure.

8. Turn on the water supply to the heat pump to start the

process of flushing any mineral debris from the unit.

9. Set the room thermostat to "Cool" and start the heat pump

in the cooling mode to quickly thaw the water coil.

10. Run the heat pump until the water coil is completely

thawed out and loosened scale, mineral deposits, or other

debris is flushed completely from the water coil. Allow at

least 5 minutes of operation to ensure that the water coil is

thoroughly thawed out.

11. If the water still contains mineral debris, and if the flow

through the unit did not improve along with an increase in

the temperature difference between the water supply and

water discharge, repeat the entire procedure.

12. Reset the heat pump for normal operation.

VIII. ELECTRICAL SERVICE

Note – Always refer to the inside of the electrical box cover

for the correct wiring diagram, and always refer to the

nameplate on the exterior of the cabinet for the correct

electrical specifications.

WARNING – ELECTRICAL SHOCK CAN CAUSE

PERSONAL INJURY OR DEATH. Disconnect all power

supplies before installing or servicing electrical devices. Only

trained and qualified personnel should install, repair or service

this equipment.

WARNING – THE UNIT MUST BE PROPERLY

GROUNDED!

The main electrical service must be protected by a fuse or

circuit breaker and be capable of providing the amperes

required by the unit at nameplate voltage. All wiring must

comply with the national electrical code and/or any local

codes that may apply. Access to the line voltage contactor is

through the knockouts provided on the side of the heat pump

next to the front corner. Route EMT or flexible conduit with

appropriate size and type of wire.

Ensure adequate supply wiring to minimize the level of

dimming lights during compressor startup on single-phase

installations. Some dimming is normal, and a variety of start-

assist accessories are available if dimming is objectionable.

Important – some models already have a factory-installed

start assist. Do not add additional start assists to those units.

CAUTION – route field electrical wiring to avoid contact

with electrically live bare metal parts inside the electrical box

and to avoid contact with the surface of the factory-installed

start assist (if provided).

CAUTION – Three-phase units must be wired properly to

ensure proper compressor rotation. Improper rotation may

result in compressor damage. An electronic phase sequence

indicator must be used to check supply-wiring phases. Also,

the “Wild” leg of the three-phase power must be connected to

the middle leg on the contactor.

Important – Only 208Vac FlowCenters can be wired

directly to the compressor contactor and can be grounded in

the grounding lug for 208/230Vac. An alternative loop pump

or a pump for a different supply voltage must be powered

from a separate fused power supply and controlled through an

isolation relay that has its coil wired to the contactor circuit.

IX. 24 VOLT CONTROL CIRCUIT

Note – Always refer to the inside of the electrical box cover

for the correct wiring diagram.

Important – All 24V control wiring should be 18 gage

minimum.

There are four basic sections of the low voltage circuit;

Thermostat, Split System Controller, Compressor Unit

Controller, and Compressor Unit transformer.

A. Room Thermostat At a minimum, a 3-heat/2-cool room thermostat specifically

configured for heat pump must be used. The room thermostat

controls all stages of operation of the heat pump. Initiation of

each stage is implemented based on the recovery rate of the

actual temperature to the set point temperature. This means

that switching to a higher stage may require time (sometimes

15 minutes or more) for the thermostat to calculate rate of

change. Consult the instructions in the room thermostat box

for proper mounting, Installer Set-up, and operation.

Important – Be careful to select a room thermostat location

where external temperature sources will not affect sensed

temperature.

Important – If a single room thermostat controls multiple

heat pumps, the control wiring of the heat pumps must be

isolated from each other with isolation relays to avoid

excessive voltages or overheating and premature failure of the

control components.

Important – Room thermostat cable with at least nine

conductors must be run from the Split System Controller in

the CU to the room thermostat.

Note – Carefully consider the use of thermostat setback

periods during the heating season, since the recovery from a

setback period is likely to use supplemental heat.

Important – On a Dual Fuel application, the compressor

off-delay on the room thermostat must be at least 4 minutes

for proper control operation.

B. Split System Controller

The Split System Controller manages interactions between the

room thermostat, the CU, and the AHU on split system

applications; and between the room thermostat, the CU, and

the fossil fuel furnace on dual fuel applications.

Important – Two Jumper plugs, JS and JL are factory-

installed and may need adjusting for proper system operation

depending on the application. JS is at the top-center of the

Split System Controller, and JL is at the lower-center. JS

configures the system for either Split System or for Dual Fuel

application, and JL configures how W2 is latched either to Y

or to Y2.

Application

W2 Latch

Control

Desired

JS

Position

JL

Position

Split System*

No W2 Latch* Installed* Center*

W2 Latch to

Y

Installed* Left (Y)

W2 Latch to

Y2

Installed* Right (Y2)

Dual Fuel** W2 Latch to

Y

Removed Left (Y)

*Note: denotes factory-installed position. **Note: W2 must be latched to Y for Dual Fuel applications.

AHU Split System Operation

The JS jumper plug MUST remain installed for Split System

applications to allow both the compressor and the auxiliary

heat to operate simultaneously. The Fan (G) from the room

thermostat provides input to the Split System Controller to

request the AHU blower to turn on. Stage 1 from the room

thermostat provides inputs to the Split System Controller G

and Y terminals to request the AHU blower and the CU

compressor to turn on. Stage 2 from the room thermostat

provides input to the Split System Controller Y2 terminal to

request the AHU blower speed to change and the CU

compressor to go to stage 2 capacity. Stage 3 from the room

thermostat provides input to the Split System Controller W2

terminal to request the AHU blower speed to change and the

AHU auxiliary heat (if provided) to turn on.

Dual Fuel Add-On Operation

Note – Variations of room thermostats and fossil fuel

furnace controls available in the market may cause slight

variations of control functionality on a Dual Fuel application;

16

such as extended blower overrun timings. The compressor off-

delay setting on the room thermostat must be at least 4

minutes for proper control operation between the heat pump

and a Dual Fuel heat system.

Important – The JS jumper plug MUST be removed for

Dual Fuel applications to prevent the compressor and the

fossil fuel furnace from operating simultaneously, and the JL

jumper plug MUST be moved to the Left (Y) Position.

The Fan (G) from the room thermostat provides input to the

Split System Controller to request the blower in the fossil fuel

furnace to turn on at Low (G) speed. Stage 1 from the room

thermostat provides inputs to the Split System Controller G

and Y terminals to request the blower and the CU compressor

to turn on. Stage 2 from the room thermostat provides input to

the Split System Controller Y2 terminal to request the blower

speed to change and the CU compressor to go to stage 2

capacity. When Stage 3 from the room thermostat provides

input to the Split System Controller W2 terminal with the JS

jumper removed and the JL jumper on the Left (Y) position,

the controller will;

1. Turn off the CU compressor.

2. Energize the fossil fuel furnace heating mode, and the

fossil fuel furnace then will control its blower.

3. Latch control of the fossil fuel furnace to Stage 1 of the

room thermostat until Stage 1 turns off.

4. When Stage 1 of the room thermostat turns off, the

system returns to “standby.”

Split System Controller

Important – The Split System Controller requires two

sources of 24Vac transformer power; 1) one inside the CU to

power the CU components, and 2) one inside the AHU (or

fossil fuel furnace) to power the room thermostat and AHU (or

fossil fuel furnace) components.

The Split System Controller provides the following:

1. Wiring connections to the AHU for split system

application or wiring connections to the fossil fuel furnace

on dual fuel application.

2. Wiring connections to the room thermostat.

3. Wiring connections to the CU controller.

4. Wiring connections to a Utility dual fuel radio control.

5. Wiring connections for Alarm Output.

6. Split System Controller Indicator lights.

7. W2 latch function.

1. Wiring Connections to AHU or Fossil Fuel Furnace

Note – The Split System Controller uses the 24Vac

transformer power from the AHU (or from the fossil fuel

furnace on Dual Fuel applications) to power the room

thermostat. This 7-position set of terminals at the bottom-

center of the Split System Controlled is labeled Y2 E R G Y W

C.

a. Y2 – energizes the blower motor in the AHU, or fossil

fuel furnace, at the Y2 speed.

b. E – used for Split System applications to energize

supplemental electric heat in the AHU. Important –

Do not connect E terminal on Dual Fuel applications.

c. R and C – 24Vac power from the AHU (or the fossil fuel

furnace) transformer.

d. G – energizes the blower motor in the AHU, or fossil

fuel furnace, at Low(G) speed.

e. Y – energizes the blower motor in the AHU, or fossil

fuel furnace, at the Y speed.

f. W – energizes the blower motor in the AHU at heating

speed. On Dual Fuel, the W output energizes heating-

mode operation of the fossil fuel furnace.

2. Wiring Connections to Room Thermostat

This 9-position set of terminals at the bottom-left of the Split

System Controlled is labeled Y2 E R G O Y W2 L C.

a. Y2 – from the room thermostat energizes the Y2 output

(¼” quick connect) going to the CU Controller and the

Y2 output going to the AHU, or fossil fuel furnace.

Important – The transformer in the AHU (or fossil

fuel furnace on Dual Fuel) provides the 24Vac power for

both Y2 outputs.

b. E – from the room thermostat energizes the E output to

the AHU. Important – Do not connect E terminal on

Dual Fuel applications.

c. R and C – 24Vac power passed through from the AHU,

or fossil fuel furnace transformer.

d. G – from the room thermostat energizes the G output to

the AHU, or fossil fuel furnace.

e. O – from the room thermostat energizes the O output

(¼” quick connect) going to the CU Controller.

f. Y – from the room thermostat energizes the Y output

(¼” quick connect) going to the CU Controller and the Y

output going to the AHU, or fossil fuel furnace.

g. W2 – from the room thermostat energizes the W output

going to the AHU, or fossil fuel furnace and energizes

the W (¼” quick connect) going to a desuperheater pump

relay. Important – The transformer in the AHU (or

fossil fuel furnace on Dual Fuel) provides the 24Vac

power for this W2 output

h. L – to the room thermostat to energize an optional alarm

indicator light in the room thermostat.

3. Wiring Connections to CU Controller

These are ¼” quick connect terminals X Y2 Y O R D W on the

left and right side of the Split System Controller.

a. X and R – 24Vac power from the CU’s transformer.

b. Y2 – to the compressor energizes the compressor bypass

valve (VB) for stage 2 capacity. Important – The

transformer in the AHU (or fossil fuel furnace on Dual

Fuel) provides the 24Vac power for this Y2 output.

c. W – to a relay turns off the desuperheater pump during a

E R G O Y L CW2 E R G Y W C

DY

O

R

X

JS W

U1 U2 D1 D2

Y2

JLY Y2

Y2 Y2

Utility Dual Fuel

& Alarm Output

AHU or Furnace

Connections

Room Thermostat

Connections

JL Jumper Plug JS Jumper PlugIndicator LEDs

W2 input from the room thermostat. Important – The

transformer in the AHU (or fossil fuel furnace on Dual

Fuel) provides the 24Vac power for this W output.

d. Y – to the CU Controller energizes the compressor

contactor.

e. O – to the CU Controller energizes the 4-way reversing

valve.

f. D – from the CU Controller energizes the L and D1/D2

outputs.

4. Wiring to Utility Dual Fuel Radio Control

Note – This connection assumes the Utility Dual Fuel Radio

control has a Normally Closed (NC) contact that opens when

the Utility decides to shut off the compressor. Replace the

jumper link between U1 and U2, with the NC contacts of the

Utility Dual Fuel Radio control.

Utility

Dual Fuel

Radio

Replace U1/U2 jumper link

with Utility Dual Fuel

Radio

U1 U2 D1 D2Split System

Controller

5. Wiring Connections for Alarm Output

The D1 and D2 terminals provide an isolated dry contact

output that closes any time the CU Controller is in lockout.

The contact rating is 2mA minimum to 10VA sealed and

20VA inrush at 24Vac.

6. Split System Controller Indicator Lights

The Split System Controller has green LED indicator lights to

indicate system operation.

For the AHU terminal set:

1. R – 24Vac power from the AHU or fossil fuel furnace

transformer.

2. G – output is energized.

3. W – output is energized.

For the ¼” quick connect terminals to the CU Controller:

1. R – 24Vac power from the CU transformer.

2. Y – output is energized.

3. O – output is energized.

7. W2 Latch Function

This function must be used on Dual Fuel applications, and the

JL jumper plug must be on the Left (Y) position to latch W2 to

Y when the room thermostat energizes auxiliary heat.

W2 Latch may be used on Split System applications to reduce

long periods of uninterrupted compressor operation, and the

JL jumper plug can be either on the Y or Y2 position to latch

W2 to either Y or Y2, respectively. Once energized, the latch

remains on until the room thermostat turns off the compressor

stage.

C. Compressor Unit Controller The CU controller receives a signal from the thermostat and

initiates the correct sequence of operations for the heat pump.

The controller performs the following functions:

1. Compressor Anti-Short-Cycle

2. Compressor Control

3. Ground Loop Pump / Ground Water Initiation

4. 4-Way Valve Control

5. Compressor Lockouts

6. Air Coil Defrost

7. System Diagnostics

8. 24Vac Fuse

9. Plug Accessory

10. Excessive Condensate Level Sensing

1. Compressor Anti-Short-Cycle

An Anti-Short-Cycle (ASC) is a delay period between the time

a compressor shuts down and when it is allowed to come on

again. This protects the compressor and avoids nuisance

lockouts for these two conditions;

1. A 70 to 130-second random time-out period occurs before

a re-start after the last shut down.

2. A 4-minute/25-second to 4-minute/45-second random-start

delay occurs immediately after power is applied to the heat

pump. This occurs only after reapplying power to the unit.

To reduce this timeout delay while servicing the unit, apply

power, disconnect and reapply power very quickly to the

CU to shorten the delay.

Note - The thermostat supplied with the heat pump may

also have a delay period after compressor shutdown before it

will start again.

2. Compressor Control

When 24Vac is applied to the Y terminal on the CU controller

wiring block, the controller decides, based on lockout and

anti-short-cycle periods, when to turn on the compressor

contactor. The M1 output of the controller energizes the

contactor until 24Vac is removed from the Y terminal.

3. Ground Loop Pump / Ground Water Initiation

On ground loop systems, a M1 output from the controller

energizes the contactor to start the compressor and the ground

loop pump. For Ground Water systems, the M1 output will

also energize the ground water solenoid valve through the

“Plug Accessory” connector.

4. 4-Way Valve Control

When 24Vac is applied to the O terminal on the CU wiring

block, the controller energizes its O output to provide 24Vac

power to the 4-way reversing valve to switch the refrigerant

circuit to the cooling mode.

5. Compressor Lockouts

The controller will lock out the compressor if either the high-

pressure 600 psig or the low-pressure 35 psig on ground loop

(or 60 psig on ground water) switch opens. This lockout

condition means that the unit has shut down to protect itself,

and will not come back on until power has been disconnected

(via the circuit breaker) to the heat pump for one minute.

Typical problems that could cause a lockout situation include:

1. Low water flow or extreme water temperatures

2. Low air flow or extreme air temperatures

3. Jumper JS on the Split System Controller not removed on

Dual Fuel add-on application

18

4. Cold ambient air temperature conditions

5. Internal heat pump operation problems.

6. Optional Excessive Condensate Level

If a lockout condition exists, the heat pump should not be

reset more than once; and a service technician should be

called immediately.

CAUTION – Repeated reset may cause severe damage to

the system and may void warranty. The cause of the lockout

must be determined and corrected.

6. Air Coil Defrost

Restricted airflow in the cooling mode, caused by a dirty air

filter or airside heat exchanger, may result in an iced up air

coil and/or low suction pressure. The controller will

automatically switch the heat pump to defrost mode if the low-

pressure switch opens during the cooling mode: the O output

will be de-energized to run the unit in heating, the blower will

continue to run, and the Low Pressure indicator light will

blink. This defrost mode will last for approximately 80

seconds, then the unit will go to the 70-130-second time-out

re-start delay. After the delay times out, the heat pump will

resume normal operation.

CAUTION – If the heat pump continually goes to the air

coil defrost mode, a service technician should be called

immediately.

7. System Diagnostics

The CU controller is equipped with diagnostic LED lights to

indicate system status. The lights indicate the following

conditions:

1. 24 Volt system power GREEN

2. Fault or Lockout YELLOW

3. Anti-short-cycle mode RED

If a room thermostat installed with the heat pump system has a

lockout indicator, the controller will send a signal from L on

the terminal strip to a LED on the thermostat to indicate a

lockout condition.

8. 24 Vac Fuse

The CU controller has a glass-cartridge fuse located on the

circuit board adjacent to the 24Vac power connector. The

green system power LED will be off if this fuse is open. A

spare fuse is located in the saddle attached to the side of the

24Vac power connector.Note – Ensure the new fuse fits

tightly in the fuse clips after replacement.

9. Plug Accessory (PA)

The Plug Accessory output is internally connected to the M1

output and is energized whenever M1 turns on the compressor

contactor. The maximum rating of this output is 10VA sealed

and 20VA inrush and is typically intended to power a 24Vac

ground water solenoid valve.

10. Excessive Condensate Level

An optional float switch can be mounted to the condensate

drain pan, and its normally closed (NC) contacts can be wired

into the blue wire that jumpers DT to X on the CU controller.

Important – the NC contacts must have a dry-contact

rating.

D. Compressor Unit Transformer A transformer internal to the CU provides 24Vac for all

control features of the CU. The transformer is larger than the

industry standard, but it is in a warm electrical box and can be

overloaded quickly.

Transformer Usage (VA)

Component -VS2x

Contactor 7

Reversing Valve 8

Controller 20-1038 2

Thermostat 1

Split System Controller 2

Plug Accessory (PA) 10

Total 30 VA

Transformer VA size 55

Important – If the system’s external controls require more

than shown in table 5, an external transformer and isolation

relays should be used.

Important – Miswiring of 24Vac control voltage on system

controls can result in transformer burnout.

Important – Units with a dual voltage rating (example,

208/230) are factory-wired for the higher voltage (example,

230). If connected to a power supply having the lower voltage,

change the wiring to the transformer primary to the correct

lead; otherwise premature failure, or inability to operate the

control components may occur.

X. STARTUP / CHECKOUT

Before applying power to the heat pump, check the following

items:

Water supply plumbing to the heat pump is completed and

operating. Manually open the water valve on well systems

to check flow. Ensure all valves are open and air has been

purged from a loop system. Never operate the system

without correct water flow.

All high voltage and low voltage wiring is correct and

checked out, including wire sizes, fuses and breakers. Set

thermostat to the “OFF” position.

The heat pump is located in a warm area (above 45oF).

Starting the system with low ambient temperature

conditions is more difficult. Do not leave until the space is

brought up to operating temperatures.

Ensure refrigerant service valves in the CU are open.

You may now apply power to the CU the AHU, or fossil fuel

furnace. A 4-minute/35-second power-up delay is

programmed in the CU Controller before the compressor will

operate. During this time you can verify airflow with the

following procedure:

Place the thermostat in the “FAN ON” position. The

blower should start. Check airflow at the registers to ensure

they are open and that air is being distributed throughout

the house. When airflow has been checked, move the

thermostat to the “FAN AUTO” position. The blower

should stop.

The following steps will ensure the system is heating and

cooling properly. After the initial time-out period, the red

indicator light on the CU Controller will shut off. The heat

pump is now ready for operation.

With the thermostat in the “HEAT” mode, turn it up to its

highest temperature setting. Note – remove the W input

from the thermostat from the Split System Controller on

Dual Fuel applications to prevent a thermostat request on

W from turning off the compressor and starting the fossil

fuel furnace. The blower and compressor should start. The

thermostat may have its own compressor delay (shown by

“Wait” on the thermostat), but the compressor will start

after all delays.

After running the unit for 5 minutes, check the airside

return and supply temperatures. An air temperature rise of

20oF to 30

oF is normal in the heating mode, but variations

in water temperature and water flow rate can cause

variations outside the normal range. Use a single pressure

gauge to check the fluid pressure drop through the ground-

side heat exchanger to ensure proper flow for the system.

On Dual Fuel applications, reconnect the W input to the

Split System Controller. The compressor should turn off

and the fossil fuel furnace should turn on.

Next, set the thermostat to “COOL” and turn down to its

lowest setting. The blower will start, and the compressor

will start after an anti-short cycle period of 70 to 130

seconds from its last shutdown.

After the unit has run in cooling for 5 minutes, check the

airside return and supply temperatures. An air temperature

drop of 15oF to 20

oF is normal in the cooling mode but

airflow and humidity can affect temperature drop.

Set the thermostat for normal operation.

Instruct the owner on the correct operation of the entire

heat pump/furnace system. The unit is now operational.

XI. SERVICE & LOCKOUT LIGHTS

A properly installed heat pump requires only minor

maintenance, such as periodic cleaning of the ground water

heat exchanger (for heat pumps installed in ground-water

applications), the air filter, air coil and the condensate drain

pan. Setting up regular service checkups with your dealer is

recommended. Major problems with the heat pump system

operation will be indicated on the lockout lights.

CAUTION – During evacuation of refrigerant of a system

not having antifreeze protection of the water-side heat

exchanger, water in the unprotected heat exchanger must be

removed or continuously flowing to avoid a potential heat

exchanger failure caused by freeze rupture.

Important – Always install a new filter/dryer after

replacing a refrigeration component (compressor, etc.).

CAUTION – Servicing systems using R410A refrigerant

requires special consideration (Refer to ECONAR Instruction

10-2016 for more detail.). Always install a new filter/dryer

after replacing a refrigeration component (compressor, etc.)

and evacuate down to 150 microns.

A. Lockout Lights The heat pump controller and room thermostat will display a

system lockout. If lockout occurs, follow the procedure below:

1. Determine and record which indicator light on the

Controller is illuminated. (Refer to Section XIV for more

information on possible causes of Lockout Conditions.)

2. Check for a clean air filter, correct air-flow, and correct

water supply from the ground loop or ground water system.

3. Reset the system by disconnecting power at the circuit

breaker for one minute, and then reapplying power.

4. If shutdown reoccurs, call your ECONAR dealer. Do

not continuously reset the lockout condition or damage

may occur. Note – Improper fluid flow, incorrect

airflow, or incorrect antifreeze levels are the cause of

almost all lockouts.

B. Air Filter The AHU, or fossil fuel furnace, may include a disposable air

filter or a washable air filter. These filters must be serviced

monthly during normal usage, or more frequently during

extreme usage or if system performance has decreased.

A dirty filter will increase static pressure, and a variable speed

ECM blower motor will increase its speed to maintain airflow

levels. In extreme cases, the blower will not be able produce

the correct amount of airflow. These system changes will

cause the unit to consume more power than normal, reducing

the efficiency of the system. In the heating mode, reduced

airflow may increase the cost of operation and, in extreme

cases, cause system lockout due to high refrigerant pressures.

In the cooling mode, reduced airflow may reduce cooling

capacity and, in extreme cases, ice the air coil over causing

system shutdown due to low refrigerant pressures.

If a different filter is used in place of the factory-supplied

filter, it should also be cleaned or changed in a timely manner.

Be careful in selecting optional filters so that excessive

external resistance to airflow does not occur.

C. Preseason Inspection Before each season, the air coil, drain pan, and condensate

drain should be inspected and cleaned as follows:

Turn off the circuit breakers.

Remove the access panels.

Clean the air coil by vacuuming it with a soft-brush

attachment.

Remove any foreign matter from the drain pan.

Flush the pan and drain tube with clear water.

Replace the access panels and return power to the unit.

D. Ground Water Heat Exchanger Refer to Section VII.B.2 for details.

E. Thermostatic Expansion Valve Important – The TEV has an internal check valve to

control refrigerant in one direction and bypass refrigerant in

the opposite direction. A replacement TEV must be installed

correctly with the TEV Inlet orientated to the external

refrigerant liquid line.

20

XII. ROOM THERMOSTAT

OPERATION

Installations may include a wide variation of available

electronic room thermostats, and most of them require to be

configured by the Installer (according to the Installation Guide

included with the thermostat) and checked out after being

installed.

Important – At a minimum:

1. Ensure the thermostat is set up for the “System Type” it is

installed on.

2. Ensure the thermostat is configured for “Manual Heat/Cool

Changeover.”

3. Change other Installer Settings only if necessary.

4. Remember to press “Done” to save the settings and to exit

“Installer Setup.”

5. Run the system through all modes of operation in the

thermostat instructions to ensure correct operation.

If you have additional questions, please refer to the installation

manual that was sent with the thermostat.

XII. DESUPERHEATER (OPTIONAL)

An Enertech heat pump equipped with a double-wall vented

desuperheater can provide supplemental heating of a home’s

domestic hot water by stripping some energy from the

superheated gas leaving the compressor and transferring it to a

hot water tank. A desuperheater pump, manufactured into the

unit, circulates water from the domestic hot water tank, heats

it and returns it to the tank.

The desuperheater only provides supplemental heating when

the compressor is already running to heat or cool the

conditioned space. Because the desuperheater is using some

energy from the heat pump to heat water, the heat pump’s

capacity in the winter is about 10% less than a unit without a

desuperheater. During extremely cold weather, or if the heat

pump cannot keep up with heating the space, the

desuperheater fuse may be removed to get full heating

capacity out of the unit.

WARNING – Do not remove the desuperheater’s high

temperature cutout switch, or tank temperatures could become

dangerously high. The desuperheater's high temperature cutout

switch is located on the return line from the water heater and

is wired in series with the desuperheater pump to disable it

from circulating at entering water temperatures above 140oF.

If the tank temperatures become uncomfortably hot, move this

switch to the leaving water line, which will reduce the tank

maximum temperatures 10oF to 15

oF.

CAUTION – Running the desuperheater pump without

water flow will damage the pump. A fuse is attached to the

fuseholder and must be inserted in the fuseholder after the

desuperheater is purged and operational.

Important – Do not insert the fuse until water flow is

available and the desuperheater is completely purged of air, or

the pump may be damaged. Remove the fuse to disable the

pump if the desuperheater isn’t in operation.

All air must be purged from the desuperheater plumbing

before the pump is engaged. To purge small amounts of air

from the lines, loosen the desuperheater pump from its

housing by turning the brass collar. Let water drip out of the

housing until flow is established, and re-tighten the brass

collar. Using 1/2-inch copper tubing from the tank to the

desuperheater inlet is recommended to keep water velocities

high, avoiding air pockets at the pump inlet. An air vent in the

inlet line can also help systems where air is a problem. If one

is used (recommend Watts Regulator brand FV-4 or

Spirovent), mount it near the desuperheater inlet roughly 2-1/2

inches above the horizontal pipe. Shutoff valves allow access

to the desuperheater plumbing without draining the hot water

tank. Keep the valves open when the pump is running.

Desuperheater maintenance includes periodically opening the

drain on the hot water tank to remove deposits. If hard water,

scale, or buildup causes regular problems in hot water tanks in

your area, it may result in a loss of desuperheater

effectiveness. This may require periodic cleaning with Iron

Out or similar products.

CAUTION – Insulated copper tubing must be used to run

from the water tank to the desuperheater connections on the

side of the unit.

The built-in desuperheater pump can provide the proper flow

to the desuperheater if the total equivalent length of straight

pipe and connections is kept to a maximum of 90 feet of 1/2-

inch type L copper tubing (or a combination of approximately

60 feet with typical elbows and fittings). This tubing can be

connected to the water tank in two ways:

METHOD 1

Using a desuperheater tee installed in the drain at the bottom

of the water heater (See Figure 4). This is the preferred

method for ease of installation, comfort and efficiency. The

tee eliminates the need to tap into the domestic hot water lines

and eliminates household water supply temperature variations

that could occur from connecting to the hot water pipes. Poor

water quality may restrict the effectiveness of the

desuperheater tee by plugging it with scale or buildup from the

bottom of the tank, restricting water flow.

METHOD 2

Taking water from the bottom drain and returning it to the

cold water supply line (See Figure 5). This method maintains

the same comfort and efficiency levels but increases

installation time and cost.

Important – This method requires a check valve in the

return line to the cold water supply to prevent water from

flowing backwards through the desuperheater when the tank is

filling. Water passing through the pump backwards damages

the rotor's bearing, which reduces pump life and causes noise

problems in the pump. Note – A spring-type check valve with

a pressure-drop rating of 1/2 psig or less is recommended.

22

XIII. TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS

If the heat pump goes into lockout on a high or low pressure switch, the cause of the lockout can be narrowed down by knowing the

operating mode and which pressure switch the unit locked out on. The following table will help track down the problem once this

information is known. Note – A lockout condition is a result of the heat pump shutting itself off to protect itself, never bypass the

lockout circuit. Serious damage can be caused by the system operating without lockout protection.

INDICATOR LIGHTS

CONDITION PW

R

ASC LP HP COMMENTS

AC power applied Off Off Off Off Blown fuse or power removed or loose fuse clips.

AC power applied X X ASC indicator on for 4 minutes and 35 seconds after power initialization.

AC power applied X Power applied - unit running or waiting for a call to run.

Run cycle complete X X ASC indicator ON for 70 to 130 seconds after compressor shutdown.

LOW PRESSURE INDICATOR

Heating or Cooling –

before Y call

X X Flash -Check if Low Pressure switch is open.

-Check electrical connections between Low Pressure switch and Controller.

Heating - during Y call

X X X -Loss/lack of flow through ground-side heat exchanger.

-Low fluid temperature operation in ground-side heat exchanger.

-Freezing fluid in ground-side heat exchanger (lack of antifreeze).

-Dirty (fouled) ground-side heat exchanger (on ground water systems).

-Low ambient temperature at the heat pump.

-Undercharged / overcharged refrigerant circuit.

-Expansion valve / sensing bulb malfunction in compressor unit.

-Excessive low return air temperature.

Cooling - during Y call

X Cycle

On and

Off

every

few

min.

Blink -Freezing air coil (dirty air filter or air coil, undercharged refrigerant circuit)

-Missing blower compartment access panel.

-Loss/lack of airflow (dirty filter, closed vents, blower, restricted ductwork,

etc.)

-Low return air temperature.

-Low ambient temperature at the heat pump.

-Undercharged / overcharged refrigerant circuit.

-Expansion valve / sensing bulb malfunction in add-on unit.

-Excessively low fluid temperature in the ground side heat exchanger.

HIGH PRESSURE INDICATOR

Heating or Cooling –

before Y call

X X -Check if High Pressure switch is open.

-Check electrical connections between High Pressure switch and Controller.

Heating - during Y call

X X X -JS jumper was not removed on Dual Fuel add-on application.

-Loss/lack of airflow (dirty filter, closed vents, blower, restricted ductwork,

etc.)

-High return air temperatures.

-Overcharged refrigerant circuit.

-Expansion valve / sensing bulb malfunction in compressor unit

-Dirty (fouled) air coil.

Cooling – during Y call

X X X -Loss/lack of flow through the ground-side heat exchanger.

-High fluid temperature in the ground-side heat exchanger.

-Dirty (fouled) ground-side heat exchanger (on ground water systems).

-Overcharged refrigerant circuit.

-Expansion valve / sensing bulb malfunction in compressor unit.

XV. TROUBLESHOOTING GUIDE FOR UNIT OPERATION

PROBLEM POSSIBLE CAUSE CHECKS AND CORRECTIONS

Entire unit

does not run

Blown Fuse/Tripped Circuit

Breaker

Replace fuse or reset circuit breaker. (Check for correct size fuse or circuit breaker.)

Compressor out on Internal

Overload

Refrigerant line Service Valves not open or not fully open.

Blown Fuse on Controller Replace fuse on controller. (Check for correct size fuse.) Check for loose fuse clips.

Broken or Loose Wires Replace or tighten the wires.

Voltage Supply Low If voltage is below minimum voltage on data plate, contact local power company.

Low Voltage Circuit Check 24-volt transformer and fuse for burnout or voltage less than 18 volts.

Room Thermostat Set thermostat on “Cool” and lowest temperature setting, unit should run. Set

thermostat on “Heat” and highest temperature setting, unit should run. If unit does

not run in both cases, the room thermostat could be faulty or incorrectly wired. To

prove faulty or miswired thermostat, disconnect thermostat wires at the unit and

jumper between “R”, “Y” and “G” terminals and unit should run. Replace

thermostat only with correct heat pump thermostat. A substitute may not work

properly.

Interruptible Power Check incoming supply voltage.

Unit will not

operate on

“heating”

Dirty Furnace Air Filter Check filter on existing furnace. Clean or replace if found dirty.

Thermostat Improperly Set Is it below room temperature? Check the thermostat setting.

Defective Thermostat Check thermostat operation. Replace if found defective.

Incorrect Wiring Check for broken, loose, or incorrect wires.

Furnace Blower Motor Defective If it does not operate the compressor will go off on high head pressure.

Evaporator

(air coil) ices

over in

cooling mode

Dirty Furnace Air Filter or Air

Coil

Check filter. Clean or replace if found dirty. Clean air coil if found dirty.

Airflow Lack of adequate airflow or improper distribution of air. Check the furnace blower

motor speed and duct sizing. Check the furnace filter, it should be inspected every

month and changed if dirty. Check for closed registers. Remove or add resistance

accordingly.

Furnace blower Speed Set too

Low

Verify furnace blower speed is set a proper setting

Low Air Temperature Room temperatures below 65oF may ice over the evaporator.

Furnace

blower motor

runs but

compressor

does not, or

compressor

short cycles

Room Thermostat Check setting, calibration, and wiring.

Wiring Check for loose or broken wires at compressor, capacitor, or contactor.

Blown Fuse Replace fuse or reset circuit breaker. (Check for correct size fuse or circuit breaker.)

High or Low Pressure Controls The unit could be off on the high or low-pressure cutout control. Check water GPM,

air CFM and furnace filter, ambient temperature and loss of refrigerant. If the unit

still fails to run, check for faulty pressure controls individually. Replace if

defective.

Voltage Supply Low If voltage is below minimum voltage specified on the data plate, contact local

power company. Check voltage at compressor for possible open terminal.

Low Voltage Circuit Check transformer and fuse for burn out or voltage less that 18 volts. With a

voltmeter, check signal from thermostat at Y to X, M1 on controller to X, check for

24 volts across the compressor contactor. Replace component that does not

energize.

Compressor Overload Open In all cases an “internal” compressor overload is used. If the compressor motor is

too hot, the overload will not reset until the compressor cools down.

Compressor Motor Shorted to

Ground

Internal winding grounded to the compressor shell. Replace the compressor. If

compressor burnout, replace inline filter drier.

Compressor Windings Open Check continuity of the compressor windings with an ohmmeter. If the windings are

open, replace the compressor.

Seized Compressor Try an auxiliary capacitor in parallel with the run capacitor momentarily. If the

compressor still does not start, replace it.

24

PROBLEM POSSIBLE CAUSE CHECKS AND CORRECTIONS

Unit short

cycles

Room Thermostat Improperly located thermostat (e.g. near kitchen, inaccurately sensing the comfort

level in living areas). Verify Install Set-up configuration.

Wiring and Controls Loose wiring connections, or control contactor defective.

Compressor Overload Defective compressor overload, check and replace if necessary. If the compressor

runs too hot, it may be due to insufficient refrigerant charge.

Unit does not

cool (Heats

Only)

Reversing Valve does not Shift Defective solenoid valve will not energize. Replace solenoid coil.

Room Thermostat Ensure that it is properly configured according to their own instructions for the

“System Type” they are installed on.

Reversing Valve does not Shift,

the Valve is Stuck

The solenoid valve is de-energized due to miswiring at the unit or thermostat -

correct wiring. Replace if valve is tight or frozen and will not move. Switch from

heating to cooling a few times to loosen valve.

Insufficient

cooling or

heating

Water Lack of sufficient pressure, temperature and/or quantity of water.

Unit Undersized Recalculate heat gains or

Loss of Conditioned Air by Leaks Check for leaks in ductwork or introduction of ambient air through doors/windows

Room Thermostat Improperly located thermostat (e.g. near kitchen, not sensing the comfort level in

living areas). Verify Install Set-up configuration.

Airflow Lack of adequate airflow or improper distribution of air. Check the motor speed and

duct sizing. Check the filter, it should be inspected every month and cleaned if

dirty. Remove or add resistance accordingly.

Refrigerant Charge Low on refrigerant charge causing inefficient operation. Adjust only after checking

CFM,GPM, and inlet/outlet temperatures.

Compressor Check for defective compressor. If discharge pressure is too low and suction

pressure is too high, compressor is not pumping properly. Replace compressor.

Desuperheater The desuperheater circuit (in-line fuse) should be disconnected during cold weather

to allow full heating load to the house.

Reversing Valve Defective reversing valve creating bypass of refrigerant from discharge to suction

side of compressor. When it is necessary to replace the reversing valve, wrap it with

a wet cloth and direct the heat away. Excessive heat can damage the valve.

Water drips

from Add-On

unit

Unit not Level Level vertical units.

Condensate Drain Line Kinked or

Plugged

Clean condensate drain. Make sure external condensate drain is installed with

adequate drop and pitch.

Noisy

Operation

Compressor Make sure the compressor is not in direct contact with the base or sides of the

cabinet. Cold surroundings can cause liquid slugging, increase ambient temperature.

Contactor A “clattering” or “humming” noise in the contactor could be due to control voltage

less than 18 volts. Check for low supply voltage, low transformer output, or

transformer tap setting. If the contactor contacts are pitted or corroded or coil is

defective, repair or replace.

Rattles and Vibrations Check for loose screws, panels, or internal components. Tighten and secure. Copper

piping could be hitting the metal surfaces. Carefully readjust by bending slightly.

Check that hard plumbing is isolated from building structures.

Water and Airborne Noises Undersized ductwork will cause high airflow velocities and noisy operation.

Excessive water through the water-cooled heat exchanger will cause a squealing

sound. Check the water flow, ensuring adequate flow for good operation but

eliminating the noise.

Cavitating Pumps Purge air from ground loop system.

Squealing Sound from Inside the

Cabinet

Purge air from the water side of the desuperheater heat exchanger or defective

desuperheater heat exchanger.

XVI. TROUBLESHOOTING GUIDE FOR ECM BLOWER

PROBLEM CHECKS AND CORRECTIONS

Motor rocks slightly

when starting

•This is normal start-up for ECM.

Motor won’t start

•No movement

•Wait for completion of ramp-up at start.

•Check power at motor.

•Check low voltage (24 VAC R to X) at motor.

•Check low voltage connections (G, Y, W2, R, X) at motor.

•Check for unseated pins in connectors on motor harness.

•Test with a temporary jumper between R and G.

•Check motor for a tight shaft.

•Perform Moisture Check*.

Motor rocks, but won’t

start

•Check for loose or compliant motor mount.

•Make sure blower wheel is tight on shaft.

Motor starts, but runs

erratically

•Varies up and down

or intermittent

•Is ductwork attached?

•Check line voltage for variation or “sag”.

•Check low voltage connections (G, Y, W2, R, X) at motor, unseated pins in motor harness connectors.

•Check out system controls, thermostat.

•Perform Moisture Check*.

”Hunts” or “puffs” at

high CFM (speed)

•Does removing panel or filter reduce puffing?

Reduce restriction.

Stays at low CFM

despite call for higher

speed

•Check low voltage wires and connections.

•Verify fan is not in delay mode; wait until delay complete.

•”R” missing/not connected at motor.

Stays at high CFM •Verify fan is not in delay mode; wait until delay complete.

•”R” missing/not connected at motor.

Blower won’t change

CFM after adjusting

the speed control

setting.

•Power to the unit must be reset to enable the new settings.

•Verify fan is not in delay mode; wait until delay complete.

•”R” missing/not connected at motor.

Blower won’t shut off •Current leakage from controls into G, Y, or W?

Excessive noise •Determine if it’s air noise, cabinet, duct or motor noise.

Air noise •High static creating high blower speed?

- Does removing filter cause blower to slow down? Check filter.

- Use low-pressure drop filter.

Check/correct duct restrictions.

Noisy blower or

cabinet

•Check for loose blower housing, panels, etc.

•High static creating high blower speed?

- Check for air whistling through seams in ducts, cabinets, or panels.

Check for cabinet/duct deformation.

*Moisture Check

•Connectors are oriented as recommended by equipment manufacturer?

•Is condensate drain plugged?

•Check for low airflow (too much latent capacity)

•Check for undercharged conditions.

•Check and plug leaks in return ducts, cabinet.

**Comfort Check

•Check proper airflow settings.

•Low static pressure for low noise.

•Set low continuous-fan CFM.

•Thermostat in good location?

26

XVII. ADDITIONAL FIGURES, TABLES, AND APPENDICES

Figure 1 – Installation Illustrations (Note: Conceptual drawings only)

PumpPAK

Air Pad

Pressure/Temperature P/T Ports

25ft Line Set

7/8" Insulated

Vapor Line

3/8" Liquid

Line

Supply Duct

Return Duct

Installer provided

Air Filter and Air

Filter Rack

Condensate Drain –must be trapped and vented

Air

Handler

Unit

PumpPAK

Air Pad

Pressure/Temperature P/T Ports

25ft Line Set

7/8" Insulated

Vapor Line

3/8" Liquid

Line

Supply

DuctReturn

Duct

Installer provided Air Filter and Air Filter Rack

Condensate Drain – must be trapped and vented

PumpPAK

Air Pad

Pressure/Temperature P/T Ports

25ft Line Set

7/8" Insulated

Vapor Line

3/8" Liquid

Line

Return Duct

Condensate Drain –must be trapped and vented

Air Coil Unit

Fossil Fuel

Furnace

Figure 1a –

Vertical

Split System

Installation

Figure 1b –

Horizontal

Split System

Installation

Figure 1c –

Dual Fuel System

Installation

Pressure/TemperatureP/T Ports

IN

OUTTO/FROMGround Loop

PumpPAK

Figure 2 – Ground Loop Water Plumbing

Pressure/TemperatureP/T Ports

IN

OUT

BoilerDrains

Strainer

Flow ControlValve

SolenoidValve

Shutoff Valves

Discharge

FromBladder-TypePressure Tank

Visual Flow Meter

Figure 3 – Ground Water Plumbing

HOTCOLD

Drain (Hang Down)

Shutoff Valves

Air Vent

1/2" Copper Pipe

1/2" or 3/4"Copper Pipe

Desuperheater Tee

HOTCOLD

Drain (Hang Down)

Shutoff Valves

Air Vent

1/2" Copper Pipe

1/2" or 3/4"Copper Pipe

Check Valve

Note – Always use copper pipe. Check local codes and use

proper plumbing procedures.

Figure 4 – Preferred Desuperheater Installation

Note – Always use copper pipe. Check local codes and use

proper plumbing procedures.

Figure 5 – Alternate Desuperheater Installation

28

Wiring Diagram, Split System [EVxx-x-VS2x]

208V Yel

1-PhasePower

Blu

RedWHT

BLK

VR

BLK

Blu

BLURED

Vara 2 + Split System Electrical Diagram

80-0068

Rev _, 12/2010

PA

F1

SP

HP

DO

ASC

DT

PWR

X

R

X

O

G

X

M1

X

Compressor

Controller

J3

J1 J2

W2E R G O Y L XW2

Org

X

R

Blu

Red

Org

COMPRESSOR10VA Maximum

External Connected

Load (24Vac)

HP

BluBlu

Blk

Blu

LP / FP

LP/

FP

DO Dry Contact Output

F1 Fuse, Transformer

F2 Fuse, Desuperheater

FP Freeze Protection

HL High-Temp Limit

HP High-Press Switch

LP Low-Press Switch

M1 Contactor

PA Plug, Accessory

RS Relay, Desuperheater

SA Start Assist (Some

Single Phase Models)

SP Spare Fuse

Factory Low Voltage

Factory Line Voltage

VB Compressor Bypass

Valve (energize for Y2)

VR Valve, Reversing

J1 Remove for Hydronic

J2 Ties W2 to E

J3 Overflow Protection

JS Remove for Dual Fuel

Y E W2

HL

Desuperheater

Pump (Optional)

C S

R

To PumpPAK

(Optional)

SA

Run

Capacitor

M1

Blu

Yel

24V Transf

Blk

E R G O Y L CW2

Brn

E R G Y W C

E R G O Y Aux L C

Heat Pump Thermostat

Equipment

Ground

DY

O

R

X

Split System Controller

Blk

JS

Yel

R G Y W C

Supplemental

Heating System

E

See Note 1See Note 2

W

U1 U2 D1 D2Y2

Note 1 – DO NOT wire E to E on Dual Fuel.

Note 2 – Must remove JS on Dual Fuel applications. Must remain installed for Split System.

Note 3 – Utility Dual Fuel Radio (if used) normally closed (NC) contact replaces U1/U2 jumper link.

Note 4 – JL center position for Split System. Must be on Y position for Dual Fuel to latch W2 to Y.

See Note 3See Note 4

JL

Y Y2

Y2 Y2

COMPRESSOR

B

K

B

UR

D

L1 L3

L2

Three Phase

M1

Y2

VB

F2

Y2

RS

Blu

Wht

Blk

Blk

Field Line Voltage

Field Low Voltage

Notes

30

Greenville, IL & Mitchell, SD

info@enertechgeo.com

www.gogogeo.com

90-1094 Rev A (2011-008) | ©2012 Enertech Global, LLC. | All Rights Reserved