oasys - aurora power & two stage cooling results in lower air temperature, less humidity than...

OASys Owner’S MAnuAl | www.oasysairconditioner.com | 800-537-2107

OASysTM

HYbRID Air Conditioner Owner’s Manualwith IDAC TECHNOLOGY

THere’S A CHAnGe In THe AIr ®

... And in your energy bill

SEER 40 PLUS

OASys Owner’S MAnuAl | www.oasysairconditioner.com | 800-537-2107 1

INTRODUCTION ...............................................................................2

WARRANTY REGISTRATION ......................................................3

GETTING STARTED ..........................................................................5

OPERATION ...........................................................................................6 Thermostat Operation ........................................................6 Operating Modes and Controls ........................................8 Operating Indicators ............................................................10 General use ...........................................................................11

HOW OASys WORKS ........................................................................12 Principal of Operation .........................................................12 water Consumption ............................................................12

MAINTENANCE AND SERVICE ..................................................13 General Troubleshooting .....................................................13 winterization .........................................................................13 requesting Service ...............................................................13

EXPLODED UNIT GRAPHIC ........................................................14INSTALLATION INSTRUCTIONS ..............................................15

INSTALLATION CHECKLIST .......................................................15

SAFETY ....................................................................................................15

PLANNING THE INSTALLATION Sizing .......................................................................................15 Selecting a location for the OASys ..................................15 Planning for Air Distribution ..............................................16 Service Connections ............................................................17 Controls ..................................................................................17 water Hardness ....................................................................17 Preparation for Mounting ...................................................18

UNPACKING AND INSPECTION Parts Included ........................................................................18

INSTALLATION Cabinet Installation ...............................................................18 Ducting ....................................................................................18 water Connections .............................................................18

OASys Service and Maintenance Drawings .............................19

TAble of COnTenTS


OASys COMPOnenTS at a glance

wArnInG – TO reDuCe THe rISK OF FIre, eleCTrIC SHOCK, Or InJurY TO PerSOnS, ObSerVe THe FOllOwInG:

A. Installation work and electrical wiring must be done by qualified person(s) in accordance with all

applicable codes and standards, including fire rated construction. b. when cutting or drilling into wall or ceiling, do not damage electrical wiring and other

hidden utilities. C. More than one disconnect switch may be required to de-energize the equipment for servicing.___________________________________________________________________________ul File e309793 Vol. 1 Sec. Gen. Issued: 2007-04-02

InTrODuCTIOn

The OASys is a highly efficient, environmentally benign, and low maintenance cooling system. because of the unique nature of the OASys compared to conventional refrigerant air conditioners, a thorough reading of this manual is highly recommended to assure that you benefit from its comfort and energy advantages.

“OASys” stands for Outdoor Air System. Instead of re-circulating indoor air OASys delivers 100% out-door air, filtered through a water saturated media. And instead of compressing a gas to achieve cool-ing, the OASys provides cooling by evaporating water using a unique two-stage process. The following features show why the OASys is an entirely new class of air conditioner:

• 80% reduction in energy consumption (EER 40+) • Two stage cooling results in lower air temperature, less humidity than single stage evaporative

coolers, and superior comfort • Variable speed operation is provided by a three speed motor. • Single blower and dual pump design means fewer moving parts, less maintenance, and lower

operating cost. • Intelligent controls enable the unit to precisely maintain water quality, reducing maintenance and

conserving water. • Easy access to all components simplifies maintenance and repairs.

To begin using your OASys immediately, read Getting Started. To fully understand how to operate OA-Sys, read the Operations section. To learn the principals of operation, refer to the sections General use and How OASys Works. To assure reliable, efficient operation of OASys for many years, refer to Main-tenance and Service.


OASys wArrAnTY reGISTrATIOn

Please return by mail to: attn: russ watersSpeakman CompanyP.O. box 191wilmington, De 19899-0191or

Go to www.oasysairconditioner.com/techinfo.html to download a fillable PDFand return by e-mail to: [email protected]

OASys Serial number _________________________________________________________

Customer name _____________________________________________________________

__________________________________________________________________________

Customer Address Street _______________________________________________________

City, State and ZIP Code _______________________________________________________

Phone Number (optional) _______________________________________________________

Email Address (optional) ________________________________________________________

Can we contact you to check on the status of your OASys? ❑ Yes/ ❑ no

would you like a free Speakman high performance eco Shower Head to reduce water consumption versus standard shower heads? ❑ Yes/ ❑ no

For OASys updates and additional products please see our website:www.oasysairconditoner.com


GeTTInG STArTeD

THESE INSTRUCTIONS will allow you to start using your OASys immediately. To fully understand how to benefit from its features, it is important that you read the Operation section.

• Insure power is connected. • Insure water supply is connected and turned on. • Your HVAC installer should check to make sure that the float arm is properly aligned to the indicated

sump water level. This float signals the solenoid inlet valve to introduce more water into the sump. If it has become misaligned in shipment it can cause the unit to introduce more water than is necessary. This water will not leak or cause damage since it goes out the overflow discharge but it is to a certain degree unnecessarily wasteful.

• Press On/Off button- power light will come on. • Use the Mode Key to select the Auto Cool mode. Display will show “AC”. Auto Cool mode instructs

the OASys to achieve the Set Temperature. note: as the OASys nears the Set Temperature the fan speed will decrease- this programming maximizes energy savings and prevents the unit from going on and off at high speed.

• The Display normally shows the Room Temperature. The Display changes to Set Temperature for 4 seconds if the arrows are used or if a signal is received from the remote transmitter. use set button arrows on the thermostat to select the desired Set Temperature or use the remote transmitter.

• The OASys will then commence operation and will automatically go through the following steps; Solenoid Valve will open and the sump will fill with water, after 4 minutes the circulation pump will turn on and the heat exchanger and direct media will wet out, after two minutes the fan will come on and the unit will begin to supply cool conditioned air. note: a total time of 6 minutes will elapse before cool conditioned air begins to circulate.

• If the cooler fails to operate as described in the Sequence of Operation section of this manual, refer to Maintenance and Service.

FOR MAXIMUM COMFORT and efficiency, always use the Auto Cool mode. Because OASys uses so little energy, setting the thermostat to maintain the temperature at 72-75° will assure that the house is comfortable during the hottest part of the day, while costing only pennies per day. Setting the thermostat lower during sleeping hours will also improve daytime comfort by precooling the “mass” of the house. Because cooler air is delivered during nighttime hours, nighttime cooling efficiency is very high.

THE OASYS INTRODUCES a continuous supply of fresh conditioned outdoor air. unlike conventional air conditioners which recycle stale indoor air the OASys must have an outlet to avoid pressurizing the house. Provide outlets where you want the conditioned air stream to flow. Outlets can be as simple as open windows or doors or can be consist of installed up-ducts to the attic. Cooling the attic will significantly reduce the heat load on the rest of the house. Often overlooked but quite effective outlets are fireplace dampers.

NOTE: When you first start up the OASys unit you may notice a slight odor. This odor results from the Celdek direct cooling media and is common to all sophisticated evaporative coolers that use this high quality material. The odor will disappear within a few hours of use. If the odor is problematic use the thermostat to fill and drain the sump several times to condition the direct media and the heat exchanger.

It is also possible to add a scent agent of your choice at any time either by spraying directly into the intake air stream or by adding a few drops to the sump water.


MODES • Modes are the types of actions the OASys can perform.

CONTROLS • Controls are the way the Modes are set or programmed.

INDICATORS • Indicators allow the OASys unit to tell the user what Modes and settings have been chosen.

GENERAL FEATURES OF THE THERMOSTAT

The Thermostat has following general features

• Set Point temperature range from 61ºF to 86ºF

• Timer setting in Hours (if selected from the Thermostat) or Hour/Minute (if selected from the Remote Control) to turn system on/off.

• Visual indication of the system operation indicated on Thermostat

• Various modes of operation explained below under the heading Modes of Operation

Please also refer to the diagram of the Controller and Thermostat shown in Figure 1

OPerATIOn

FIGURE 1. COnTrOller and THerMOSTAT



There are two types of OASys Modes: Operations Modes and Self-Maintenance Modes

OPERATIONS MODES ARE AS FOLLOWS: • Fan Only • Manual Cool • Auto Cool

FAN ONLY: • Only Fan motor works • High, Medium or Low Fan speed can be selected with the transmitter or Fan Speed key.

Display will indicate F1, F2 or F3 depending on the speed selected, with F1 indicating lowest and F3 highest fan speed.

MANUAL COOL: • Fan speed can be changed to Low, Medium or High • Circulation Pump can be switched On/Off • Dump Pump can be Switched On/Off

AUTO COOL MODE: • The OASys selects a fan speed depending on the differential between Room Temp and Set Temp.

use the Mode button to select AC. Then use the Fan button to select a constant fan speed (F1, F2 or F3) or select FA to instruct the unit to choose the optimal fan speed to reach set temperature.

• In FA as the Room Temp goes above the Set temp startup sequence will be a. Solenoid Valve will Open b. 4 minutes later Circulation Pump turns on c. 2 minutes later the Fan Motor starts • Low, Medium, High or Auto Fan (FA) Speed can be selected. • Fan Speed change takes place only if Circulation Pump is On • In FA setting the OASys unit will select the optimal fan speed according to the following pro-

gramming:

IN CONDITIONS IN WHICH THE ROOM TEMPERATURE IS INCREASING: room temp Fan Speed Set temp low Set Temp+ 2ºF Medium Set Temp+4ºF High

IN CONDITIONS IN WHICH THE ROOM TEMPERATURE IS DECREASING: room Temp. Fan Speed Set Temp+4ºF High Set temp +2ºF Med Set Temp low

• If the Room Temperature falls 2ºF below the Set Temp:Circulation Pump will turn Off and the OASys will go into Dry Out cycle- the fan will run at low speed for 4 minutes to dry out the Direct/Indirect Media before going in to the Standby State.

OASys MODeS


OASys MODeS continued

SLEEP MODE: • Sleep Mode is selectable in Auto Cool Mode only. Sleep LED glows to indicate the Sleep Mode

selection. In this mode Set temperature will increase 1ºF every hour up to 2 Hrs.

OASYS SELF-MAINTENANCE MODES

PURGE CYCLE MODE: • This mode is automatic but can be programmed. • If the OASys has not started for 4 hours the Dump Pump will come on for 4 minutes which will

empty out the sump to prevent biological growth. • The 4 hour automatic setting can be changed in steps of 2 hours from 2-12 hours. • When this Purge Cycle starts the inlet valve will close and remain closed till the OASys is re-

started to provide cooling. • To Adjust the Timing of the Clean Mode: 1. Press the Program Key on the Thermostat once. 2. Display will show P1. Adjust the time by UP/Down Keys 3. Time Period between 2 hours and 12 hours can be selected for Purge Cycle.

DRY OUT CYCLE:• When the Set Temperature is achieved the Circulation Pump will stop while the fan will continue to run for four minutes at medium speed. This will dry out both the indirect and direct media and will prevent bacteriological growth.

CLEAN OUT CYCLE: • Periodically the OASys will refresh the circulation water to prevent the build-up of hardness

minerals that can degrade the effectiveness of the evaporative media. • During this mode the Dump Pump will automatically empty the unit while the Fill Valve is open

and the Circulation Pump is on. This will “wash” the evaporative media and will purge accumu-lated dirt and minerals.

• This mode will last for 4 minutes. • The period when this mode turns on can be programmed. • Please consult your HVAC contractor to determine the optimal Clean Out frequency. The more

often the unit goes into the Clean Out Cycle the longer the Indirect and Direct media will last before they require replacement. However, frequent Clean Out Cycle use will consume more water. The highest setting is only required in areas that have high mineralization of the water supply.


COnTrOlS

The OASys can be controlled using either the Keys on the Thermostat or the optional Infrared remote Control:

THERMOSTAT CONTROLS. A beep sound is heard when any key is pressed.

• POwer: Switch the OASys on or off. • uP: Increases the Set Temperature. Also used to adjust the Timer. • DOwn: Decreases the Set Temperature. Also used to adjust the Timer. • MODe: Changes the mode to Fan Only, Manual Cool or Auto Cool. • FAn: This key changes the Fan speed to High, Medium or low. • TIMer: This key selects the Timer. Up/Down keys are used to adjust the Timer value. • SleeP: This key selects or de-selects the Sleep Function. • PuMP: To switch On/Off the Circulation Pump in Manual Mode. • DuMP: To Switch On/Off the Dump Pump in Manual Mode. • PrOGrAM: To Adjust the time for the Purge Cycle- will show S1 (2-12Hrs.)

InDICATOrSThere are two types of Indicators on the OASys, leD Indicators and the Display.

LED INDICATORSThere are 6 leD lights on the Thermostat to indicate the following:

• AuTO COOl: To indicate the Auto Cool mode selection. • SleeP: To indicate the Sleep mode selection • TIMer: To indicate the timer selection • PuMP: To indicate that the water Circulation Pump is On • FIll: To indicate that the OASys fill valve is working • POwer: To indicate that 120 volt AC power is reaching the OASys unit

DISPLAY: • The Display normally shows the Room Temp up to 99 degrees Fahrenheit • The display changes to Set Temperature for 4 seconds if any signal is received from the Receiver

or from the remote Controller. • Shows the modes “Fn” (Fan),“CL” (Cool) or “AC” (Auto Cool), if the mode key on receiver

board is pressed. • Shows the fan Speed “F1” (Low), “F2” (High) , “F3” ( High) or “FA” (Fan Auto) if the fan key on

receiver is pressed. • Timer value in Hrs (e.g. 01, 02) will be displayed when timer is set by the TIMER key on receiver

board. • During any operation from the LCD transmitter, Display will show the set Temp as is displayed

on the lCD screen of Transmitter. • In Standby State Display shows “OF”. • Display blinks (After 250 Hrs) to indicate that Biocides needs to be replenished


GenerAl uSe

OASYS RUNS MOST EFFICIENTLY and provides superior cooling when allowed to run for prolonged periods of time, using the automatic speed control capability of the Auto Cool mode. Short periods of operation result in incomplete wetting of the media and lower cooling efficiency. Therefore, Manual Cool and Fan Only modes should only be used for the reasons listed in Table 1. Fan Only mode does not filter air as effectively as the other two modes.

Table 1: recommended Operation

OPERATING MODE WHEN TO USE AuTO COOl All normal cooling use MAnuAl COOl Only when a constant fan speed is desirable FAn OnlY when ventilation is needed on mild or cool days

AIR RELIEF. OASys pressurizes your house with cool air. If there is no escape route for the air, no cooling can take place. If your house is equipped with ceiling-mounted relief vents with dampers, the distribution of cooling among the rooms can be controlled by setting the damper position of the ceiling vents. Air vented from the house will cool the attic and contribute to keeping the house cool. If you have no ceiling-mounted vents, it will be necessary to open windows whenever the OASys is running. Open the windows widest in rooms which need the most cooling. If your system uses a single supply air grille (as opposed to air supply grilles in each room) it will be necessary to open all doors to the rooms requiring cooling to provide an air flow path from the air supply grille through the rooms and to the at-tic or exterior.

IF YOU ARE LOCATED in a climate which frequently experiences freezing temperatures and the OASys is installed in an outdoor location, it is recommended that you disconnect and drain the water supply line to avoid freeze damage to the line. If power to the OASys is to be disconnected for the win-ter, drain the reservoir before shutting off the power, and cover the top vent to keep out rainwater and debris. The OASys will drain itself automatically as described in the Operation Modes section. If power is left on through the winter the unit will automatically discharge any collected rainwater, but covering the top is still recommended to keep the inside of the unit clean.

POWER FAILURES. In the event of a power failure or power interruption the OASys will revert to Auto Cool mode when power is restored. If there is water in the reservoir, the unit will enter a purge cycle before resuming operation. To avoid simultaneous heating and cooling resulting from winter power failures, the temperature set-point should be set high throughout the winter.


HOw OASys wOrKS

PRINCIPAL OF OPERATIONYour OASys uses the natural evaporation of water to provide cooling in a two-stage process that pro-duces lower air temperatures with less humidity than direct evaporative coolers. The “indirect cooling media” (ICM) provides the first cooling stage. The ICM is a heat exchanger which cools the air without adding moisture. The precooled air then passes through a high efficiency direct cooling media (DCM) where it is further cooled.

ELECTRICALLY OPERATED “fill” and “drain” valves maintain water quality. A float switch in the reservoir both maintains the proper water level and measures the rate of water replacement. A com-puterized control integrates the operation of the blower, valves, and pump, and maintains the correct blower speed.Self Cleaning Features and water Quality Maintenancewhen a precisely measured quantity of water has been evaporated, the cooler automatically empties its reservoir, discharging concentrated minerals from the water and particles washed from the air. The reservoir then refills with fresh water. During this cleaning (or “purge”) cycle, which lasts 4 minutes, the fan continues to operate at a reduced speed so that cooling is not interrupted.

THE FREqUENCY of the purge cycle can be adjusted. For example, in areas with very hard water the controls are set to prevent more than a doubling of the concentration of dissolved solids, or two “cycles of concentration”. Information on setting the purge cycle is provided in the installation section of this manual.

IF THE UNIT HAS NOT bEEN OPERATED for more than 4 hours the reservoir will automati-

cally drain. This feature, unique to OASys, prevents growth of harmful bacteria and eliminates odors by not allowing water to stagnate.

WATER CONSUMPTIONwater use varies greatly depending on how much you operate the unit, water quality, and weather conditions. water consumption may be as little as 4 gallons per day and as much as 20 gallons per day. because water quality is closely maintained, water discharged from the reservoir may be used for land-scape watering.


MAInTenAnCe and SerVICe

It is recommended that you arrange with your installer for an annual maintenance and service inspection.

GENERAL TROUbLESHOOTING

ODORS The DCM cellulose material is treated with binders during manufacturing which emit odors during the first few days of operation. The odors will gradually dissipate and should not be noticeable after one week of regular use. You may use the thermostat mode button to flush the reservoir with fresh water to more quickly eliminate the odors.

bUbbLES AND WATER CARRYOVERThe same binders that cause odors can cause bubbles to form on the surface of the DCM. The bubbles may carry water droplets into the supply air outlet, especially when the fan is running at high speed. Frequently flushing the reservoir during the first week of operation should also cure this problem; if it persists, contact your dealer.

MOLD CONCERNS As with all HVAC equipment there is always the consideration of mold growth. Mold growth is a real concern in single stage evaporative “swamp coolers”. The OASys unit has been designed with several features that will prevent mold growth. If properly installed and maintained there should be no mold growth in the OASys unit. As part of the annual service and maintenance of the unit a visual inspection should be made to ensure that these features are working properly and that mold is not present in the unit. 1. The Dump Cycle prevents the build-up of dirty water. 2. The Dry Out Cycle avoids the moist environment conducive to mold growth. 3. A biocide additive is available and should be used if the OASys is installed in a climate area that

experiences periods of relatively high humidity.

WINTERIzATIONIf you live in an area subject to freezing temperatures, at the end of the cooling season turn off water supply to the unit and ensure that the supply connection is drained and that the unit is dry. It is advis-able to cover the unit to prevent infiltration of cold outdoor air.

REqUESTING SERVICEIf you have difficulty contacting your installing contractor or service representative, please e-mail Speakman CrS at [email protected] or see our website www.oasysairconditioner.com


exPlODeD GrAPH unIT


InSTAllATIOn InSTruCTIOnS

INSTALLATION CHECKLIST • If you have never installed an OASys before, read this manual from cover-to-cover • Determine a suitable location for the OASys, observing clearance requirements • Select air supply and relief locations • Select thermostat location (not directly in the supply air stream) • Correctly size all ducting and registers • Provide for water service, drain, and electrical service • Obtain all materials required for the installation • Install the OASys in accordance with this manual and all applicable building codes • Set controls for correct purge cycle frequency • Clear pump inlet and inlet screen of any debris • Verify proper system operation • Instruct the owner on use of the system and provide them with this manual

SAFETYThe following precautions should be taken to avoid shock hazard when installing or servicing this unit:

• ALWAYS DISCONNECT POwer wHen MAKInG eleCTrICAl COnneCTIOnS Or Ser-VICInG THe unIT. removal of the control board while the unit is connected to power will result in permanent damage to the board and exposure to shock hazard.

• In the event of water spillage inside the unit, disconnect power and allow all electrical compo-nents to dry prior to restoring power.

• Observe wiring and grounding requirements as indicated in these instructions and the electric code.

PLANNING THE INSTALLATION

SIzINGTwo to three ton capacity depending on climate.Selecting a location for the OASysThe following information will help in selecting a location for the OASys:

• The OASys may be mounted on an outside pad, a roof or bracketed to a wall. The OASys can be placed in a garage with adequate drainage in case of overflow or leaks. Indoor installation such as in an attic or utility closet is possible but not recommended. If the unit is not properly installed leaking can occur which could seriously damage the interior of a home. A drain pan should always be used in such an installation in case of condensation or other leaks. Interior installation may nullify certain parts of the warranty and or service agreements.

• The OASys requires a dedicated 115V circuit, cold water supply, and a location to discharge drain water in accordance with local codes.

• A supply air connection to the house, an outside air intake, and a “secondary” air outlet must be provided (see Fig. 1). Secondary air should be discharged to the outside, and may be discharged into an attic or space vented to the outside.

• Do not install the unit such that the air intake is 10 feet or less from an appliance vent outlet,


InSTAllATIOn InSTruCTIOnS continued

exhaust fan discharge, plumbing drainage system vent, chimney outlet, or other source of con-taminated air unless the outlet is more than 3’ above the cooler intake.

• For non-ducted systems, locate the unit so that it discharges air into common spaces such as living rooms or hallways, but not so that it will create substantial drafts in seating areas. The air supply should be at least 5’ above the floor.

• For ducted systems, duct connections should be as short as possible. Be sure to allow adequate space for duct connections (see below).

• All systems require an air relief path, either into the attic through barometric dampers, or to the exterior. Plan the installation so that air can travel freely from the OASys to the discharge open-ings.

• The unit must be fully accessible for service (see clearance requirements, Fig 4.)

PLANNING FOR AIR DISTRIbUTION

UNLIKE REFRIGERANT-bASED AIR CONDITIONERS, which use multiple supply air outlets to distribute cooling and one return air inlet, OASys systems can be installed with one or two supply air inlets. Multiple “relief” locations distribute air to the various rooms. In many cases, supply air ducting can be eliminated. The OASys is most easily installed on exterior walls with air supplied through a single grille, but ducting may be used to distribute air if guidelines in this manual are followed. Improper duct sizing will cause a reduction of air flow and cooling capacity.

SUPPLY AND INTAKE PLENUMS: Supply and intake plenums must be sized so that the air ve-locity of any passage, including grilles, does not exceed 800 feet per minute (maximum velocity = 1766 divided by the air passage cross sectional area in ft²).

INTAKE AIR DUCTING: Intake air ducting methods depend on the type of installation. wall mount and exterior mount systems require no ducting. units mounted in interior spaces or attics require ducted intake air. To facilitate round duct connections, plenum should be at least 16” high. Do not cut openings in the cabinet in any other locations.

SUPPLY AIR DUCTING: Size ducting for a maximum pressure drop of 0.25” static pressure. Mini-mize the amount of ducting, relying on relief vents for air distribution. If sharing ducting with a furnace and/or refrigerant air conditioner, insure ducts are properly sized and install back draft dampers at both OASys and furnace supply plenums. back draft dampers must be accessible for inspection.

DUCTING SECONDARY AIR: If necessary to isolate secondary air discharged from the back rear of the unit from the intake, a duct connection may be made to the back rear of the unit. Discharging this air to the outside is preferable.

AIR RELIEF: For proper cooling operation, air must be discharged from the house at the same rate it is supplied by the OASys. The preferred method is to vent air into the attic through ceiling-mounted grilles with barometric dampers. by venting air into the attic the attic is kept cooler, reducing ceiling heat gain. Damper assemblies, or “up-Dux”, are available as accessory equipment. At least four 12” x 12” reliefs should be installed per OASys unit. Air may also be discharged through wall-mounted damp-ers, operable skylights, or secured windows.



SERVICE CONNECTIONSelectrical: Provide a 15 amp service and disconnect near the unit in accordance with local codes. wir-ing to the unit is made through a right side knockout. Use of flexible liquid-tight conduit is recommend-ed.

WATER SUPPLY: Provide a 1/2” or larger nominal pipe size water supply within 10’ of the unit, ca-pable of delivering at least 2 gallons per minute of clean water at 20 psi minimum pressure. Connect to the 3/8” FPT inlet water fitting on the left side of the cabinet using 3/8” copper tube. A saddle fitting with shutoff valve may be used to adapt from the 1/2” pipe to a 3/8” compression fitting. Provide a filter if water contains sand or sediment.

DRAIN: If it is undesirable to discharge water at the unit, provide a suitable drain. The drain may be discharged into a landscaped area, storm drain, or sanitary waste (indirect drain). Refer to local codes for indirect drain requirements. Discharge water will not harm plants and may be used for irrigation. The volume of water discharged ranges from about 4 to 20 gal. per day, depending upon local water quality and outdoor conditions.

CONTROLSIdentify the thermostat location and determine the length of control wire required. A 15’ length of con-trol wire with rJ-45 modular connectors pre-attached is supplied with each unit. If the required length is greater than 15 feet, additional wire and connectors may be purchased from your dealer. refer to the wiring and Controls Installation section for additional information.

WATER HARDNESSThe OASys keeps its water clean and low in mineral content by periodically emptying, or “purging” the reservoir. The more rapidly water evaporates, the more frequently the reservoir is purged.

TO PROPERLY CONFIGURE THE CONTROL to maintain the correct mineral concentration in the reservoir, it is necessary to estimate the hardness of the local water supply. If minerals in the water are allowed to become too concentrated, deposits will build up on the media, affecting performance, shortening media life, and increasing maintenance. water will be wasted if water purge cycles occur too frequently. Contact your water utility to determine the Total Hardness and Total Alkalinity. use the hardness rating from Table 9 to determine control settings as described in Setup and Testing. For more detailed information on water maintenance refer to Munters Engineering Bulletin EB-WTM-502 (to request call 800-446-6868).

TAbLE 9: Hardness rating

TOTAL HARDNESS TOTAL ALKALINITY (parts per million) (parts per million) HARDNESS RATING less than 100 less than 60 low 100-140 60-80 Moderate 140-180 80-120 Moderate-High Greater than 180 Greater than 120 High



PREPARATION FOR MOUNTINGPreparation for mounting the OASys will vary with each installation type. refer to application informa-tion for the specific type of installation (Wall, Rooftop, or Pad). Be sure to install a drain pan under the unit if installing in an area subject to water damage. To avoid water spillage during operation, the unit must be installed on a dead-level surface or plenum, or mounted to a “plumb” wall.

UNPACKING AND INSPECTIONParts IncludedParts shipped with the standard OASys unit include the cabinet with blower, media assembly, and con-troller; thermostat, and thermostat wire (with modular connectors pre-installed). Optional parts include ceiling and/or wall dampers, wall mount duct, and intake air plenum

The blower Assembly includes the blower housing, and motor. The Ge motor incorporates electronic components which should not be exposed to moisture.

The Media Assembly is composed of the plastic indirect media, Celdek cellulose media, water distribu-tion system, and shroud.

The Cabinet encloses the blower and media assembly, and supports the circulating pump, fill valve, and drain pump. The control box, which contains the control board, is mounted inside the cabinet behind the upper access panel. Power connections are made in the lower partitioned area of this box.

INSTALLATION

CAbINET INSTALLATIONregardless of mounting location, the cabinet must be installed “plumb”. water leakage may occur if the unit is installed at an angle. Important: recommended installation is outside on a pad or rooftop mount. It is not recommended to install the OASys in an attic.

On outdoor installations performance may be improved if installation is out of direct sun light or insula-tion is used to block the sun from the cabinet and ducting.

DUCTINGFirst, you should determine if you are installing a CrS 1000 or CrS 1100 unit. both units are essentially identical but have different UL ratings. The CRS 1000 unit is “UL Classified” as a ducted unit. The CRS 1100 is “ul listed” as a room unit. If you are installing a CrS 1100 unit a short duct run to a single room can be used.

Install ducting in accordance with applicable codes, and applications information provided by your dealer. Ducts should be sized using ACCA Manual D or other methods for a maximum total pressure drop of 0.25” external static pressure. Avoid use of fiberglass board or fiberglass duct lining. If ducts are to be lined for sound attenuation or prevention of heat gain, use AP Armaflex SA duct lining or an equivalent product. Tightly sealed and insulated ducts will insure that the OASys delivers its full cooling capacity.

WATER CONNECTIONSConnections are ¾ “ garden hose fittings.


OASys SerVICInG and MAInTenAnCe DrAwInGS


OASys SerVICInG and MAInTenAnCe DrAwInGS continued



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oasys - aurora power & two stage cooling results in lower air temperature, less humidity than...

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