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Electronic Expansion Valves and ControllersDanfoss Automatic Controls 9 October 2012 | 2

Danfoss Electronic Expansion Valve Product Range

ETS 6

ETS 12.5, ETS 25

ETS 50, ETS 100

ETS 250, ETS 400


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Section of refrigeration circuit

EKC 316A, 312EKD/EXD 316


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Refrigeration Circuit

-

System Components Overview

Controller Actuator Sensors

Examples

Temp Sensor Pt 1000 Ω

Type AKS11, AKS21, AKS21W, AKS10 etc

pressure transmitterAKS 32R, MBS1900 etc

AST

EIM 336 MCX

EKC 316A, 312, EKD 316


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Features Benefits Installers Wholesalers End users

Precise control

of liquid injection Energy saving Value selling Value selling Reduced running

costs

Optimized for part loads High flexibility Stockoptimization

Precise regulation –reduced runningcosts

Bi-flow operation and solenoid tightshut-off

Reversiblesystems

Save time (lesscomponents)

Stockoptimization

Wide range for all commonRefrigerants, HFC/ HCFC

Multi refrigerant Stockoptimization

Integrated sight glass with moistureindicator

(ETS 50/100/250/400)Refrigerantmonitoring

System safety Stockoptimization

Reduced componentcosts

Bi-metal connections

(ETS 50/100) Waterless

brazing

Save time Value selling Fast soldering

Corrosion resistant design High quality Improved life time

Low power consumption Improved energyefficiency

Value selling Value selling Energy saving

Features & BenefitsBack to General Content



Operation –

ETS

Electrical pulses controls the activationof the AST stepper motor.

The direction of the rotation of thespindle depends on the phaserelationship of the power pulses.

The rotation of the spindle istransformed into linear motion.

Stepper motor

Sealing

Spindle

Ball bearing

Gearing

A B

A

B

Flow A->B refers Normal Flow directionFlow B->A refers Reverse/Biflow Flow direction



ETS 250 cut-away

A B



Operation -

ETS 6

Electrical pulses change the polaritiesof the coil.

The coil rotates the magnet rotor ofthe valve in a stepwise fashion.

The valve has a screw structure andthe needle valve assembled with therotor moves linearly with the rotation.

ETS 6

A

B



Flow Characteristics

•Capacity is based on: R407C, to = 5°C, tc = 32°C, tl = 28°C

•Valve characteristics are optimized for part load conditions.


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Office buildings, Hotels, Breweries, Supermarkets, Dairy Industries, Cold storage Etc.

Chillers Systems



Inverter Mini Split

Modular Air-cooled Chillers

VRF, Multi Split IT Cooling

Bus/trailer Air Conditioning

Heat Pump Water HeaterETS 6



Application ETS 6: Residential A/C & Heat pumps

US residential A/CDomestic Heat PumpAsia Stylemulti split A/C

Heat pump unit

1.

Compressor.2.

Controller.

3.

Four-way valve.4.

Temperature sensor.5.

Pressure sensor.6.

Cartridge pressure control.7.

Evaporator.8.

Condenser.9.

Temperature sensor.10

.

Expansion device.11

.

Sight glass.

12

.

Liquid line filter drier.



Valve Selection

For easy andprecise selection ofvalves, use Danfoss’

CoolSelectorsoftware



Overview of Danfoss SH Controllers for Stepper Motor Valves

EKD/EXD 316EKC 316A EIM 316/336EKC 312

For chillers and general purpose Residential

applica-

tions, mini chillers

Display Option. EKA 164A MMIMyK setup tool

Adaptive superheat control (MSS)

Load-defined

SH control

Thermostat ctrl

Maximum Operateting Pressure (MOP)

Solenoid relay



Adaptive

Superheat Regulation

Regulation is here based on the

evaporator’s load by means of MSSsearch (MSS = lowest permissable

superheat).

With MSS search, the superheat

reference is lowered to the exact point

where instability sets in.

The superheat is limited by the settings

for min. and max. Superheat.

Adaptive superheat



Load-defined superheat regulation

The reference follows a defined curve.

This curve is defined by three values:the closing value,

the min.value

the max. value.

These three values must be selected insuch a way that the curve is situated

between the MSS curve and the curve

for average temperature difference

ΔTm (temperature difference between

media temperature and evaporator

temperature.

Setting example = 4, 6 and 10K.

Load-defined superheat

In addition to adaptive superheat, EKC 316A features Load-defined superheatcontrol as well.


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El t i E i V l d C t llD f A t ti C t l 9 O t b 2012 | 20

Danfoss can accept no responsibility for possible errors. Danfoss reserves the right to alter its products without notice. This applies to products already on order provided that suchalterations can be made without sub sequential changes being necessary in specifications already agreed. All trademarks in this material are the property of the respective companies.Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved. ©Danfoss A/S, Refrigeration and Air Conditioning Division.

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