Data Sheet
Electric expansion valve
Type ETS 175L - 250L - 400L
For liquid injection into evaporators
ETS 175L - 250L - 400L is a series of electric expansion valves for precise liquid injection in to evaporators for air conditioning and refrigeration applications. The valve comes with two piston options, a linear and a S-shaped characteristics. The design is fully balanced, providing bi-flow feature as well as tight shutoff function in both flow directions. The valve design uses bi-polar drive providing very precise flow regulation.
ETS 175L - 250L - 400L valves are compatible with electronic control solutions from Danfoss and other manufacturers.
Features
• Precise positioning for optimal control of liquid injection.
• Wide range for all common refrigerants including A2L.
• ETS can be operated with flow in both directions.
• Balanced design allows to minimised the step loss.
• Designed with built-in sight glass with moisture indicator.
• Easy to service.
• Cable and connector assemblies as accessories.
• Danfoss EKE series, EKF series, MCX are examples of Danfoss controllers with drivers matching the ETS needs.
• For manual operation and service of ETS 175L - 250L - 400L valves an AST-g service driver is available.
AI374946650883en-000202
Electric expansion valve, Type ETS 175L - 250L - 400L
Portfolio overview
ETS 175L - 250L - 400L is an electric expansion valve series whose function is controlled though a Danfoss electronic controller, or a third party electronic controller that is compatible with the ETS 175L - 250L - 400L as to control functionality and connections.
Danfoss recommends the use of the EKE 1 series Superheat controllers or EKF driver units together with ETS 175L - 250L - 400L. With EKE1 series controllers a super heat accuracy better than 0.5K can be obtained.
The electronic controller requires precise temperature input from a temperature sensor (refrigerant temperature) and precise pressure inputs (evaporator pressure) from a pressure transmitter.
Table 1: System product
EKF 1A/2A Stepper Valve Driver |
EKE 1 series superheat controllers |
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(EKE 1B is shown) |
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EKF series is an economical stepper valve driver that translates analog signal |
EKE superheat controllers are for DIN rail mounting, and comes in three versions |
provided by master controller to valve driving sequence . |
with different combinations of inputs and output relays and different |
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functionality. |
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Table 2: Sensors and other products for ETS 175L - 250L - 400L
Figure 3: Pressure transmitter |
Figure 4: Temperature sensor |
Backup power module |
(DST P110 shown) |
(AKS 12 shown) |
EKE 2U |
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DST P110 is a digital ratiometric pressure transmitter. |
AKS is a PT1000 temperature sensor. Depending on |
EKE 2U Backup power module ensures suƒcient |
Depending on controller type, other ratiometric |
controller type, other temperature sensors can be |
power in case of power failures to the controller to |
pressure transmitters can be used as well (e.g. AKS |
used as well. |
ensure closure of the electronic valves |
32R). |
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© Danfoss | Climate Solutions | 2022.01 |
AI374946650883en-000202 | 2 |
Electric expansion valve, Type ETS 175L - 250L - 400L
Functions
Valve operation
The ETS 175L - 250L - 400L valves operate modulating by electronically controlled activation of the stepper motor. The motor is a type 2-phase bi-polar, which stays in position, unless power pulses from a driver initiate the two discrete sets of motor stator windings for rotation in either directions. The direction of the rotation of the spindle depends on the phase relationship of the power pulses. This is decisive for the travel of the piston.
The motor is operating the spindle, whose rotating movements are transformed into linear motion by the transmission in the cage assembly. The motor housing has a glass sealed M12 connection as standard, which can be connected with a M12 A code 4-pin connector.
The piston design inside the ETS 175L - 250L - 400L valve is pressure balanced, giving identical bi-flow performance capabilities and nearby identical maximum capacities. Closing the valve by overdriving, ensures that the reference number in steps is always correct.
NOTE:
Depending on the type of controller or driver, there will be limitations in cable length between valve actuator and driver. Both the actual cable length, the level of EMC emission on the location and driver circuit has an impact on the actual distortion of the current to the actuator motor.
Do not overdrive the valve in open position. Please contact Danfoss for further information how and when to apply this counter measure in cases with questionable cable length.
Sight glass and indicator
ETS 175L - 250L - 400L are equipped with sight glass with moisture indicator. The physical position of the valve can be checked through the sight glass.
Insuƒcient sub cooling can produce flash gas which is visible through the sight glass. The moisture indicator in the sight glass indicates dry or wet state of the refrigerant by changing its colour.
Some variants comes without sight-glass and indicator, check section ordering for details.
Electrical wiring
Figure 1: Electrical wiring
1 |
4 |
1 |
4 |
Coil I |
Coil II |
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Coil II |
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Coil I |
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3 |
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3 |
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2 |
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2 |
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ETS 175L / 250L |
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ETS 400L |
NOTE:
Electrical check of stepper motor and wiring coil I = 52 ohm, coil II = 52 ohm
© Danfoss | Climate Solutions | 2022.01 |
AI374946650883en-000202 | 3 |
Electric expansion valve, Type ETS 175L - 250L - 400L
Stepper motor switch sequence
Table 3: Stepper motor switch sequence
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Coil I |
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Coil II |
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1 |
2 |
3 |
4 |
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Opening |
1 |
+12V |
GRD |
+12V |
GRD |
Closing |
↓↓ |
2 |
GRD |
+12V |
+12V |
GRD |
↑↑ |
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3 |
GRD |
+12V |
GRD |
+12V |
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4 |
+12V |
GRD |
GRD |
+12V |
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If the controller driving the ETS 175L - 250L - 400L valves is from another manufacturer than Danfoss or a custom design,
the following points must be considered in order to overcome potential step loss.
1.To ensure total closing of the valve, the controller should have a function to overdrive the valve in the closed direction. It is recommended to overdrive 5% of the full step range at appropriate intervals. Overdrive should not be performed in open direction of the valve.
2.The amount of lost steps may increase as a function of the amount of changes of the opening degree. Such designed controller should be able to compensate the lost step after a de…ned number of changes in opening degree.
WARNING:
At power failure the ETS 175L - 250L - 400L valves will remain in the opening position it has at the moment of power failure, unless a safety device in the form of a battery backup is installed. Danfoss recommends to use EKE 2U backup power module.
Table 4: Design
ETS 175L - 250L - 400L with / without sight glass
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1 |
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2 |
1 |
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4 |
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4 |
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5 |
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6 |
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5 |
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7 |
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6 |
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8 |
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7 |
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9 |
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10 |
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8
10 9
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Normal flow direction |
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Normal flow direction |
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ETS 175L - 250L |
ETS 400L |
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Table 5: Design
Pos. no. |
ETS 175L - 250L - 400L |
1 |
M12 connector |
2 |
Glass seal |
3 |
Cover |
4 |
Stepper motor |
5 |
Bearing |
6 |
Spindle |
7 |
Valvehousing |
8 |
Piston |
9 |
Sight glass |
10 |
Cone |
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© Danfoss | Climate Solutions | 2022.01 |
AI374946650883en-000202 | 4 |
Electric expansion valve, Type ETS 175L - 250L - 400L
Applications
Figure 2: Applications
© Danfoss | Climate Solutions | 2022.01 |
AI374946650883en-000202 | 5 |
Electric expansion valve, Type ETS 175L - 250L - 400L
Media
ETS L series is designed to be used with the below shown refrigerants and lubricants.
Table 6: Refrigerants and lubricants
Media Data |
Value |
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R22, R134a, R404A, R407A, R407C, R407F, R407H, R422B, R422D, R438A, R410A, |
Refrigerants |
R417A, R422A, R438A, R442A, R448A, R449A, R449B, R450A, R452A, R463A, |
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R507A, R513A, R513B, R515A, R515B, R1234ze |
Refrigerant oil |
POE, PVE, mineral oil |
Oil free application |
No |
Media temperature range |
-40 °C to +70 °C |
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Refrigerant safety class (ASHRAE Standard 34/1S0 817)
NOTE:
For flammable refrigerants R1234ze :
•This product is validated in accordance to EN 378, ISO 5149, ASHRAE 15 or equivalent standards.
•Ignition risk is evaluated in accordance to ISO 5149.
•See safety note below.
NOTE:
•The product can be applied on systems with R1234ze as the working fluid.
•For countries where safety standards are not an indispensable part of the safety system Danfoss recommend the installer to get a third party approval of the system containing flammable refrigerant.
•Note, please follow speci…c selection criteria stated in the datasheet for these particular refrigerants.
•The valve must only be used in closed circuit refrigeration system, where no oxygen is present acc. EN 378, ISO 5149 ASHRAE 15 or equivalent standards.
© Danfoss | Climate Solutions | 2022.01 |
AI374946650883en-000202 | 6 |
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