Danfoss ETS 175L, ETS 250L, ETS 400L Data sheet

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-ow feature as well as tight shut-
o function in both ow directions. The valve
design uses bi-polar drive providing very
precise ow 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 ow 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

EKF 1A/2A Stepper Valve Driver

EKE 1 series superheat controllers

(EKE 1B is shown)

EKF series is an economical stepper valve driver that translates analog signal
provided by master controller to valve driving sequence .

EKE superheat controllers are for DIN rail mounting, and comes in three versions
with dierent combinations of inputs and output relays and dierent
functionality.

Figure 3: Pressure transmitter

(DST P110 shown)

Figure 4: Temperature sensor

(AKS 12 shown)

Backup power module

EKE 2U

DST P110 is a digital ratiometric pressure transmitter.
Depending on controller type, other ratiometric
pressure transmitters can be used as well (e.g. AKS
32R).

AKS is a PT1000 temperature sensor. Depending on
controller type, other temperature sensors can be
used as well.

EKE 2U Backup power module ensures sucient
power in case of power failures to the controller to
ensure closure of the electronic valves
.

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

Table 2: Sensors and other products for ETS 175L - 250L - 400L

© Danfoss | Climate Solutions | 2022.01 AI374946650883en-000202 | 2

Coil I

Coil II

1

2

3

4

ETS 175L / 250L ETS 400L

Coil II

3

4

Coil I

1

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-ow 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.

Insucient sub cooling can produce ash 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

 NOTE:

Electrical check of stepper motor and wiring coil I = 52 ohm, coil II = 52 ohm

© Danfoss | Climate Solutions | 2022.01 AI374946650883en-000202 | 3

Opening

↓↓

Coil I

Coil II

Closing

↑↑

123

4

1

+12V

GRD

+12V

GRD2GRD

+12V

+12V

GRD3GRD

+12V

GRD

+12V4+12V

GRD

GRD

+12V

ETS 175L - 250L - 400L with / without sight glass

1

2

3

4

5

6

7

8

9

10

Danfoss

80Z874

Normal flow direction

1

2

3

4

6

5

7

8

9

10

Normal flow direction

ETS 175L - 250L

ETS 400L

Pos. no.

ETS 175L - 250L - 400L

1

M12 connector

2

Glass seal

3

Cover4Stepper motor

5

Bearing

6

Spindle

7

Valvehousing

8

Piston9Sight glass

10

Cone

Electric expansion valve, Type ETS 175L - 250L - 400L

Stepper motor switch sequence

Table 3: Stepper motor switch sequence

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

Table 5: Design

© 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

Media Data

Value

Refrigerants

R22, R134a, R404A, R407A, R407C, R407F, R407H, R422B, R422D, R438A, R410A,
R417A, R422A, R438A, R442A, R448A, R449A, R449B, R450A, R452A, R463A,
R507A, R513A, R513B, R515A, R515B, R1234ze

Refrigerant oil

POE, PVE, mineral oil

Oil free application

No

Media temperature range

-40 °C to +70 °C

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

Refrigerant safety class (ASHRAE Standard 34/1S0 817)

 NOTE:

For ammable 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 uid.

• 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 ammable 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