Danfoss ETS 400, ETS 250, ETS 100, ETS 50, ETS 12.5 Data sheet

Data sheet

Electric expansion valve

Type ETS 12.5 - ETS 400

ETS is a series of electric expansion valves for
precise liquid injection in evaporators for air
conditioning and refrigeration applications.

The valve piston and linear positioning design is
fully balanced, providing bi-flow feature as well
as solenoid tight shut-off function in both flow
directions.

The valve design uses bi-polar drive providing
very precise flow regulation.

ETS 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.

• ETS 250, ETS 400 provides 34 bar / 493 psig.

• All ETS can be operated with flow in both
directions and are solenoid tight.

• ETS 50 to ETS 400 have a balanced design.

• ETS 50 and ETS 100 feature improved process
and productivity due to waterless brazing i.e
soldering without wet cloth for cooling.

• Special ETS 250 and ETS 400 available for oil
free applications.

• ETS 50 – ETS 400 are all designed with built-in
sight glass with moisture indicator.

• Internal and external corrosion resistant
design.

• Low power consumption.

• Cable and connector assemblies as
accessories.

• Danfoss EKE 1A, EKE 1B, EKE 1C, MCX061V,
MCX152V are examples of Danfoss controllers
with drivers matching the ETS needs.

• For manual operation and service of ETS valves
an AST-g service driver is available.

© Danfoss | DCS (rm) | 2019.02

DKRCC.PD.VD1.3C.02 | 1

Data sheet | Electric expansion valve, type ETS 12.5 – ETS 400

Approvals

Approvals

089

Technical data

NOTE:

Technical data also applicable for ETS 250
and ETS 400 oil free version.

Electrical data

Wide range for all common refrigerants R1234ze, R134A, R22, R404A, R407A, R407C,
R407F, R410A, R422B, R422D, R438A, R448A, R449A, R450A, R452A, R507, R513A and other

Compatible refrigerants

Refrigerant oil All mineral oils and ester oils and special ETS 250 and ETS 400 support oil free applications

Comply with P.E.D. Yes

Max. opening pressure
differential (MOPD) normal flow

Max. opening pressure
differential (MOPD) reverse flow

Max. working pressure (PS/MWP)

Inlet fluid temperature -40 °C – 65 °C (-40 °F – 149 °F). For higher temperature valve, please contact Danfoss.

Ambient temperature -40 °C – 60 °C (-40 °F – 140 °F)

Material of Construction

Motor enclosure IP67

Stepper motor type Bi-polar - permanent magnet.

Step mode 2 phase full step.

Phase resistance 52 Ω ±10%

Phase inductance 85 mH

Step angle

Nominal voltage

Phase current Using chopper drive: 100 mA RMS -4% – 15%

Holding current

Max. total power Voltage / current drive: 5.5 / 1.3 W (UL: NEC class 2)

Step rate

Total steps

Full travel time

Lifting height

Reference position Overdriving against the full close position

Electrical connection M12 connector

refrigerants.
Special valves for R744 (CO2) are available.
For other refrigerants, please contact your local Danfoss representative.

33 bar (478.6 psi)

ETS 12.5, ETS 25, ETS 50, ETS 100: 33 bar (478.6 psi)
ETS 250, ETS 400: 10 bar (145 psi)

ETS 12.5, ETS 25, ETS 50, ETS 100: 45.5 bar (660 psig)
ETS 250, ETS 400: 34 bar (493 psig)

ETS 50, ETS 100: Body and AST enclosure in brass, connections in bi-metal
(stainless steel/copper).
ETS 12.5, ETS 25, ETS 250, ETS 400: Body and AST enclosure in brass, connections in copper.

7.5° (motor),

0.9° (lead screw),
Gearing ration 8.5:1. (38/13)2:1

Constant voltage drive: 12 V dc -4% – 15%,
150 steps/sec.

Constant voltage drive: Depends on application.
Chopper drive: full current allowed (100% duty cycle)

Constant voltage drive: 150 steps/sec.
Chopper current drive: 0 – 300 steps/sec. 300 recommended

ETS 12.5, ETS 25, ETS 50: 2625 [160 / -0] steps
ETS 100: 3530 [160 / -0] steps
ETS 250, ETS 400: 3810 [160 / -0] steps

ETS 12.5, ETS 25, ETS 50: 17 / 8.5 sec. (voltage / current)
ETS 100: 23 / 11.5 sec. (voltage / current)
ETS 250, ETS 400: 25.4 / 12.7 sec. (voltage / current)

ETS 12.5, ETS 25, ETS 50: 13 mm (0.5 in.)
ETS 100: 16 mm (0.6 in.)
ETS 250, ETS 400: 17.2 mm (0.7 in.)

© Danfoss | DCS (rm) | 2019.02

Compatible Danfoss controllers Danfoss EKE 1A, EKE 1B, EKE 1C, MCX061V, MCX152V and more

NOTE:

Full life time of standard ETS can only be ensured if oil is present in the system.
Oil free applications: Special ETS 250 and ETS 400 are available for higher capacity and use ETS Colibri for smaller capacity.

DKRCC.PD.VD1.3C.02 | 2

A

A

A

Data sheet | Electric expansion valve, type ETS 12.5 – ETS 400

Design

Note:

Flow direction from A to B
refers to the normal flow

Danfoss

34G45.12.10

1. M12 connection

2. Glass seal

3. AST motor housing

4. Stepper motor

5. Bearing

6. Spindle

7. Cone and lead nut

8. Valve seat

1. M12 connector

2. Glass seal

3. AST motor housing

4. Stepper motor

5. Bearing

6. Spindle

7. Top Nut

8. Valve piston

9. Valve seat

10. Valve cone

ETS 12.5, ETS 25 - straight

ETS 50 & 100

B

B

ETS 12.5, ETS 25 - angleway

1
2

3

4

5

6

7

8

9

10

.10

B

1. M12 connector

2. Glass seal

3. AST motor housing

4. Stepper motor

5. Bearing

6. Spindle

7. Top Nut

8. Valve piston

A

B

9. Sight glass with indicator

10. Valve seat

11. Valve cone

© Danfoss | DCS (rm) | 2019.02

ETS 250 & 400

DKRCC.PD.VD1.3C.02 | 3

Data sheet | Electric expansion valve, type ETS 12.5 – ETS 400

Sight glass and indicator

Electrical wiring

ETS 50, ETS 100, ETS 250 and ETS 400 are
equipped with sight glass with moisture
indicator. The physical position of the piston in
the valve can be checked through the sight glass.
It also helps to determine the flow direction of

Insufficient 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.
the refrigerant in the system (ETS 50 and
ETS 100).

Danfoss

34G212.10

Note:

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

Stepper motor
switch sequence

Coil I Coil II

Red Green White Black

↑ CLOSING ↑

STEP

1 + - + ­2 + - - +
3 - + - +
4 - + + ­1 + - + -

If the controller driving the ETS valve is from
another manufacturer than Danfoss or a custom
design, the following points must be considered
in order to overcome potential step loss.

a. To ensure total closing of the valve, the

controller should have a function to overdrive
the valve in the closing direction. It is
recommended to overdrive ten percent of the
full step range at appropriate intervals.

↓ OPENING ↓

b. 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 steps
after a defined number of changes in opening
degree.

Warning:

At power failure the ETS valve 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 | DCS (rm) | 2019.02

DKRCC.PD.VD1.3C.02 | 4

Data sheet | Electric expansion valve, type ETS 12.5 – ETS 400

Valve application

Controller/Driver

Temperature sensor

Danfoss

93G18.14

ETS

Valve operation The ETS valves operate modulating by

electronically controlled activation of the AST
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 AST motor housing has a glass sealed M12
connection as standard, which can be connected
with customized cable and plug/socket
combinations.

Temperature sensor

Evaporator

Pressure transmitter

Operating the ETS series requires a controller

with either 12 V DC voltage drive (5.5 W) or using

chopper current drive (100 mA RMS).

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.

In order to increase max. cable length

considerably, install a 10 mH filter type Danfoss

AKA 211 on the four power terminals.

Please contact Danfoss for further information

how and when to apply this countermeasure in

cases with questionable cable length.

© Danfoss | DCS (rm) | 2019.02

The piston design inside the ETS 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.

DKRCC.PD.VD1.3C.02 | 5

34G181.10

Data sheet | Electric expansion valve, type ETS 12.5 – ETS 400

Coolselector2®

For easy and precise selection of valve, use Danfoss’ CoolSelector2® software. You can find the ETS
valves on the group, “Electronic expansion valves”.
You can download it from http://coolselector.danfoss.com

ETS 250, ETS 400
Valve incl. actuator

A B

ETS for oil free applications
Valve incl. actuator

A B

Rated capacity1 Connection

Type

R410A R407C R22 R134a R404A ODF × ODF (A × B) Code no.

[kW] [TR] [kW] [TR] [kW] [TR] [kW] [TR] [kW] [TR] [in.] [mm] Single pack

ETS 250 – – 1212 349 1106 319 874 252 828 239

ETS 400 – – 1933 556 1764 509 1394 402 1320 381

1

) The Rated capacity is based on:
Evaporating temperature te : 5 °C / 40 °F
Liquid temperature tl : 28 °C / 82 °F
Condensing temperature tc : 32 °C / 90 °F
Full stroke opening in normal flow direction

Rated capacity1 Connection

Type

R410A R407C R22 R134a R404A ODF × ODF (A × B) Code no.

[kW] [TR] [kW] [TR] [kW] [TR] [kW] [TR] [kW] [TR] [in.] [mm] Single pack

Oil free
ETS 250

Oil free
ETS 400

1

) The Rated capacity is based on:
Evaporating temperature te : 5 °C / 40 °F
Liquid temperature tl : 28 °C / 82 °F
Condensing temperature tc : 32 °C / 90 °F
Full stroke opening in normal flow direction

– – 1212 349 1106 319 874 252 828 239

– – 1933 556 1764 509 1394 402 1320 381

1 1/8 × 1 1/

1 3/8 × 1 3/

1 5/8 × 1 5/

28 × 28 034G2600

8

35 × 35 034G2601

8

8

– 034G2602

– 42 × 42 034G2611*

2 1/8 × 2 1/

1 5/8 × 1 5/

2 1/8 × 2 1/

8

8

8

– 034G2624

– 034G3500

54 × 54 034G3501

ETS 250 and ETS 400 have integrated sight glass
except 034G2611.

1 3/8 × 1 3/

1 5/8 × 1 5/

1 5/8 × 1 5/

2 1/8 × 2 1/

35 × 35 034G2625

8

8

8

8

– 034G2626

– 034G3514

54 × 54 034G3515

ETS 250 and ETS 400 have integrated sight glass

Spare parts

© Danfoss | DCS (rm) | 2019.02

For smaller capacities of ETS oil free valves see ETS Colibri

Cone/piston for ETS 12.5 / ETS 25

Items Description

Danfoss

Cone/piston for ETS 12.5 + metal gasket 1 034G2345

Cone/piston for ETS 25 + metal gasket 1 034G2346

Actuator with integrated M12 connection

Items Description

34G179.10
Danfoss

34G179.10
Danfoss

*For oil free spare parts of ETS 250 and ETS 400. Please contact Danfoss.

Actuator with integrated M12 with Ceramic bearing
(incl. metal gasket) for ETS 12.5, ETS 25

Actuator with integrated M12 with ceramic bearing
(incl. metal gasket) for ETS 25B, ETS 50, ETS 100, ETS
250, ETS 400

Metal Gasket 1 034G2344

Quantity

[pcs]

Quantity

[pcs]

1 034G2088

1 034G2087*

DKRCC.PD.VD1.3C.02 | 6

Code no.

Code no.