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.
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 oilAll 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
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 enclosureIP67
Stepper motor typeBi-polar - permanent magnet.
Step mode2 phase full step.
Phase resistance52 Ω ±10%
Phase inductance85 mH
Step angle
Nominal voltage
Phase currentUsing chopper drive: 100 mA RMS -4% – 15%
Holding current
Max. total powerVoltage / current drive: 5.5 / 1.3 W (UL: NEC class 2)
Step rate
Total steps
Full travel time
Lifting height
Reference positionOverdriving against the full close position
Electrical connectionM12 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.
Compatible Danfoss controllersDanfoss 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
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 ICoil II
RedGreenWhiteBlack
↑ 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.
Data sheet |Electric expansion valve, type ETS 12.5 – ETS 400
Valve application
Controller/Driver
Temperature sensor
Danfoss
93G18.14
ETS
Valve operationThe 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
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
AB
ETS for oil free applications
Valve incl. actuator
) 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
) 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 × 28034G2600
8
35 × 35034G2601
8
8
–034G2602
–42 × 42034G2611*
2 1/8 × 2 1/
1 5/8 × 1 5/
2 1/8 × 2 1/
8
8
8
–034G2624
–034G3500
54 × 54034G3501
ETS 250 and ETS 400 have integrated sight glass
except 034G2611.
For smaller capacities of ETS oil free valves see ETS Colibri
Cone/piston for ETS 12.5 / ETS 25
ItemsDescription
Danfoss
Cone/piston for ETS 12.5 + metal gasket1034G2345
Cone/piston for ETS 25 + metal gasket1034G2346
Actuator with integrated M12 connection
ItemsDescription
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 Gasket1034G2344
Quantity
[pcs]
Quantity
[pcs]
1034G2088
1034G2087*
DKRCC.PD.VD1.3C.02 | 6
Code no.
Code no.
Data sheet |Electric expansion valve, type ETS 12.5 – ETS 400
Note:
ETS valve type ETS 12.5, ETS 25, ETS 50 and ETS 100 are currently in process of being
phased-out, Please select ETS Colibri sizes 12C-100C as a replacement.
For further information see: Colibri.danfoss.com
Data sheet |Electric expansion valve, type ETS 12.5 – ETS 400
Accessories:
M12 angle cable
Approvals
Specification
M12 angle female connector is intended for use with a standard M12 male connector,
available on stepper motor valves.
This cable is designed to offer high flexibility and small outer diameters with tensile strength.
The angle way M12 cable consist of paired, twisted wires, which decreases mutual influence between
signals transmitted along the cable and reduces influence of external sources of interference.
The cables thus provides a higher degree of protection against lost steps compared to other cables.
RoHS
Jacket PVC - black
Cable outer sheath Oil - resistant
Water proof rating IP 67
Operating temperature range -40 – +80 °C
Wire type Twisted pair, cross section 20 AWG / 0.5 mm2
Cable outer diameter 7.0 mm
Minimum bending radius 10 x cable diameter
Cable combustibility / test Flame retardant / VW-1 / CSA FT - 1
M12 standard EN 61076-2-101
Reference standard UL style 2464 and DIN VDE 0812
LVD directive 2014/35/EU
35 mm / 1.4 inch2 + 0.089 meters / 6.6 + 0.3 feet
49 mm / 1.9 inch
DKRCC.PD.VD1.3C.02 | 8
Data sheet |Electric expansion valve, type ETS 12.5 – ETS 400
Valve sizing
Valve selection
Step 1
For optimum performance, it is important to
correct the evaporator capacity. Selection is
also dependent on an acceptable pressure drop
across the valve. The evaporator capacity must be
corrected if sub cooling deviates from 4K / 7.2 °F.
In order to select the correct size of ETS you will
need the following information:
• Max. acceptable pressure drop in the ETS
valve in [bar] or [psi] ∆p
• Sub cooling ∆t
sub
• Connection size
Example
When selecting the valve it may be necessary to
apply a correction factor to the actual evaporator
capacity. This correction factor is required when
system conditions are different from table
conditions. Selection also depends on having an
acceptable pressure drop across the valve. The
following example illustrates correct selection of
the valve.
Refrigerant: R410A
• Evaporator capacity: Qe = 500 kW / 143 TR
• Condensing temperature: tc = 25 °C / 77 °F
• Condensing pressure: pc = 23 bar / 330 psig
• Evaporating temperature: te = +10 °C / 50 °F
• Evaporating pressure: pe = 9.8 bar / 142 psig
• Liquid Line Loss: pl = 0.5 bar (estimate)
• Max. Pressure drop in the valve:
∆p = pc - pl - pe = 23 - 0.5 - 9.8 = 12.7 bar / 184 psi
• Connection size: 1/ × 1/ in.
Determine the correction factor for sub cooling
∆t
.
sub
From the correction factors table (see below) a
sub cooling of 15K / 27 °F, R410A corresponds to
a factor of 1.15.
Corrected evaporator capacity is
Qe (Corrected) = 500 kW/1.15 = 435 kW (124 TR)
Now select the appropriate capacity table, R410A,
and choose the column for an evaporating
temperature of te = 10 °C / 50 °F.
Using the corrected evaporator capacity, select
a valve that provides an equivalent or greater
ETS 100 delivers 503.8 kW / 143 TR at 14 bar
which is slightly higher than 12.7 bar / 184 psi
pressure drop across the valve. Based on the
required connection size of 1
1
/
in., the ETS 100 is
8
the proper selection for this example.
capacity at an acceptable pressure drop across
the valve of 12.7 bar / 184 psi.
For easy and precise selection of valve, use Danfoss’ CoolSelector software. You can download it from
http://www.danfoss.com/businessareas/refrigerationandairconditioning/
product+selection+tools+details/coolselector.htm
The capacities stated in the tables are for the normal flow direction. For ETS 50 and 100 specifically, the capacity in reverse flow direction varies between 90% and 125% of the
capacity in normal flow direction.
The capacities stated in the tables are for the normal flow direction. For ETS 50 and 100 specifically, the capacity in reverse flow direction varies between 90% and 125% of the
capacity in normal flow direction.
All Danfoss products fulfill the requirements in REACH.
One of the obligations in REACH is to inform customers about presence of Candidate list substances if any, we hereby inform you about one substance on the candidate list:
A moist indicator in the sight glass contains a paper which is impregnated with Cobalt Dichloride (CAS no: 7646-79-9) in a concentration above 0.1% w/w.
- Avoid skin contact with the paper - Do not inhale the dust from the paper - The paper must be disposed as hazardous waste.