Siemens ACVATIX PS53 User manual

CE2N4717en

10.11.2011 Building Technologies

4717

ACVATIX™

Modulating refrigerant

valves, PS53

MVS661..N

for ammonia (R717) and safety refrigerants

One valve type for expansion, hot-gas and suction throttle applications

Hermetically sealed

Selectable standard interface DC 0/2...10 V or DC 0/4...20 mA

High resolution and control accuracy

Precise positioning control and position feedback signal

Short positioning time (< 1 second)

Closed when deenergized

Robust and maintenance-free

DN 25 with kvs values from 0.10 to 6.3 m³/h

Use

The MVS661..N refrigerant valve is designed for modulating control of refrigerant cir-

cuits including chillers and heat pumps. It is suitable for use in expansion, hot-gas and

suction throttle applications. In addition to ammonia (R717), the valve can handle all

standard safety refrigerants, noncorrosive gases / liquids and CO2(R744). It is not

suited for use with inflammable refrigerants.

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Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

Type summary

The refrigeration capacity refers to applications using ammonia.

Product number DN kvs kvs reduced pmax Q0E Q0H Q0D SNA Pmed

[m3/h] [m3/h] [MPa] [kW] [kW] [kW] [VA] [W]

MVS661.25-016N 25 0,16 0,10 95 10 2

MVS661.25-0.4N 25 0,40 0,25 245 26 5

MVS661.25-1.0N 25 1,0 0,63 610 64 12

MVS661.25-2.5N 25 2,5 1,6 1530 159 29

MVS661.25-6.3N 25 6,3 4,0

2,5

3850 402 74

22 12

kvs = Nominal flow rate of refrigerant through the fully open valve (H100) at a differential pressure

of 100 kPa (1 bar) to VDI 2173

If required kvs-value and refrigeration capacity Q0can be reduced to 63 %, refer to «kvs re-

duction» on page 3

∆pmax = Maximum permissible differential pressure across the control path A AB of the valve,

valid for the entire actuating range of the motorized valve

Q0E = Refrigeration capacity in expansion applications

Q0H = Refrigeration capacity in hot-gas bypass applications

Q0D = Refrigeration capacity in suction throttle applications and ∆p = 0.5 bar

SNA = nominal apparent power for selecting the transformer

Pmed = typical power consumption

The pressure drop across evaporator and condenser is assumed to be 0.3 bar each, and 1.6 bar up-

stream of the evaporator (e.g. spider).

The capacities specified are based on superheating by 6 K and subcooling by 2 K.

Product number DN kvs

[m3/h]

ASR0.16N 25 0,16

ASR0.4N 25 0,40

ASR1.0N 25 1,0

ASR2.5N 25 2,5

ASR6.3N 25 6,3

The refrigeration capacity for various refrigerants and operating conditions can be cal-

culated for the 3 types of application using the tables starting from page 12.

For accurate valve sizing, the valve selection program "Refrigeration VASP" is recom-

mended.

Ordering

Valve body and magnetic actuator form one integral unit and cannot be separated.

Should the valve’s electronics become faulty, the entire electronics housing is to be

replaced by spare part ASR61, which is supplied complete with Mounting Instructions

(74 319 0270 0).

See table on page 16.

If plant is resized, or should excessive wear impact the valve’s perform-

ance, a new valve insert ASR…N will restore the valve’s characteristics to

its original specifications.

The valve insert is supplied complete with Mounting Instructions

(74 319 0486 0).

Accessories

Valve insert ASR..N

Example: Product number Stock number Designation Quantity

MVS661.25-0.4N MVS661.25-0.4N Refrigerant valve 1

Spare parts

Replacement electron-

ics ASR61

Rev. no.

Valve insert ASR..N

3 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

Technical design / functions

4 selectable standard signals for setpoint and measured value

DIL switch to reduce the kvs value to 63 % of the nominal value

Potentiometer for adjustment of minimum stroke for suction throttle applications

Automatic stroke calibration

Forced control input for "Valve closed" or "Valve fully open”

LED for indicating the operating state

The MVS661..N refrigerant valve can be driven by Siemens or third-party controllers

that deliver a DC 0/2...10 V or DC 0/4...20 mA output signal.

For optimum control performance, we recommend a 4-wire connection between con-

troller and valve. When operating on DC voltage, a 4-wire connection is mandatory!

The valve stroke is proportional to the control signal.

If the positioning signal is interrupted, or in the event of a power failure, the valve’s

return spring will automatically close control path 1 3.

4716Z15

2on

1234

G0 G Y UMZC

1 Connection terminals

2 LED for indication of operating state

3 Minimal stroke setting potentiometer Rv

4 Autocalibration

5 DIL switches for mode control

Switch Function ON / OFF Description

ON Current [mA]

Positioning signal Y

OFF Voltage [V] 1)

ON DC 2…10 V, 4…20 mA

Positioning range Y and U

OFF DC 0…10 V, 0…20 mA 1)

ON Current [mA]

Position feedback U

OFF Voltage [V] 1)

ON 63 %

Nominal flow rate kvs

OFF 100 % 1)

1) Factory setting

When kvs reduction (DIL switch 4 in

position ON) the stroke will be lim-

ited to 63 % mechanical stroke. 63

% of full stroke then corresponds to

an input / output signal of 10 V.

If, in addition, the stroke is limited

to 80 %, for example, the minimum

stroke will be

0.63 x 0.8 = 0.50 of full stroke.

Features and benefits

Control

Spring return function

Operator controls and

indicators in the

electronics housing

Configuration of

DIL switches

kvs-reduction

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Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

80 %

100 %

4716D01en

0 %

0 % 100 %

Y-inp ut

Stroke

In the case of the suction throttle valve, it is

essential that a minimum stroke limit be

maintained to ensure compressor cooling

and efficient oil return. This can be

achieved with a reinjection valve, a bypass

line across the valve, or a guaranteed

minimum opening of the valve. The mini-

mum stroke can be defined via the control-

ler and control signal Y, or it can be set

directly with potentiometer Rv.

The factory setting is zero (mechanical stop in counterclockwise direction, CCW). The

minimum stroke can be set by turning the potentiometer clockwise (CW) to a maximum

of 80 % kvs.

Under no circumstances must potentiometer Rv be used to limit the stroke on

expansion applications. It must be possible to close the valve fully.

ZC – Function

no function fully open closed

ConnectionsTransfer

GG G

function

ZC not connected

Valve will follow the Y-signal

Minimum stroke set-ting

with potentiometer Rv pos-

sible

ZC connected to G

Valve will fully open control

path A AB

ZC connected to G0

Valve will close control path

A AB

1. Forced control signal ZC

2. Signal input Y and/or minimum stroke set-ting with potentiometer Rv possible

The printed circuit board of the MVS661..N has a slot to facilitate calibration.

To make the calibration, insert a screwdriver in the slot so that the contacts

inside are connected. As a result, the valve will first be fully closed and then

fully opened.

Calibration matches the electronics to the valve’s mechanism.

During the calibration process the green LED flashes for about 10 seconds;

refer to "Indication of operating state" (page 5).

01124

MVS661..N refrigerant valves are supplied fully calibrated.

Execute a calibration after replacing the electronics, when the red LED is on or

when the valve is leaking (at seat).

Minimum stroke set-

ting

Attention

Forced control input ZC

Signal priority

Calibration

When is a calibration

required?

5 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

LED Indication Function Remarks, troubleshooting

Green Lit

Control mode Automatic operation; everything o.k.

Flashing

Calibration in pro-

gress

Wait until calibration is finished

(green or red LED will be lit)

Red Lit

Calibration error

Internal error

Recalibrate (operate button in opening 1x)

Replace electronics module

Flashing

Mains fault Check mains network (outside the frequency or

voltage range)

Both Dark

No power supply

Electronics faulty

Check mains network, check wiring

Replace electronics module

The 4-wire connection should always be given preference!

SNA PMED IFWire cross-section [mm2]

1.5 2.5 4.0 2)

Product number [VA] [W] [A] max. cable length L [m]

MVS661..N 22 12 1.6…4 A 65 110 160

MVS661..N 22 12 1.6…4 A 20 35 50

SNA = nominal apparent power for selecting the transformer

PMED = typical power consumption

IF= required slow fuse

L = max. cable length; with 4-wire connections, the max. permissible length of the separate 1.5 mm2

copper positioning signal wire is 200 m

1) All information at AC 24 V

2) With 4 mm2electrical wiring reduce wiring cross-section for connection inside valve to 2.5 mm2.

Sizing

For straightforward valve sizing, refer to the tables for the relevant application (from

page 9).

For accurate valve sizing, we recommend to make use of the valve sizing software

"Refrigeration VASP", available from your local Siemens office.

The refrigeration capacity Q0is calculated by multiplying the mass flow by the specific

enthalpy differential found in the h, log p-chart for the relevant refrigerant. To help de-

termine the refrigeration capacity more easily, a selection chart is provided for each

application (from page 10). With direct or indirect hot-gas bypass applications, the en-

thalpy differential of Qc(the condenser capacity) must also be taken into account when

calculating the refrigeration capacity.

If the evaporating and/or condensing temperatures are between the values shown in

the tables, the refrigeration capacity can be determined with reasonable accuracy by

linear interpolation (refer to the application examples from page 11).

At the operating conditions given in the tables, the permissible differential pressure

pmax (25 bar) across the valve is within the admissible range for these valves.

If the evaporating temperature is raised by 1 K, the refrigeration capacity increases by

about 3 %. If, by contrast, subcooling is increased by 1 K, the refrigeration capacity

increases by about 1 to 2 % (this applies only to subcooling down to approximately

8 K).

Engineering notes

Depending on the application, it may be necessary to observe additional Installation

Instructions and fit appropriate safety devices (e.g. pressurestats, full motor protection,

etc.).

In order not to damage the seal inside the valve insert, the plant must be vented on the

low-pressure side after the pressure test has been made (valve port AB), or the valve

Indication of operating

state

Connection type 1)

4-wire connection

3-wire connection

Notes

Warning

6 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

must be fully open during the pressure test and during venting (power supply con-

nected and positioning signal at maximum or forced opening by G ZC).

To prevent the formation of flash gas on expansion applications, the velocity of the

refrigerant in the fluid pipe must not exceed 1 m/s. To assure this, the diameter of the

fluid pipe must under certain circumstances be greater than the nominal size of the

valve.

1 = evaporator

2 = compressor

3 = condenser

4 = expansion valves

a) The differential pressure over reduction must be less than half the differential

pressure ΔpFL.

b) The inlet path between diameter reduction and expansion valve inlet

Must straight for at least 600 mm

May not contain any valves

A filter / dryer must be mounted upstream of the expansion valve.

The valve is not explosion-proof.

Mounting notes

The valve should be mounted and commissioned by qualified staff. The same applies

to the replacement electronics and the configuration of the controller (e.g. SAPHIR or

PolyCool).

90°

4716Z16

90°

The refrigerant valves can be mounted in any orientation, but

upright mounting is preferable.

Arrange the pipework in such a way that the valve is not lo-

cated at a low point in the plant where oil can collect.

The pipes should be fitted in such a way that the alignment

does not distort the valve connections. Fix the valve body so

that that it cannot vibrate. Vibration can lead to burst connec-

tion pipes.

Before soldering the pipes, ensure that the direction of flow

through the valve is correct.

The pipes must be soldered with care. To avoid dirt and the

formation of scale (oxide), inert gas is recommended for sol-

dering.

The flame should be large enough to ensure that the junction

heats up quickly and the valve does not get too hot.

The flame should be directed away from the valve.

During soldering, cool the valve with a wet cloth, for example,

to ensure that it does not become too hot.

Expansion application

Engineering notes

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Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

Port B must be sealed off when a 2-port valve (AB A) is

used.

The valve body and the connected pipework should be lagged.

The actuator must not be lagged.

The valve is supplied complete with Mounting Instructions 74 319 0707 0.

Maintenace notes

The refrigerant valve is maintenance-free.

If the valve’s interior is subjected to great wear, the valve can be repaired by replacing

the ASR..N valve insert.

Disposal

The actuator contains electrical and electronic components and must not be disposed

of together with domestic waste.

Legislation may demand special handling of certain components, or it may be sensible

from an ecological point of view

Current local legislation must be observed.

Warranty

Application-specific technical data must be observed.

If specified limits are not observed, Siemens Building Technologies / CPS Prod-

ucts will nor assume any responsibility.

Technical data

Functional actuator data

Power supply Extra low-voltage only (SELV, PELV)

AC 24 V Operating voltage AC 24 V ± 20 %

Frequency 45...65 Hz

Typical power consumption Pmed 12 W

Stand by < 1 W (valve closed)

Rated apparent power SNA 22 VA (for selecting the transformer)

Required fuse IF1,6…4 A, slow

DC 24 V Operating voltage DC 20…30 V

Current draw 0,5 A / 2 A (max.)

Signal inputs Positioning signal Y DC 0/2…10 V or DC 0/4…20 mA

Impedance DC 0/2…10 V 100 k// 5nF (load < 0,1 mA)

DC 0/4…20 mA 240 // 5nF

Forced control ZC

Input impedance 22 k

Close valve (ZC connected to G0) < AC 1 V; < DC 0,8 V

Open valve (ZC connected to G) > AC 6 V; > DC 5 V

No function (ZC not wired) Positioning signal Y active

Signal outputs Position feedback U Voltage DC 0/2…10 V; load resistance 500 

Current

DC 0/4…20 mA; load resistance 500 

Stroke measurement

Nonlinearity

Inductive

± 3 % of end value

Positioning time Positioning time < 1 s

Electrical connection Cable entry 3 x Ø 17 mm (for M16)

Minimal wire cross-section 0.75 mm2

Maximum cable length Refer to "Connection type", page 5

Repair

8 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

Functional valve data Permissible operating pressure max. 5.3 MPa (53 bar) 1)

Differential pressure Δpmax 2.5 MPa (25 bar)

Valve characteristic (stroke, kv) linear (to VDI / VDE 2173)

Leakage rate

(internally across seat)

max. 0,002 % kvs resp.

max. 1 Nl/h gas at p = 4 bar

Shut/off function, like solenoid normally closed (NC)

function

External seal hermetically sealed!

Permissible media Ammonia (R717), CO2 (R744) and all safety refrig-

erants (R22, R134a, R404A, R407C, R507, etc);

Not suited for use with inflammable refrigerants

Medium temperature -40...120 °C; max. 140 °C for 10 min

Stroke resolution H / H100 1 : 1000 (H = stroke)

Hysteresis typically 3 %

Mode of operation modulating

Position when deenergized control path A AB closed

Mounting position

2) Upright to horizontal

Materials Valve body steel / CrNi steel

Seat / piston CrNi steel

Sealing disk / O-rings PTFE / CR (chloroprene)

Dimensions and weight Dimensions refer to "Dimensions", page 10

Weight 5.17 kg

Pipe connections Solder (weld-on-ends) Referring to EN 1092-1 and ASME B16.25 sche-

dule 40

Inner diameter 22.4 mm

Outer diameter 33.7 mm

Norms and standards CE conformity

to EMV-requirements

2004/108/EC

Immunity EN 61000-6-2:[2005] Industrial

Emission EN 61000-6-3:[2007] Residential

Electrical safety EN 60730-1

Protection class Class III to EN 60730

Pollution degree Degree 2 to EN 60730

Housing protection

Upright to horizontal

IP65 to EN 60529 2)

Vibration

4) EN 60068-2-6

5 g acceleration, 10...150 Hz, 2.5 h

(5 g horizontal, max. 2 g upright)

Conform to UL standards

CSA, Canada

C-tick

UL 873

C22.2 No. 24

N 474

Environmental compatibility ISO 14001 (Environment)

ISO 9001 (Quality)

SN 36350 (Environmentally compatible products)

RL 2002/95/EG (RoHS)

Permissible operating pressure PED 97/23/EC

Pressure accessories As per article 1, section 2.1.4

Fluid group 1 Without CE-marking as per article 3, section 3

(sound engineering practice)

1) To EN 12284 tested with 1,43 x operating pressure at 76 bar

2) At 45 °C < Tamb < 55 °C and 80 °C < Tmed < 120 °C the valve must be installed on its side to

avoid shortening the service life of the valve electronics

3) Transformer 160 VA (e.g. Siemens 4AM 3842-4TN00-0EA0)

4) In case of strong vibrations, use high-flex stranded wires for safety reasons.

9 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

General

environmental conditions

Operation

EN 60721-3-3

Transport

EN 60721-3-2

Storage

EN 60721-3-1

Climatic conditions Class 3K6 Class 2K3 Class 1K3

Temperature –25...55 °C –25...70 °C –5...45 °C

Humidity 10...100 % r. h. < 95 % r. h. 5...95 % r. h.

Connection terminals

Operating voltage AC / DC 24 V

DC 0 ... 10 V / 2 ... 10 V

0 ... 20 mA / 4 ... 20 mA

DC 0 ... 10 V / 2 ... 10 V

0 ... 20 mA / 4 ... 20 mA

Control signal

Measuring neutral (= G0)

Position feedback signal

Override input

Connection diagrams

Common Transformer Separate Transformer

UIndication of valve position (only if required). DC 0...10 V →0...100 % volumetric flow V100

Twisted pairs. If the lines for AC 24 V power supply and the DC 0...10 V (DC 2...10 V,

DC 0... 20 mA, DC 4... 20 mA) positioning signal are routed separately, the AC 24 V line need

not be twisted.

Piping must be connected to potential earth!

Factory setting: Valve characteristics equal-percentage, positioning signal DC 0...10 V.

Details see "Configuration DIL switches", page 3.

See "Calibration", page 4.

Terminal assignment

for controller with

4-wire connection

(to be preferred!)

Terminal assignment

for controller with

3-wire connection

Warning

DIL switch

Calibration

10 / 16

Siemens Modulating refrigerant valves, PS53 CE2N4717en

Building Technologies 10.11.2011

Dimensions

Dimensions in mm

210 min. 100

124

284

ø 22.4

ø 33.7

160

ø 60

4717M01

Valve sizing with correction factor

The applications and correction tables on the following pages are designed for help

with selecting the valves. To select the correct valve, the following data is required:

Application

Expansion (starting on page 11)

Hot-gas (starting on page 13)

Suction throttle (starting on page 15)

Refrigerant type

Evaporating temperature to[ °C]

Condensing temperature tc[ °C]

Refrigeration capacity Q0[kW]

To calculate the nominal capacity, use the following formula:

kvs [m³/h] = Q0[kW] / K…* *K… for Expansion = KE

for hot-gas = KH

for suction throttle = KS

The theoretical kvvalue for the nominal refrigeration capacity of the plant should not

be less than 50 % of the kvs value of the selected valve

For accurate valve sizing, the valve selection program "Refrigeration VASP" is rec-

ommended

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