Danfoss WSH090, WSH184 Application guide

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Application guidelines

Danfoss scroll compressors

WSH090 to WSH184

50 - 60 Hz - R410A

http://cc.danfoss.com

Application Guidelines

Content

Scroll compression principle ..................................................4

Features ....................................................................................5

Compressor model designation .............................................6

Nomenclature ........................................................................................................ 6

Technical specications ..........................................................7

50-60 Hz data ......................................................................................................... 7

Dimensions ...............................................................................8

WSH090-105-120-140* and 161* .....................................................................8

WSH 140 and 161 code 3 and WSH184.......................................................... 9

Connection details .............................................................................................10

Electrical data, connections and wiring ..............................11

Motor voltage ....................................................................................................... 11

Wiring connections ............................................................................................ 11

IP rating ................................................................................................................... 11

Terminal box temperature ..............................................................................11

Three phase electrical characteristics ......................................................... 12

Danfoss MCI

soft-start controller ............................................................................................ 13

General wiring information ............................................................................14

Motor protection ................................................................................................15

Phase sequence and reverse rotation protection .................................. 15

Voltage imbalance .............................................................................................. 15

Approval and certications ..................................................16

Approvals and certicates ............................................................................... 16

Pressure equipment directive ........................................................................ 16

Low voltage directive ........................................................................................ 16

Machines directive ............................................................................................. 16

Internal free volume .......................................................................................... 16

Operating conditions ............................................................17

Refrigerant and lubricants ............................................................................... 17

Motor supply ........................................................................................................ 18

Compressor ambient temperature .............................................................. 18

Application envelope ........................................................................................18

Discharge temperature protection ............................................................. 19

High and low pressure protection ............................................................... 19

Cycle rate limit ...................................................................................................... 20

System design recommendations ........................................21

General ....................................................................................................................21

Essential piping design recommendations ..............................................21

Refrigerant charge limit....................................................................................22

O-cycle migration ............................................................................................23

Liquid ood back ................................................................................................25

Specic application recommendations .............................. 26

Low ambient application .................................................................................26

Low load operation ............................................................................................27

Brazed plate heat exchangers ........................................................................ 27

Electronic expansion valve .............................................................................27

Reversible heat pump systems ...................................................................... 27

Water utilizing systems ..................................................................................... 29

Sound and vibration management ..................................... 30

Starting sound level ...........................................................................................30

Running sound level ..........................................................................................30

Stopping sound level ........................................................................................30

Sound generation in a refrigeration or air

conditioning system ..........................................................................................30

Installation ............................................................................. 32

Compressor handling and storage ..............................................................32

Compressor mounting ...................................................................................... 32

Compressor holding charge ........................................................................... 33

System cleanliness .............................................................................................. 33

Tubing ..................................................................................................................... 33

Brazing and soldering .......................................................................................33

System pressure test ..........................................................................................34

Leak detection ..................................................................................................... 35

Vacuum evacuation and moisture removal ..............................................35

Filter driers .............................................................................................................35

Refrigerant charging ..........................................................................................36

Insulation resistance and dielectric strength ........................................... 36

Commissioning .................................................................................................... 36

Oil level checking and top-up ........................................................................ 36

Ordering information and packaging ................................ 37

Packaging...............................................................................................................37

Ordering information ........................................................................................38

Accessories ............................................................................ 39

3FRCC.PC.028.A5.02

Application Guidelines

Scroll compression principle

In a Danfoss WSH scroll compressor, the compression is performed by two scroll elements located in the upper part of the compressor.

Suction gas enters the compressor at the suction connection. As all of the gas ows around and through the electrical motor, thus ensuring complete motor cooling in all applications, oil droplets separate and fall into the oil sump. After exiting the electrical motor, the gas enters the scroll elements where compression takes place. Ultimately, the discharge gas leaves the compressor at the discharge connection.

The gure below illustrates the entire compression process. The centre of the orbiting

scroll (in grey) traces a circular path around the centre of the xed scroll (in black). This movement creates symmetrical compression pockets between the two scroll elements. Low-pressure suction gas is trapped within each crescent-shaped pocket as it gets formed; continuous motion of the orbiting scroll serves to seal the pocket, which decreases in volume as the pocket moves towards the centre of the scroll set increasing the gas pressure. Maximum compression is achieved once a pocket reaches the centre where the discharge port is located; this stage occurs after three complete orbits. Compression is a continuous process: the scroll movement is suction, compression and discharge all at the same time.

SUCTION

COMPRESSION

DISCHARGE

4 FRCC.PC.028.A5.02

Application Guidelines

Features

WSH range is composed of WSH090-105-120140-161-184 which is based on current SH range light commercial platform. The WSH range benet from a further improved design

• Gas circulation, motor cooling and oil behaviour are improved on light commercial platform models by a new patented motor cap design.

• Part protection and assembly reduces internal leaks and increases life durability.

to achieve the ~5% higher eciency for low pressure ratio applications such as water cooled chiller, air-to-air rooftop etc...

• Improved part isolation reduces greatly acoustic levels.

• Gas intake design induces higher resistance to liquid slugging.

Heat shield that lowers the heat transfer between discharge and suction gas and the acoustic level

New PTFE spring seal for even lower leaks

R410A optimised and dedicated scroll prole

Patented motor cap

Liquid slug protection per suction tting in upper position

Patented motor centring spacer

Improved lower bearing centring

5FRCC.PC.028.A5.02

Application Guidelines

Compressor model designation

Danfoss WSH scroll compressors for R410A are available as single compressors. The example below presents the compressor nomenclature which equals the technical reference as shown on the compressor nameplate.

Nomenclature

Family,

lubricant

& refrigerant

Family, lubricant & refrigerant WSH: Scroll optimized for low pressure

ratio applications, POE lubricant, for R410A

Nominal capacity

in thousand Btu/h at 60 Hz, R410A, ARI conditions

UL index

Nominal capacity

Code numbers for ordering are listed section “Ordering information and packaging”.

Approvals Voltage Version Evolution

index

C4WSHAAL184

Evolution index

A~Z

Motor protection

L: Internal overload protector

Suction and discharge connections

A: Brazed connections

Motor voltage code

3: 200-230V/3~/60 Hz 4: 380-400V/3~/50 Hz - 460V/3~/60 Hz 7: 500V/3~/50 Hz - 575V/3~/60 Hz 9: 380V/3~/60 Hz

6 FRCC.PC.028.A5.02

Application Guidelines

50-60 Hz data

Technical specications

50Hz

60Hz

Nominal

Model

WSH090 7.5 22400 76500 7.2 2 3.10 10.59 88.40 15 .40 3.0 58.0

WSH105 9 26800 9150 0 8.60 3.12 10.63 103. 50 18.00 3.3 64.0

WS H120 10 30200 103100 9.54 3.17 10.80 116.90 20.30 3.3 64.0

WSH140 12 34100 11 6 40 0 10.70 3.19 10.87 133.0 0 23.12 3.3 67.0

WSH161 13 39000 133100 12 .10 3.22 11. 00 151.70 26.40 3.3 69.0

WSH184 15 44000 150200 13. 65 3.22 11.0 0 170 .30 29.60 3.6 71.5

WSH090 7.5 27500 93900 8.62 3.19 10.88 88.40 18.60 3.0 58.0

WSH105 9 32700 1116 00 10. 24 3 .19 10.90 103.50 21.80 3.3 64.0

WS H120 10 37000 12630 0 11. 38 3.25 11 .08 116.9 0 24.60 3.3 64.0

WSH140 12 416 00 142000 12.65 3.29 11.22 133. 00 2 7.90 3.3 67.0

WSH161 13 47400 1618 00 14 .40 3.29 11. 22 151. 70 31.90 3.3 69.0

WSH184 15 5310 0 181200 16. 33 3.25 11.1 0 170. 30 35.80 3.6 71.5

tons 60Hz

TR W Btu/h kW W/W Bty/h/W cm3/rev m3/h dm3 kg

Nominal cooling

capacity

Power

input

COP E.E.R

Swept

volume

Displacement

Oil charge Net weight

7FRCC.PC.028.A5.02

Application Guidelines

Dimensions

WSH090-105-120-140* and 161*

(* except code 3)

Ø 224

117

(1)

235

(2)

278

(1)

137

(2)

189

Oil sight glass

(1)

(2)

101

Equalisation line

(1)

482

(2)

540

(1)

451

(2)

509

Ø 243

(1)

(2)

101

4 x hole Ø 19.05

230

(1)

(2)

60°

Ø 29

Ø 35

190.5

30°

230

190.5

Ø 22

180

154

(1)

SH090

(1)

158

(2)

173

(2)

SH105 - 120 - 140* & 161*

* except code 3

All dimensions in mm

Flexible grommet

8 FRCC.PC.028.A5.02

HM 8 bolt

Lock washer

Flat washer

Steel mounting sleeve

Rubber grommet

Nut

15 mm

Application Guidelines

Dimensions

WSH 140 and 161 code 3 and WSH184

Ø 243

(1) 278 (2) 300

Oil sight glass

(1) 101 (2) 108

157

(1) 155 (2) 170

Equalisation line

(1) 101 (2) 108

Ø 243

(1) 509 (2) 525

(1) 540 (2) 555

230

4 x holes Ø19.05

190.5

Ø 35

60°

Ø 22

30°

230

190.5

173

200

(1) 154 (2) 159

(1) SH140 & 161 code 3 (2) SH184

All dimensions in mm

Flexible grommet

HM 8 bolt

Lock washer

Flat washer

Steel mounting sleeve

Rubber grommet

Nut

15 mm

9FRCC.PC.028.A5.02

Application Guidelines

Dimensions

Connection details

Suction and discharge connections

WSH 090 - 105 - 120 -

140 - 161 - 184

Version AL

Suction and discharge connections Brazed

Oil sight glass Threaded

Oil equalisation connection rotolock 1"3/4

Oil drain connection none

Low pressure gauge port (schrader) 1/4" are

Brazed version

Tube ODF

WSH090

WSH105 -120-140-161-184

Suction 1"1/8

Discharge 7/8"

Suction 1"3/8

Discharge 7/8"

Brazed

Oil sight glass All Danfoss WSH scroll compressors come

equipped with a sight glass (1"1/8 - 18 UNF) which may be used to determine the amount and condition of the oil contained within the sump.

Oil equalisation connection

WSH090-105-120-140-161-184: 1"3/4 rotolock connector allowing use of 1"3/4 - 7/8" or 1"3/4 1"1/8 sleeve. This connection must be used to mount an oil equalisation line when two or more compressors are mounted in parallel.

Schrader

The oil ll connection and gauge port is a 1/4" male are connector incorporating a schrader valve.

Oil ll connection and gauge port

Oil drain connection

10 FRCC.PC.028.A5.02

Application Guidelines

Electrical data, connections and wiring

Motor voltage

Wiring connections

WS H 090-105 -120 -14 0-161

Except WSH140-161 code 3

Danfoss WSH scroll compressors are available in ve dierent motor voltages as listed below.

Motor voltage code Code 3 Code 4 Code 7 Code 9

Nominal voltage - 380-400V - 3 ph 500V - 3 ph -

50 Hz

Voltage range - 340-440 V 450 - 550 V -

Nominal voltage 200-230V - 3 ph 460V - 3 ph 575 V-3 ph 380V- 3 ph

60 Hz

Voltage range 180-2 53 V 414-506 V 517- 632 V 342- 418 V

Electrical power is connected to the compressor terminals by Ø 4.8 mm (3/16") screws. The

The terminal box is provided with a Ø 25.5 mm (ISO25) and a Ø 29 mm (PG21) knockouts.

maximum tightening torque is 3 Nm. Use a 1/4’’ ring terminal on the power leads.

Terminal box

Ø 25.5 mm knockout

Ø 29 mm knockout

Power supply

WSH140and161 code 3 and WSH184

The terminal box is provided with a Ø40.5 mm hole (ISO40) for power supply and a Ø16.5 mm knockout (ISO16).

Ø 40.5 mm hole

Ø 16.5 mm knockout

Power supply

IP rating The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated

cable glands are used.

First numeral, level of protection against contact and foreign objects

5 - Dust protected

Second numeral, level of protection against water

4 - Protection against water splashing

Terminal box temperature

The temperature inside the terminal box may not exceed 70°C. Consequently, if the compressor is installed in an enclosure, precautions must be taken to avoid that the temperature around the compressor and in the terminal box would rise too much. The installation of ventilation on the enclosure panels may be necessary. If not, the

electronic protection module may not operate properly. Any compressor damage related to this will not be covered by Danfoss warranty. In the same manner, cables must be selected in a way to insure that terminal box temperature does not exceed 70°C.

11FRCC.PC.028.A5.02

Application Guidelines

Electrical data, connections and wiring

Three phase electrical characteristics

Compressor model

Motor voltage code 3

200-230V / 3ph / 60 Hz

Motor voltage code 4

380-400 V / 3ph / 50 Hz

460V / 3ph / 60hZ

Motor voltage code 7

500 V / 3ph / 50 Hz 575 V / 3 ph / 60 Hz

Motor voltage code 9

380 V / 3ph / 60 Hz

LRA MCC

A A A Ω

WSH090 203 43 42 0.39

WSH105 267 51 48 0.27

WS H120 267 61 54 0.27

WSH140 304 64 59 0.24

WSH161 315 69 68 0.22

WSH184 351 75 78 0.20

WSH090 98 22 18 1.47

WSH105 142 25 21 1.05

WS H120 142 29 23 1.05

WSH140 147 30 27 0.92

WSH161 158 33 30 0.83

WSH184 197 39 34 0.83

WSH090 84 18 15 2.34

WSH105 103 23 17 1. 57

WS H120 103 24 19 1.57

WSH140 122 26 21 1.38

WSH161 136 29 23 1.32

WSH184 135 34.7 27 1.32

WSH090 124 26 22 1.05

WSH105 160 33 25 0.72

WS H120 160 35 28 0.72

WSH140 168 37 32 0.62

WSH161 17 7 41 35 0.57

WSH184 239 50.8 40 0.57

Max Operating

current

Winding

Resistance

LRA (Locked Rotor Amp)

MCC (Maximum Continuous Current)

Max. operating Current

Locked Rotor Amp value is the higher average current as measured on mechanically blocked compressor tested under nominal voltage. The LRA value can be used as rough estimation for

The MCC is the current at which the motor protection trips under maximum load and low voltage conditions. This MCC value is the maximum at which the compressor can be operated in transient conditions and out of

The max. operating current is the current when the compressors operates at maximum load conditions and 10% below nominal voltage (+15°C evaporating temperature and +68°C condensing temperature).

the starting current. However in most cases, the real starting current will be lower. A soft starter can be applied to reduce starting current.

the application envelope. Above this value, the internal motor protection or external electronic module will cut-out the compressor to protect the motor.

Max Oper. A can be used to select cables and contactors.

In normal operation, the compressor current consumption is always less than the Max Oper. A. value.

12 FRCC.PC.028.A5.02

Application Guidelines

Electrical data, connections and wiring

Winding resistance

Danfoss MCI soft-start controller

Winding resistance is the resistance between phases at 25°C (resistance value +/- 7%).

Winding resistance is generally low and it requires adapted tools for precise measurement. Use a digital ohm-meter, a “4 wires” method and measure under stabilised ambient temperature. Winding resistance varies strongly with winding temperature. If the compressor is stabilised at a dierent value than 25°C, the measured resistance must be corrected using the following formula:

The inrush current for the Danfoss WSH scroll compressors with motor code 4 (400V /3ph / 50Hz or 460V / 3ph / 60Hz) can be reduced using the Danfoss digitally-controlled MCI compressor soft starter. MCI soft starters are designed to reduce the starting current of 3-phase AC motors; they can reduce the inrush current by up to 40%, thereby eliminating the detrimental

Compressor model

WSH090 MCI15C M CI15C

WSH105 MCI25C MCI25C

WS H120 MCI25C MCI25C

WSH140 MCI25C MCI25C *

WSH161 MCI25C MCI25C *

WSH184 MCI25C MCI25C *

* by pass contactor K1 is required

Soft start reference Ambient max. 40°C

a + t R

= R

tamb

25°C

a + t t

: reference temperature = 25°C

25°C

: temperature during measurement (°C)

amb

: winding resistance at 25°C

25°C

: winding resistance at tamb

amb

_______

25°C

Coecient a = 234.5

eects of high starting torque surges and costly demand charges from the resultant current spike. Upon starting, the controller gradually increases the voltage supplied to the motor until full-line voltage has been reached. All settings, such as ramp-up time (less than 0.5 sec) and initial torque, are preset and do not require modication.

Soft start reference Ambient max. 55°C

Input controlled soft start

MCI with by pass contactor

When the control voltage is applied to A1 - A2, the MCI soft starter will start the motor, according to the settings of the ramp-up time and initial torque adjustments. When the control voltage is switched OFF, the motor will switch o instantaneously.

By means of the built-in auxiliary contact (23-24) the by pass function is easily achieved, see wiring diagram beside.

No heat is generated from the MCI. As the contactor always switches in no-load condition it can be selected on the basis of the thermal current (AC-1).

13-14 contact not applicable with MCI 25C.

13FRCC.PC.028.A5.02

DGT

LPS

180 s

CONTROL CIRCUIT

F1F1

KA KA

L1 L3 L2

LLSV KS

Wiring diagram with pump-down cycle

L1 L3 L2

CONTROL CIRCUIT

F1F1

KM KA

KA KS

DGT

180 s

85 52 019 - A

KA KA

Wiring diagram without pump-down cycle

LPS

Application Guidelines

Electrical data, connections and wiring

General wiring information

The wiring diagrams below are examples for a safe and reliable compressor wiring. In case an alternative wiring logic is chosen, it is imperative to respect the following rules:

When a safety switch trips, the compressor must stop immediately and must not re-start until the tripping condition is back to normal and the safety switch is closed again. This applies to the LP safety switch, the HP safety switch, the discharge gas thermostat and the motor safety thermostat.

In specic situations, such as winter start operation, an eventual LP control for pumpdown cycles may be temporarily bypassed to

Suggested wiring diagrams logic

Compressor model WSH 090 - 105 - 120 - 140 - 161 - 184

allow the system to build pressure. But it remains mandatory for compressor protection to apply an LP safety switch. The LP safety switch must never be bypassed.

Pressure settings for the LP and HP safety switch and pump-down listed in table from section “Low pressure”.

When ever possible (i.e. PLC control), it is recommended to limit the possibilities of compressor auto restart to less than 3 to 5 times during a period of 12 hours when caused by motor protection or LP safety switch tripping. This control must be managed as a manual reset device.

Legend

14 FRCC.PC.028.A5.02

Fuses ..................................................................................................F1

Compressor contactor ................................................................. KM

Control relay ................................................................................... KA

Safety lock out relay .......................................................................KS

Optional short cycle timer (3 mins) ......................................180 s

External overload protection .......................................................F2

Pump-down pressure switch .......................................................LP

High pressure safety switch.........................................................HP

Control device .................................................................................TH

Liquid Line Solenoid valve ....................................................... LLSV

Discharge gas thermostat ........................................................ DGT

Fused disconnect ...........................................................................Q1

Motor safety thermostat ............................................................thM

Compressor motor ..........................................................................M

Motor Protection Module ........................................................MPM

Thermistor chain............................................................................... S

Safety pressure switch .................................................................LPS

Application Guidelines

Motor protection

Electrical data, connections and wiring

Compressor model

WSH 090 - 105 - 120 - 140- 161 - 184 Internal motor protection Internal reverse vent

Overheating

protection



Compressor models WSH090-105-120-140161 -184 have been provided with an internal overload motor protection to prevent against

Over current

protection

Locked rotor

protection

While not compulsory, an additional external overload is still advisable for either alarm or manual reset.

Phase reversal protection

excessive current and temperature caused by overloading, low refrigerant ow or phase loss. The cutout current is the MCC value listed in section “Three phase electrical characteristics”.

Then it must be set below MCC value (at max operating current:

• when the motor temperature is too high, then the internal protector will trip

The protector is located in the star point of the motor and, should it be activated, will cut out all three phases. It will be reset automatically.

• when the current is too high the external overload protection will trip before the internal protection therefore oering possibility of manual reset.

Phase sequence and reverse rotation protection

Use a phase meter to establish the phase orders and connect line phases L1, L2 and L3 to terminals T1, T2 and T3, respectively. The

direction, and the motor is wound so that if the connections are correct, the rotation will also be correct.

compressor will only operate properly in a single

Voltage imbalance

Compressor models WSH090-105-120-140161-184 incorporates an internal reverse vent valve which will react when the compressor is run in reverse and will allow refrigerant to circulate through a by-pass from the suction to the discharge. Although reverse rotation is not destructive for these models, it should be corrected as soon as possible. Repeated reverse rotation longer than 24hours may have negative impact on the bearings. Reverse rotation will be

The operating voltage limits are shown in the table section “Motor voltage”. The voltage applied to the motor terminals must lie within these table limits during both start-up and normal operations. The maximum allowable voltage

% voltage

imbalance

Vavg = Mean voltage of phases 1, 2, 3.

V1-2 = Voltage between phases 1 and 2.

= x 100

obvious to the user as soon as power is turned on: the compressor will not build up pressure, the sound level will be abnormally high and power consumption will be minimal. If reverse rotation symptoms occur, shut the compressor down and connect the phases to their proper terminals. If reverse rotation is not halted, the compressor will cycle o-on the motor protection.

imbalance is 2%. Voltage imbalance causes high amperage over one or several phases, which in turn leads to overheating and possible motor damage. Voltage imbalance is given by the formula:

2 x Vavg

V1-3 = Voltage between phases 1 and 3.

V2-3 = Voltage between phases 2 and 3.

15FRCC.PC.028.A5.02

Application Guidelines

Approval and certications

Approvals and certicates

Pressure equipment

directive 2014/68/EU

Low voltage directive

2014 /35/EU

WSH scroll compressors comply with the following approvals and certicates.

CE 0062 or CE 0038 or CE0871 (European Directive)

UL (Underwriters Laboratories)

Other approvals / certicates Contact Danfoss

Products WSH0 90-105 -120 -140-161-184

Refrigerating uids Group 2 Category PED II Evaluation module D1 Service temperature - Ts -35°C < Ts < 55°C Service pressure - Ps 33.3 bar(g) Declaration of conformity contact Danfoss

Products WSH090 to 184

Declaration of conformity ref. Low voltage Directive 2014/35/EU

Certicates are listed on the product datasheets: http://www.danfoss.com/odsg

All WSH models

All 60 Hz WSH models

Contact Danfoss

Machines directive

2006/42/EC

Internal free volume

Products WSH090 to 184

Manufacturer's declaration of incorporation ref. Machines Directive 2006/42/EC

Products Internal free volume without oil (litre)

WSH090 12. 4 WSH105-120-140 -161 14. 3 WSH184 14.6

Contact Danfoss

16 FRCC.PC.028.A5.02

Application Guidelines

Operating conditions

Refrigerant and lubricants

General information

The scroll compressor application range is inuenced by several parameters which need to be monitored for a safe and reliable operation.

These parameters and the main recommendations for good practice and safety devices are explained hereunder.

When choosing a refrigerant, dierent aspects must be taken into consideration:

• Legislation (now and in the future)

• Safety

• Application envelope in relation to expected running conditions

• Compressor capacity and eciency

• Compressor manufacturer recommendations and guidelines

Danfoss Commercial Compressors, along with the whole refrigeration and air conditioning industry, shares today’s concern about the environmental issues that are ozone depletion, global warming and overall energy consumption. Usual HCFCs refrigerant uids such as R22 are known to be implicated in these harmful phenomena, especially ozone depletion due to their chlorinated content. These substances are scheduled to be phased-out from production

• Refrigerant and lubricants

• Motor supply

• Compressor ambient temperature

• Application envelope (evaporating temperature, condensing temperature, return gas temperature)

Additional points could inuence the nal choice:

• Environmental considerations

• Standardisation of refrigerants and lubricants

• Refrigerant cost

• Refrigerant availability

and use in coming years, in accordance with the international Montreal Protocol (1984). As a result, new chlorine-free molecules have been recently developed and are now ready to replace former uids. Among those refrigerants, the HFC blend R410A is admitted by a great majority of manufacturers to be the most promising in terms of environmental impact, stability and eciency, and is already seen as the R22 replacement.

Chemical

properties

Environmental

impact

Thermodynamic

properties

R410A

Refrigerant R22 R407C R410A

Chlorine content yes no no

Zeotropic pure refrigerant zeotropic mixture near azeotropic mixture

Composition R22 R32 /R125/R134a R32 /R12 5

ODP 0.05 0 0

GWP 150 0 1526 172 5

Vapour pressure (bar) at 25°C 10.4 11.9 16.5

Cooling capacity of liquid (kJ/kg.K) at 25°C 1.24 1.54 1.84

Cooling capacity of vapor (kJ/kg.K) at 1 atm, 25 °C 0.657 0.829 0.833

Temperature glide (°C) 0 7.4 <0.2

WSH compressors are to be used with R410A refrigerant, with polyolester oil.

• R410A’s superior thermodynamical properties compared to R22 and R407C refrigerants allow for today’s massive – and necessary – switch to high eciency systems.

• Zero Ozone Depletion Potential (ODP): R410A does not harm the ozone layer.

• Global warming potential (GWP): R410A shows a relatively high warming potential. However, the GWP index denotes direct warming eect, which is relevant only in case of release to the atmosphere. A more accurate index is T.E.W.I., for Total Equivalent Warming Impact, which

• Because of the higher system eciency it allows to achieve, R410A is in this regard the best refrigerant.

• As a near-azeotropic mixture, refrigerant R410A behaves like an homogeneous substance, whereas other zeotropic mixtures such as R407C and other blends suer a temperature glide during phase change that lessens thermal eciency and makes them dicult to transfer from a container to another.

• Reduced refrigerant mass ow, permitted by a higher heat capacity, induce a lower sound level of the installation as well as more compact and lighter systems.

takes into account indirect contributions due to running energy costs.

17FRCC.PC.028.A5.02

Condensing temperature (°C)

Evaporating temperature (°C)

Application Guidelines

Operating conditions

POE oil Polyolester oil (POE) is miscible with HFC's

(while mineral oil is not), but has to be evaluated regarding lubrication ability in compressors. POE oil has better thermal stability than refrigerant mineral oil.

Motor supply WSH scroll compressors can be operated at

nominal voltages as indicated section “Motor voltage”. Under-voltage and over-voltage

Compressor ambient temperature

High ambient temperature

Low ambient temperature

WSH compressors can be applied from -35°C to 55°C ambient temperature. The compressors are designed as 100% suction gas cooled without

In case of enclosed tting and high ambient temperature it is recommended to check the temperature of power wires and conformity to their insulation specication.

Although the compressor itself can withstand low ambient temperature, the system may require specic design features to ensure safe

POE is more hygroscopic and also holds moisture more tight than mineral oil. It also chemically reacts with water leading to acid and alcohol formation.

operation is allowed within the indicated voltage ranges. In case of risk of under-voltage operation, special attention must be paid to current draw.

need for additional fan cooling. Ambient temperature has very little eect on the compressor performance.

In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 60°C before the overload will reset. A high ambient temperature can strongly delay this cool-down process.

and reliable operation. See section ‘Specic application recommendations’.

Application envelope

The operating envelope for WSH scroll compressors is given in the gure below, where the condensing and evaporating temperatures represent the range for steady-state operation. Under transient conditions, such as start-up and defrost, the compressor may operate outside this envelope for short periods. The operating limits serve to dene the envelope within which reliable operations of the compressor are guaranteed:

SH=15K

• Maximum discharge gas temperature: +135°C,

• A suction superheat below 5 K is not recommended due to the risk of liquid ood back,

• Maximum superheat of 30 K,

• Minimum and maximum evaporating and condensing temperatures as per the operating envelopes.

SH=10KSH=5K

18 FRCC.PC.028.A5.02

-30 -25 -20

-15 -10 -5 0 5 10 15 2

Cond. temp. (°C)

Application Guidelines

Operating conditions

Discharge temperature protection

The discharge gas temperature must not exceed 135°C.

The discharge gas thermostat accessory kit (code

7750009) includes all components required for installation as shown below. The thermostat must be attached to the discharge line within 150 mm from the compressor discharge port and must be thermally insulated and tightly xed on the pipe.

DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specic application envelope. Please refer to the examples below, which illustrate where DGT protection is required (Ex.1) and where it is not (Ex.2).

A discharge gas temperature protection device must be installed on all heat pumps. In reversible air-to-air and air-to-water heat pumps the discharge temperature must be monitored

Example 1 (R410A, SH = 11 K) LP switch setting: LP1 = 3.3 bar (g) (-15.5°C) HP switch setting: HP1 = 38 bar (g) (62°C) Risk of operation beyond the application envelope. DGT protection required.

Example 2 (R410A, SH = 11 K) LP switch setting: LP2 = 4.6 bar (g) (-10.5°C) HP switch setting: HP2 = 31 bar (g) (52°C) No risk of operation beyond the application envelope. No DGT protection required.

-30 -25 -20 -15

Thermostat

Discharge line

Bracket

Insulation

during development test by the equipment manufacturer.

The DGT should be set to open at a discharge gas temperature of 135°C.

The compressor must not be allowed to cycle on the discharge gas thermostat. Continuous operations beyond the compressor’s operating range will cause serious damage to the compressor!

Example 1

DGT - limit

LP1

LP2

-10

Evap. temp. (°C)

Example 2

R410A

-5 0510 15

HP1

HP2

High and low pressure protection

High pressure

A high-pressure (HP) safety switch is required to shut down the compressor should the discharge pressure exceed the values shown in the table section “System pressure test”. The high-pressure switch can be set to lower values depending on the application and ambient conditions. The HP

switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit. If a discharge valve is used, the HP switch must be connected to the service valve gauge port, which must not be isolated.

19FRCC.PC.028.A5.02

Application Guidelines

Operating conditions

Low pressure

A low-pressure (LP) safety switch must be used. Deep vacuum operations of a scroll compressor can cause internal electrical arcing and scroll instability. Danfoss WSH Scroll compressors exhibit high volumetric eciency and may draw very low vacuum levels, which could induce such a problem. The minimum low-pressure safety switch (loss-of-charge safety switch) setting is

Pressure settings R410A

Working pressure range high side bar (g) 13.5 - 44.5

Working pressure range low side bar (g) 2.3 - 11.6

Maximum high pressure safety switch setting bar (g) 45

Minimum low pressure safety switch setting * bar (g) 1. 5

Minimum low pressure pump-down switch setting ** bar (g) 2.3

* LP safety switch shall never be bypassed and shall have no time delay. ** Recommended pump-down switch settings: 1.5 bar below nominal evap. pressure with minimum of 2.3 bar(g)

Note that these two dierent low pressure switches also require dierent settings. The low pressure pump down switch setting must always be within the operating envelope, for example 2.3 bar for R410A. The compressor can

given in the following table. For systems without pump-down, the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit. The LP switch tolerance must not allow for vacuum operations of the compressor. LP switch settings for pump-down cycles with automatic reset are also listed in the table below.

minimum low pressure safety switch setting may be outside the normal operating envelope and should only be reached in exceptional (emergency) situations, for example 1.5 bar for R410A.

be operated full time under such condition. The

Cycle rate limit

Danfoss recommends a restart delay timer to limit compressor cycling. The timer prevents reverse compressor rotation, which may occur during brief power interruptions.

There must be no more than 12 starts per hour, a number higher than 12 reduces the service life of the motor-compressor unit. A three-minute (180sec) time out is recommended.

The system must be designed in a way that guarantees a minimum compressor running time of two minutes so as to provide for sucient motor cooling after start-up along with proper oil return. Note that the oil return may vary since it

T T

depends upon system design.

Please contact Danfoss Technical Support for any deviation from this guidelines.

A2 A3A1

180 s

20 FRCC.PC.028.A5.02

Application Guidelines

System design recommendations

General

Essential piping design recommendations

Successful application of scroll compressors is dependent on careful selection of the compressor for the application. If the compressor is not correct for the system, it will operate

The working pressure in systems with R410A is about 60% higher than in systems with R22 or R407C. Consequently, all system components and piping must be designed for this higher pressure level.

Proper piping practices should be employed to ensure adequate oil return, even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator. Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during o-cycles.

In systems with R410A, the refrigerant mass ow will be lower compared to R22/R407C systems. To maintain acceptable pressure drops and acceptable minimum gas velocities, the refrigerant piping must be reduced in size

beyond the limits given in this manual. Poor performance, reduced reliability, or both may result.

compared to R22 / R407C systems. Take care not to create too high pressure drops or since in R410A systems the negative impact of high pressure drops on the system eciency is stronger than in R22/R407C systems.

Piping should be designed with adequate threedimensional exibility. It should not be in contact with the surrounding structure, unless a proper tubing mount has been installed. This protection proves necessary to avoid excess vibration, which can ultimately result in connection or tube failure due to fatigue or wear from abrasion. Aside from tubing and connection damage, excess vibration may be transmitted to the surrounding structure and generate an unacceptable noise level within that structure as well. For more information on noise and vibration, see the section on: “Sound and vibration management”.

Suction lines

If the evaporator lies above the compressor, as is often the case in split or remote condenser systems, the addition of a pump-down cycle is strongly recommended. If a pump-down cycle were to be omitted, the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during o-cycles.

If the evaporator were situated below the compressor, the suction riser must be trapped so as to prevent liquid refrigerant from collecting at the outlet of the evaporator while the system is idle, which would mislead the expansion valve’s sensor (thermal bulb) at start-up.

max. 4 m

To condenser

U-trap

0.5% slope

4 m/s or more

U-trap, as short as possible

8 to 12 m/s

0.5% slope

4m/s or more

U trap, as short as possible

Evaporator

21FRCC.PC.028.A5.02

Application Guidelines

System design recommendations

Discharge lines

Heat exchangers

When the condenser is mounted at a higher position than the compressor, a suitably sized “U”-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the compressor during o cycle. The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped.

To obtain optimum eciency of the complete refrigerant system, optimised R410A heat exchangers must be used. R410A refrigerant has good heat transfer properties: it is worthwhile designing specic heat exchangers to gain in size and eciency.

An evaporator with optimised R410A distributor and circuit will give correct superheat at outlet and optimal use of the exchange surface. This is critical for plate evaporators that have generally a shorter circuit and a lower volume than shell and tubes and air cooled coils.

For all evaporator types a special care is required for superheat control leaving the evaporator and oil return.

Upper loop

U Trap

Condenser

3D exibility

A sub-cooler circuit in the condenser that creates high sub cooling will increase eciency at high condensing pressure. In R410A systems the positive eect of sub cooling on system eciency will be signicantly larger than in R22/R407C systems.

Furthermore, for good operation of the expansion device and to maintain good eciency in the evaporator it is important to have an appropriate sub cooling. Without adequate sub cooling, ash gas will be formed at the expansion device resulting in a high degree of vapour at the expansion device inlet leading to low eciency.

Refrigerant charge limit Danfoss WSH compressors can tolerate liquid

refrigerant up to a certain extent without major problems. However, excessive liquid refrigerant in the compressor is always unfavourable for service life. Besides, the installation cooling capacity may be reduced because of the evaporation taking place in the compressor and/or the suction line instead of the evaporator. System design must be such that the amount of liquid refrigerant in the compressor is limited. In this respect, follow the guidelines given in the section “Essential piping design recommendations” in priority.

22 FRCC.PC.028.A5.02

Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application.

Model

WSH090 5.9

WSH105-120-140 -161-184 7.9

Refrigerant charge limit

(kg)

Application Guidelines

System design recommendations

BELOW charge limit ABOVE charge limit

Cooling only systems,

Packaged units

Cooling only systems

with remote condenser

and split system units

Reversible heat pump system

REC

Note: for special conditions such as low ambient temperature, low refrigerant load or brazed plate heat exchangers please refer to corresponding sections.

No test or additional safeties required



Refrigerant migration and ood back test

REC

Sump heater

REC

Specic tests for repetitive ood back

REQ

Sump heater

REQ

Defrost test For more details, refer to section "Reversible heat pump system"

REQ

Recommended Required No test or additional safeties required

REQ

More detailed information can be found in the paragraphs hereafter. Please contact Danfoss Technical Support for any deviation from these guidelines.

O-cycle migration O-cycle refrigerant migration is likely to occur

when the compressor is located at the coldest part of the installation, when the system uses a bleed-type expansion device, or if liquid is allowed to migrate from the evaporator into the compressor sump by gravity. If too much liquid refrigerant accumulates in the sump, it will saturate the oil and lead to a ooded start. When the compressor starts running again, the refrigerant evaporates abruptly under the sudden decrease of the bottom shell pressure, causing the oil to foam. In extreme situations, this might result in liquid slugging (liquid entering the scroll elements), which must be avoided as it causes irreversible damage to the compressor.

Danfoss WSH scroll compressors can tolerate occasional ooded starts as long as the total system charge does not exceed the maximum compressor refrigerant charge.

Refrigerant migration and ood back test

REQ

Sump heater

REQ

Refrigerant migration and ood back test

REQ

Sump heater

REQ

Liquid receiver (in association with LLSV and

REC

pump down)



A suitable test to evaluate the risk of o-cycle migration is the following:

Stabilise the non running system at 5°C ambient temperature,

Raise the ambient temperature to 20°C and keep it for 10 minutes,

Start the compressor and monitor sump temperature, sight glass indication and sound level.

The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass. Foam in the oil sump indicates a ooded start.

A noisy start, oil loss from the sump and sump cool down are indications for migration. Depending on the amount of migration graduate measures shall be taken:

• Sump heater

• Liquid line solenoid valve

• Pump down cycle

23FRCC.PC.028.A5.02

Application Guidelines

System design recommendations

Sump heater The surface sump heaters are designed to protect

the compressor against o-cycle migration of refrigerant.

When the compressor is idle, the oil temperature in the sump of the compressor must be maintained at no lower than 10 K above the saturation temperature of the refrigerant on the low-pressure side. This requirement ensures that the liquid refrigerant is not accumulating in the sump. A sump heater is only eective if capable of sustaining this level of temperature dierence. Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind). Note that below –5°C ambient temperature and a wind speed of above 5m/second, we recommend that the heaters be thermally insulated in order to limit the surrounding energy losses.

Since the total system charge may be undened, a sump heater is recommended on all standalone compressors and split systems. In addition, any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a sump heater. A sump heater is also required on all reversible cycle applications.

Initial start-up: due to light commercial platform compact design, it is recommended to energize surface sump heater in advance to remove refrigerant at initial start-up only 6 hours in advance.

The heater must be energized whenever the compressor is o to avoid liquid refrigerant entering the compressor.

Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg. Seasonal shutdown). Surface sump heater accessories are available from Danfoss (see section “Accessories”).

Liquid line solenoid valve (LLSV)

Pump-down cycle A pump-down cycle represents one of the most

A LLSV may be used to isolate the liquid charge on the condenser side, thereby preventing against charge transfer or excessive migration to the compressor during o-cycles. The quantity of

eective ways to protect against the o-cycle migration of liquid refrigerant. Once the system has reached its set point and is about to shut o, the LLSV on the condenser outlet closes. The compressor then pumps the majority of the refrigerant charge into the condenser and receiver before the system stops on the low pressure pump-down switch. This step reduces the amount of charge on the low side in order to prevent o-cycle migration. The recommended low-pressure pump-down switch setting is 1.5 bar below the nominal evaporating pressure. It shall not be set lower than 2.3 bar(g). For suggested wiring diagrams, please see section "Suggested wiring diagrams logic".

refrigerant on the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV.

In certain conditions, the discharge valve in the WSH090 - 105 - 120 - 140 - 161 - 180 - 184 compressor may not completely seal and result in compressor restarts during pump down applications. An external, non-bleeding check valve may need to be installed.

Tests for pump down cycle approval:

• As the pump-down switch setting is inside the application envelope, tests should be carried out to check unexpected cut-out during transient conditions (i.e. defrost – cold starting). When unwanted cut-outs occur, the low pressure pump-down switch can be delayed. In this case a low pressure safety switch without any delay timer is mandatory.

24 FRCC.PC.028.A5.02

Application Guidelines

System design recommendations

Liquid ood back

• While the thermostat is o, the number of pressure switch resets should be limited to avoid short cycling of the compressor. Use dedicated wiring and an additional relay which allows for one shot pump-down.

The pump-down allows to store all the refrigerant in the high pressure side circuit. On unitary or close-coupled systems, where the system refrigerant charge is expected to be both correct and denable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized.

During normal operation, refrigerant enters the compressor as a superheated vapour. Liquid ood back occurs when a part of the refrigerant entering the compressor is still in liquid state.

Danfoss SH scroll compressors can tolerate occasional liquid ood back. However system

Liquid ood back test: repetitive liquid ood back testing must be carried out under expansion valve threshold operating conditions: a high pressure ratio and minimum evaporator load, along with the measurement of suction superheat, oil sump temperature and discharge gas temperature.

During operations, liquid ood back may be detected by measuring either the oil sump temperature or the discharge gas temperature. If at any time during operations, the oil sump temperature drops to within 10K or less above

Other application needs a liquid receiver to store the refrigerant.

Receiver dimensioning requires special attention. The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large. A large receiver easily leads to refrigerant overcharging during maintenance operation.

design must be such that repeated and excessive ood back is not possible.

A continuous liquid ood back will cause oil dilution and, in extreme situations, lead to lack of lubrication and high rate of oil leaving the compressor.

the saturated suction temperature, or should the discharge gas temperature be less than 35K above the saturated discharge temperature, this indicates liquid ood back.

Continuous liquid ood back can occur with a wrong dimensioning, a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air lters.

A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid ood back.

Suction accumulator: a suction accumulator oers protection against refrigerant ood back at start-up, during operations or defrosting by trapping the liquid refrigerant upstream from the compressor. The suction accumulator also protects against o-cycle migration by providing additional internal free volume to the low side of the system.

A suction accumulator must be carefully dimensioned, taking into account the refrigerant charge as well as the gas velocity in the suction line.

The accumulator should not be sized for less than 50% of the total system charge. Tests must be conducted to determine the actual refrigerant holding capacity needed for the application.

Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line.

25FRCC.PC.028.A5.02

Application Guidelines

Low ambient application

Low ambient start-up

Specic application recommendations

Under cold ambient conditions (<0°C), upon start-up the pressure in the condenser may be so low that a sucient pressure dierential across the expansion device cannot be developed to properly feed the evaporator.

As a result, the compressor may go into a deep vacuum, which can lead to compressor failure due to internal arcing and instability in the scroll wraps. Under no circumstances should the compressor be allowed to operate under vacuum. The low-pressure control must be set in accordance with the table section “Low pressure” in order to prevent this from happening.

Early feeding of the evaporator and management of the discharge pressure could help to attenuate these eects.

Low pressure dierentials can also cause the expansion device to “hunt” erratically, which might cause surging conditions within the evaporator, with liquid spillover into the compressor. This eect is most pronounced during low load conditions, which frequently occur during low ambient conditions.

Low ambient operations

The Danfoss WSH scroll compressor requires a minimum pressure dierential between the suction and discharge pressures (please refer to operation envelop) to force the orbiting scroll down against the oil lm on the thrust bearing. Anything less than this dierential and the orbiting scroll can lift up, causing a metalto-metal contact. It is therefore necessary to maintain sucient discharge pressure in order to ensure this pressure dierential. Care should be taken during low ambient operations when heat removal from air-cooled condensers is greatest and head pressure control may be required for low ambient temperature applications. Operation under low pressure dierential may be observed by a signicant increase in the sound power level generated by the compressor.

It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well. The following considerations should be taken into account to ensure proper system operating characteristics.

Expansion device: The expansion device should be sized to ensure proper control of the refrigerant ow into the evaporator. An oversized valve may result in erratic control. This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors. This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads.

The superheat setting of the expansion device should be sucient to ensure proper superheat levels during low loading periods. A minimum of 5 K stable superheat is required.

Head pressure control under low ambient conditions: Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure dierential between the suction and discharge pressures.

In air-cooled machines, cycling the fans with a head pressure controller will ensure that the fans remain o until the condensing pressure has reached a satisfactory level. Variable speed fans can also be used to control the condensing pressure. In water-cooled units, the same can be performed using a water regulator valve that is also operated by head pressure, thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level.

The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes.

Under very low ambient conditions, in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures, the use of a head pressure control valve is recommended. Note: This solution requires extra refrigerant charge, which can introduce other problems. A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line.

26 FRCC.PC.028.A5.02

For further information, please contact Danfoss.

Application Guidelines

Specic application recommendations

Sump heaters

Low load operation

Brazed plate heat exchangers

Sump heaters are strongly recommended on all systems where the compressor is exposed to low ambient temperatures, especially split and remote condenser installations. The sump heater

The compressors should be run for a minimum period in order to ensure that the oil has sucient time to properly return to the

A brazed plate heat exchanger needs very little internal volume to satisfy the set of heat transfer requirements. Consequently, the heat exchanger oers very little internal volume for the compressor to draw vapour from on the suction side. The compressor can then quickly enter into a vacuum condition. It is therefore important that the expansion device be sized correctly and that a sucient pressure dierential across the expansion device be available to ensure adequate refrigerant feed into the evaporator. This aspect is of special concern when operating the unit under low ambient and load conditions. For further information on these conditions, please refer to the previous sections.

will minimize refrigerant migration caused by the large temperature gradient between the compressor and the remainder of the system, please refer to section “Accessories”.

compressor sumps and that the motor has sucient time to cool under conditions of lowest refrigerant mass ows.

Due to the small volume of the brazed plate heat exchanger, no pump-down cycle is normally required. The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor.

When using a brazed plate condenser heat exchanger, a sucient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up. At least one meter of discharge line is necessary to generate this volume. To help reduce the gas volume immediately after start-up even further, the supply of cooling water to the heat exchanger may be opened before the compressor starts up so as to remove superheat and condense the incoming discharge gas more quickly.

Electronic expansion valve

Reversible heat pump systems

The use of an electronic expansion valve requires a specic compressor start / stop control.

A speciﬁc compressor start sequence control has to be set when an electronic expansion valve (EXV) is used. The sequence must be adjusted according to the EXV step motor speed to allow time for the EXV to open before the compressor starts to avoid running under vacuum conditions.

The EXV should be closed at compressor stop not to let refrigerant in liquid phase entering the

Transients are likely to occur in reversible heat pump systems, i.e. a changeover cycle from cooling to heating, defrost or low-load short cycles. These transient modes of operation may lead to liquid refrigerant carry-over (or ood back) or excessively wet refrigerant return conditions. As such, reversible cycle applications require specic precautions for ensuring a long compressor life and satisfactory operating characteristics. Regardless of the refrigerant

compressor. Ensure that the EXV closes when the supply voltage to the controller is interrupted (ie power cut o) by the use of a battery back up.

EXV Opened

Closed

Compressor On

O

charge in the system, specic tests for repetitive ood back are required to conrm whether or not a suction accumulator needs to be installed.

The following considerations cover the most important issues when dealing with common applications. Each application design however should be thoroughly tested to ensure acceptable operating characteristics.

27FRCC.PC.028.A5.02

Application Guidelines

Specic application recommendations

Sump heaters Sump heaters are mandatory on reversible

cycle applications given the high probability of liquid migration back to the compressor sump

Discharge temperature thermostat

Heat pumps frequently utilize high condensing temperatures in order to achieve a sucient temperature rise in the medium being heated. At the same time, they often require low evaporating pressures to obtain sucient temperature dierentials between the evaporator and the outside temperature. This situation may result in high discharge temperature; as such, it is mandatory that a discharge gas thermostat be installed on the discharge line to protect

Discharge line, reversing valve, solenoid valves

The Danfoss WSH scroll compressor is a high volumetric machine and, as such, can rapidly build up pressure in the discharge line if gas in the line becomes obstructed even for a very short period of time which situation may occur with slow-acting reversing valves in heat pumps. Discharge pressures exceeding the operating envelope may result in nuisance high-pressure switch cutouts and place excess strain on both the bearings and motor.

To prevent such occurrences, it is important that a 1-meter minimum discharge line length be allowed between the compressor discharge port and the reversing valve or any other restriction. This gives sucient free volume for the discharge gas to collect and to reduce the pressure peak during the time it takes for the valve to change position. At the same time, it is important that the selection and sizing of the reversing or 4-way valve ensure that the valve switches quickly enough to prevent against too high discharge pressure and nuisance high-pressure cutouts.

during o-cycles due to the outdoor location of most units and operations during low ambient conditions.

the compressor from excessive temperatures. Operating the compressor at too high discharge temperatures can result in mechanical damage to the compressor as well as thermal degradation of the compressor lubricating oil and a lack of sucient lubrication. The discharge gas thermostat should be set to shut down the compressor in the event discharge gas rises above 135°C.

Check with the valve manufacturer for optimal sizing and recommended mounting positions.

Additionally, in order to make a smooth transition when beginning and ending defrost , it is recommended to stop compressors when decide to move 4-way valve:

• rst stop compressors

• wait 10 seconds

• move the 4-way valve

• wait 10 seconds

• restart the compressors

In applications with heat recovery or condenser partialisation, servo piloted solenoid valve have to be properly sized or associated with a second small valve in parallel, in order to avoid quick discharge pressure drops when opening. This phenomenon could lead to hammering eects and create constraints on the non return valve integrated in discharge tting (SH180 to 380).

Compressors

O

Way valve

Position 1

Position 2

28 FRCC.PC.028.A5.02

start of defrost

sequence

<--------

--->

10 sec 10 sec 10 sec 10 sec

<--------

--->

end of defrost

sequence

<--------

--->

<--------

--->

Application Guidelines

Specic application recommendations

Defrost and reverse cycle The Danfoss WSH scroll compressor has the

ability to withstand a certain amount of liquid refrigerant dynamic slug. However we advise that

Suction line accumulator

Water utilizing systems

The use of a suction line accumulator is strongly recommended in reversible-cycle applications. This because of the possibility of a substantial quantity of liquid refrigerant remaining in the evaporator, which acts as a condenser during the heating cycle.

This liquid refrigerant can then return to the compressor, either ooding the sump with refrigerant or as a dynamic liquid slug when the cycle

Apart from residual moisture in the system after commissioning, water could also enter the refrigeration circuit during operation. Water in the system shall always be avoided. Not only because it can quickly lead to electrical failure, sludge in sump and corrosion but in particular because it can cause serious safety risks.

Common causes for water leaks are corrosion and freezing.

the system is unloaded to the minimum capacity step for defrost or when the cycle is reversed.

switches back to a defrost cycle or to normal cooling operations.

Sustained and repeated liquid slugging and ood back can seriously impair the oil’s ability to lubricate the compressor bearings. This situation can be observed in wet climates where it is necessary to frequently defrost the outdoor coil in an air source heat pump. In such cases a suction accumulator becomes mandatory.

Corrosion: Materials in the system shall be compliant with water and protected against corrosion.

Freezing: When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks. During o periods water inside heat exchangers could start freezing when ambient temperature is lower than 0°C. During on periods ice banking could occur when the circuit is running continuously at too low load. Both situations should be avoided by connecting a pressure and thermostat switch in the safety line.

29FRCC.PC.028.A5.02

Application Guidelines

Sound and vibration management

Starting sound level

Running sound level

During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running. WSH scroll compressors exhibit very little increased start-up transient sound. If a compressor is miswired,

compressor rotation is characterised by an objectionable sound. To correct reverse rotation, disconnect power and switch any two of the three power leads at the unit contactor. Never switch leads at the compressor terminals.

the compressor will run in reverse. Reverse

Compressor acoustic hoods have been developed to meet specic extra-low noise

incorporate sound proong materials and oer excellent high and low frequency attenuation.

requirements. The covers and bottom insulations

50 Hz 60 Hz

Model

WSH090 70 6 72 6 120Z0034

WSH105 71.5 6 74 6 120Z0035

WS H120 72.5 6 75 6 120Z0035

WSH140* 72.5 6 76 6 120Z0035

WSH161* 73.5 6 77 6 120Z0035

WSH184 75 6 78 6 120Z0135

Sound power and attenuation are given at condition of Te 4.9°C/Tc 38.4°C/SH5K/SC6K, measured in free space * For WSH140 code 3 and WSH161 code 3 use acoustic hood reference 120Z0135 (1) Attenuation given with acoustic hood only Materials are UL approved and RoHS compliant

Sound power

dB(A)

Attenuation

dB A (1)

Sound power

dB(A)

Attenuation

db A (1)

Acoustic hood

code number

Stopping sound level

Sound generation in a refrigeration or air conditioning system

WSH compressors are equipped with a discharge valve which closes at compressor shut down and thus prevents the compressor from running backwards. This reduces the stopping sound to a metallic click caused by the closing valve.

Typical sound and vibration in refrigeration and air conditioning systems encountered by design and service engineers may be broken down into the following three source categories.

Sound radiation: this generally takes an airborne path.

When the pressure dierence or gas ow at shut down should be very low, this can delay the discharge valve from closing and lead to a longer noise duration.

Mechanical vibrations: these generally extend along the parts of the unit and structure.

Gas pulsation: this tends to travel through the cooling medium, i.e. the refrigerant.

The following sections focus on the causes and methods of mitigation for each of the above sources.

30 FRCC.PC.028.A5.02

Application Guidelines

Sound and vibration management

Compressor sound radiation For sound radiating from the compressor, the

emission path is airborne and the sound waves are travelling directly from the machine in all directions.

The Danfoss WSH scroll compressor is designed to be quiet and the frequency of the sound generated is pushed into the higher ranges, which not only are easier to reduce but also do not generate the penetrating power of lowerfrequency sound.

Use of sound-insulation materials on the inside of unit panels is an eective means of substantially reducing the sound being transmitted to the outside. Ensure that no components capable of transmitting sound/vibration within the unit come into direct contact with any non-insulated parts on the walls of the unit.

Mechanical vibrations

Vibration isolation constitutes the primary method for controlling structural vibration. Danfoss WSH scroll compressors are designed to produce minimal vibration during operations. The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very eective in reducing vibration being transmitted from the compressor(s) to the unit. Once the supplied rubber grommets have been properly mounted, vibrations transmitted from the compressor base plate to the unit are held to a strict minimum. In addition, it is extremely important that the frame supporting the mounted compressor be of sucient mass and

Due to the Danfoss scroll’s unique design of a full-suction gas-cooled motor, compressor body insulation across its entire operating range is possible. Acoustic hoods are available from Danfoss as accessories. They have been developed to meet specic extra low noise requirements. They incorporate sound proong materials and oer excellent high and low frequency alternative.

These hoods are quick and easy to install and do not increase the overall size of the compressors to a great extend.

Refer to section “Running sound level” for sound attenuation and code numbers.

stiness to help dampen any residual vibration potentially transmitted to the frame. For further information on mounting requirements, please refer to the section on mounting assembly.

The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage. Tubing should also be designed for three-dimensional exibility. For more information on piping design, please see the section entitled “Essential piping design recommendations”.

Gas pulsation

The Danfoss WSH scroll compressor has been designed and tested to ensure that gas pulsation has been optimized for the most commonly encountered air conditioning pressure ratio. On heat pump installations and other installations where the pressure ratio lies beyond the typical range, testing should be conducted

under all expected conditions and operating congurations to ensure that minimum gas pulsation is present. If an unacceptable level is identied, a discharge muer with the appropriate resonant volume and mass should be installed. This information can be obtained from the component manufacturer.

31FRCC.PC.028.A5.02

Application Guidelines

Installation

Compressor handling and storage

Each WSH compressor is shipped with printed Instructions for installation. These instructions can also be downloaded from our website:

Each Danfoss WSH scroll compressor is equipped with two lift rings on the top shell. Always use both these rings when lifting the compressor. Use lifting equipment rated and certied for the weight of the compressor. A spreader bar rated for the weight of the compressor is highly recommended to ensure a better load distribution. The use of lifting hooks closed with a clasp and certied to lift the weight of the compressor is also highly recommended. Always respect the appropriate rules concerning lifting objects of the type and weight of these compressors. Maintain the compressor in an upright position during all handling manoeuvres (maximum of 15° from vertical).

Never use only one lifting lug to lift the compressor. The compressor is too heavy for the single lug to handle, and the risk is run that the lug could separate from the compressor with extensive damage and possible personal injury as a result.

www.danfoss.com or directly from: http://instructions.cc.danfoss.com

refrigerant and between -35°C and 70°C when charged with nitrogen.

When the compressor is mounted as part of an installation, never use the lift rings on the compressor to lift the installation. The risk is run that the lugs could separate from the compressor or that the compressor could separate from the base frame with extensive damage and possible personal injury as a result.

Never apply force to the terminal box with the intention of moving the compressor, as the force placed upon the terminal box can cause extensive damage to both the box and the components contained inside.

HEAVY

Compressor mounting

Mounting

Store the compressor not exposed to rain, corrosive or ammable atmosphere and between

do not lift manually

-35°C and 50°C when charged with R410A

Maximum inclination from the vertical plane while operating must not exceed 3 degrees.

Compressors WSH090-105-120-140-161-184 come delivered with four rubber mounting grommets and metal sleeve liners that serve to isolate the compressor from the base frame. These grommets must always be used to mount the compressor in a single application. The grommets must be compressed until contact between the at washer and the steel mounting sleeve is established. The grommets attenuate to a great extent the transmission of compressor vibrations to the base frame.

When a surface sump heater is used, it must be applied after the grommets are mounted on

The required bolt size for the WSH 090 -105-120140-161-184 compressors is HM8-40. This bolt must be tightened to a torque of 15 Nm.

HM 8 bolt

Lock washer

Flat washer

Steel mounting sleeve

Rubber grommet

Nut

compressor feet, in order to avoid surface sump heater damage.

15 mm

32 FRCC.PC.028.A5.02

Application Guidelines

Installation

Compressor holding charge

Each compressor is shipped with a nominal dry nitrogen holding charge between 0.3 and 0.7 bar and is sealed with elastomer plugs.

Before the suction and discharge plugs are removed, the nitrogen holding charge must be released via the suction schrader valve to avoid an oil mist blowout. Remove the suction plug

System cleanliness The refrigerant compression system, regardless

of the type of compressor used, will only provide high eciency and good reliability, along with a long operating life, if the system contains solely the refrigerant and oil it was designed for. Any other substances within the system will not improve performance and, in most cases, will be highly detrimental to system operations.

The presence of non-condensable substances and system contaminants such as metal shavings, solder and ux, have a negative impact on compressor service life. Many of these contaminants are small enough to pass through a mesh screen and can cause considerable damage within a bearing assembly.

The use of highly hygroscopic polyolester oil in R410A compressors requires that the oil be exposed to the atmosphere as little as possible.

rst and the discharge plug afterwards. The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture from entering the compressor. When the plugs are removed, it is essential to keep the compressor in an upright position so as to avoid oil spillage.

System contamination is one of main factors aecting equipment reliability and compressor service life. It is important therefore to take system cleanliness into account when assembling a refrigeration system.

During the manufacturing process, circuit contamination may be caused by:

• Brazing and welding oxides

• Filings and particles from the removal of burrs in pipe-work

• Brazing ux

• Moisture and air.

Consequently, when building equipment and assemblies, the precautions listed in the following paragraphs must be taken.

Tubing Only use clean and dehydrated refrigeration-

grade copper tubing. Tube-cutting must be carried out so as not to deform the tubing roundness and to ensure that no foreign debris remains within the tubing. Only refrigerant grade ttings should be used and these must be of

Brazing and soldering

Copper to copper connections

Dissimilar metals connection

Do not bend the compressor discharge or suction lines or force system piping into the compressor connections, because this will increase stresses that are a potential cause of failure. Recommended brazing procedures and material, are described section “Compressor connection”.

When brazing copper-to-copper connections, the use of copper/phosphorus brazing alloy containing 5% silver or more with a melting

When manipulating dissimilar metals such as copper and brass or steel, the use of silver solder (5% or more) and anti-oxidant ux is necessary.

both a design and size to allow for a minimum pressure drop through the completed assembly. Follow the brazing instructions on next pages. Never drill holes into parts of the pipe-work where lings and particles can not be removed.

These operations must be performed by a qualied personnel in compliance with all pertinent practices and safety procedures.

temperature of below 800°C is recommended. No ux is required during brazing.

Please contact Danrfoss Technical support for any deviation from this guidelines.

33FRCC.PC.028.A5.02

Application Guidelines

Installation

Compressor connection

When brazing the compressor ttings, do not overheat the compressor shell, which could severely damage certain internal components due to excessive heating. Use of a heat shield and/or a heat-absorbent compound is highly recommended. Due to the relatively sizable tubing and tting diameters a double-tipped torch using acetylene is recommended for brazing operation on Danfoss SH scroll compressors.

heat shield

For brazing the suction and discharge connections, the following procedure is advised:

.Make sure that no electrical wiring is connected

to the compressor.

.Protect the terminal box and compressor

painted surfaces from torch heat damage (see diagram).

.Remove the Teon gaskets when brazing

rotolock connectors with solder sleeves.

.Use only clean refrigeration-grade copper

tubing and clean all connections.

.Use brazing material with a minimum of 5%

silver content.

.Purge nitrogen or CO

through the compressor

in order to prevent against oxidation and ammable conditions. The compressor should not be exposed to the open air for extended periods.

.Use of a double-tipped torch is recommended. .Apply heat evenly to area A until the brazing

temperature is reached. Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well, and then begin adding the brazing material.

Move the torch evenly around the joint, in applying only enough brazing material to ow the full circumference of the joint.

.Move the torch to area C only long enough to

draw the brazing material into the joint, but not into the compressor.

.Remove all remaining ux once the joint has

been soldered with a wire brush or a wet cloth. Remaining ux would cause corrosion of the tubing.

In addition, for discharge connections equipped with a non return valve integrated in discharge tting (SH180 to SH380) the direction of the torch has to be as described on the picture, and maximum brazing time should be less thant two minutes to avoid NRVI damages.

Ensure that no ux is allowed to enter into the tubing or compressor. Flux is acidic and can cause substantial damage to the internal parts of the system and compressor.

The polyolester oil used in SH compressors is highly hygroscopic and will rapidly absorb moisture from the air. The compressor must therefore not be left open to the atmosphere for a long period of time. The compressor tting plugs shall be removed just before brazing the compressor. The compressor should always be the last component brazed into the system

Before eventual unbrazing the compressor or any system component, the refrigerant charge must be removed from both the high- and low-pressure sides. Failure to do so may result in serious personal injury. Pressure gauges must be used to ensure all pressures are at atmospheric level.

For more detailed information on the appropriate materials required for brazing or soldering, please contact the product manufacturer or distributor. For specic applications not covered herein, please contact Danfoss for further information.

System pressure test Always use an inert gas such as nitrogen for

pressure testing. Never use other gasses such as oxygen, dry air or acetylene as these may form

Maximum compressor test pressure (low side) 33.3 bar(g)

Maximum compressor test pressure (high side) 45 bar (g)

Maximum pressure dierence between high and low side of the compressor

34 FRCC.PC.028.A5.02

an inammable mixture. Do not exceed the following pressures:

37 bar

Application Guidelines

Installation

Leak detection

Vacuum evacuation and moisture removal

Pressurize the system on HP side rst then LP side to prevent rotation of the scroll. Never let the

Leak detection must be carried out using a mixture of nitrogen and refrigerant or nitrogen and helium, as indicated in the table below. Never use other gasses such as oxygen, dry air

Leak detection with refrigerant Leak detection with a mass spectrometer

Nitrogen and R410A Nitrogen and Helium

Note 1: Leak detection with refrigerant may be forbidden in some countries. Check local regulations. Note 2: The use of leak detecting additives is not recommended as they may aect the lubricant properties.

Moisture obstructs the proper functioning of the compressor and the refrigeration system.

Air and moisture reduce service life and increase condensing pressure, and cause excessively high discharge temperatures, which can destroy the lubricating properties of the oil. Air and moisture also increase the risk of acid formation, giving rise to copper platting. All these phenomena can cause mechanical and electrical compressor failure.

For these reasons it is important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly;

pressure on LP side exceed the pressure on HP side with more than 5 bar.

or acetylene as these may form an inammable mixture. Pressurize the system on HP side rst then LP side.

WSH compressors are delivered with < 100 ppm moisture level. The required moisture level in the circuit after vacuum dehydration must be < 100 ppm for systems with an SH.

• Never use the compressor to evacuate the system.

• Connect a vacuum pump to both the LP and HP sides.

• Evacuate the system to a pressure of 500 μm Hg (0.67 mbar) absolute.

Do not use a megohm meter nor apply power to the compressor while it is under vacuum as this may cause internal damage.

Filter driers A properly sized and type of drier is required.

Important selection criteria include the driers water content capacity, the system refrigeration capacity and the system refrigerant charge. The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD).

For new installations with WSH compressors with polyolester oil, Danfoss recommends using the Danfoss DML (100% molecular sieve) solid core lter drier. Molecular sieve lter driers with loose beads from third party suppliers shall be avoided. For servicing of existing installations where acid formation is present the Danfoss DCL (solid core) lter driers containing activated alumina are

recommended.

The drier is to be oversized rather than under sized. When selecting a drier, always take into account its capacity (water content capacity), the system refrigeration capacity and the system refrigerant charge.

After burn out, remove and replace the liquid line lter drier and install a Danfoss type DAS burnout drier of the appropriate capacity. Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line.

35FRCC.PC.028.A5.02

Application Guidelines

Installation

Refrigerant charging

Insulation resistance and dielectric strength

For the initial charge the compressor must not run and eventual service valves must be closed. Charge refrigerant as close as possible to the nominal system charge before starting the compressor. This initial charging operation must be done in liquid phase. The best location is on the liquid line between the condenser outlet and the lter drier. Then during commissioning, when needed, a complement of charge can be done in liquid phase: slowly throttling liquid in on the low pressure side as far away as possible from the compressor suction connection while compressor is running. The refrigerant charge

Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester.

Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration. Leakage current is less than 5mA.

WSH scroll compressors are congured with the pump assembly at the top of the shell, and the motor below. As a result, the motor can be partially immersed in refrigerant and oil. The presence of refrigerant around the motor windings will result in lower resistance

quantity must be suitable for both summer and winter operations. Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor. When servicing, always ensure that LP/HP pressures are balanced before starting the compressor. Be sure to follow all government regulations regarding refrigerant reclamation and storage. For more detailed information see “Recommended refrigerant system charging practice” news bulletin FRCC.EN.050.

values to ground and higher leakage current readings. Such readings do not indicate a faulty compressor.

In testing insulation resistance, Danfoss recommends that the system be rst operated briey to distribute refrigerant throughout the system. Following this brief operation, retest the compressor for insulation resistance or current leakage. Never reset a breaker or replace a fuse without rst checking for a ground fault (a short circuit to ground). Be alert for sounds of arcing inside the compressor.

Commissioning

Oil level checking and top-up

The system must be monitored after initial startup for a minimum of 60 minutes to ensure proper operating characteristics such as:

• Proper metering device operation and desired superheat readings

• Suction and discharge pressure are within acceptable levels

• Correct oil level in compressor sump indicating proper oil return

In installations with good oil return and line runs up to 20 m, no additional oil is required. If installation lines exceed 20 m, additional oil may be needed. 1 or 2% of the total system refrigerant charge (in weight) can be used to roughly dene the required oil top-up quantity but in any case the oil charge has to be adjusted based on the oil level in the compressor sight glass.

When the compressor is running under stabilized conditions the oil level must be visible in the sight glass. The presence of foam lling in the sight glass indicates large concentration of refrigerant in the oil and / or presence of liquid returning to the compressor.

• Low foaming in sight glass and compressor sump temperature 10K above saturation temperature to show that there is no refrigerant migration taking place

• Acceptable cycling rate of compressors, including duration of run times

• Current draw of individual compressors within acceptable values (max operating current)

• No abnormal vibrations and noise.

The oil level can also be checked a few minutes after the compressor stops. When the compressor is o, the level in the sight glass can be inuenced by the presence of refrigerant in the oil.

Always use original Danfoss POE oil 160SZ from new cans.

Top-up the oil while the compressor is idle. Use the schrader connector or any other accessible connector on the compressor suction line and a suitable pump. See News bulletin “Lubricants lling in instructions for Danfoss Commercial Compressors”.

36 FRCC.PC.028.A5.02

Application Guidelines

Packaging

Ordering information and packaging

Single pack

Compressor models

WSH090 565 470 718 69

WSH105 565 470 718 76

WS H120 565 470 718 76

WSH140 565 470 718 79

WSH161 565 470 718 81

WSH184 565 470 718 84

Length

(mm)

Width

(mm)

Height

(mm)

Gross

weight

(kg)

Industrial pack

Compressor models Nbr*

WSH090 8 1150 950 680 494 2

WSH105 8 115 0 950 750 544 2

WS H120 8 115 0 950 750 544 2

WSH140 8 115 0 950 750 566 2

WSH161 8 1150 950 750 582 2

WSH184 8 1150 950 750 606 2

* nbr: number of compressors per pack

Length

(mm)

Width

(mm)

Height

(mm)

Gross

weight

(kg)

Static

stacking

pallets

37FRCC.PC.028.A5.02

Application Guidelines

Ordering information and packaging

Ordering information

Single pack

Industrial pack

Danfoss WSH scroll compressors can be ordered in either industrial packs or in single packs. Please

Compressor model

WSH090 120H1012 120H1014 120 H1016 120H1018

WSH105 120H1020 120H1022 120H1024 120 H1026

WS H120 120 H1028 120H1030 120H1032 120 H1034

WSH140 120H1036 120H1038 120 H104 0 120H10 42

WSH161 120 H104 4 120H1046 120 H104 8 120H1050

WSH184 120H1052 120 H1054 120H1056 120H1058

Compressor model

WSH090 120H1013 120H1015 120 H1017 12 0H1019

WSH105 120 H1021 120H102 3 120H10 25 12 0H1027

WS H120 120 H1029 12 0H1031 120 H1033 120H1035

WSH140 12 0H1037 120 H1039 12 0H10 41 120 H1043

WSH161 120 H104 5 12 0H10 47 120 H1049 120 H1051

WSH184 120H1053 120 H1055 120H1057 120H1059

3 4 7 9

use the code numbers from below tables for ordering.

code no.

38 FRCC.PC.028.A5.02

Application Guidelines

Solder sleeve adapter set

Accessories

Typ e Code n° Description Application Packaging

120Z0125 Rotolock adaptor set (1"3/4 ~ 1"1/8) , (1"1/4 ~ 7/8") WSH090 Multipack 8

120Z0 405 Rotolock adaptor set (1"3/4 ~ 1"3/8) , (1"1/4 ~ 7/8") WSH105 to 184 Multipack 8

77650 06 * Rotolock adaptor set (1"3/4 ~ 1"3/8) , (1"1/4 ~ 7/8") WSH105 to 184 Multipack 6

* diameter restriction

Rotolock adapter

Typ e Code n° Description Application Packaging Pack size

120Z0367 Adaptor (1"1/4 Rotolock - 7/8" ODS) Models with 7/8" ODF Multipack 10

120Z0364 Adaptor (1"3/4 Rotolock - 1"1/8 ODS) Models with 1"1/8 ODF Multipack 10

120Z0 431 Adaptor (1"3/4 Rotolock - 1"3/8 ODS) Models with 1"3/8 ODF Multipack 10

Gaskets

Typ e Code n° Description Application Packaging Pack size

Pack

size

G09 8156131 Gasket, 1"1/4 Models with 1"1/4 rotolock connection Multipack 10

G09 7956002 Gasket, 1"1/4 Models with 1"1/4 rotolock connection Industry pack 50

G07 8156132 Gasket, 1"3/4 Models with 1"3/4 rotolock connection Multipack 10

G07 7956003 Gasket, 1"3/4 Models with 1"3/4 rotolock connection Industry pack 50

8156013 Gasket set 1"1/4 - 1"3/4 - 2"1/4, OSG gaskets black and white All Rotolock models Multipack 10

Solder sleeve

Typ e Code n° Description Application Packaging Pack size

P02 81530 04 Solder sleeve P02 (1"3/4 Rotolock - 1"1/8 ODF) Models with 1"3/4 rotolock connection Multipack 10

P02 7953005 Solder sleeve P02 (1"3/4 Rotolock - 1"1/8 ODF) Models with 1"3/4 rotolock connection Industry pack 50

P04 8153008 Solder sleeve P04 (1"1/4 Rotolock - 3/4" ODF) Models with 1"1/4 rotolock connection Multipack 10

P04 7953007 Solder sleeve P04 (1"1/4 Rotolock - 3/4" ODF) Models with 1"1/4 rotolock connection Industry pack 50

P05 8153012 Rotolock connector P05 (1"1/4 Rotolock - 7/8" ODF) Models with 1"1/4 rotolock connection Multipack 10

P05 7953008 Rotolock connector P05 (1"1/4 Rotolock - 7/8" ODF) Models with 1"1/4 rotolock connection Industry pack 50

P07 8153 013 Solder sleeve P07 (1"3/4 Rotolock - 7/8" ODF) Models with 1"3/4 rotolock connection Multipack 10

P07 7953010 Solder sleeve P07 (1"3/4 Rotolock - 7/8" ODF) Models with 1"3/4 rotolock connection Industry pack 50

P10 815300 3 Solder sleeve P10 (1"3/4 Rotolock - 1"3/8 ODF) Models with 1"3/4 rotolock connection Multipack 10

39FRCC.PC.028.A5.02

Application Guidelines

Rotolock nut

Accessories

Typ e Code n° Description Application Packaging

8153123 Rotolock nut, 1"1/4 Models with 1-1/4" rotolock connection Multipack 10

7953002 Rotolock nut, 1"1/4 Models with 1-1/4" rotolock connection Industry pack 50

8153124 Rotolock nut, 1"3/4 Models with 1-3/4" rotolock connection Multipack 10

7953003 Rotolock nut, 1"3/4 Models with 1-3/4" rotolock connection Industry pack 50

Rotolock service valve set

Typ e Code n° Description Application Packaging

7703008 Valve set, V02 (1"3/4 ~ 1"1/8), V05 (1"1/4 ~ 7/8") WSH090 Multipack 6

120Z0403 Valve set, V02 (1"3/4 ~ 1"1/8), V05 (1"1/4 ~ 7/8 ") WSH090 Multipack 8

7703392 Valve set, V10 (1"3/4 ~1"3/8), V05 (1"1/4 ~ 7/8") WSH105 to 184 Multipack 6

3-phase soft start equipment

Typ e Code n° Description Application Packaging

MCI 15 C 7705006 Electronic soft start kit, MCI 15 C WSH090 Single pack 1

MCI 25 C 7705007 Electronic soft star t kit, MCI 25 C WSH105 -120-14 0-161-18 4 Single pack 1

Pack

size

Pack

size

Pack

size

Surface sump heaters

Code no. Accessory description Application Packaging

120Z0388 80W 24V surface sump heater CE and UL

120Z0389 80W 230V surface sump heater CE and UL Multipack 8

120Z0390 80W 400V surface sump heater CE and UL Multipack 8

120Z0391 80W 460V surface sump heater CE and UL Multipack 8

120Z0 402 80W 575V surface sump heater CE and UL Multipack 8

WSH0 90-105 -120 -140-161-184

Multipack 8

Discharge temperature protection

Typ e Code No Description Application Packaging

7750009 Discharge thermostat kit All models Multipack 10

7973008 Discharge thermostat kit All models Industry pack 50

Pack

size

Pack

Size

40 FRCC.PC.028.A5.02

Application Guidelines

Mounting hardware

Accessories

Typ e Code No Description Application Packaging

120Z0 066

Mounting kit for scroll compressors. Grommets, sleeves, bolts, washers

WSH0 90-184 Single pack 1

Acoustic hoods

Typ e Code No Description Application Packaging

120Z0034 Acoustic hood for scroll compressor WSH090 Single pack 1

120Z0035 Acoustic hood for scroll compressor

120Z0135 Acoustic hood for scroll compressor WSH184-WSH161 code 3 -WSH140 code 3 Single pack 1

WSH105-120-140-161 (except WSH161 - 140 code

Single pack 1

Terminal boxes and accessories

Typ e Code No Description Application Packaging

120Z0 413 Terminal box cover WSH184-140 and 161 code 3 Single pack 1

8156135

8173021 T block connector 60 x 75 mm WSH140-3,161-3, 184 Multipack 10

Service kit for terminal box 96 x 115 mm, including 1 cover, 1 clamp

WSH0 90-105 -120 -140-161 (except WSH140-

3 and WSH161-3)

Multipack 10

Pack

Size

Pack

Size

Pack

Size

Lubricant

Typ e Code No Description Application Packaging

160SZ 7754023 POE lubricant, 1 litre can All models Single pack 1

160SZ 7754024 POE lubricant, 2 litre can All models Single pack 1

Miscellaneous

Typ e Code No Description Application Packaging

8156 019 Sight glass with gaskets (black and white) All models Multipack 4

8156129 Gasket for oil sight glass, 1"1/8 (white teon) All models Multipack 10

7956005 Gasket for oil sight glass, 1"1/8 (white teon) All models Multipack 50

81540 01 Danfoss Commercial Compressors blue spray paint All models Single pack 1

Pack Size

Pack

Size

41FRCC.PC.028.A5.02

Application Guidelines

Updates

Previous Version Current Version

• Page 12: Three phase electrical characteristics

• Page 16: Pressure equipment directive 97/23/ EC, Low voltage directive 2006/95/EC

• Page 26: Low ambient operations

• Page 36: Insulation resistance and dielectric strength: Leakage current is less than 0.5mA

• Page 12: Updated Motor voltage code3 (WSH105 model) in Three phase electrical characteristics

• Page 16: Pressure equipment directive 2014/68/EU, Low voltage directive 2014/35/EU

• Page 26: Updated Low ambient operations

• Page 36: Insulation resistance and dielectric strength: Leakage current is less than 5mA

42 FRCC.PC.028.A5.02

Danfoss Commercial Compressors

Danfoss Inverter Scrolls

is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications. With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs.

We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business, and positioned us as distinct variable speed technology specialists. Today we operate from engineering and manufacturing facilities spanning across three continents.

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Our products can be found in a variety of applications such as rooftops, chillers, residential air conditioners, heatpumps, coldrooms, supermarkets, milk tank cooling and industrial cooling processes.

http://cc.danfoss.com

Danfoss Commercial Compressors, BP 331, 01603 Trévoux Cedex, France | +334 74 00 28 29

Danfoss WSH090, WSH184 Application guide

Specifications and Main Features

Frequently Asked Questions

User Manual