Danfoss R22, R407C, R137a, R404A, R507A Application Manualline

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MAKING MODERN LIVING POSSIBLE

Application guidelines

Danfoss scroll compressors

SM - SY - SZ

R22 - R407C - R137a - R404A - R507A - 50 - 60 Hz

www.danfoss.us.com

Application guidelines

Content

Danfoss scroll compression principle .....................4

features ...............................................................5

compressor moDel Designation ...............................6

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

technical specifications .........................................7

50 Hz data ...............................................................................7

60 Hz data ...............................................................................8

Dimensions ...........................................................9

SM/SZ 084-090-100-110-120 ............................................9

SM 112-124-SM/SZ147* .................................................. 10

SM/SZ147 code 3 ............................................................... 10

SM/SZ 148-161 ................................................................... 11

SM/SZ 175-185 & SY185 .................................................. 12

SY/SZ 240-300-380 ............................................................13

Connection details ............................................................ 14

electrical Data, connections anD wiring .............. 15

Motor voltage ..................................................................... 15

Wiring connections ...........................................................15

IP rating ................................................................................. 16

Terminal box temperature .............................................17

Three phase electrical characteristics ........................ 17

Danfoss MCI soft-start controller ................................. 18

General wiring information ........................................... 19

Motor protection ............................................................... 21

Voltage unbalance ............................................................23

approval anD certifications ................................ 24

Approvals and certicates .............................................. 24

Pressure Equipment Directive 97/23/EC ...................24

Low voltage directive .......................................................24

Machines directives .......................................................... 24

Internal free volume ......................................................... 24

operating conDitions ......................................... 25

Refrigerant and lubricants..............................................25

Motor supply ....................................................................... 26

Compressor ambient temperature .............................26

Application envelope at dew temperatures ............26

Application envelopes at mean temperatures .......28

Discharge temperature protection ............................30

High and low pressure protection...............................30

Cycle rate limit ....................................................................31

system Design recommenDations .......................... 32

General .................................................................................. 32

Essential piping design considerations ..................... 32

Refrigerant charge limit .................................................. 33

O-cycle migration ........................................................... 33

Liquid ood back ............................................................... 35

specific application recommenDations .................. 36

Low ambient application ................................................ 36

Low load operations ......................................................... 37

Brazed plate heat exchangers .......................................37

Electronic expansion valve ............................................37

Reversible heat pump systems ..................................... 37

Water utilizing systems ....................................................39

sounD anD vibration management ........................ 40

Starting sound level..........................................................40

Running sound level ........................................................40

Stopping sound level ....................................................... 40

Sound generation in a refrigeration or air

conditioning system ......................................................... 40

installation ....................................................... 42

Compressor handling and storage..............................42

Compressor mounting .................................................... 42

Compressor holding charge .......................................... 43

System cleanliness ............................................................ 43

Tubing ....................................................................................43

Brazing and soldering ...................................................... 43

System pressure test ........................................................45

Leak detection .................................................................... 45

Vacuum evacuation and moisture removal .............45

Filter driers ........................................................................... 46

Refrigerant charging ........................................................ 46

Insulation resistance and dielectric strength .......... 46

Commissioning .................................................................. 47

Oil level checking and top-up ....................................... 47

orDering information & packaging ...................... 48

Packaging ............................................................................ 48

Ordering information ....................................................... 48

accessories ....................................................... 51

FRCC.PC.003.A5.22

Application guidelines

Danfoss scroll compression principle

In a Danfoss SM / SY / SZ 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.

First orbit:

SUCTION

Second orbit:

COMPRESSION

Third orbit:

DISCHARGE

SM SY SZ 084-09 0-100-110-120 -148-161-175-185-240-300-380

FRCC.PC.003.A5.22

Application guidelines

Features

In addition to the existing SM range compressors previously available, Danfoss is completing its range with 3 compressors.

The new SM112-124-147 and SZ147 compressors benet from a further improved design to achieve the highest eciency.

Gas circulation, motor cooling and oil behaviour are improved by a new patented motor cap design.

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

New PTFE spring seal for even lower leaks

R22 optimized scroll prole

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

Improved part isolation reduces greatly acoustic levels.

Gas intake design induces higher resistance to liquid slugging.

SM112-124 -147 an d SZ147

FRCC.PC.003.A5.22

Patented motor cap

Patented motor centering spacer

Improved lower bearing centering

Application guidelines

Compressor model designation

Danfoss scroll compressors are available both as single compressors and as tandem units. The example below presents the single compressor nomenclature which equals the technical reference as shown on the compressor nameplate.

Nomenclature

Family, lubricant

& refrigerant

SZ SY

Family, lubricant & refrigerant SM: Scroll, Mineral oil, R22/R417A*

SY: Scroll, POE lubricant, R22/R417A (and R407C for SY185-240-300) SZ: Scroll, POE lubricant, R407C - R134a (and R404A, R507A for SZ084 to SZ185)

Nominal capacity in thousand Btu/h at 60 Hz, R22, ARI conditions

Motor voltage code 3: 200-230V/3~/60 Hz 4: 380-400V/3~/50 - 460V/3~/60 Hz 6: 230V/3~/50 Hz 7: 500V/3~/50 Hz - 575V/3~/60 Hz 9: 380V/3~/60 Hz

* When SM compressors are used with R417A, the factory charged mineral oil 160P must be replaced by polyolester oil 160SZ

Nominal capacity

185 300

Voltage Version Evolution

Motor protection type

Internal overload protector

Internal thermostat

Electronic protection

4 7

module

V : brazed

C R : rotolock P : brazed X

S Y : rotolock

CA CB PA PB

CA C: brazed A: 24V AC CB

Code numbers for ordering list are section "Ordering information & packaging".

For tandem and trio assemblies, please refer to the Danfoss Parallel Application Guidelines documentation FRCC.PC.005.

index

Module voltageConnection

: brazed

24 V AC

: brazed

: rotolock

C: brazed

P: rotolock A: 24V AC

230 V

24 V AC 230 V

A: 24V AC B: 115/230V

B: 115/230V

Single compressors

Applies to

S 084-090-100-110-120-148-161

S 112-124-147

S 175-185

S 240 - 300

S 380

FRCC.PC.003.A5.22

Application guidelines

50 Hz data

Technical specications

Model

Nominal

Cap. 60 Hz

Nominal cooling capacity Power input COP E.E.R.

Swept

volume

Displace-

ment 

Oil

charge

TR W Btu/h kW W/W Btu/h /W cu.in/rev cu.ft/h oz lbs

SM084 7 20 400 69 600 6.12 3.33 11. 4 6.99 703 112.08 141

SM090 7.5 21 80 0 74 400 6.54 3.33 11. 4 7. 35 741 112.08 143

SM100 8 23 100 78 800 6.96 3.33 11.4 7.76 782 112. 08 143

SM 110 9 25 900 88 400 7.82 3. 32 11.3 8.80 886 112. 08 161

SM 112 9.5 27 600 94 200 7.92 3.49 11.9 9.25 931 112 .0 8 141

SM12 0 10 30 100 102 700 8.96 3.36 11. 5 10.17 1024 112 .0 8 161

SM124 10 31 200 106 500 8.75 3.56 12. 2 10.3 4 10 42 112.08 141

SM147 12 36 000 122 9 00 10.08 3.57 12. 2 11. 81 1190 112.08 148

SM14 8 12 36 100 123 200 10.8 3.34 11. 4 12.14 1222 12 2.26 194

R22 SINGLE

SM161 13 39 000 133 100 11. 59 3.37 11. 5 13.22 1331 122.2 6 194

SM175 14 42 000 143 300 12 .47 3.37 11. 5 14.22 1432 210.57 220

SM/SY185 15 45 500 155 30 0 13.62 3.34 11. 4 15. 25 1535 210.57 220

SY240 20 61 200 208 900 18. 2 3.36 11.5 21.22 2137 271.70 331

SY300 25 78 200 266 900 22.83 3.43 11. 7 26.70 2687 271.70 346

SY380 30 94 500 322 500 27.33 3.46 11. 8 32.42 3263 285.28 348

SZ084 7 19 300 65 900 6.13 3.15 10.8 6.99 703 112.0 8 141

SZ090 7.5 20 400 69 600 6.45 3.16 10.8 7. 35 741 112.08 143

SZ100 8 21 600 73 700 6.84 3.15 10.8 7. 76 782 112.08 143

SZ110 9 24 600 84 000 7.76 3 .17 10. 8 8.80 886 112.0 8 161

SZ120 10 28 600 97 600 8.99 3 .17 10. 8 10.17 1024 112.08 161

SZ147 12 34 900 119 100 9.92 3.52 12.0 11.81 1190 112.08 148

SZ148 12 35 100 119 80 0 10.99 3.19 10.9 12.14 1222 122.2 6 194

SZ161 13 37 900 129 700 11.84 3.21 11. 0 13.22 1331 12 2.26 194

R407C SINGLE

SZ175 14 40 100 136 9 00 12.67 3.17 10.8 14. 22 1432 210.57 220

SZ185 15 43 100 147 100 13.62 3.16 10.8 15. 25 1535 210.57 220

SZ240 20 59 100 201 700 18.55 3 .19 10.9 21.22 2137 271.70 331

SZ300 25 72 800 24 8 100 22.73 3.2 10.9 26.70 2687 271.70 346

SZ380 30 89 600 305 800 27. 59 3.25 11.1 32.42 3263 285.28 348

TR = Ton of Refrigeration COP = Coecient Of Performance EER = Energy Eciency Ratio  Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60Hz  Net weight with oil charge

Data given for code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: ww w.danfoss.com/ODSG

Net

weight 

Rating conditions

SM/SY compressors SZ compressors Refrigerant R22 R407C Frequency 50 Hz 50 Hz Standard rating conditions ARI standard conditions Evaporating temperature 45°F 45°F (dew point) Condensing temperature 130° F 130°F (dew point) Sub-cooling 15° F 15° F Superheat 20°F 20°F

Subject to modication without prior notication For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg

FRCC.PC.003.A5.22

Application guidelines

Technical specications

60 Hz data

Model

Nominal

Cap. 60 Hz

Nominal cooling capacity Power input COP E.E.R.

TR W Btu/h kW W/W Btu/h /W cu.in/rev cu.ft/h oz lbs

SM084 7 24600 84 000 7. 4 3.34 11. 4 6.99 849 110 141

SM090 7. 5 26 400 9 0 100 7. 8 3.37 11. 5 7. 35 894 110 143

SM100 8 27500 93 900 8.1 3.38 11. 5 7. 76 943 110 143

SM 110 9 3160 0 107 800 9. 3 3. 38 11. 5 8.80 1069 110 161

SM 112 9.5 34000 116 000 9.6 3.53 12.1 9.25 1124 112 141

SM12 0 10 36 700 12 5 300 10 .8 3.4 11.6 10.17 123 6 110 161

SM12 4 10.5 37 700 128 70 0 10. 6 3.56 12. 2 10.34 1257 112 14 2

SM147 12 43 600 148 800 12. 2 3.58 12. 2 11. 81 1435 112 148

SM14 8 12 43 800 149 500 13 3. 37 11.5 12.14 1476 122 194

R22 SINGLE

SM161 13 47 60 0 162500 14.1 3. 39 11.6 13.2 2 16 06 12 2 19 4

SM17 5 14 51 100 174 4 00 15.3 3.34 11.4 14 .22 1728 210 220

SM/ SY185 15 55 300 188 700 16.3 3.39 11 .6 15 .25 18 53 210 220

SY240 20 74 10 0 252 900 22.1 3.35 11. 4 21.22 2579 272 331

SY300 25 94 500 322 500 27. 5 3.43 11. 7 26.70 3245 272 346

SY380 30 115 300 393 500 33.4 3.46 11.8 32.42 3939 285 348

SZ084 7 22 500 76 800 7.1 3.19 10.9 6.99 849 110 141

SZ090 7.5 24 400 83 300 7.6 3.2 10.9 7.3 5 894 11 0 143

SZ100 8 26 500 90 400 8.2 3.24 11.1 7. 76 943 110 14 3

SZ110 9 30 100 102 700 9.3 3.24 11.1 8.80 10 69 11 0 161

SZ120 10 34 800 118 800 10.7 3.24 11.1 10.17 12 36 110 161

SZ147 12 42 300 144 300 12.03 3.52 12.0 11. 81 1435 112 148

SZ148 12 42 600 145 400 13.3 3.19 10.9 12.14 1476 12 2 19 4

SZ161 13 46 000 157 000 14.3 3.21 11.0 13 .22 1606 122 194

R407C SINGLE

SZ175 14 48 700 166 200 15.3 3.19 10.9 14.2 2 17 28 210 220

SZ185 15 51 800 176 800 16.4 3.15 10.8 15 .25 1853 210 220

SZ240 20 71 100 242 700 22.7 3.14 10.7 21. 22 2579 272 331

SZ300 25 87 900 300 000 27.5 3.2 10.9 26.70 3245 272 346

SZ380 30 107 300 366 200 33.5 3.2 10.9 32.42 3939 285 348

TR = Ton of Refrigeration COP = Coecient Of Performance EER = Energy Eciency Ratio  Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60Hz  Net weight with oil charge

Data given for code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: ww w.danfoss.com/ODSG

Swept

volume

Displace-

ment 

Oil

charge

Net

weight 

Rating conditions

SM/SY compressors SZ compressors Refrigerant R22 R407C Frequency 60 Hz 60 Hz Standard rating conditions ARI standard conditions Evaporating temperature 45°F 45°F (dew point) Condensing temperature 130° F 130°F (dew point) Sub-cooling 15° F 15° F Superheat 20°F 20°F

Subject to modication without prior notication For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg

FRCC.PC.003.A5.22

Application guidelines

SM/SZ 084-090-100-110-120

Dimensions

Ø 9.45

A: 18.29 B: 20.26

A: 20 B: 21.97

4 holes Ø 0.76

11.18

8.66

A: 9.92 B: 11.35

A: 5.59 B: 7.02

A: 6.42 B: 7.05

3.91

11.18

8.66

Ø 9.06

Ø 10

4.54

3.95

7.29

A: 15.02 B: 16.99

A: 11.60 B: 13.02

A: 6.17 B: 6.38

A: SM/SZ 084-090-100 B: SM/SZ 110-120

FRCC.PC.003.A5.22

30°

6.41

45°

Grommet

Steel mounting sleeve

Rubber grommet

3.89

HM 8 bolt

Lock washer

Flat washer

Nut

All dimensions in inch

Compressor base plate

1.10 inch

B: SM124-147

Application guidelines

Dimensions

SM 112-124 -SM/SZ147*

* except code 3

A: 21.06 B: 21.26

4.61

10.94

7.44

4 holes Ø 0.75

30 °

Ø 8.80

Ø 8.69

Ø 9.57

9.06

7.5

A: 10.84 B: 20.04

3.98

6.18

6.06

4 holes Ø 0.75

SM/SZ147 code 3

Ø 8.82

Ø 9.57

21.26

20.04

10.94

3.98

9.06

7.5

30°

9.06

60 °

7.5

A: SM112

30 °

6.06

6.81

7.09

9.06

60°

7.5

30°

Grommet

HM 8 bolt

Lock washer

Flat washer

Steel mounting sleeve

Rubber grommet

Nut

7.87

6.06

6.81

All dimensions in inch

Compressor base plate

1.10 inch

FRCC.PC.003.A5.22

Application guidelines

Dimensions

SM /SZ 148-161

7.79

7.87

3.92

SM 148-161 code 3 SM 148-161 code 4

Ø 10.47

Ø10.47

14.79

23.27

17.33

7.09

4.54

10.65

3.92

30°

7.32

6.8

8.66

11.18

6.24

8.23

4 holes Ø 0.76

8.66

11.18

14.08

3.89

Grommet

Lock washer

Flat washer

Steel mounting sleeve

Rubber grommet

HM 8 bolt

13.03

7.36

All dimensions in inch

Compressor base plate

1.10 inch

FRCC.PC.003.A5.22

Nut

Application guidelines

Dimensions

SM/SZ 175-185 & SY185

20.81

Brazed version Rotolock version

Ø 10.47

Ø 10.08

26.69

7.80

Ø 12.45

9.34

7.09

4.33

25.25

9.39

7.76

7.09

7.67

30°

6.74

7.32

13.60

7.36

4 holes Ø 0.76

14.60

16.91

Grommet

HM 8 bolt

Lock washer

Flat washer

6.57

7.96

All dimensions in inch

Compressor base plate

Steel mounting sleeve

Rubber grommet

Nut

FRCC.PC.003.A5.22

1.10 inch

Application guidelines

Dimensions

SY/SZ 240-300-380

Brazed version Rotolock version

Ø13.54

Discharge 1”1/8

Discharge A&B: 1”1/8 C: 1”3/8

Ø13.54

A: 27.2±2 B: 67.63±2 C: 28.58

A: 24.33 B: 24.76 C: 25.71

15.43

Suction A&B: 1”5/8 C: 2”1/8

7.7

7.95

90°

15.43

11.58

7.62

8.11

A&B: 15.83 - C: 16.54

8.23

30°

35°

5.5

7.32

3.43

Ø13.11

6.29

3.86

4 holes Ø0.98

17.87

7.36

A: 18.88±1.2 B: 19.31±1.2 C: 20.26±1.2

8.50

A: SY/SZ240 B: SY/SZ300 C: SY/SZ380

A: 27.2±2 B: 67.63±2

A: 24.33 B: 24.76

15.43

A: SY/SZ240 B: SY/SZ300

15.91

187

8.50

Suction A: 1”1/2 B: 1”5/8

7.7

Ø13.11

A: 18.88±1.2 B: 19.31±1.2

6.29

3.86

3.43

15.43

11.58

30°

7.62

7.95

8.19

90°

15.90

7.32

35°

5.5

8.23

4 holes Ø0.98

17.87

FRCC.PC.003.A5.22

Grommet

Lock washer *

Large ﬂat *

1.06 inch washer

Steel mounting sleeve

Rubber grommet

* not supplied with compressor

All dimensions in inch

HM 10 Bolt *

Compressor base plate

1.41 inch

Nut *

Application guidelines

Dimensions

Connection details

Model

Version V K-R-S -W-Y C-J-P-U-X AL MA - MB AA - AB AA - AB

Suction and discharge connection brazed rotolock brazed brazed rotolock brazed brazed

Oil sight glass threaded threaded threaded threaded threaded threaded threaded

Oil equalisation connection 3/8’’ are 3/8’’ are 3/8’’ are rotolock 1"3/4 1/2’’ are 1/2’’ are 1/2’’ are

Oil drain connection - 1/4’’ are 1/4’’ are - 1/4’’ are 1/4’’ are 1/4’’ are

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

SM/SZ084-090-100-110-

120 -148-161

SM/SZ 175 - SM/SZ/SY185

SM 112-124 -

SM/SZ 147

SY/SZ 240 - 300 S Y/SZ 38 0

Suction and discharge connections

Oil sight glass

Oil equalisation connection

Brazed version Rotolock version

Brazed Rotolock Sleeve included

SM/SZ 084-090-100

SM/SZ 110-112-120124-147-SM148&161

SM/SZ 175-185

SY/SZ 240-300

SY/SZ 380

Suction 1’’ 1/8 - -

Discharge 3/4’’ - -

Suction 1’’ 3/8 - -

Discharge 7/8’’ - -

Suction 1’’ 5/8 2’’ 1/4 1’’ 3/8

Discharge 1’’ 1/8 1’’ 3/4 7/8’’

Suction 1’’ 5/8 2’’ 1/4 1’’ 5/8

Discharge 1’’ 1/8 1’’ 3/4 1’’ 1/8

Suction 2’’ 1/8 - -

Discharge 1’’ 3/8 - -

All Danfoss SM / SY / SZ 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.

SM/SZ 112-124-147: 1"3/4 rotolock connector allowing use of 1"3/4-7/8" or 1"3/4-1"1/8 SY/SZ240-300-380: 1/2" are Other models: 3/8" are This connection must be used to mount an oil equalisation line when two or more compressors are mounted in parallel (please refer to Danfoss Parallel Application Guide lines reference FRCC.PC.005 for details).

Oil drain connection

Schrader

The oil drain connection allows oil to be removed from the sump for changing, testing, etc. The tting contains an extension tube into the oil sump to more eectively remove the oil. The connection is a female 1/4" are tting. Note: on SY/SZ 240 to 380, it is not possible to drain oil from the suction connection.

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

FRCC.PC.003.A5.22

Application guidelines

Electrical data, connections and wiring

Motor voltage

Wiring connections

SM / SZ 084 - 090 - 100 - 110 - 112

- 120 - 124 - 147* -148* - 161*

*Except for motor voltage code 3

Danfoss SM / SY / SZ scroll compressors are available in ve dierent motor voltages.

Nominal voltage

Voltage range

Nominal voltage

Voltage range

50 Hz

60 Hz

50 Hz

60 Hz

Motor voltage

code 3

- 380-400 V - 3 ph 500 V - 3 ph -

- 340-440 V 450 - 550 V -

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

180 - 253 V 414 - 506 V 517 - 632 V 342 - 418 V

Motor voltage

code 4

Motor voltage

code 7

Motor voltage

code 9

Electrical power is connected to the compressor terminals by Ø 3/16” (4.8 mm) screws. The maximum tightening torque is 2.2ft.lb. Use a 1/4’’ ring terminal on the power leads.

The terminal box is provided with a Ø 1" and a Ø 1.14" knockouts.

Ø 1.14 inch knockout

Power supply

Terminal box

Ø 1 inch knockout

SM/SZ 147 code 3

SM / SZ 148 & 161 code 3-175185 & SY185 - R & C version

The terminal box is provided with a Ø 1.59" hole for power supply and a Ø 0.65" knockout.

The terminal box is provided with 2 double knockouts for the power supply and 3 knockouts for the safety control circuit. The 2 power supply, double knockouts accommodate the following diameters:

Ø 1”3/4 hole (for a 1”1/4 conduit) and Ø 1”3/8 hole (for a 1” conduit), Ø 1.26” hole & Ø 1” hole

The 3 other knockouts are as follows:

Ø 0.81” Ø 7/8” (for a 1/2” conduit) Ø 0.65”

Ø 0.65” knockout

Cover holding screw (x2) - Torque: 1.6 ft.lb

Faston 1/4" tabs

Power supply

Ø 1.59” hole

Power supply

Terminal box

Sump heater

FRCC.PC.003.A5.22

Internal control contact

connection

Application guidelines

Electrical data, connections and wiring

SM/SZ 175-185 - J, K, P, S, U, W, X, Y versions

The terminal box is provided with 2 double knockouts for the power supply and 3 knockouts for the safety control circuit. The 2 power supply, double knockouts accommodate the following diameters:

Ø 1”3/4 hole (for a 1”1/4 conduit) and Ø1”3/8 hole (for a 1” conduit) Ø1.26” hole & Ø1” hole

The 3 other knockouts are as follows:

Ø 0.81”, Ø 7/8” (for a 1/2” conduit) and Ø 0.65”

The motor protection module comes preinstalled within the terminal box and has pre-wired thermistor connections. The module must be connected to a power supply of the appropriate voltage. The module terminals are

0.25" size Faston type except for 24V DC module (screw connection).

SY/SZ 240 – 300 – 380 The terminal box is provided with 2 triple

knockouts and 1 single knockout for power supply and 4 double knockouts for the safety control circuit. The 3 power supply knockouts accommodate the following diameters:

• Ø 2 inch (UL 1"1/2 conduit) & Ø 1.72 inch (UL 1"1/4 conduit) & Ø 1.36 inch (UL 1" conduit)

• Ø 1.59 inch (ISO40) & Ø 1.27 inch (ISO32) & Ø 1 inch (ISO25)

• Ø 1 inch (ISO25)

The 4 others knockouts are as follows:

• Ø 0.89 inch (PG16) (UL 1/2") & Ø 0.65 inch (ISO16) (x2)

• 0.81 inch (ISO20 or PG13.5) (x2)

Cover holding screw (x2) - Torque: 1.6 ft.lb

Terminal box

Motor Protection

Module

1 2 12 14 11

Faston 1/4" tabs

Power supply

Safety circuit Protection module power supply

Sump heater

LN12 1412 11

Module power

Black

Faston 1/4” tabs

Power supply

Blue

Brown

Thermistor

M1 - M2 Control circuit

}

Safety circuit

Module power supply

Sump heater

IP rating

The motor protection module comes preinstalled within the terminal box. Phase sequence protection connections and thermistor connections are pre-wired. The module must be connected to a power supply of the appropriate voltage. The module terminals are 0.25" size Faston type.

Phase sequence input

L1 L2 L3

Black Blue Brown

Internal control contact

LNS1 S2 M1 M2

Thermistor

Module power

connection

Safety circuit

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.

FRCC.PC.003.A5.22

Application guidelines

Electrical data, connections and wiring

Terminal box temperature

The temperature inside the terminal box may not exceed 158°F. 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

Three phase electrical characteristics

Compressor model

SM/SZ084 170 35 35 0.44 SM/SZ090 195 35 34 0.38 SM/ SZ100 195 38 32 0.38

SM /S Z110 2 37 45 40 0.26

SM 112 267 51 41 0.27

Motor voltage code 3

200-230V/3 ph /60 Hz

Motor voltage code 4

380- 400V/3 ph/50 Hz

460V/3 ph/60 Hz

Motor voltage code 7

500V/3 ph/50 Hz

575V/3 ph/60 Hz

Motor voltage code 9

380V/3 ph/60 Hz

* For versions with electronic module, see datasheet for electrical data

LRA (Locked Rotor Amp)

SM/SZ120 2 37 50 48 0.26 SM /SZ12 4 267 51 45 0. 27 SM/SZ14 7 304 57 52 0.24

SM/SZ14 8 255 64 57 0.29

SM/SZ161 2 55 64 61 0.29 SM /SZ175 * 380 75 70 0 .19 SM/SZ185 * 380 75 73 0.19

SY/ SZ24 0 460 109 100 0.14

SY/ SZ30 0 560 13 0 13 0 0.12

SM/SZ084 86 17 17 1.74 SM/SZ090 98 18. 5 17 1.48 SM/ SZ100 98 19 18 1.4 8

SM /S Z110 130 22 20 1.05

SM /S Z112 142 25 21 1.0 5

SM/SZ120 130 29 24 1.05

SM /SZ12 4 142 25 23 1. 05

SM/SZ14 7 147 29 26 0.92

SM/SZ14 8 145 32 29 0.94

SM/SZ161 145 32 31 0.94 SM /SZ175 * 175 35 34 0.77 SM/SZ185 * 175 35 35 0.77

SY/ SZ185 175 35 34 0.77 SY/ SZ24 0 215 50 47 0.62 SY/ SZ30 0 270 69 58 0. 52 SY/SZ380 300 79 69 0.46

SM/SZ084 70 13 13 2.58 SM/SZ090 80 14 13 2.25 SM/ SZ100 80 15 13 2.25

SM /S Z110 85 18 16 1.5 7 SM/SZ120 85 19 18 1. 57

SM/SZ14 8 102 27 23 1.61

SM/SZ161 102 25 24 1. 61

SM /SZ175 * 140 28 27 1 .11 SM/SZ185 * 14 0 28 28 1.11

SY/ SZ24 0 180 40 39 0.9 4 SY/ SZ30 0 210 49 49 0.80

SM/SZ084 100 20 20 1.22 SM/SZ090 113 22 20 1.05 SM/ SZ100 113 22 19 1.05

SM /S Z110 160 27 23 0.72 SM /S Z112 177 32 24 0.72 SM/SZ120 16 0 30 28 0.72 SM /SZ12 4 177 32 27 0.72 SM/SZ14 7 181 35 31 0.62

SM/SZ14 8 155 38 36 0.75

SM/SZ161 155 38 38 0 .75

SM /SZ175 * 235 43 42 0.48 SM/SZ185 * 235 43 43 0.48

SY/ SZ24 0 260 62 62 0.42 SY/ SZ30 0 305 74 74 0.36

Locked Rotor Amp value is the higher current as

LRA MCC MMT Max . op. current Winding resistance

A A A A Ω

measured on mechanically blocked compressor tested under nominal voltage. The LRA value can be used as rough estimation for the starting

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 158°F.

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

FRCC.PC.003.A5.22

Application guidelines

Electrical data, connections and wiring

MMT (Max Must Trip current)

MCC (Maximum Continuous Current)

Max. operating Current

Winding resistance

The MMT is dened for compressors without their own motor protection. This MMT value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope. The tripping current

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

The max. operating current is the current when the compressors operates at maximum load conditions and 10% below the highest value of its nominal voltage (59°F evaporating temperature and 154.4°F condensing temperature).

Winding resistance is the resistance between indicated terminal pins at 77°F (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 77°F, the measured resistance must be corrected with following formula:

of external overcurrent protection (thermal overload relay or circuit breaker not provided with compressor) must never exceed the MMT value.

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.

a + t R

= R

amb

77°F

a + t t

: reference temperature = 77°F

77°F

: temperature during measurement (°F)

amb

: winding resistance at 77°F

77°F

: winding resistance at t

amb

77°F

amb

Coecient a = 234.5

Danfoss MCI soft-start controller

The inrush current for the Danfoss scroll compressors with motor code 4 (400V / 3 / 50Hz or 460V / 3 / 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; MCI soft starters can reduce the in-rush current by up to 40%, thereby eliminating the detrimental

Compressor model

SM / SZ 084 SM / SZ 090 SM / SZ 100 SM / SZ 110 SM / SZ 120 SM 112-124 - SM/SZ147 SM / SZ 161 - 148 SM / SZ 175 - 185 SY / SZ 240 - 300 - 380 MCI 50CM *

* By-pass contactor (K1) required.

FRCC.PC.003.A5.22

Soft start reference

ambient max. 104°F

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.

MCI 15 C

MCI 25C MCI 25C*

Soft start reference ambient max. 131°F

MCI 15 C

MCI 25C

CONTROL CIRCUIT

Application guidelines

Electrical data, connections and wiring

Input controlled soft start

MCI with bypass contactor

General wiring information

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 bypass function is easily achieved, see wiring diagram below.

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).

The wiring diagrams below are examples for a safe and reliable compressor wiring. In case an alternative wiring logic is chosen, it's 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

13-14 contact not applicable with MCI 25C

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 are indicated section “Operating conditions”. When ever possible (ie. 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.

Suggested wiring diagrams logic

Compressor models SM / SZ 084 - 090 - 100 - 110 - 112 - 120 - 124 - 147 - 148 - 161

L1 L3 L2

F1F1

KA KA

180 s

LLSV KS

Wiring diagram with pump-down cycle

FRCC.PC.003.A5.22

LPS

DGT

CONTROL CIRCUIT

F1F1

KA KA

KM KA

KA KS

180 s

LPS

DGT

Wiring diagram without pump-down cycle

L1 L3 L2

85 52 019 - A

Application guidelines

Electrical data, connections and wiring

Compressor models SM / SZ 175 – 185 R and C version

CONTROL CIRCUIT

KA KAKA

180s

LLSV

L1 L3 L2

LPS

DGT

ThM

CONTROL CIRCUIT

KAKAKA

LPS

180s

DGT

L1 L3 L2

ThM

Wiring diagram with pump-down cycle

Compressor models SM/SZ175-185 (J, K, P, S, U, W, X, Y versions)

Wiring diagram with pump-down cycle

LPS

MPM

Compressor models SY / SZ 240 - 300 - 380

LPS

MPM

Wiring diagram without pump-down cycle

LPS

MPM

Wiring diagram without pump-down cycle

LPS

MPM

Legends

Wiring diagram with pump-down cycle

Fuses F1 Compressor contactor KM Control relay KA Safety lo ck out relay KS Optional sho rt cycle timer (3 min) 180 s Extern al overload protection F2 Pump-d own pressure switch LP High pressure sa fety switch HP Control device TH

FRCC.PC.003.A5.22

Wiring diagram without pump-down cycle

Liquid Line Solenoid valve LLSV Discharge gas th ermostat DGT Fused disconnect Q1 Motor safety thermostat thM Compressor motor M Motor Protecti on Module MPM Thermistor chain S Safety p ressure switch LPS

Application guidelines

Motor protection The table below shows the protection method for the various compressors models.

SM/SZ 115-125-16 0-175-18 5

R & C version

SM 112- 124-147 Internal motor protection Phase sequence detector

SM/SZ 084 -09 0-10 0-110-120-14 8-

161 - SZ147

SM /SZ175-185

J-K-P-S-U-W-X-Y version

SY/SZ 240-300 -380 Electronic module located in terminal box

Electrical data, connections and wiring

Overheating protection Over current protection Locked rotor protection Phase reversal protection

Internal thermostat External overload protection Reverse vent.



REQ



Internal motor protection Reverse vent.



Electronic module located in terminal box Reverse vent.



REC

 



Recommended Required No test or additional safeties required

REQREC



Compressor models SM/SZ084 - 090 - 100 110 - 112 - 120 - 124 - 147 - 148 - 161 have been provided with an internal overload motor protection to prevent against excessive current and temperature caused by overloading, low refrigerant ow phase loss or incorrect motor rotation. The cutout current is the MCC value listed in section "Three phase electrical characteristics". 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.

Compressor models SM/SZ175 - 185 R & C versions have been provided with a bimetallic

single-pole, single-throw thermostat located in the motor windings. In the event of motor overheating caused by low refrigerant ow or improper motor rotation, the thermostat will open. Because the thermostat is an automatic reset device, it must be wired within a lockout safety circuit with a manual reset to restart the unit. For over-current and phase loss protection, an external overload protector must be used.

The external overload protector can be either a thermal overload relay or a circuit breaker:

A thermal overload relay should be set to trip at not more than 140% of the compressor-rated load current.

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

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

A circuit breaker, on the other hand, should be set at not more than 125% of the compressor rated load current. The rated load current is the maximum current expected during operations of the considered application.

Further requirements for the external overload protector are:

• Over-current protection: the protector must

trip within 2 minutes at 110% of the Maximum Must-Trip current (MMT).

• Locked rotor protection: the protector must

trip within 10 seconds upon starting at a locked rotor current (LRA).

• Single-phasing protection: the protector

must trip when one of the three phases fails.

Compressor models SY/SZ 240 - 300 - 380 and SM/SZ115-125-160-175-185 J, K, P, S, U, W, X, Y versions are delivered with a pre-

installed motor protection module inside the terminal box. This device provides for ecient and reliable protection against overheating and overloading (as well as phase loss/reversal for SY/ SZ 240-300-380).

FRCC.PC.003.A5.22

The motor protector comprises a control module and PTC sensors embedded in the motor winding. The close contact between thermistors and windings ensures a very low level of thermal inertia. The motor temperature is being constantly measured by a PTC thermistor loop connected on S1-S2 (called 1-2 on SM/ SZ115-125 -160-175-185).

Application guidelines

Electrical data, connections and wiring

Phase sequence and reverse rotation protection

If any thermistor exceeds its response temperature, its resistance increases above the trip level (4,500 Ω) and the output relay then trips -ie. contacts M1-M2 (or 11-14 for SM/ SZ175-185) are open. After cooling to below the response temperature (resistance < 2,750 Ω), a 5 minute time delay is activated. After this delay has elapsed, the relay is once again pulled in ie. contacts M1-M2 (11-14 for SM/SZ175-185) are closed. The time delay may be cancelled by means of resetting the mains (L-N disconnect) for approximately 5 sec.

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 compressor will only operate properly in a single

Compressor model SM112-124-147 have no internal reverse rotation protection. If reverse rotation occurs it will be obvious as soon as power is turned on. The compressor will not build-up any pressure, the sound level will be abnormally high and power consumption will be minimal. In such case, shut down the compressor

A red/green twin LED is visible on the module. A solid green LED denotes a fault free condition. A blinking red LED indicates an identiable fault condition:

PTC overheat

Appr. 1 second

Delay timer active (after PTC overheat)

Appr. 1 second

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

immediately and connect the phases to their proper terminals. Prolonged reverse rotation will damage the compressor.

A phase sequence detector is strongly

recommended.

Compressor models SM / SZ 084 to 185 (except SM112-124 & 147) incorporate an internal reverse vent valve which will react in the presence of reverse rotation and will allow refrigerant to circulate through a by-pass from the suction to the discharge. Although reverse rotation is not destructive, even over long periods of time up to several days it should be corrected as soon as possible. Reverse rotation will be obvious

Compressor models SY / SZ 240 to 380 are delivered with an electronic module which provides protection against phase reversal and loss at start-up. Apply the recommended wiring diagrams. The circuit should be thoroughly checked in order to determine the cause of the phase problem before re-energizing the control circuit. The phase sequencing and phase loss monitoring functions are active during a 5 sec. window 1 sec. after compressor start-up (power on L1-L2-L3).

to the user as soon as power is turned on; the compressor will not build up any 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 internal motor protection.

Should one of these parameters be incorrect, the relay would lock out (contact M1-M2 open). The red led on the module will show the following blink code:

In case of phase reverse error:

Appro. 1 second

In case of phase loss error:

Appro. 1 second

FRCC.PC.003.A5.22

Application guidelines

Electrical data, connections and wiring

Voltage unbalance

Compressor

Phase monitoring

Phase sequence module logic

start

0 1 s 6 s

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

unbalance

Vavg = Mean voltage of phases 1, 2, 3. V1-2 = Voltage between phases 1 & 2.

The lockout may be cancelled by resetting the power mains (disconnect L-N) for approximately 5 sec.

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

x 100

2 x Vavg

V1-3 = Voltage between phases 1 & 3.

V2-3 = Voltage between phases 2 & 3.

FRCC.PC.003.A5.22

Application guidelines

Approval and certications

Approvals and certicates

Pressure Equipment Directive 97/23/EC

Low voltage directive

2006/95/EC

SM / SY / SZ 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 SM084 to 185 SZ084 to 185 & SY185 SY/SZ 240 to 380

Refrigerating uids Group 2 Group 2 Group 2

Category PED II II II

Evaluation module D1 D1 D1

Service temperature - Ts -31°F < Ts < 145°F -31°F < Ts < 127°F -31°F < Ts < 127°F

Service pressure - Ps 368 psig 363 psig 290 psig

Declaration of conformity ref Pressure Equipment Directive 97/23/EC

Products SM/SZ084 to SY/SZ380

Declaration of conformity ref. Low voltage Directive 2006/95/EC

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

SM / SY / SZ models

All

All 60 Hz

SM / SY / SZ models

Contact Danfoss

Machines directives

2006/42/EC

Internal free volume

Products SM/SZ084 to SY/SZ380

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

Products Internal free volume without oil (in3)

SM/SZ084 - 090 - 100 860 SM/SZ 110 - 120 897 SM 112 - 124 - SM/SZ 147 872 SM/SZ 14 8-161 119 6 SM/SZ 175 - 185 and SY185 2014 SY/SZ 240 - 300 2307 SY/ SZ 380 2392

Contact Danfoss

FRCC.PC.003.A5.22

Application guidelines

Operating conditions

Refrigerant and lubricants

General information

R22

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 & guidelines

R22 is an HCFC refrigerant and is still a wide use today. It has a low ODP (Ozone Depletion Potential). Starting from 1st January 2010, the use of virgin R22 refrigerant is no longer allowed in the European Union. Refer to FRCC.EN.049 for R22 retrot recommendations.

• 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

When R22 is applied in refrigeration applications it can lead to high discharge temperature. Carefully check all other parameters that can inuence the discharge temperature.

R407C

R134 a

R404A

R507

Mineral oil

R407C is an HFC refrigerant and has a zero ozone depletion potential (ODP=0) R407C is a zeotropic mixture and has a temperature glide of 45.3°F

R134a is an HFC refrigerant and has zero ozone depletion potential (ODP = 0). R134a is a pure refrigerant and has zero temperature glide. For

R404A is an HFC refrigerant and has zero ozone depletion potential (ODP = 0). R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications. R404A is a mixture and has a very

R507 is an HFC refrigerant with properties comparable to R404A. R507 has no ozone depletion potential (ODP = 0). As with R404A, R507 is particularly suitable for low evaporating

Mineral oil can be applied in system using HCFC's refrigerant because it has a good miscibility with HCFC and oil that leave the compressor with refrigerant may not be trapped in lines or

but has a superior thermodynamic properties compared to R22.

applications with high evaporating and high condensing temperatures, R134a is the ideal choice.

small temperature glide, and therefore must be charged in its liquid phase, but for most other aspects this small glide can be neglected. Because of the small glide, R404A is often called a near-azeotropic mixture.

temperature applications but it can also be used for medium evaporating temperature applications. R507 is an azeotropic mixture with no temperature glide.

exchangers. The chlorine contained in HCFC's improves lubricity in bearings used with mineral oil. Mineral oil has a very low hygroscopicity but may chemically react with water and form acids.

POE oil

Polyol Ester Oil (POE) is miscible with HFC's (while mineral oil is not), but has to be evaluated regarding lubricate ability in compressors. POE oil has better thermal stability than

FRCC.PC.003.A5.22

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

Application guidelines

Operating conditions

Motor supply SM / SY / SZ scroll compressors can be operated

at nominal voltages as indicated on page 18. Under-voltage and over-voltage operation is

Compressor ambient temperature

SM / SY / SZ compressors can be applied from

-31°F to 145.4°F (for SM/SZ084 to 185) and 127.4°F (for SY/SZ 240 to 380) ambient temperature. The compressors are designed as 100 % suction gas

High ambient temperature

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

Low ambient temperature

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

Application envelope at dew temperatures

The operating envelopes for SM / SY / SZ scroll compressors are given in the gures below, where the condensing and evaporating temperatures represent the range for steadystate operation. Under transient conditions, such as start-up and defrost, the compressor may operate outside this envelope for short periods.

The gures below show the operating envelopes for SM / SY compressors with refrigerants R22 and for SZ compressors with R407C, R134a, R404A and R507C.

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

cooled without need for additional fan cooling. Ambient temperature has very little eect on the compressor performance.

In case of safe tripping by the compressor overload protection the compressor must cool down to about 140°F 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’.

The operating limits serve to dene the envelope within which reliable operations of the compressor are guaranteed:

• Maximum discharge gas temperature: 275°F

• A suction superheat below 9°F (18°F for R407C) is not recommended due to the risk of liquid ood back

• Maximum superheat of 54°F

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

SM084 to 185 SY185 to 380 R22

Condensing temperature (°F)

FRCC.PC.003.A5.22

160

150

140

130

120

110

100

-10 0 1 0 20 30 40 50 60

S.H. = 9°F

S.H. = 20°F

S.H. = 54°F SUPERHEAT

Evaporating temperature (°F)

160

150

Application guidelines

Operating conditions

SZ084 to 185 R134a

SZ240 - 380 R134a

150

140

130

120

110

100

Condensing temperature (°F)

0 10 20 30 40 50 60 70

S.H. = 20°F

S.H. = 54°F SUPERHEAT

Evaporating temperature (°F)

160

150

140

130

S.H. = 20 °F

S.H. = 54°F SUPERHEAT

120

Condensing temperature (°F)

110

100

0 10 20 30 40 50 60

Evaporating temperature (°F)

SZ084 to 185 R404A / R507A

140

130

120

110

Condensing temperature (°F)

100

-10 0 10 20 30 40 50 60

S.H. = 20°F

S.H. = 54°F SUPERHEAT

Evaporating temperature (°F)

FRCC.PC.003.A5.22

Application guidelines

Operating conditions

SZ084 to 185 & SY185 R407C at DEW temperature

SZ240 to 380 & SY240-300 R407C at DEW temperature

160

150

140

130

120

110

Condensing temperature (°F)

100

-10 0 10 20 30 40 50 60 70

160

150

140

130

120

110

Condensing temperature (°F)

100

S.H. = 20°F

Dew temperature conditions

S.H. = 54 °F SUPERHEAT

Evaporating temperature (°F)

Dew temperature conditions

S.H. = 54°F SUPERHEAT

Application envelopes at mean temperatures

-10 0 10 20 30 40 50 60

Refrigerant R407C is a zeotropic mixture, which causes a temperature glide in both the evaporator and condenser. When discussing evaporating and condensing temperatures therefore, it is important to indicate whether these are DEW point values or MEAN point values. In the gure below, the dashed lines reect constant temperature and do not correspond with the constant pressure lines.

FRCC.PC.003.A5.22

Evaporating temperature (°F)

For a given cycle, the MEAN point temperatures are typically about 35.6° to 37.4°F lower than DEW point temperatures. In these Selection and Application Guidelines, Danfoss Commercial Compressors displays temperatures as DEW point values.

The performance tables for R407C are also based on DEW point values.

Condensing temperature (°F)

pressure (log)

enthalpy

Dew

Mean

Application guidelines

Dew temperature and mean temperature for R407C

Operating conditions

The following operating diagrams show the dierence between mean and dew temperature application envelopes.

Dew temperature

Example for SZ 084 to 185

Mean temperature

Example for SZ 084 to 185

160

150

140

130

120

110

Condensing temperature (°F)

100

-10 0 10 20 30 40 50 60 70

160

150

140

130

S.H. = 20°F

Dew temperature conditions

S.H. = 54 °F SUPERHEAT

Evaporating temperature (°F)

Mean temperature conditions

FRCC.PC.003.A5.22

120

110

100

-10 0 10 20 30 40 50 60

S.H. = 20 °F

S.H. = 54 °F SUPERHEAT

Evaporating temperature (°F)

160

Condensing temperature (°F)

Evaporating temperature (°F)

Application guidelines

Operating conditions

Discharge temperature protection

The discharge gas temperature must not exceed 275°F. 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 highly 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 on following page, which illustrates where DGT protection is required (ex.1) and where it is not (ex.2).

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

150

140

discharge temperature must be monitored during development test by the equipment manufacturer.

The DGT should be set to open at a discharge gas temperature of 275°F.

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.

Thermostat

Discharge line

Bracket

Example 1

Insulation

HP1

130

120

110

100

-10 0 10 20 30 40 50 60

DGT - limit

LP2LP1

Example 1 (R22, SH = 20°F) LP switch setting: LP1 = 26 psig (1.4°F) HP switch setting: HP1 = 363 psig (143.6°F) Risk of operation beyond the application envelope. DGT protection required.

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 next page. The high-pressure switch can be set to lower values depending on the application and ambient conditions. The HP switch must

Example 2

R22

Example 2 (R22, SH = 20°F) LP switch setting: LP2 = 42 psig (19.4°F) HP switch setting: HP2 = 305 psig (131°F) No risk of operation beyond the application envelope. No DGT protection required.

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.

HP2

FRCC.PC.003.A5.22

Application guidelines

Operating conditions

Internal pressure relief valve

Low pressure

The SY/SZ240 to SY/SZ380 incorporate an internal relief valve set to open between the

internal high and low pressure sides of the compressor when the pressure dierential between the discharge and suction pressures surpasses 450 to 551 psi.

This safety feature prevents the compressor from

Relief valve

developing dangerously high pressures should the high pressure cutout, for whatever reason, fail to shut down the compressor.

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 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

Working pressure range high side 158 - 401 152 - 422 97 - 292 184 - 451

Working pressure range low side 20 - 100 15 - 92 8 - 56 29 - 106

Maximum high pressure safety switch setting 406 427 297 457

Minimum low pressure safety switch setting * 7 7 7 7

Minimum low pressure pump-down switch setting ** 18 14 7 26

*LP safet y switch shall never be bypassed and shall have no time delay. ** Recommended pump-down switch settings: 1.5 bar (R22, R407C, R4 04A) or 1 bar (R134a) below nominal evaporating pressure.

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.

R22

psig

R407C

psig

R134a

psig

R4 04A/ R507A

psig

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 13 psi for R22. The compressor can be operated

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.

full time under such condition. The minimum low pressure safety switch setting may be outside the normal operating envelope and should only be reached in exceptional (emergency) situations, for example 7 psi for R22.

necessary, place an anti-short-cycle timer in the control circuit, connected as shown in the wiring diagram section "Suggested wiring diagrams logic". A three-minute (180-sec) time out is

recommended. The system must be designed in a way that guarantees a minimum compressor running time of 2 minutes so as to provide for sucient

Please contact Danfoss Technical Support for any

deviation from this guidelines. motor cooling after start-up along with proper oil return. Note that the oil return may vary since it depends upon system design.

There must be no more than 12 starts per hour (6 when a resistor soft-start accessory is

T T

introduced); a number higher than 12 reduces the service life of the motor-compressor unit. If

FRCC.PC.003.A5.22

A2 A3A1

180 s

U trap, as short as possible

3D ﬂexibility

Application guidelines

System design recommendations

General

Essential piping design considerations

Suction lines

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

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.

Piping should be designed with adequate three-dimensional exibility. It should not be in contact with the surrounding structure, unless

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

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

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").

idle, which would mislead the expansion valve's sensor (thermal bulb) at start-up.

To condenser

U-trap

0.5% slope

max. 13 ft

13 ft/s or more

U-trap, as short as possible

26 to 40 ft/s

0.5% slope

13 ft/s or more

Evaporator

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.

An evaporator with optimized 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 & tubes and air cooled coils. For all evaporator types a special care is required for superheat control leaving the evaporator and oil return.

FRCC.PC.003.A5.22

Upper loop

U Trap

Condenser

A sub-cooler circuit in the condenser that creates high sub cooling will increase eciency at high condensing pressure. 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 vapor at the expansion device inlet leading to low eciency.

Application guidelines

System design recommendations

Refrigerant charge limit Danfoss SM / SY / SZ compressors can tolerate

liquid refrigerant up to a certain extend without major problems. However, excessive liquid refrigerant in the compressor is always unfavorable 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.

BELOW charge limit ABOVE charge limit

Cooling only systems,

Packaged units

Cooling only systems

with remote condensor

and split system units

Reversible heat pump system

No test or additional safeties required



Refrigerant migration & oodback test

REC

Crankcase heater, because full system

REC

charge is not denable (risk of overcharging)

Specic tests for repetitive oodback

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

Note: for special conditions such as low ambient temperature, low refrigerant load or brazed plate heat exchangers please refer to corresponding section "Specic application recommendations".

REQREC

Use the tables below to quickly evaluate the

required compressor protection in relation with

the system charge and the application.

Compressor models

S 084-090-100 19 S 110 -120 22 S 112-124 -147 17 S 148-161 28 S 175-185 30 S 240 35 S 300-380 44

Refrigerant migration & oodback test

REQ

Sump heater

REQ

Refrigerant migration & oodback test

REQ

Sump heater

REQ

Liquid receiver (in association with LLSV & pump down)

REC

Refrigerant charge limit

(lbs)



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 SM/SZ/SY scroll compressors can tolerate occasional ooded starts as long as the total system charge does not exceed the maximum compressor refrigerant charge.

A suitable test to evaluate the risk of o-cycle

migration is the following:

• Stabilize the non running system at 41°F ambient temperature,

• Raise the ambient temperature to 68°F 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

FRCC.PC.003.A5.22

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 18°F 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). However, below 23°F ambient temperature and a wind speed of above 16 ft/sec, 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 crankcase

heater. A crankcase heater is also required on all reversible cycle applications.

The heater must be energized for a minimum of 6 hours before initial start-up (compressor service valves opened) and must remain energized whenever the compressor is o. Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg. seasonal shutdown).

Sump heater accessories are available from Danfoss (see section "Accessories").

Liquid line solenoid valve (LLSV)

Pump-down cycle

An 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.

A pump-down cycle represents one of the most eective ways to protect against the o-cycle migration of liquid refrigerant. Once the controls has been satised, a solenoid valve closes on the condenser outlet. The compressor then pumps the majority of the system 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. Recommended settings of the low-pressure pump-down switch can be found in the table section "High and low pressure protection". For suggested wiring diagrams, please see section "Suggested wiring diagram logic".

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

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

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 (ie. 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.

• 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

FRCC.PC.003.A5.22

Application guidelines

System design recommendations

Liquid ood back

may be stored in the condenser during pumpdown if all components have been properly sized.

Other application needs a liquid receiver to store the refrigerant.

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

Danfoss SM/SY/SZ scroll compressors can tolerate occasional liquid ood back. However

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

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.

system 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 54°F 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

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.

FRCC.PC.003.A5.22

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.

Application guidelines

Specic application recommendations

Low ambient application

Low ambient start-up Under cold ambient conditions (<32°F), upon

start-up the pressure in the condenser and, if present, the receiver 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 members. 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 "High and low pressure

protection" 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 SM/SY/SZ scroll compressor requires a minimum pressure dierential of 87 to 102 psi between the suction and discharge pressures 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 metal-to-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.

levels during low loading periods. A minimum of 9 °F 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.

The superheat setting of the expansion device should be sucient to ensure proper superheat

FRCC.PC.003.A5.22

For further information, please contact Danfoss.

Application guidelines

Specic application recommendations

Sump heaters

Low load operations

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 vapor 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 "O-cycle migration".

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 heat exchanger as the condensing coil, a sucient free volume for the discharge gas to accumulate is required in order to avoid excess pressure buildup. At least 1 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 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

Reversible heat pump systems

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 carryover (or oodback) 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 charge in the system, specic tests for repetitive

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

oodback are required to conrm whether or not a suction accumulator needs to be installed. A crankcase heater and discharge gas thermostat are required for reversible heat pump applications.

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.

FRCC.PC.003.A5.22

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 evaporator 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 and reversing valve, solenoid valves

The Danfoss SM/SY/SZ 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

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 275°F.

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.

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

In applications with heat recovery or condenser partialisation, servo piloted solenoid valve has 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 (SM/SY/SZ180 to

380).

Defrost and reverse cycle

The Danfoss SM/SY/SZ scroll compressor has the ability to withstand a certain amount of liquid refrigerant dynamic slug.

When compressors are installed in parallel, in order to limit liquid amount handled per compressor when beginning and ending defrost, it is recommended to avoid running part load (keep all compressors running or keep them stopped when moving 4-way valves).

FRCC.PC.003.A5.22

For further details, please refer to Parallel application guidelines FRCC.PC.005.

EXV can also be opened when compressors are stopped and before 4 way valve is moving in order to decrease pressure dierence. Opening degree and time have to be set in order to keep a minimum pressure dierence for 4 way valve moving.

Application guidelines

Specic application recommendations

Suction line accumulator

Water utilizing systems

The use of a suction line accumulator is strongly recommended in reversible cycle applications as a result 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

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

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

Sustained and repeated liquid slugging and oodback 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.

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 32°F. 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.

FRCC.PC.003.A5.22

Application guidelines

Sound and vibration management

Starting sound level

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

compressor rotation is characterized 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

Running sound level

50 Hz 60 Hz

Model

S 084 70 8 71 8 74 8 74 8 775 5011 120Z0356 S 090 70 8 72 8 75 8 77 8 7755011 120Z0356 S 100 70 8 73 8 75 8 77 8 775 5011 120Z0356 S 110 75 8 77 8 78 8 81 8 7755010 120Z0356 S 112 75 6 - - 78 6 - - 120Z0035 S 120 75 8 77 8 78 8 81 8 7755010 120Z0356 S 124 73 6 - - 77 6 - - 120Z0035 S 147  S 148  S 161  S 175 80 8 81 8 82.5 8 84 8 7755007 120Z0353 S 185 80 8 81 8 82.5 8 84 8 7755007 120Z0353 S 240 82 7 83.5 7 85 7 87 7 7755016 120Z0355 S 300 82 7 84 7 86 7 87.5 7 7755016 120Z0355 S 380 87 7 8 7.5 7 92 7 91 7 7755022 120Z0355

 For SM/SZ147-3 - 50 Hz, use acoustic hood reference 120Z135  For SM148 - 161 code 3, no acoustic hood available Sound power and attenuation are given at rated ARI conditions, measured in free space. * Bottom insulations are provided in surface sump heater accessories. Materials are UL approved and RoHS compliant. Data given for code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: ww w.danfoss.com/ODSG

Sound power

R22 R407C R22 R407C

dB(A)

74 6 77 8 78 6 81 8 120Z0035 -

79 8 79 8 83 8 83 8 7755017 120Z0356

79.5 8 79 8 84 8 83 8 7755017 120Z0356

Attenuation

dB(A)

Sound power

dB(A)

Attenuation

dB(A)

Sound power

dB(A)

Attenuation

dB(A)

Sound power

dB(A)

Attenuation

dB(A)

Acoustic

hood code

number

Bottom

insulation

code n°

Stopping sound level

Sound generation in a refrigeration or air conditioning system

SM / SY / SZ 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.

FRCC.PC.003.A5.22

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 will focus on the causes and methods of mitigation for each of the above sources.

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 SM / SY / SZ 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 lower-frequency 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

Mechanical vibrations Vibration isolation constitutes the primary

method for controlling structural vibration. Danfoss SM / SY / SZ 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. Rubber grommets are supplied with all Danfoss compressors. Once the supplied rubber grommets have been properly mounted, vibration 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

come into direct contact with any non-insulated parts on the walls of the unit.

Because of the Danfoss’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 Commercial Compressors as accessories. They have been developed to meet specic extra low noise requirement. They incorporate sound proong materials and oer excellent high and low frequency attenuation. 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.

mounted compressor be of sucient mass and 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 considerations".

Gas pulsation The Danfoss SM / SY / SZ 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

FRCC.PC.003.A5.22

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.

Application guidelines

Installation

Compressor handling and storage

Each SM / SY / SZ compressor is shipped with printed Instructions for installation. These instructions can also be downloaded from our

Each Danfoss SM / SY / SZ 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.

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

and between -31°F and 158°F 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

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

-31°F and 122°F when charged with refrigerant

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

Mounting of SM/SZ 084-090-100-110-120-148161-175-185: the required bolt size is HM8. This

bolt must be tightened to a torque of 15 ft.lbs. The bolts and washers are supplied with the assembly kit.

Mounting of SM/SZ 112-124-147: the required bolt size is HM8. This bolt must be tightened to a torque of 11 ft/lbs. The bolt and washers are supplied with the assembly kit. When a surface sump heater is used, it must be applied after grommets are mounted on compressor in order to avoid surface sump heater damage.

do not lift manually

mount the compressor in single application. These grommets attenuate to a great extent the transmission of compressor vibrations to the base frame. The grommets must be compressed until contact between the at washer and the steel-mounting sleeve is established.

HM 8 bolt

Lock washer

Flat washer

Steel mounting sle eve

Rubber grommet

Nut

HM 8 bolt

Lock washer

Flat washer

Steel mounting

sleeve

Rubber grommet

Nut

Compressor base plate

1.10 inch

0.59 inch

FRCC.PC.003.A5.22

Application guidelines

Installation

Mounting of SY/SZ 240-300-380: the required bolt size is HM10. The minimum required at washer outside diameter is 20 ft.lbs. Mounting bolts must be tightened to a torque of 30 ft.lbs. These bolts and washers are not supplied with the compressor. Note: The large at washer must be positioned in place before shipping the unit with the compressor installed.

Note: for parallel assemblies see specic recommendations in Danfoss parallel application guidelines", FRCC.PC.005.

Compressor holding charge Each compressor is shipped with a nominal dry

nitrogen holding charge between 4 and 10 psi 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

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 polyester oil in SZ compressors requires that the oil be exposed to the atmosphere just as little as possible.

Lock washer *

Large ﬂat *

1.06 inch washer

Steel mounting sleeve

Rubber grommet

* not supplied with compressor

HM 10 Bolt *

Compressor base plate

1.41 inch

Nut *

plug 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 refrigerantgrade ttings should be used and these must be

Brazing and soldering

Do not blend 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

FRCC.PC.003.A5.22

of both a design and size to allow for a minimum pressure drop through the completed assembly. Follow the brazing instructions next pages.

Never drill holes into parts of the pipe-works where llings and particles can not be removed.

failure. Recommended brazing procedures and material, are described on following page. Never drill holes into parts of the pipe-works. Where llings and particles can not be removed.

heat shield

Application guidelines

Installation

Copper to copper connections

Dissimilar metals connection

Compressor connection

When brazing copper-to-copper connections, the use of a 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 and anti-oxidant ux is necessary.

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 used for the large scroll, a double tipped torch using acetylene is recommended for the S240-300-380 brazing operation.

For rotolock version compressors, solder sleeves are available. 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 CO2 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

temperature of below 1472°F is recommended. No ux is required during brazing.

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 (SY/SZ240-300) the direction of the torch has to be as described on the picture, and maximum brazing time should be less than 2 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 d amage to the internal parts of the system and compressor.

The polyolester oil used in SY / SZ 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.

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 Commercial Compressors for further information.

FRCC.PC.003.A5.22

Application guidelines

Installation

System pressure test

Leak detection

Always use an inert gas such as nitrogen for pressure testing. Never use other gasses such as

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

oxygen, dry air or acetylene as these may form

Maximum compressor test pressure (low side) SM/SZ 084 - 185: 363 psig SZ/SY240 - 380: 290 psig

Maximum compressor test pressure (high side) 464 psig

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

Pressurize the system on HP side rst then LP side to prevent rotation of the scroll. Never let the pressure on LP side exceed the pressure on HP side with more than 72 psi. On SY/SZ240-300 models which have an

or if an external non return valve is present on the discharge line, we advise to pressurize the system not quicker than 70 psi/s to allow enough pressure equalisation between LP and HP side over the scroll elements.

348 psig

internal non return-valve in discharge tting

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

Compressor model Leak detection with refrigerant Leak detection with a mass spectrometer

SM-SY compressors Nitrogen & R22 Nitrogen & Helium

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

Vacuum evacuation and moisture removal

SZ compressors Nitrogen & R134a or R407C Nitrogen & 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.

SM / SY / SZ compressors are delivered with <100ppm moisture level. The required moisture

level in the circuit after vacuum dehydration 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’s important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after

must be < 100 ppm for systems with an SM / SY

/ SZ.

• Never use the compressor to evacuate the system.

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

• Evacuate the system to a pressure of 0.02 inHg (300 μm Hg) absolute.

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

assembly;

FRCC.PC.003.A5.22

Application guidelines

Installation

Filter driers A properly sized & 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 SM/SY/SZ 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.

Refrigerant charging

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 quantity must be suitable for both summer and winter operations.

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 & 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. Also for new installations with SM compressors with mineral oil the Danfoss DCL drier is recommended.

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.

Insulation resistance and dielectric strength

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 0.5 mA.

SM/SY/SZ 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

FRCC.PC.003.A5.22

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.

Application guidelines

Installation

Commissioning

Oil level checking and top-up

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

• Proper metering device operation and desired super heat 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 66 ft, no additional oil is required. If installation lines exceed 66 ft, 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 18°F 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.

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 oil from new cans.

Compressor series Oil

SM Mineral oil 160P

SY P.O.E. 320 SZ SZ P.O.E. 160 SZ

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».

The oil level can also be checked a few minutes

FRCC.PC.003.A5.22

Application guidelines

Ordering information & packaging

Packaging

Single pack Industrial pack

Compressor models

Length

Width

Height

SM/SZ084 18.5 14.6 23.5 148 8 44.9 37. 4 27. 8 1213 3

SM/SZ090 18 .5 14.6 23.5 152 8 44.9 37. 4 2 7. 8 1248 3

SM/SZ100 18.5 14.6 23.5 152 8 44.9 37. 4 2 7.8 1248 3

SM/SZ110-120 18 .5 14.6 23.5 172 8 44.9 37. 4 29.8 1407 3

SM112 15.0 12.6 22.8 143 8 45.3 37.4 29.3 1197 3

SM124 15.0 12.6 22.8 143 8 45.3 37.4 29.3 1197 2

SM/SZ147 15. 0 12.6 22.8 15 0 8 45.3 37.4 29.3 124 8 2

SM/SZ148-161 18.5 14.6 26.4 194 6 44.9 37. 4 31.1 1204 3

SM/SZ175-185 - SY185 18.5 15.7 2 7. 5 234 6 44.9 37. 4 34.5 1429 2

SY/ SZ240 20.1 18 .3 30.7 344 4 44.9 37. 4 35.6 14 00 2

SY/ SZ300 20.1 18 .3 30.7 355 4 44.9 37. 4 36.0 140 0 2

SY/SZ380 20.1 18 .3 31.7 362 4 44.9 37. 4 37.0 1426 2

* Nbr = number of compressors per pallet

Gross

weight

Nbr*

Length inWidth inHeight

Gross

weight

Static

stacking

pallets

Ordering information

Danfoss scroll compressors may be ordered from Danfoss Commercial Compressors in either industrial packs or in single packs as listed in

following tables For tandem assemblies, please refer to the Danfoss parallel application guideline reference FRCC.PC.005.

SM112-124-147 compressors in industrial pack

Code no.

Compressor

model

SM 112 Brazed Internal 120H0610 120H 0612 - 120H0614

SM12 4 Brazed Internal 120H0184 120H 0186 - 12 0H0188

SM147 Brazed Internal 120H0190 120 H0 311 - 12 0H0198

SZ147 Brazed Internal - 120H1097 - -

Connections

Motor

protection

3 4 7 9

200-230/3/60

460/3/60

380- 400/3/50

575/3/60

500/3/50

SM112-124-147 compressors in single pack

Compressor

model

SM 112 Brazed Internal 120H0609 120H0611 - 120H0613

SM12 4 Brazed Internal 120H0183 120 H018 5 - 120 H018 7

SM147 Brazed Internal 120H0189 120H 0191 - 120 H019 7

SZ147 Brazed Internal - 120 H109 6 - -

Connections

Motor

protection

3 4 7 9

200-230/3/60

460/3/60

380- 400/3/50

Code no.

575/3/60

500/3/50

R22

380/3/60

R22

380/3/60

FRCC.PC.003.A5.22

Application guidelines

Ordering information & packaging

SM /SY compressors in single pack R22

Code no.

Compressor

model

SM084 Brazed Internal SM084-3VI SM084-4VI SM084-7VI SM084-9VI SM090 Brazed Internal SM090-3VI SM090-4VI SM090-7VI SM090-9VI SM100 Brazed Internal SM10 0-3VI SM10 0-4VI SM100 -7VI SM100 -9VI

SM110 Brazed Internal S M110 -3VI SM110- 4VI SM110 -7VI SM110 -9VI SM120 Brazed Internal SM120-3VI SM120-4VI SM120-7VI SM120-9VI SM148 Brazed Internal SM148 -3VAI SM148- 4VAI SM148-7 VAI SM148- 9VA I

SM161 Brazed Internal SM161-3VAI SM161-4VAI SM161-7VAI SM161- 9VA I

SM175

SM185

SY185 **

SY240

SY300

SY380

** No module version available SM/SY compressors in industrial pack: use numbers from above table and replace the last digit by "M". Example: SY240A3CAM, except for voltage codes 6 and 7 available in single pack only

Connections

Brazed Thermostat SM175-3CAI SM175 -4 CAI SM175 -7CA I SM175 -9CAI

Brazed Module 24V AC S M175- 3PC I SM175-4PCI SM175 -7PCI Rotolock Thermostat S M175- 3RI SM175- 4R I SM175 -7RI SM175 -9R I Rotolock Module 24V AC SM175-3 SCI SM175 -4SC I SM175-7SC I -

Brazed Thermostat SM185-3CAI SM185-4CAI SM185-7CAI SM185-9C AI

Brazed Module 24 V AC SM185-3PCI SM185-4PCI SM185 -7PCI -

Brazed Module 230 V AC - SM185- 4XCI - SM185-9XCI Rotolock Thermostat SM185-3RI SM185-4RI SM185-7RI SM185-9RI Rotolock Module 24 V AC SM185-3SCI SM185- 4SCI SM185-7SCI Rotolock Module 230 V AC - SM185- 4YCI - SM185-9YCI

Brazed Thermostat - SY185- 4CAI - Rotolock Thermostat - SY185-4RI - -

Brazed Module 24V AC - SY240A4CAI - -

Brazed Module 115-230V AC SY240A3CBI SY240A4CBI SY240A7CBI SY240A9CBI Rotolock Module 24V AC - SY240A4PAI - Rotolock Module 115-230V AC SY240A3PBI SY240A4PBI SY240A7PBI SY240A9PBI

Brazed Module 24V AC - SY300A4CAI - -

Brazed Module 115-230V AC SY300A3CBI SY300A4CBI SY300A7CBI SY300A9CBI Rotolock Module 24V AC - SY300A4PAI - Rotolock Module 115-230V AC SY300A3PBI SY300A4PBI SY300A7PBI SY300A9PBI

Brazed Module 24V AC - SY380A4CAI - -

Brazed Module 115-230V AC - SY380A4CBI - -

Motor

protection

3 4 7 9

200-230/ 3/60

460/3/60

380-400/3/50

575/3/60 500/3/50

380/3/60

FRCC.PC.003.A5.22

Application guidelines

Ordering information & packaging

SZ compressors in single pack R407C / R134a

Code no.

Compressor

model

SZ084

SZ090

SZ100

SZ 110

SZ120

SZ14 8

SZ161

Connections

Brazed Internal SZ084-3VI SZ084-4VI SZ084-7VI SZ084-9VI

Brazed Internal SZ090 -3VI SZ090-4VI SZ090-7VI SZ090-9VI

Brazed Internal SZ10 0-3VI SZ100- 4VI SZ100-7VI SZ100- 9VI

Brazed Internal SZ110 -3 VI SZ110 -4 VI SZ110 -7VI S Z110 -9 VI

Brazed Internal SZ120-3VI SZ120-4V I S Z120 -7VI SZ120-9 VI

Brazed Internal SZ148-3VAI SZ148 -4VAI SZ14 8-7VAI SZ14 8-9VAI

Brazed Internal SZ161-3VAI SZ161-4VAI SZ161-7 VAI SZ161-9VAI

Motor

protection

Brazed Thermostat SZ175- 3CA I S Z175-4CA I SZ175 -7CA I SZ175 -9CAI

SZ175

Brazed Module 24 V AC S Z175-3PCI SZ175-4PCI S Z175-7P CI -

Rotolock Thermostat S Z175-3RI SZ175 -4RI SZ175-7R I S Z175-9 RI

Rotolock Module 24 V AC S Z175-3SCI SZ175- 4SCI S Z175-7S CI -

Brazed Thermostat SZ185-3CAI SZ185-4 CAI SZ185-7CA I SZ185-9CAI

Brazed Module 24 V AC SZ185-3P CI SZ185-4PCI SZ185-7PCI -

SZ185

Brazed Module 230 V - SZ185- 4XCI - SZ185-9XCI

Rotolock Thermostat SZ185-3RI SZ185-4RI SZ185-7RI SZ185 -9RI

Rotolock Module 24 V AC SZ185-3SCI SZ185 -4SCI SZ185 -7SCI -

Rotolock Module 230 V - SZ185-4YCI - SZ185-9YCI

Brazed Module 24 V AC - SZ240A4CAI - -

SZ240

Brazed Module 115/230 V SZ240A3CBI SZ240A4CBI SZ240A7CBI SZ240A9CBI

Rotolock Module 24 V AC - SZ 240A4PAI - -

Rotolock Module 115/230 V SZ240A3PBI SZ240A4PBI SZ240A7PBI SZ240A9PBI

Brazed Module 24 V AC - SZ300A4CAI - -

SZ300

Brazed Module 115/230 V SZ300A3CBI SZ300A4CBI SZ300A7CBI SZ300A9CBI

Rotolock Module 24 V AC - SZ 30 0A4PA I - -

Rotolock Module 115/230 V SZ300A3PBI SZ300A4PBI SZ300A7PBI SZ300A9PBI

SZ 380

Brazed Module 24 V AC - SZ380A4CAI - -

Brazed Module 115/230 V - SZ380A4CBI - -

SZ compressors in industrial pack: use numbers from above table and replace the last digit by "M". Example: SZ240A4CAM, except for voltage codes 6 and 7 available in single pack only

3 4 7 9

200-230/3/60

460/3/60

380-400/3/50

575/3/60 500/3/50

380/3/60

FRCC.PC.003.A5.22

Application guidelines

Solder sleeve adaptator set

Accessories

Typ e Code n° Description Application Packaging

7765005 Solder sleeve adapter set (1"3/4~1"1/8), (1"1/4~3/4") SM/SZ084-090-100 Multipack 6

120Z0 405 Solder sleeve adapter set (1"3/4~1"3/8), (1"1/4~7/8")

7765006* Solder sleeve adapter set (1"3/4~1"3/8), (1"1/4~7/8")

7765028 Solder sleeve adapter set (2"1/4~1"5/8), (1"3/4~1"1/8) SM/SZ160-175-185, SY/SZ 240-300 Multipack 6

120Z0317

* Diameter restrictor

Rotolock adaptor

Typ e Co de n° Description Application Packaging

120Z0366 Adaptor (1"1/4 Rotolock -3/4" ODS) Models with 3/4" ODF Multipack 10

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

120Z0 432 Adaptor (2"1/4 Rotolock -1"5/8 ODS) Models with1"5/8 ODF Multipack 10

Gaskets

Typ e Code n° Description Application Packaging

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

G08 815 6133 Gasket, 2"1/4 Models with 2"1/4 rotolock connection Multipack 10

G08 7956004 Gasket, 2"1/4 Models with 2"1/4 rotolock connection Industry pack 50

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

Solder sleeve adapter set (ange, 2»1/8 ODF), (1»3/4 rotolock, 1»3/8 ODF)

SM110-112-120 -124-147-14 8-161&

SZ110 -115-120 -125-147-148-161

SM110-112-120 -124-147-14 8-161&

SZ110 -115-120 -125-147-148-161

SY/Z380 Single 1

Multipack 8

Multipack 6

Pack

size

Pack

size

Pack

size

Solder sleeves

Typ e Code n° Description Application Packaging

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

P02 79530 05 Solder sleeve P02 (1"3/4 Rotolock - 1"1/8 ODF) Models with 1"3/4 rotolock connection Industry pack 50

P03 81530 06 Solder sleeve P03 (2"1/4 Rotolock - 1"5/8 ODF) Models with 2"1/4 rotolock connection Multipack 10

P03 7953006 Solder sleeve P03 (2"1/4 Rotolock - 1"5/8 ODF) Models with 2"1/4 rotolock connection Industry pack 50

P04 8153 008 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

P08 8153 005 Solder sleeve P08 (2"1/4 Rotolock - 1"3/8 ODF) Models with 2"1/4 rotolock connection Multipack 10

P10 8153003 Solder sleeve P10 (1"3/4 Rotolock - 1"3/8 ODF) Models with 1"3/4 rotolock connection Multipack 10

FRCC.PC.003.A5.22

Pack

size

Application guidelines

Accessories

Rotolock nuts

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

8153126 Rotolock nut,2"1/4 Models with 2"1/4 rotolock connection Multipack 10

120Z0 047 Rotolock nut,2"1/4 Models with 2"1/4 rotolock connection

Industry pack

Rotolock service valve

Typ e Code n° Description Application Packaging

7703009 Valve set, V02 (1"3/4 ~ 1"1/8), V04(1"1/4 ~ 3/4") SM / SZ 084 to 100 - 110* to 161* Multipack 6

7703392 Valve set, V10 (1"3/4 ~ 1"3/8), V05(1"1/4 ~ 7/8") SM / SZ 110 to 161 Multipack 6

7703010* Valve set, V08 (2"1/4 ~ 1"3/8), V07 (1"3/4 ~ 7/8") SY / SM / SZ 175/185*

7703383 Valve set, V03 ( 2"1/4 ~ 1"5/8), V02 (1"3/4 ~ 1"1/8) SY / SZ 175 to 300 Multipack 4

120Z0316 Valve set, V12 (ange 2"1/8), V10(1"3/4 ~ 1"3/8) SY / SZ 380 Single pack 1

* diameter restriction

3-phase soft start equipment

Pack

size

Pack

size

Typ e Code n° Description Application Packaging

MCI15C 7705006 Electronic soft start kit, MCI 15 C SM/S Z0 84 -110 Single pack 1 MCI25C 7705007 Electronic soft start kit, MCI 25 C SM/SZ120-185 Single pack 1

MCI50CM 7705009 Electronic soft start kit, MCI 50 CM SY/ SZ240 -38 0 Single pack 1

Surface sump heaters

Code n° Accessory description Application Packaging

120Z0388 80W 24V surface sump heater CE & UL 120Z0389 80W 230V surface sump heater CE & UL Multipack 8 120Z0390 80W 400V surface sump heater CE & UL Multipack 8 120Z0391 80W 460V surface sump heater CE * Multipack 8 120Z0 402 80W 575V surface sump heater CE * Multipack 8 120Z0361 48W 24V sur face sump heater + bottom insulation, CE & UL 120Z0380 48W 230V surface sump heater + bottom insulation, CE & UL Multipack 6 120Z0381 48W 400V surface sump heater + bottom insulation, CE & UL Multipack 6 120Z0382 48W 4 60V surface sump heater + bottom insulation, CE * Multipack 6 120Z0383 48W 575V surface sump heater + bottom insulation, CE * Multipack 6 120Z0360 56W 24V surface sump heater + bottom insulation, CE & UL 120Z0376 56W 230V sur face sump heater + bottom insulation, CE & UL Multipack 6 120Z0377 56W 40 0V surface sump heater + bottom insulation, CE & UL Multipack 6 120Z0378 56W 4 60V surface sump heater + bottom insulation, CE * Multipack 6 120Z0379 56W 575V sur face sump heater + bottom insulation, CE * Multipack 6 120Z0359 80W 24V sur face sump heater + bottom insulation, CE & UL 120Z0372 80W 230V surface sump heater + bottom insulation, CE & UL Multipack 4 120Z0373 80W 400V surface sump heater + bottom insulation, CE & UL Multipack 4

120Z0374 80W 460V surface sump heater + bot tom insulation, CE * Multipack 4

120Z0375 80W 575V sur face sump heater + bottom insulation, CE * Multipack 4

SM 112 - 124 - 147 - SZ147

SM / SZ 084 - 090 -100 - 110 - 120 - 148 - 161

SM / SZ 175 & SM / SY / SZ 185

SM / SZ 240 to SY / SZ 380

Multipack 8

Multipack 6

Multipack 4

Pack

size

Pack

size

FRCC.PC.003.A5.22

Application guidelines

Discharge temperature protection

Accessories

Typ e Code No Description Application Packaging

7750009 Discharge thermostat kit All models Multipack 10

7973008 Discharge thermostat kit All models Industry pack 50

Mounting hardware

Typ e Code No Description Application Packaging

8156138

8156147

8156144 Mounting kit for scroll compressors. Grommets, sleeves SY/SZ240-300 Single pack 1

8156148

120Z0 066

Acoustic hoods

Typ e Code No Description Application Packaging

7755011 Acoustic hood for scroll compressor S084-S090-S100 SM/SZ084-090-100 Single pack 1

7755010 Acoustic hood for scroll compressor S110-S120 SM/SZ110 & SM/SZ120 Single pack 1

7755009 Acoustic hood for scroll compressor S115-S125 SM /SZ125 Single pack 1

7755017

7755008 Acoustic hood for scroll compressor S160 SM/SZ160 Single pack 1

7755007 Acoustic hood for scroll compressor S175-S185 SM/SZ175-185 Single pack 1

7755016 Acoustic hood for scroll compressor S240-S300 SY/ SZ240 -30 0 Single pack 1

7755022 Acoustic hood for scroll compressor S380 SY/SZ380 Single pack 1

120Z0035 Acoustic hood for scroll compressor, SM112-124-147

120Z0135 Acoustic hood for scroll compressor, SM147-3 SM/SZ147 code 3 Single pack 1

120Z0356 Bottom insulation SM/SZ08 4-090-100-110-120 -148-161 Single pack 1

120Z0353 Bottom insulation SM/SZ175&SM/SY/SZ185 Single pack 1

120Z0355 Bottom insulation SY/SZ240 to SY/SZ380 Single pack 1

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

Mounting kit for scroll compressors. Grommets, sleeves, bolts, washers, rotolock nuts, solder sleeves, gaskets

Mounting kit for scroll compressors. Grommets, sleeves, rotolock nuts, solder sleeves, gaskets

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

Acoustic hood for scroll compressor S148-S161 (except code 3)

SM/SZ084- 090 -100 -110-120-148 -161-175-

185

SM/SZ148-161-175-185 Single pack 1

SY/ SZ240 -30 0 Single pack 1

SM112-124 -147 - SZ147 Single pack 1

SM/SZ148.161 except code 3 Single pack 1

SM112-124-147 (except SM147 code 3)

SZ147

Single pack 1

Motor protection modules

Pack

Size

Pack

Size

Pack

Size

Typ e Code n° Description Application Packaging

8169015 Electronic motor protection module, 24 V AC

8169016 Electronic motor protection module, 115/230 V Single pack 1

FRCC.PC.003.A5.22

SY/SZ240-295-380-485

Single pack 1

Pack

size

Application guidelines

Terminal boxes, covers & T-block connectors

Accessories

Typ e Code No Description Application Packaging

8156139 Terminal box 7.3 x 7.8 inch, incl cover SM/SZ148 -3.161-3.175.185 Single pack 1

120Z0 413 Terminal box cover SM/SZ147-3 Single pack 1

SM08 4.0 90.10 0.110.112.120.124.147

.148.161 (except SM148-3.161-3) &

SZ08 4.090 .100.110.120.148 .161 (excep t

SZ148-3. 161-3)

SM/SZ084-110.120.148 (except -3). 161

(except -3). & SM112-124-147 (except-3)-

SZ147

SM/SZ147-3.148 -3.161- 3.175.185 &

SY240.300.380 (except SY240-3.300-3) &

SZ175.185.240. 300.380 (except SZ240-

3.300-3.)

SY/SZ240.300.380 Single pack 1

Multipack 10

Lubricant

8156135

8173230 T block connector 2 x 2.2 inch

8173021 T block connector 2.4 x 3 inch

8173331 T block connector 3.1 x 3.1 inch SY/ SZ 240 .30 0-3 Multipack 10

120Z0 458 Terminal box 8.27 x 7.48 inch, incl cover SY/SZ240.300.380 Single pack 1

120Z0462

Service kit for terminal box 3.8 x 4.5 inch, including 1 cover, 1 clamp, 1 T block connector 2 x 2.2 inch

Terminal box 8.27 x 7.48 inch, incl cover and module wiring for 10.16 x 8.19 inch terminal box replacement

Pack

Size

Typ e Code No Description Application Packaging

160SZ 7754023 POE lubricant, 160SZ, 1.05 quart can SZ with R407C, R134a, R404A Multipack 12

160SZ 120Z0571 POE lubricant, 160SZ, 2.64 quart can SZ with R407C, R134a, R404A Multipack 4

320SZ 775 4121 POE lubricant, 320SZ, 1.05 quart can SY with R22 Multipack 12

320SZ 120Z0572 POE lubricant, 320SZ, 2.64 quart can SY with R22 Multipack 4

160P 7754001 Mineral oil, 160P, 2.64 quart can SM with R22 Multipack 8

160P 7754002 Mineral oil, 160P, 5.28 quart can SM with R22 Multipack 4

Miscellaneous

Typ e Code No Description Application Packaging

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

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

7956005 Gasket for 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

FRCC.PC.003.A5.22

Danfoss Commercial Compressors 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 nd the best possible energy ecient 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 spread across three continents.

Danfoss Variable Speed scroll compressors

Maneurop® Variable Speed reciprocating compressors

Maneurop® Reciprocating Compressors

Danfoss Air Conditioning scroll compressors

Optyma

& Optyma PlusTM

Condensing Units

Danfoss Heat Pump scroll compressors

Danfoss Refrigeration scroll compressors

Light commercial reciprocating compressors

(manufactured by Secop)

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.

member of:

www.asercom.org

http://danfoss.us.com

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed. All trademarks in this material are property of the respec tive companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

FRCC.PC.003.A5.22 - April 2014 - Replace FRCC.PC.003.A4.22 - February 2013 Copyright Danfoss Commercial Compressors - 04/2014

Danfoss R22, R407C, R137a, R404A, R507A Application Manualline

Specifications and Main Features

Frequently Asked Questions

User Manual