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

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

3

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

4

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

5

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

-

A

Motor protection type

Internal overload protector

Internal thermostat

Electronic protection

4
7

module

R

CA

V : brazed

A

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

C

A

Module voltageConnection

: brazed

: 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

B: 115/230V

Single compressors

Single compressors

Applies to

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

S 112-124-147

S 175-185

S 240 - 300

S 380

6

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

7

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

8

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

9

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

10

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

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

11

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

11

7.36

4 holes
Ø 0.76

12

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

12

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

12

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

12

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 *

13

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).

1

1

2

2

Oil drain connection

Schrader

14

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

15

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

L1

Terminal box

Motor Protection

N

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

16

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

17