Danfoss R134a Instruction Manual

Danfoss scroll compressors
SM SY SZ
R22 - R407C - R134a - R404A - R507A - R513A - 50 - 60 Hz
Application guidelines
http://cc.danfoss.com

Content
Compressor model designation .............4
Nomenclature ........................................................... 4
Danfoss scroll compression principle ....5
Features.....................................................6
Technical specications...........................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/SZ 147 code 3...................................................10
SM/SZ 148-161 ......................................................... 11
SM/SZ 175-185 & SY185
R and C version .......................................................12
SM/SZ 185 P, X, Y version..................................... 13
SY 240-300-380....................................................... 14
Connection details ................................................ 15
Electrical data, connections and wiring16
Motor voltage..........................................................16
Wiring connections...............................................16
IP rating...................................................................... 17
Terminal box temperature.................................. 17
Three phase electrical characteristics............18
Danfoss MCI soft-start controller .....................19
General wiring information................................20
Motor protection....................................................22
Voltage unbalance.................................................23
Approval and certications...................24
Approvals and certicates..................................24
Pressure equipment directive 2014/68/EU...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 temperatures26
Application envelopes at mean
temperatures...........................................................29
Discharge temperature protection ................31
Maximum Operating Pressure (MOP)
protection.................................................................31
High and low pressure protection...................31
Cycle rate limit.........................................................32
System design recommendations ........33
General.......................................................................33
Essential piping design considerations.........33
Refrigerant charge limit.......................................34
O-cycle migration ...............................................34
Liquid ood back ...................................................36
Specic application recommendations37
Low ambient application ....................................37
Low load operations.............................................38
Brazed plate heat exchangers...........................38
Electronic expansion valve.................................38
Reversible heat pump systems.........................38
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.............................................44
Leak detection ........................................................45
Vacuum evacuation and moisture removal.45
Filter driers................................................................45
Refrigerant charging.............................................45
Insulation resistance and dielectric strength46
Commissioning.......................................................46
Oil level checking and top-up...........................46
Ordering information & packaging......47
Packaging .................................................................47
Ordering information ...........................................47
Accessories..............................................52
3AB237986441643en-010801
Application Guidelines

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.
Code numbers for ordering list are in section
“Ordering information & packaging”.
For tandem and trio assemblies, please refer
to the Danfoss Parallel Application Guidelines
documentation FRCC.PC.005.
Nomenclature
Compressor model designation
Family, lubricant
& refrigerant
Nominal capacity
in thousand Btu/h at 60 Hz, R22,
ARI conditions
Nominal capacity
Family, lubricant
& refrigerant
SM: Scroll, Mineral oil, R22/R417A*
SY: Scroll, POE lubricant, R22/R417A/
R407C/R134a/R513A**
SZ: Scroll, POE lubricant, R407C - R134a
(R404A, R507A for SZ084 to SZ185, R513A
for SZ148 to SZ185 **)
Voltage Version Evolution
index
C
A
4
7
SZ
SY
-
A
R
CA
185
300
Single compressors
Single compressors
: brazed
Internal overload protector
AS 112-124-147
S175-185
110-240V
24V AC
110-240V
C: brazed
Motor protection type
V: brazed S 084-090-100-110-120-148-161
Applies to
R: rotolock
X
P: brazed
: brazed
CB
CA
Y: rotolock
C: brazed
PA
B: 110-240V
A: 24V AC
PB
P: rotolock A: 24V AC
CB
B: 110-240V
CA C: brazed A: 24V AC
B: 110-240V
Module voltageConnection
Internal thermostat
S 240 - 300
S 380
Electronic protection
module
S 185
Motor voltage code
3: 200-230V/3~/60 Hz
4: 380-400V/3~/50 Hz - 460V/3~/60 Hz
SY380: 380-415V/3~/50 Hz - 460V/3~/60 Hz
6: 230V/3~/50 Hz
7: 500V/3~/50 Hz - 575V/3~/60 Hz
9: 380V/3~/60 Hz
SY380: 380-400V/3~/60 Hz
* When SM compressors are used with R417A, the factory charged mineral oil 160P must be replaced by polyolester oil 160SZ
** Only motor voltage 4 are qualified with R513A
4AB237986441643en-010801
Application Guidelines

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.
Danfoss scroll compression principle
SM / SY / SZ 084-090-100-110-120-148-161-175-185-240-300-380
First orbit:
SUCTION
Second orbit:
COMPRESSION
Third orbit:
DISCHARGE
5AB237986441643en-010801
Application Guidelines

In addition to the existing SM range compressors
previously available, Danfoss is completing its
range with 3 compressors.
The new SM112-124 and SM/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.
• 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.
Features
SM 112-124 - SM/SZ147
Heat shield that lowers the heat transfer between
discharge and suction gas and the acoustic level
R22 optimized scroll prole
Improved lower bearing centring
Patented motor centring spacer
Patented motor cap
New PTFE spring seal for even lower leaks
For regular updates and detailed capacities, please refer to Coolselector®2 software
6AB237986441643en-010801
Application Guidelines

Technical specications
Model
Nominal
Cap. 60 Hz Nominal cooling capacity Power input COP E.E.R. Swept volume Displacement Oil charge Net weight 
TR WBtu/h kW W/W Btu/h /W cm3/rev m3/h dm3kg
R22 SINGLE
SM084 720 400 69 600 6.12 3.33 11.4 114. 5 19.9 3.25 64
SM090 7.5 21 800 74 400 6.54 3.33 11. 4 120.5 21.0 3.25 65
SM100 823 100 78 800 6.96 3.33 11.4 127.2 22.1 3.25 65
SM110 9 25 900 88 400 7.82 3.32 11.3 144.2 25.1 3.25 73
SM112 9.5 27 600 94 200 7.92 3.49 11.9 151.5 26.4 3.30 64
SM120 10 30 100 102 700 8.96 3.36 11. 5 166.6 29.0 3.25 73
SM124 10 31 200 106 500 8.75 3.56 12.2 169.5 29.5 3.30 64
SM147 12 36 000 122 900 10.08 3.57 12.2 193.5 33.7 3.30 67
SM148 12 36 100 123 200 10.8 3.34 11.4 199.0 34.6 3.60 88
SM161 13 39 000 133 100 11. 59 3.37 11. 5 216.6 37.7 3.60 88
SM175 14 42 000 143 300 12.47 3.37 11.5 233.0 40.5 6.20 100
SM/SY185 15 45 500 155 300 13.62 3.34 11.4 249.9 43.5 6.20 100
SY240 20 61 200 208 900 18.2 3.36 11.5 347. 8 60.5 8.00 150
SY300 25 78 200 266 900 22.83 3.43 11.7 437.5 76.1 8.00 157
SY380 30 94 500 322 500 27. 33 3.46 11.8 531.2 92.4 8.40 158
R407C SINGLE
SZ084 719 300 65 900 6.13 3.15 10.8 114.5 19.9 3.25 64
SZ090 7. 5 20 400 69 600 6.45 3.16 10.8 120.5 21.0 3.25 65
SZ100 821 600 73 700 6.84 3.15 10.8 127. 2 22.1 3.25 65
SZ110 924 600 84 000 7.76 3.17 10.8 144.2 25.1 3.25 73
SZ120 10 28 600 97 600 8.99 3.17 10.8 166.6 29.0 3.25 73
SZ147 12 34 900 119 079 9.92 3.52 12.0 193.5 33.7 3.30 67
SZ148 12 35 100 119 800 10.99 3.19 10.9 199.0 34.6 3.60 88
SZ161 13 38 000 129 700 11.8 4 3.21 11.0 216.6 37.7 3.60 88
SZ175 14 40 100 136 900 12.67 3.17 10.8 233.0 40.5 6.20 100
SZ185 15 43 100 147 100 13.62 3.16 10.8 249.9 43.5 6.20 100
SY240 20 59 100 201 700 18.55 3.19 10.9 347. 8 60.5 8.00 150
SY300 25 72 700 248 100 22.73 3.20 10.9 437. 5 76.1 8.00 157
SY380 30 89 600 305 800 27. 59 3.25 11.1 531.2 92.4 8.40 158
R134a SINGLE
SZ084 712100 4110 0 3.83 3.15 10.75 114. 5 19.9 3.25 64
SZ090 7.5 12900 43900 4.08 3.15 10.77 120.5 21.0 3.25 65
SZ100 813800 47000 4.36 3.16 10.78 127. 2 22.1 3.25 65
SZ110 915600 53100 4.90 3.17 10.83 144.2 25.1 3.25 73
SZ120 10 17900 61200 5.62 3.19 10.89 166.6 29.0 3.25 73
SZ147 12 20800 71000 6.13 3.40 11. 59 193.5 33.7 3.25 67
SZ148 12 21500 73400 6.96 3.09 10.55 199.0 34.6 3.60 88
SZ161 13 23000 78400 7. 30 3.15 10.74 216.6 37.7 3.60 88
SZ175 14 25300 86200 7.90 3.20 10.91 233.0 40.5 6.20 100
SZ185 15 26900 91700 8.41 3.20 10.91 249.9 43.5 6.20 100
SY240 20 35600 121600 11.6 0 3.07 10.48 347.8 60.5 8.00 150
SY300 25 44400 151700 14.43 3.08 10.51 437.5 76.1 8.00 157
SY380 30 55800 190500 17. 26 3.23 11.0 4 531.2 92.4 8.40 158
R513A SINGLE
SZ148 12 20665 70512 6.96 2.97 10.13 199.0 34.6 3.60 88
SZ161 13 23634 80642 7. 54 3.14 10.70 216.6 37.7 3.60 88
SZ175 14 24413 83299 8.07 3.03 10.32 233.0 40.5 6.20 100
SZ185 15 27438 93621 8.64 3.18 10.84 249.9 43.5 6.20 100
SY240 20 37450 127783 12.1 3.10 10.59 347. 8 60.5 8.00 150
SY300 25 47497 162065 14.7 3.22 10.99 437. 5 76.1 8.00 157
SY380 30 58537 199734 18.1 3.23 11.03 531.2 92.4 8.40 158
TR = Ton of Refrigeration Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60Hz
COP = Coecient Of Performance Net weight with oil charge
EER = Energy Eciency Ratio
50 Hz data
Subject to modication without prior notication
Rating conditions
Refrigerant R22 R134a/R513A R407C
Frequency 50 Hz 50 Hz 50 Hz
Standard rating conditions ARI EN12900 -
Evaporating temperature 7.2 °C 5 °C 7.2 °C (dew point)
Condensing temperature 54.4 °C 50 °C 54.4 °C (dew point)
Sub-cooling 8.3 K 10 K 8.3 K
Superheat 11.1 K 0 K 11.1 K
For regular updates and detailed capacities, please refer to Coolselector®2 www.coolselector.danfoss.com
7AB237986441643en-010801
Application Guidelines

Technical specications
Model
Nominal
Cap. 60 Hz Nominal cooling capacity Power input COP E.E.R. Swept volume Displace- ment Oil charge Net weight 
TR WBtu/h kW W/W Btu/h /W cm3/rev m3/h dm3kg
R22 SINGLE
SM084 724600 84000 7.4 0 3.34 11.4 114. 5 24.1 3.25 64
SM090 7.5 26400 90100 7.80 3.37 11. 5 120.5 25.3 3.25 65
SM100 827500 93900 8.10 3.38 11. 5 127. 2 26.7 3.25 65
SM110 931600 107800 9.30 3.38 11. 5 144.2 30.3 3.25 73
SM112 9.5 34000 116000 9.60 3.53 12.1 151.5 31.8 3.30 64
SM120 10 36700 125300 10.80 3.40 11.6 166.6 35.0 3.25 73
SM124 10.5 37700 128700 10.60 3.56 12.2 169.5 35.6 3.30 64
SM147 12 43600 148800 12.20 3.58 12.2 193.5 40.6 3.30 67
SM148 12 43800 149500 13.00 3.37 11. 5 199.0 41.8 3.60 88
SM161 13 47600 162500 14.10 3.39 11.6 216.6 45.5 3.60 88
SM175 14 51100 174 400 15.30 3.34 11.4 233.0 48.9 6.20 100
SM/SY185 15 55300 188700 16.30 3.39 11.6 249.9 52.5 6.20 100
SY240 20 74100 252900 22.10 3.35 11.4 347.8 73.0 8.00 150
SY300 25 94500 322500 27. 50 3.43 11.7 437. 5 91.9 8.00 157
SY380 30 115300 393500 33.40 3.46 11.8 531.2 111. 6 8.40 158
R407C SINGLE
SZ084 722500 76800 7.10 3.19 10.9 114. 5 24.1 3.25 64
SZ090 7.5 24400 83300 7.6 0 3.20 10.9 120.5 25.3 3.25 65
SZ100 826500 90400 8.20 3.24 11.1 127.2 26.7 3.25 65
SZ110 930100 102700 9.30 3.24 11.1 144.2 30.3 3.25 73
SZ120 10 34800 118800 10.70 3.24 11.1 166.6 35.0 3.25 73
SZ147 12 42300 144328 12.03 3.52 12.0 193.5 40.6 3.30 67
SZ148 12 42600 145400 13.30 3.19 10.9 199.0 41.8 3.60 88
SZ161 13 46000 157000 14.30 3.21 11.0 216.6 45.5 3.60 88
SZ175 14 48700 166200 15.30 3.19 10.9 233.0 48.9 6.20 100
SZ185 15 51800 176800 16.40 3.15 10.8 249.9 52.5 6.20 100
SY240 20 7110 0 242700 22.70 3.14 10.7 347.8 73.0 8.00 150
SY300 25 87900 300000 27. 50 3.20 10.9 437. 5 91.9 8.00 157
SY380 30 107300 366200 33.50 3.20 10.9 531.2 111.6 8.40 158
R134a SINGLE
SZ084 716700 57100 5.06 3.31 11. 29 114. 5 24.1 3.25 64
SZ090 7.5 17700 60300 5.33 3.31 11. 31 120.5 25.3 3.25 65
SZ100 818700 63800 5.64 3.32 11.32 127. 2 26.7 3.25 65
SZ110 921300 72800 6.41 3.33 11. 36 144.2 30.3 3.25 73
SZ120 10 24800 84700 7.43 3.34 11.40 166.6 35.0 3.25 73
SZ147 12 28300 96600 8.04 3.52 12.02 193.5 40.6 3.25 67
SZ148 12 29000 99100 9.37 3.10 10.57 199.0 41.8 3.60 88
SZ161 13 31500 107500 9.68 3.25 11.10 216.6 45.5 3.60 88
SZ175 14 34400 11730 0 10.39 3.31 11. 29 233 48.9 6.20 100
SZ185 15 36600 124800 11.10 3.30 11. 25 249.9 52.5 6.20 100
SY240 20 49400 168600 15.37 3.21 10.97 347.8 73.0 8.00 150
SY300 25 60600 206900 19.61 3.09 10.55 437. 5 91.9 8.00 157
SY380 30 75800 258600 23.22 3.26 11.14 531.2 111.6 8.40 158
R513A SINGLE
SZ148 12 28861 98477 9.32 3.10 10.57 199.0 41.8 3.60 88
SZ161 13 32617 111292 10.01 3.26 11.12 216.6 45.5 3.60 88
SZ175 14 33952 115847 10.58 3.21 10.94 233.0 48.9 6.20 100
SZ185 15 38009 129690 11. 33 3.35 11.45 249.9 52.5 6.20 100
SY240 20 51208 174727 15.9 3.22 10.99 347.8 73.0 8.00 150
SY300 25 64441 219879 19.5 3.30 11. 25 437.5 91.9 8.00 157
SY380 30 69586 79439 24.7 3.22 10.99 531.2 111.6 8.40 158
TR = Ton of Refrigeration Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60Hz
COP = Coecient Of Performance Net weight with oil charge
EER = Energy Eciency Ratio
60 Hz data
Subject to modication without prior notication
Refrigerant R22/R134a/R513A R407C
Frequency 60 Hz 60 Hz
Standard rating conditions ARI standard conditions -
Evaporating temperature 7.2 °C 7.2 °C (dew point)
Condensing temperature 54.4 °C 54.4 °C (dew point)
Sub-cooling 8.3 K 8.3 K
Superheat 11.1 K 11.1 K
Rating conditions
For regular updates and detailed capacities, please refer to Coolselector®2 www.coolselector.danfoss.com
8AB237986441643en-010801
Application Guidelines

Dimensions
SM/SZ 084-090-100-110-120
Ø 240
Ø 230
Ø 254
A: 464.5
B: 514.5
A: 381.6
B: 431.6
115.3
A: 294.5
B: 330.8
100.4
A: 508
B: 558
A: 251.9
B: 288.4
A: 141.9
B: 178.4
99.4
284
284
220
220
A: 163
B: 179
185
A: 156.7
B: 162
A: SM/SZ 084-090-100
B: SM/SZ 110-120
45°
30°
162.8 99
4 holes Ø 19.4
All dimensions in mm
Grommet
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
15.25 mm
Compressor
base plate
9AB237986441643en-010801
Application Guidelines

Dimensions
SM 112-124-SM/SZ147*
* except code 3
SM/SZ 147 code 3
30 °
190.5
Ø 220.8
A: 535
B: 540
C: 542
117
189
Ø 223.6
A: 504
B: 509
C: 511
A: SM112
B: SM124
C: SM/SZ147
101
Ø 243
278
4 holes
Ø 19.05
60 °
180
154
230 190.5
173
30 °
230
Ø 224
Ø 243
4 holes
Ø 19
157
154
230
190.5
200
154
173
230 190.5
30°
30°
60°
101
509
540
278
All dimensions in mm
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
15.25 mm
Compressor
base plate
Grommet
10 AB237986441643en-010801
Application Guidelines

Dimensions
SM/SZ 148-161
Ø 266
186
198
440
200
99.5
158.6 4 holes
Ø 19.4
173
220
220
284
358
209
284
SM 148-161 code 3 SM 148-161 code 4
30°
591
180
376
115.3
270.4
Ø266
99.5
440
187
331
99
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
28 mm
Compressor
base plate
Grommet
All dimensions in mm
11AB237986441643en-010801
Application Guidelines

Dimensions
SM/SZ 175-185 & SY185
R and C version
202
167
678
641.3
198
528.5
237
180
110.1
Ø 256
Ø 266
Brazed version Rotolock version
Ø 316.3
195
171
345.4
4 holes
Ø 19.43
279.4
370.8
304.8
197 180
430
238.5
187
186
30°
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
28 mm
Compressor
base plate
Grommet
All dimensions in mm
12 AB237986441643en-010801
Application Guidelines

Dimensions
SM/SZ 185 P, X, Y version
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
28 mm
Compressor
base plate
Grommet
All dimensions in mm
Brazed version Rotolock version
Ø 256
Ø 266
615
153
SANS COMPRESSION: 29.5
/ Without compression
AVEC COMPRESSION: 28.0
/ With compression
78
650
Ø 317 81
345.4
184
428
178
192
304.8
371
156 279.4
187
83
215
187
528.5±1.2
90°
35°
30°
90°
4 holes
Ø 19.43
Ø 266
Ø 256
649 614 187
215
153
77 Ø 317
345.4
195
428
171
279.4
185
192
304.8
371
178
81 83
153
528.5±1.2
SANS COMPRESSION: 29.5
/ Without compression
AVEC COMPRESSION: 28.0
/ With compression
4 holes
Ø 19.43
90°
35°
30°
90°
13AB237986441643en-010801
Application Guidelines

Dimensions
SY 240-300-380
Lock washer * HM 10 Bolt *
Large at *
27 mm washer
Steel mounting sleeve
Rubber grommet
Nut *
36 mm
Compressor base plate
* not supplied with compressor
All dimensions in mm
Grommet
Ø344
Discharge
A&B: 1”1/8
C: 1”3/8
Ø333
4 holes Ø25
A: 690.9±2
B: 701.9±2
C: 726
A: 618
B: 629
C: 653 187
A: 479.5±1.2
B: 490.5±1.2
C: 514.7±1.2
Suction
A&B: 1”5/8
C: 2”1/8
216
159.7
87.1 98
159.7
392
392
304.8
202
206
209
A&B: 402 - C: 420
185.9
454
294
193.5
141
30°
35°
90° A: SY/SZ240
B: SY/SZ300
C: SY/SZ380
Brazed version Rotolock version
A: 690.9
B: 701.9
A: 479.5 ±1.2
B: 490.5 ±1.2
A: 618
B: 629
187
Discharge 1”1/8
Suction
A: 1”1/2
B: 1”5/8
404
216
392
A: SY/SZ240
B: SY/SZ300
392
454
202
141
209
404
208
90°
30°
35°
193.5
185.9
294
304.8
87.1 98
159.7
159.7
Ø344
Ø333
4 holes Ø25
14 AB237986441643en-010801
Application Guidelines

Dimensions
Model SM/SZ084-090-100-110-
120-148-161 SM/SZ175 - SM/SZ/SY185 SM112-124- SM/SZ147 SY240-300 SY380
Version VR-Y C-P-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
Connection details
Suction and discharge
connections
Oil drain connection
Oil equalisation connection
Oil sight glass
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 240 to 380, it is not possible to drain
oil from the suction connection.
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
SY240-300-380: 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 Guidelines reference FRCC.
PC.005 for details).
The oil ll connection and gauge port is a 1/4"
male are connector incorporating a schrader
valve.
All Danfoss SM / SY / SZ scroll compressors come
equipped with a sight glass (1"1/8-18 UNEF)
which may be used to determine the amount and
condition of the oil contained within the sump.
Brazed version Rotolock version

Brazed Rotolock Sleeve included
SM/SZ084-090-100 Suction 1" 1/8 - -
Discharge 3/4" - -
SM/SZ110-112 Suction 1" 3/8 - -
Discharge 7/8" - -
SM/SZ120-124 Suction 1" 3/8 - -
Discharge 7/8" - -
SM/SZ147-SM148-161 Suction 1"3/8 - -
Discharge 7/8" - -
SM/SZ175-185 Suction 1" 5/8 2" 1/4 1" 3/8
Discharge 1" 1/8 1" 3/4 7/8"
SY240-300 Suction 1" 5/8 2" 1/4 1" 5/8
Discharge 1" 1/8 1" 3/4 1" 1/8
SY380 Suction 2" 1/8 - -
Discharge 1" 3/8 - -
12
15AB237986441643en-010801
Application Guidelines

Electrical data, connections and wiring
The terminal box is provided with a Ø 25.5 mm
and a Ø 29 mm knockouts.
Motor voltage
Motor voltage
code 3 Motor voltage code 4 Motor voltage code 6 Motor voltage code 7 Motor voltage code 9
Nominal voltage 50 Hz -380 - 400 V - 3 ph
380 - 415 V - 3 ph* 230 V - 3 ph 500 V - 3 ph -
Voltage range 50 Hz -342 - 440 V
342 - 457 V * 207 - 253 V 450 - 550 V -
Nominal voltage 60 Hz 200 - 230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
380 - 400 V - 3 ph*
Voltage range 60 Hz 180 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
342 - 440 V*
* SY 380
Wiring connections
Danfoss SM / SY / SZ scroll compressors are available in ve dierent motor voltages.
According to compressor model, electrical power is connected to the compressor terminals either by
4.8mm (10-32) screws or by M5 studs and nuts. In both cases the maximum tightening torque is 3 Nm.
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:
• Ø44 mm / Ø1"3/4 hole (for a 1"1/4 conduit) and
Ø34mm / Ø1"3/8 hole (for a 1" conduit),
• Ø32.1 mm / Ø1.26" hole & Ø25.4 mm / Ø1" hole
The 3 other knockouts are as follows:
• Ø20.5 mm / Ø0.81"
• Ø22 mm / Ø7/8" (for a 1/2" conduit)
• Ø16.5 mm / Ø0.65"
SM / SZ 084 - 090 - 100 - 110
- 112 - 120 - 124 - 147* -148*
- 161*
*Except for motor voltage
code 3
SM / SZ148 & 161 code
3-175-185 & SY185 - R & C
version
The terminal box is provided with a Ø 40.5
mm hole for power supply and a Ø 16.5 mm
knockout.
SM/SZ 147 code 3
Terminal box
Ø 25.5 mm knockout
Power supply
Ø 29 mm knockout
Ø 40.5 mm hole
Ø 16.5 mm
knockout Power supply
Cover holding screw (x2) - Torque: 2.2 Nm
Faston 1/4" tabs
Terminal box
Power supply
Sump heater
16 AB237986441643en-010801
Application Guidelines

Electrical data, connections and wiring
SY 240 – 300 – 380 &
SM/SZ 185 - P, X, Y versions
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 50.8 mm (UL 1"1/2 conduit) & Ø 43.7 mm (UL
1"1/4 conduit) & Ø 34.5 mm (UL 1" conduit)
• Ø 40.5 mm (ISO40) & Ø 32.2 mm (ISO32) & Ø
25.5 mm (ISO25)
• Ø 25.5 mm (ISO25)
The 4 others knockouts are as follows:
• Ø 22.5 mm (PG16) (UL 1/2") & Ø 16.5 mm
(ISO16) (x2)
• 20.7 mm (ISO20 or PG13.5) (x2)
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 6.3 mm size
Faston type.
The temperature inside the terminal box may not
exceed 70°C. Consequently, if the compressor is
installed in an enclosure, precautions must be
taken to avoid that the temperature around the
compressor and in the terminal box would rise
too much. The installation of ventilation on the
enclosure panels may be necessary. If not, the
electronic protection module may not operate
properly. Any compressor damage related to this
will not be covered by Danfoss warranty. In the
same manner, cables must be selected in a way
to insure that terminal box temperature does not
exceed 70°C.
The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated
cable glands are used.
• First numeral, level of protection against contact and foreign objects
5- Dust protected
• Second numeral, level of protection against water
4- Protection against water splashing.
Terminal box
temperature
LNS1 S2 M1 M2
L1 L2 L3
Black Blue Brown
Phase sequence input
Internal control contact
Safety
circuit
Thermistor
connection
Module power
IP rating
Black Blue
Brown
M1 - M2
Control circuit
Faston 1/4" tabs
Power supply
Sump heater
Module
power supply
}
}
17AB237986441643en-010801
Application Guidelines

Electrical data, connections and wiring
Three phase electrical
characteristics
Compressor model LRA MCC MMT Max. op. current Winding resistance
AAAAΩ
Motor voltage code 3
200-230V/3 ph/60 Hz
SM/SZ084 170 35 35 0.44
SM/SZ090 195 35 34 0.38
SM/SZ100 195 38 32 0.38
SM/SZ110 237 45 40 0.26
SM112 267 51 41 0.27
SM/SZ120 237 50 48 0.26
SM124 267 51 45 0.27
SM/SZ147 304 57 52 0.24
SM/SZ148 255 64 57 0.29
SM/SZ161 255 64 61 0.29
SM/SZ175 * 380 75 70 0.19
SM/SZ185 * 380 75 73 0.19
SY240 460 109 100 0.14
SY300 560 130 130 0.12
Motor voltage code 4
380-400V/3 ph/50 Hz
460V/3 ph/60 Hz
SM/SZ084 86 17 17 1.74
SM/SZ090 98 18.5 17 1.48
SM/SZ100 98 19 18 1.48
SM/SZ110 130 22 20 1.05
SM112 142 25 21 1.05
SM/SZ120 130 29 24 1.05
SM124 142 25 23 1.05
SM/SZ147 147 29 26 0.92
SM/SZ148 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
SY240 215 50 47 0.62
SY300 270 69 58 0.52
SY380 300 79 72.7 0.41
Motor voltage code 6
230V/3 ph/50 Hz
SM/SZ084 150 29 27 0.58
SM/SZ090 165 30 27 0.5
SM/SZ100 165 30 30 0.5
SM/SZ110 210 37 35 0.35
SM/SZ120 210 43 39 0.35
SM/SZ148 200 50 47 0.38
SM/SZ161 200 54 51 0.38
SM/SZ175 * 270 68 57 0.25
SM/SZ185 * 270 68 59 0.25
Motor voltage code 7
500V/3 ph/50 Hz
575V/3 ph/60 Hz
SM/SZ084 70 13 13 2.58
SM/SZ090 80 14 13 2.25
SM/SZ100 80 15 13 2.25
SM/SZ110 85 18 16 1.57
SM/SZ120 85 19 18 1.57
SM/SZ148 102 27 23 1.61
SM/SZ161 102 25 24 1.61
SM/SZ175 * 140 28 27 1.11
SM/SZ185 * 140 28 28 1.11
Motor voltage code 9
380V/3 ph/60 Hz
SM/SZ084 100 20 20 1.22
SM/SZ090 113 22 20 1.05
SM/SZ100 113 22 19 1.05
SM/SZ110 160 27 23 0.72
SM112 177 32 24 0.72
SM/SZ120 160 30 28 0.72
SM124 177 32 27 0.72
SM/SZ147 181 35 31 0.62
SM/SZ148 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
SY240 260 62 62 0.42
SY300 305 74 74 0.36
SY380 390 93 84.5 0.28
* For versions with electronic module, see datasheet for electrical data
18 AB237986441643en-010801
Application Guidelines

Electrical data, connections and wiring
Winding resistance is the resistance between
indicated terminal pins at 25°C (resistance value
+/- 7%).
Winding resistance is generally low and it
requires adapted tools for precise measurement.
Use a digital ohm-meter, a “4 wires” method and
measure under stabilised ambient temperature.
Winding resistance varies strongly with winding
temperature ; if the compressor is stabilised
at a dierent value than 25°C, the measured
resistance must be corrected with following
formula:
a + tamb
Ramb = R25°C __________
a + t25°C
t25°C : reference temperature = 25°C
tamb: temperature during measurement (°C)
R25°C: winding resistance at 25°C
Ramb: winding resistance at tamb
Coecient a = 234.5
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
of external overcurrent protection (thermal
overload relay or circuit breaker not provided
with compressor) must never exceed the MMT
value.
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 (+15°C evaporating temperature
and +68°C condensing temperature).
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.
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 application envelope. Above this value, the
internal motor protection or external electronic
module will cut-out the compressor to protect
the motor.
Locked Rotor Amp value is the higher current as
measured on mechanically blocked compressor
tested under nominal voltage. The LRA value
can be used as rough estimation for the starting
current. However in most cases, the real starting
current will be lower. A soft starter can be applied
to reduce starting current.
Winding resistance
MMT (Max Must Trip current)
Max. operating Current
MCC (Maximum Continuous
Current)
LRA (Locked Rotor Amp)
Danfoss MCI soft-start
controller
Compressor model Soft start reference
ambient max. 40°C Soft start reference ambient max. 55°C
SM/SZ084
MCI 15C
MCI 15C
SM/SZ090
SM/SZ100 MCI 25C
SM/SZ110
SM/SZ120
MCI 25C MCI 25C*SM112-124 - SM/SZ147
SM/SZ161-148
SM/SZ175-185
SY240-300-380 MCI 50CM *
* By-pass contactor (K1) required.
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
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.
19AB237986441643en-010801
Application Guidelines

Electrical data, connections and wiring
MCI with bypass contactor
General wiring
information
Input controlled soft start
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).
13-14 contact not applicable with MCI 25C
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 pump-
down cycles may be temporarily bypassed to
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 in table from“Low pressure”
section.
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.
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.
Compressor models SM / SZ 084 - 090 - 100 - 110 - 112 - 120 - 124 - 147 - 148 - 161
M
DGT
HP
LPS
180 s
TH
LP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
KM
L1 L3 L2
Q1
CONTROL CIRCUIT
F1F1
KM KA
KA KS
KS
KS
HP
DGT
TH
180 s
85 52 019 - A
T1 T2
M
T3
KA KA
A1
A2
A3
Wiring diagram without pump-down cycle
LPS
Suggested wiring diagrams logic
20 AB237986441643en-010801
Application Guidelines