Danfoss Maneurop MT R 22 Instruction Manual

www.danfoss.us.com
Application guidelines
Danfoss scroll compressors
SM - SY - SZ
R22 - R407C - R137a - R404A - R507A - 50 - 60 Hz
MAKING MODERN LIVING POSSIBLE

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
3
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.
SM SY SZ 084-090-100-110-120-148-161-175-185-240-300-380
First orbit:
SUCTION
Second orbit:
COMPRESSION
Third orbit:
DISCHARGE
Application guidelines
4FRCC.PC.003.A5.22

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.
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.
Heat shield that lowers the heat transfer between
discharge and suction gas and the acoustic level
R22 optimized scroll prole
Improved lower bearing centering
Patented motor centering spacer
Patented motor cap
New PTFE spring seal for even lower leaks
SM112-124-147 and SZ147
5
FRCC.PC.003.A5.22
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.
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.
Nomenclature
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
(and R407C for SY185-240-300)
SZ: Scroll, POE lubricant, R407C - R134a
(and R404A, R507A for SZ084 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
230 V
24 V AC
24 V AC
230 V
C: brazed
Motor protection type
V: brazed S 084-090-100-110-120-148-161
Applies to
S
R: rotolock
X
P: brazed
: brazed
: rotolock
CB
CA
Y: rotolock
C: brazed
PA
B: 115/230V
A: 24V AC
PB
P: rotolock A: 24V AC
CB
B: 115/230V
CA C: brazed A: 24V AC
B: 115/230V
Module voltageConnection
Internal thermostat
S 240 - 300
S 380
Electronic protection
module
S 175-185
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
Application guidelines
6FRCC.PC.003.A5.22

Technical specications
50 Hz data
Subject to modication without prior notication
For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg
Rating conditions
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 cu.in/rev cu.ft/h oz lbs
R22 SINGLE
SM084 720 400 69 600 6.12 3.33 11.4 6.99 703 112.08 141
SM090 7.5 21 800 74 400 6.54 3.33 11.4 7. 35 741 112.0 8 143
SM100 823 100 78 800 6.96 3.33 11.4 7.76 782 112.08 143
SM110 9 25 900 88 400 7. 82 3.32 11.3 8.80 886 112 .0 8 161
SM112 9.5 27 600 94 200 7.92 3.49 11.9 9.25 931 112.08 141
SM120 10 30 100 102 700 8.96 3.36 11.5 10.17 1024 112.08 161
SM124 10 31 200 106 500 8.75 3.56 12.2 10.34 1042 112.0 8 141
SM147 12 36 000 122 900 10.08 3.57 12.2 11. 81 119 0 112.08 148
SM148 12 36 100 123 200 10.8 3.34 11.4 12.14 1222 122.26 194
SM161 13 39 000 133 100 11.59 3.37 11. 5 13.22 1331 122.26 194
SM175 14 42 000 143 300 12.47 3.37 11. 5 14.22 1432 210.57 220
SM/SY185 15 45 500 155 300 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
R407C SINGLE
SZ084 7 19 300 65 900 6.13 3.15 10.8 6.99 703 112.08 141
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 8.80 886 112.08 161
SZ120 10 28 600 97 600 8.99 3.17 10.8 10.17 1024 112.0 8 161
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 122.26 194
SZ161 13 37 900 129 700 11. 84 3.21 11.0 13.22 1331 122.26 194
SZ175 14 40 100 136 900 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 72 800 248 100 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: www.danfoss.com/ODSG
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
7
FRCC.PC.003.A5.22
Application guidelines

Technical specications
60 Hz data
Subject to modication without prior notication
For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg
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
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 cu.in/rev cu.ft/h oz lbs
R22 SINGLE
SM084 724600 84 000 7.4 3.34 11.4 6.99 849 110 141
SM090 7.5 26400 90 100 7.8 3.37 11.5 7.35 894 110 143
SM100 827500 93 900 8.1 3.38 11. 5 7.76 943 110 143
SM110 931600 107 800 9.3 3.38 11. 5 8.80 1069 110 161
SM112 9.5 34000 116 000 9.6 3.53 12.1 9.25 1124 112 141
SM120 10 36 700 125 300 10.8 3.4 11. 6 10.17 1236 110 161
SM124 10.5 37 700 128 700 10.6 3.56 12.2 10.34 1257 112 142
SM147 12 43 600 148 800 12.2 3.58 12.2 11. 81 1435 112 148
SM148 12 43 800 149 500 13 3.37 11. 5 12.14 1476 122 194
SM161 13 47 600 162500 14.1 3.39 11.6 13.22 1606 122 194
SM175 14 51 100 174 400 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 1853 210 220
SY240 20 74 100 252 900 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 30 0 393 500 33.4 3.46 11. 8 32.42 3939 285 348
R407C SINGLE
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 7.35 894 110 143
SZ100 8 26 500 90 400 8.2 3.24 11.1 7.76 943 110 143
SZ110 9 30 100 102 700 9.3 3.24 11.1 8.80 1069 110 161
SZ120 10 34 800 118 800 10.7 3.24 11.1 10.17 1236 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 122 194
SZ161 13 46 000 157 000 14.3 3.21 11.0 13.22 1606 122 194
SZ175 14 48 700 166 200 15.3 3.19 10.9 14.22 1728 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: www.danfoss.com/ODSG
Application guidelines
8FRCC.PC.003.A5.22

Dimensions
SM/SZ 084-090-100-110-120
All dimensions in inch
Grommet
Ø 9.45
Ø 9.06
Ø 10
A: 18.29
B: 20.26
A: 15.02
B: 16.99
4.54
A: 11.60
B: 13.02
3.95
A: 20
B: 21.97
A: 9.92
B: 11.35
A: 5.59
B: 7.02
3.91
11.18
11.18
8.66
8.66
A: 6.42
B: 7.05
7.29
A: 6.17
B: 6.38
A: SM/SZ 084-090-100
B: SM/SZ 110-120
45°
30°
6.41 3.89
4 holes Ø 0.76
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
1.10 inch
Compressor
base plate
9
FRCC.PC.003.A5.22
Application guidelines

Dimensions
SM 112-124-SM/SZ147*
* except code 3
SM/SZ147 code 3
All dimensions in inch
Grommet
30 °
7.5
Ø 8.69
A: 21.06
B: 21.26
4.61
7.44
Ø 8.80
A: 10.84
B: 20.04
A: SM112
B: SM124-147
3.98
Ø 9.57
10.94
4 holes
Ø 0.75
60 °
7.09
6.06
9.06 7.5
6.81
30 °
9.06
Ø 8.82
Ø 9.57
4 holes
Ø 0.75
6.18
6.06
9.06
7.5
7.87
6.06
6.81
9.06 7.5
30°
30°
60°
3.98
20.04
21.26
10.94
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
1.10 inch
Compressor
base plate
Application guidelines
10 FRCC.PC.003.A5.22

Dimensions
SM/SZ 148-161
Grommet
All dimensions in inch
Ø 10.47
7.32
7.79
17.33
7.87
3.92
6.24 4 holes
Ø 0.76
6.8
8.66
8.66
11.18
14.08
8.23
11.18
SM 148-161 code 3 SM 148-161 code 4
30°
23.27
7.09
14.79
4.54
10.65
Ø10.47
3.92
17.33
7.36
13.03
3.89
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
1.10 inch
Compressor
base plate
11
FRCC.PC.003.A5.22
Application guidelines

Dimensions
SM/SZ 175-185 & SY185
Grommet
All dimensions in inch
7.96
6.57
26.69
25.25
7.80
20.81
9.34
7.09
4.33
Ø 10.08
Ø 10.47
Brazed version Rotolock version
Ø 12.45
7.67
6.74
13.60
4 holes
Ø 0.76
11
14.60
12
7.76 7.09
16.91
9.39
7.36
7.32
30°
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
1.10 inch
Compressor
base plate
Application guidelines
12 FRCC.PC.003.A5.22

Dimensions
SY/SZ 240-300-380
All dimensions in inch
Grommet
Lock washer * HM 10 Bolt *
Large flat *
1.06 inch washer
Steel mounting sleeve
Rubber grommet
Nut *
1.41 inch
Compressor base plate
* not supplied with compressor
7.36
35°
4 holes Ø0.98
15.43
15.43
12
7.95
8.11
7.32
17.87
11.58
7.62
30°
A: SY/SZ240
B: SY/SZ300
C: SY/SZ380
8.23
A&B: 15.83 - C: 16.54
5.5
Ø13.54
Discharge
A&B: 1”1/8
C: 1”3/8
Ø13.11
A: 27.2±2
B: 67.63±2
C: 28.58
A: 24.33
B: 24.76
C: 25.71
A: 18.88±1.2
B: 19.31±1.2
C: 20.26±1.2
Suction
A&B: 1”5/8
C: 2”1/8
8.50
7.7
3.43 3.86
6.29
90°
187
Discharge 1”1/8
Suction
A: 1”1/2
B: 1”5/8
15.91
A: SY/SZ240
B: SY/SZ300
15.90
8.19
90°
30°
35°
4 holes Ø0.98
15.43
15.43 12
7.95 7.32
17.87
11.58
7.62
8.23
5.5
Ø13.54
Ø13.11
A: 27.2±2
B: 67.63±2
A: 24.33
B: 24.76 A: 18.88±1.2
B: 19.31±1.2
8.50
7.7
3.43 3.86
6.29
Brazed version Rotolock version
13
FRCC.PC.003.A5.22
Application guidelines

Dimensions
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/SZ 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
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 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 UNF) which
may be used to determine the amount and
condition of the oil contained within the sump.
Model SM/SZ084-090-100-110-
120-148-161 SM/SZ 175 - SM/SZ/SY185 SM 112-124 - SM/SZ 147 SY/SZ 240 - 300 SY/SZ 380
Version VK-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
Brazed version Rotolock version
Brazed Rotolock Sleeve included
SM/SZ 084-090-100 Suction 1’’ 1/8 - -
Discharge 3/4’’ - -
SM/SZ 110-112-120-
124-147-SM148&161
Suction 1’’ 3/8 - -
Discharge 7/8’’ - -
SM/SZ 175-185 Suction 1’’ 5/8 2’’ 1/4 1’’ 3/8
Discharge 1’’ 1/8 1’’ 3/4 7/8’’
SY/SZ 240-300 Suction 1’’ 5/8 2’’ 1/4 1’’ 5/8
Discharge 1’’ 1/8 1’’ 3/4 1’’ 1/8
SY/SZ 380 Suction 2’’ 1/8 - -
Discharge 1’’ 3/8 - -
12
2
1
Application guidelines
14 FRCC.PC.003.A5.22

Electrical data, connections and wiring
The terminal box is provided with a Ø 1" and a
Ø 1.14" knockouts.
Motor voltage
Wiring connections
Danfoss SM / SY / SZ scroll compressors are available in ve dierent motor voltages.
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 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”
SM / SZ 084 - 090 - 100 - 110 - 112
- 120 - 124 - 147* -148* - 161*
*Except for motor voltage
code 3
SM / SZ 148 & 161 code 3-175-
185 & SY185 - R & C version
The terminal box is provided with a Ø 1.59" hole
for power supply and a Ø 0.65" knockout.
SM/SZ 147 code 3
Motor voltage
code 3 Motor voltage code 4 Motor voltage code 7 Motor voltage code 9
Nominal voltage 50 Hz - 380-400 V - 3 ph 500 V - 3 ph -
Voltage range 50 Hz -340-440 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
Voltage range 60 Hz 180 - 253 V 414 - 506 V 517 - 632 V 342 - 418 V
Terminal box
Ø 1 inch knockout
Power supply
Ø 1.14 inch knockout
Ø 1.59” hole
Ø 0.65”
knockout Power supply
Cover holding screw (x2) - Torque: 1.6 ft.lb
Faston 1/4" tabs
Terminal box
Power supply
Sump heater
15
FRCC.PC.003.A5.22
Application guidelines

Electrical data, connections and wiring
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.
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).
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 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.
IP rating
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)
Black Blue
Brown
M1 - M2
Control circuit
Faston 1/4” tabs
Power supply
Sump heater
Module
power supply
}
}
LN12 1412 11
Internal control contact
Safety
circuit
Thermistor
connection
Module power
LNS1 S2 M1 M2
L1 L2 L3
Black Blue Brown
Phase sequence input
Internal control contact
Safety
circuit
Thermistor
connection
Module power
Motor Protection
12
14
11
N
2
1
Module
L1
Cover holding screw (x2) - Torque: 1.6 ft.lb
Faston 1/4" tabs
Terminal box
Power supply
Sump heater
Protection module
power supply
Safety circuit
Application guidelines
16 FRCC.PC.003.A5.22

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
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.
Terminal box temperature
Electrical data, connections and wiring
Three phase electrical characteristics
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.
LRA (Locked Rotor Amp)
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
SM/SZ124 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
SY/SZ240 460 109 100 0.14
SY/SZ300 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
SM/SZ112 142 25 21 1.05
SM/SZ120 130 29 24 1.05
SM/SZ124 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
SY/SZ240 215 50 47 0.62
SY/SZ300 270 69 58 0.52
SY/SZ380 300 79 69 0.46
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
SY/SZ240 180 40 39 0.94
SY/SZ300 210 49 49 0.80
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
SM/SZ112 177 32 24 0.72
SM/SZ120 160 30 28 0.72
SM/SZ124 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
SY/SZ240 260 62 62 0.42
SY/SZ300 305 74 74 0.36
* For versions with electronic module, see datasheet for electrical data
17
FRCC.PC.003.A5.22
Application guidelines

Electrical data, connections and wiring
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:
a + tamb
Ramb = R77°F
a + t77°F
t77°F : reference temperature = 77°F
tamb: temperature during measurement (°F)
R77°F: winding resistance at 77°F
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 (59°F evaporating
temperature and 154.4°F 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.
Winding resistance
MMT (Max Must Trip current)
Max. operating Current
MCC (Maximum Continuous
Current)
Danfoss MCI soft-start
controller
Compressor model Soft start reference
ambient max. 104°F Soft start reference ambient max. 131°F
SM / SZ 084
MCI 15C
MCI 15C
SM / SZ 090
SM / SZ 100 MCI 25C
SM / SZ 110
SM / SZ 120
MCI 25C MCI 25C*
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.
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.
Application guidelines
18 FRCC.PC.003.A5.22

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 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.
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
Suggested wiring diagrams logic
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
19
FRCC.PC.003.A5.22
Application guidelines

Electrical data, connections and wiring
Compressor models SM / SZ 175 – 185 R and C version
Legends
Compressor models SY / SZ 240 - 300 - 380
Compressor models SM/SZ175-185 (J, K, P, S, U, W, X, Y versions)
Fuses F1
Compressor contactor KM
Control relay KA
Safety lock out relay KS
Optional short cycle timer (3 min) 180 s
External overload protection F2
Pump-down pressure switch LP
High pressure safety switch HP
Control device TH
Liquid Line Solenoid valve LLSV
Discharge gas thermostat DGT
Fused disconnect Q1
Motor safety thermostat thM
Compressor motor M
Motor Protection Module MPM
Thermistor chain S
Safety pressure switch LPS
CONTROL CIRCUIT
F1
F1
KA KAKA
HP
LPS T1 T2
T3
KM
DGT
KS
KS
12
M
ThM
KS
KS
KA
KM
KM
LLSV
180s
TH
F2
Q1
L1 L3 L2
A1
A2
A3
Wiring diagram with pump-down cycle
LP
CONTROL CIRCUIT
F1 F1
KA KA KA
HP
T1 T2
T3
KM
DGT
KS
KS
12
TH
KS
LPS
KA
KM
180s
F2
Q1
L1 L3 L2
M
ThM
A1
A2
A3
Wiring diagram without pump-down cycle
A1
A3
A2
MPM
S
LPS
Wiring diagram with pump-down cycle
LP
A1
A3
A2
MPM
S
KS
Wiring diagram without pump-down cycle
LPS
A1
A3
A2
LP
LPS
MPM
12 14
11 N
2 1
L1
S
Wiring diagram with pump-down cycle
A1
A3
A2
LPS MPM
12 14
11 N
2 1
L1
Wiring diagram without pump-down cycle
Application guidelines
20 FRCC.PC.003.A5.22