Danfoss Performer SM Series Instruction Manual

SELECTION & APPLICATION
GUIDELINES
Performer® scroll compressors
SM - SY - SZ - 50 / 60 Hz
R-22 - R-407C - R-134a - R-404A - R-507A
MAKING MODERN LIVING POSSIBLE
REFRIGERATION &
AIR CONDITIONING

PERFORMER® SCROLL COMPRESSION PRINCIPLE ..................................................................................................... 4
COMPRESSOR MODEL DESIGNATION ...................................................................................................................................................... 5
Nomenclature ......................................................................................................................................................................................................................................................... 5
Connection details ....................................................................................................................................................................................................................................... 5
TECHNICAL SPECIFICATIONS ........................................................................................................................................................................................ 6
50-Hz data ....................................................................................................................................................................................................................................................................... 6
60-Hz data ....................................................................................................................................................................................................................................................................... 7
OPERATING ENVELOPES ........................................................................................................................................................................................................... 8
Application envelopes at dew temperatures .................................................................................................................................... 8
Application envelopes at mean temperatures .............................................................................................................................. 10
PIPING CONNECTIONS ................................................................................................................................................................................................................... 11
Suction and discharge connections ....................................................................................................................................................................... 11
Sight glass ........................................................................................................................................................................................................................................................................ 11
Schrader valve ........................................................................................................................................................................................................................................................ 11
Oil drain ................................................................................................................................................................................................................................................................................. 11
ELECTRICAL CONNECTIONS AND WIRING .................................................................................................................................... 12
Motor voltage .......................................................................................................................................................................................................................................................... 12
Electrical connections ........................................................................................................................................................................................................................... 12
Suggested wiring diagrams logic ................................................................................................................................................................................ 14
Danfoss MCI soft-start controller .................................................................................................................................................................................. 15
SYSTEM DESIGN RECOMMENDATIONS ................................................................................................................................................ 17
Refrigerant charge limit and compressor protection ...................................................................................................... 17
Crankcase heater ................................................................................................................................................................................................................................. 17
Liquid line solenoid valve (LLSV) ....................................................................................................................................................................... 17
Pump-down cycle ............................................................................................................................................................................................................................ 17
Suction accumulator ................................................................................................................................................................................................................... 17
Liquid receiver .......................................................................................................................................................................................................................................... 18
Protection against flooded starts and liquid floodback .............................................................................. 18
Discharge gas temperature protection (DGT) .................................................................................................................... 18
Refrigerant charge limits and compressor protection ..................................................................................... 19
Motor protection ............................................................................................................................................................................................................................................. 20
Internal motor protection .............................................................................................................................................................................................. 20
External motor protection ............................................................................................................................................................................................ 20
Phase sequence and reverse rotation protection ...................................................................................................... 21
Cycle rate limit ........................................................................................................................................................................................................................................... 21
Voltage unbalance .......................................................................................................................................................................................................................... 22
High and low pressure protection ............................................................................................................................................................................ 22
High pressure ............................................................................................................................................................................................................................................. 22
Low pressure ............................................................................................................................................................................................................................................... 22
Internal pressure relief valve ...................................................................................................................................................................................... 23
Essential piping design considerations .......................................................................................................................................................... 23
CONTENTS

SPECIFIC APPLICATION RECOMMENDATIONS ................................................................................................................... 24
Low ambient compressor operations ............................................................................................................................................................... 24
Low ambient operation and minimum pressure differential .......................................................... 24
Low ambient start-up .............................................................................................................................................................................................................. 24
Head pressure control under low ambient conditions .................................................................................. 24
Crankcase heaters ............................................................................................................................................................................................................................ 24
Low load operations ................................................................................................................................................................................................................................ 25
Brazed plate heat exchangers ............................................................................................................................................................................................ 25
Reversible heat pump systems ......................................................................................................................................................................................... 25
Crankcase heaters ............................................................................................................................................................................................................................ 26
Discharge temperature thermostat ......................................................................................................................................................... 26
Discharge line & reversing valve ...................................................................................................................................................................... 26
Suction line accumulator ................................................................................................................................................................................................. 26
SOUND AND VIBRATION MANAGEMENT ........................................................................................................................................ 27
Sound generation in a refrigeration / air conditioning system ................................................................ 27
Compressor sound radiation ................................................................................................................................................................................... 27
Mechanical vibrations ............................................................................................................................................................................................................. 27
Gas pulsation .............................................................................................................................................................................................................................................. 27
INSTALLATION ................................................................................................................................................................................................................................................... 28
Compressor handling ............................................................................................................................................................................................................................ 28
Mounting .......................................................................................................................................................................................................................................................................... 28
Removing connections shipping plugs ........................................................................................................................................................ 29
System cleanliness ........................................................................................................................................................................................................................................ 29
Tubing ...................................................................................................................................................................................................................................................................................... 29
Filters driers ................................................................................................................................................................................................................................................................. 30
Brazing and soldering .......................................................................................................................................................................................................................... 30
Copper to copper connections .......................................................................................................................................................................... 30
Dissimilar metals connection ................................................................................................................................................................................. 30
Compressor connection .................................................................................................................................................................................................... 30
System pressure test ................................................................................................................................................................................................................................. 31
Leak detection ....................................................................................................................................................................................................................................................... 31
Vacuum pump-down and moisture removal ................................................................................................................................... 32
Refrigerant charging ............................................................................................................................................................................................................................... 32
Commissioning .................................................................................................................................................................................................................................................... 32
Oil level checking and top-up ............................................................................................................................................................................................ 32
Oil level check ........................................................................................................................................................................................................................................... 32
Oil top-up ........................................................................................................................................................................................................................................................... 32
ACCESSORIES ....................................................................................................................................................................................................................................................... 33
Connectors and valves ....................................................................................................................................................................................................................... 33
Lubricants ........................................................................................................................................................................................................................................................................ 33
Crankcase heaters ......................................................................................................................................................................................................................................... 34
Discharge temperature protection ......................................................................................................................................................................... 35
Compressor acoustic hood ....................................................................................................................................................................................................... 35
ORDERING INFORMATION AND PACKAGING ....................................................................................................................... 36
Ordering information ............................................................................................................................................................................................................................ 36
Packaging ........................................................................................................................................................................................................................................................................ 38
CONTENTS

First orbit:
SUCTION
Second orbit:
COMPRESSION
Third orbit:
DISCHARGE
4
PERFORMER® SCROLL COMPRESSION PRINCIPLE
In a Danfoss Performer® scroll
compressor, compression is performed
by two scroll elements located above
the motor (see adjacent figure). Suction
gas enters the compressor at the suction
connection, enters at the bottom of the
motor housing and flows around the
motor. Oil droplets separate from the
suction gas and fall into the oil sump. All
suction gas passes around the electric
motor, ensuring complete motor
cooling in all applications. After cooling
the electric motor, the gas enters the
scroll elements where compression
takes place.
A check valve is located directly above
the fixed scroll discharge port; this
feature prevents the compressor from
running backwards once the power has
been switched off.
The figure below illustrates the entire
compression process.
Therearetwoscrollelements:anorbiting
scroll and a fixed scroll. The center of
the orbiting scroll traces a circular path
around the center of the fixed scroll.
This movement creates symmetrical
compression pockets between the two
scroll elements. Low pressure gas is
trapped in 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 toward the center of
the scroll .
During three complete orbits the pocket
of gas becomes smaller and pressure
rises. After the third orbit, the gas, at
maximum pressure, has reached the
central discharge port where it leaves
the compressor.
Compression in a scroll is a continuous
process: when one pocket of gas is being
compressed during its second orbit,
another quantity is entering the scrolls
and yet another is being discharged all
at the same time.

Family, lubricant &
refrigerant
SM: Scroll, mineral oil, for R-22
SY: Scroll, POE lubricant, for R-22
SZ: Scroll, POE lubricant, for R-407C - R-134a
Family,
lubricant
& refrigerant
Nominal
capacity Voltage Version Evolution
Index
Version
A9S Y A A A3 0 0
C4S Z S R1 8 5
Nominal capacity
in thousand Btu/h at 60 Hz,
R-22, ARI conditions
UL index
Voltage
Motor voltage code:
3: 200-230/3/60
4: 380-400/3/50 - 460/3/60
6: 230/3/50
7: 500/3/50 - 575/3/60
9: 380/3/60
Internal
overload
protector
VV: brazed S 084 - 090
100 - 110 - 120
148 - 161
Internal
thermostat
C C: brazed
S 115 - 125
160 - 175 - 185
R R: rotolock
Electronic
protection
module
AA
AB
MA
MB
A: brazed A: 24V
A: brazed B: 115/230V
M: rotolock A: 24V
M: rotolock B: 115/230V
S 240* - 300*
- 380*
Motor
protection
type

Applies to

Description

*For trio assemblies, please contact Danfoss
5
Model SM/SZ 084 - 090 - 100
110 - 120 - 148 - 161
SM/SZ 115 - 125 - 160 -
175 - 185 SY/SZ 240 - 300 SY/SZ 380
Version V R C MA
MB
AA
AB
AA
AB
Suction and discharge
connection brazed rotolock brazed rotolock brazed brazed
Oil sight glass threaded threaded threaded threaded threaded threaded
Oil equalization connection 3/8’’ flare 3/8’’ flare 3/8’’ flare 1/2’’ flare 1/2’’ flare 1/2’’ flare
Oil drain connection - 1/4’’ NPT 1/4’’ NPT 1/4’’ NPT 1/4’’ NPT 1/4’’ NPT
Low pressure gauge port
(schrader) 1/4’’ flare 1/4’’ flare 1/4’’ flare 1/4’’ flare 1/4’’ flare 1/4’’ flare
COMPRESSOR MODEL DESIGNATION
Performer® scroll compressors are
available both as single compressors
and as tandem units. The example
below presents single compressor
nomenclature.
For tandem assemblies, please refer
to the Performer® Parallel Application
Guidelines documentation.
Nomenclature
Connection details

6
Model
Nominal
Cap. 60 Hz
TR
Nominal cooling
capacity**
W Btu/h
Power
input
kW
A max
(code 4)
A
Eciency Sound
power
dB(A)
Swept
volume
cu.in/rev
Displace-
ment
cu.ft/h
Oil
charge
oz
Net
weight
lb*
COP
W/W
E.E.R.
Btu/h /W
R-22 SINGLE
SM084 7 20400 69 600 6.12 17 3.33 11.4 70 6.99 703 111.6 159
SM090 7.5 21800 74 400 6.54 17 3.33 11.4 70 7.35 741 111.6 159
SM100 8 23100 79 000 6.96 19 3.33 11.3 70 7.76 782 111.6 159
SM110 9 25900 88 600 7.82 20 3.32 11.3 75 8.80 886 111.6 176
SM115 9.5 28000 95 600 8.31 25 3.37 11.5 76 9.46 952 128.5 176
SM120 10 30100 102 800 8.96 29 3.36 11.5 75 10.17 1024 111.6 176
SM125 10 30100 102 800 8.93 25 3.37 11.5 76 10.17 1024 128.5 176
SM148 12 36100 123 100 10.80 32 3.34 11.4 79 12.14 1222 121.7 176
SM160 13 39100 133 500 11.60 29 3.37 11.5 79.5 13.22 1331 135.3 207
SM161 13 39000 133 200 11.59 32 3.37 11.5 79.5 13.22 1331 121.7 190
SM175 14 42000 143 400 12.46 35 3.37 11.5 80 14.22 1432 209.6 227
SM185 15 45500 155 300 13.62 35 3.34 11.4 80 15.25 1535 209.6 227
SY240 20 61200 208 700 18.20 50 3.36 11.5 82 21.22 2137 270.5 353
SY300 25 78200 267 000 22.83 69 3.43 11.7 82 26.70 2687 270.5 353
SY380 30 92000 313 900 26.82 79 3.43 11.7 85 32.42 3263 284.0 359
TECHNICAL SPECIFICATIONS
50 Hz data
Subject to modification without prior notification
For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg
SM/SY compressors SZ compressors
Refrigerant R-22 R-407C
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)
Subcooling 15 °F 15 °F
Superheat 20 °F 20 °F
Rating conditions
TR = Ton of Refrigeration
COP = Coefficient Of Performance
EER = Energy Efficiency Ratio
R-407C SINGLE
SZ084 7 19300 66 000 6.13 17 3.15 10.7 71 6.99 703 111.6 159
SZ090 7.5 20400 69 600 6.45 17 3.16 10.8 72 7.35 741 111.6 159
SZ100 8 21600 73 700 6.84 19 3.15 10.8 73 7.76 782 111.6 159
SZ110 9 24600 84 000 7.76 20 3.17 10.8 77 8.80 886 111.6 176
SZ115 9.5 26900 91 700 8.49 25 3.16 10.8 77 9.46 952 128.5 176
SZ120 10 28600 97 600 8.98 29 3.18 10.9 77 10.17 1024 111.6 176
SZ125 10 28600 97 500 8.95 25 3.19 10.9 78 10.17 1024 128.5 176
SZ148 12 35100 119 800 10.99 32 3.19 10.9 79 12.14 1222 121.7 176
SZ160 13 37600 128 200 11.58 29 3.24 11.1 80.5 13.22 1331 135.3 207
SZ161 13 37900 129 500 11.83 32 3.21 10.9 79 13.22 1331 121.7 190
SZ175 14 40100 136 900 12.67 35 3.17 10.8 81 14.22 1432 209.6 227
SZ185 15 43100 147 100 13.62 35 3.16 10.8 81 15.25 1535 209.6 227
SZ240 20 59100 201 800 18.60 50 3.18 10.9 83.5 21.22 2137 270.5 353
SZ300 25 72800 248 300 22.70 69 3.20 10.9 84 26.70 2687 270.5 353
SZ380 30 89600 305 900 27.60 79 3.25 11.1 86.5 32.42 3263 284.0 359
* with oil charge & accessories
** at nominal speed
2900 rpm at 50 Hz
3500 rpm at 60Hz

7
Model
Nominal
Cap. 60 Hz
TR
Nominal cooling
capacity**
W Btu/h
Power
input
kW
A max
(code 4)
A
Eciency Sound
power
dB(A)
Swept
volume
cu.in/rev
Displace-
ment
cu.ft/h
Oil
charge
oz
Net
weight *
lb
COP
W/W
E.E.R.
Btu/h /W
R-22 SINGLE
SM084 7 24600 84 000 7.38 17 3.34 11.4 74 6.99 703 111.6 141
SM090 7.5 26400 90 000 7.82 17 3.37 11.5 75 7.35 741 111.6 143
SM100 8 27500 94 000 8.14 19 3.38 11.5 75 7.76 782 111.6 143
SM110 9 31600 107 800 9.35 20 3.38 11.5 78 8.80 886 111.6 161
SM115 9.5 33700 115 200 10.08 25 3.35 11.4 79 9.46 952 128.5 172
SM120 10 36700 125 300 10.80 29 3.40 11.6 78 10.17 1024 111.6 161
SM125 10 37000 126 400 10.99 25 3.37 11.5 79 10.17 1024 128.5 172
SM148 12 43800 149 500 13.01 32 3.37 11.5 83 12.14 1222 121.7 194
SM160 13 47700 163 000 14.22 29 3.36 11.5 84 13.22 1331 135.3 198
SM161 13 47600 162 600 14.07 32 3.39 11.5 84 13.22 1331 121.7 194
SM175 14 51100 174 300 15.27 35 3.34 11.4 82.5 14.22 1432 209.6 220
SM185 15 54300 185 400 16.22 35 3.35 11.4 82.5 15.25 1535 209.6 220
SY240 20 74100 252 700 22.10 50 3.35 11.4 84.7 21.22 2137 270.5 331
SY300 25 94500 322 500 27.50 69 3.43 11.7 85.9 26.70 2687 270.5 346
TECHNICAL SPECIFICATIONS
60 Hz data
Subject to modification without prior notification
For full data details and capacity tables refer to Online Datasheet Generator : www.danfoss.com/odsg
SM/SY compressors SZ compressors
Refrigerant R-22 R-407C
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)
Subcooling 15 °F 15 °F
Superheat 20 °F 20 °F
TR = Ton of Refrigeration
COP = Coefficient Of Performance
EER = Energy Efficiency Ratio
Rating conditions
R-407C SINGLE
SZ084 7 22500 76 900 7.06 17 3.19 10.9 74 6.99 703 111.6 141
SZ090 7.5 24400 83 300 7.63 17 3.20 10.9 77 7.35 741 111.6 143
SZ100 8 26500 90 500 8.18 19 3.24 11.0 77 7.76 782 111.6 143
SZ110 9 30100 102 800 9.29 20 3.24 11.1 81 8.80 886 111.6 161
SZ115 9.5 32800 112 000 10.22 25 3.21 10.9 81 9.46 952 128.5 172
SZ120 10 34800 118 900 10.75 29 3.24 11.1 81 10.17 1024 111.6 161
SZ125 10 34900 119 200 10.89 25 3.21 10.9 81 10.17 1024 128.5 172
SZ148 12 42600 145 400 13.35 32 3.19 10.9 83 12.14 1222 121.7 194
SZ160 13 45500 155 400 14.08 29 3.23 11.0 83 13.22 1331 135.3 198
SZ161 13 46000 156 900 14.32 32 3.21 10.9 83 13.22 1331 121.7 194
SZ175 14 48700 166 200 15.28 35 3.19 10.9 84 14.22 1432 209.6 220
SZ185 15 51800 176 800 16.43 35 3.15 10.7 84 15.25 1535 209.6 220
SZ240 20 71100 242 800 22.70 50 3.14 10.7 87 21.22 2137 270.5 331
SZ300 25 87900 300 000 27.49 69 3.20 10.9 87.5 26.70 2687 270.5 346
SZ380 30 108500 368 500 33.40 79 3.25 11.0 89.5 32.42 3263 284 348
* with oil charge & accessories
** at nominal speed
2900 rpm at 50 Hz
3500 rpm at 60Hz

80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
Condensing temp. limits
S.H. = 20oF
S.H. = 54oF
SUPERHEAT
8
OPERATING ENVELOPES
The figures below show the operat-
ing envelopes for SM / SY compres-
sors with refrigerant R-22 and for SZ
compressors with refrigerants R-407C,
R-134a, R-404A and R-507A. Operat-
ing limits define the envelope within
which reliable compressor operation
is guaranteed.
Because discharge temperature de-
pends on the combination of evapo-
rating temperature, condensing tem-
perature and suction gas superheat,
discharge temperature limits are
indicated by a double line. The solid
line represents the limit when the su-
perheat is 20oF or less. The dotted line
shows the limit when the superheat is
54oF. Interpolate for superheat values
between 20oF and 54oF.
•Maximum discharge gas tem-
perature: +275oF
• Maximum ambient temperature:
+145oF (for SM / SZ 084 to 185),
+125oF (for SY / SZ 240 to 380)
• A suction superheat below 10oF is not
recommended due to risk of liquid
floodback
• Maximum superheat: 54oF
• Minimum and maximum evapo-
rating and condensing temperatures
as per the operating envelopes.
SM 084 to SM 185
SY 240 to SY 380
R-22
SZ 084 to SZ 185
R-134a
Application envelopes
at dew temperatures
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
Condensing temp. limits
S.H. = 20oF
S.H. = 54oF
SUPERHEAT

Condensing temp. limits
S.H. = 20oF
80
90
100
110
120
130
140
150
160
0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
S.H. = 54oF
SUPERHEAT
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating tem perature [°F]
Condensing temperature [°F]
Condensing temp. limits
S.H. = 20oF
S.H. = 54oF
SUPERHEAT
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
Condensing temp. limits
S.H. = 20
o
F
S.H. = 54
o
F
SUPERHEAT
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
Condensing temp. limits
S.H. = 20oF
S.H. = 54oF
SUPERHEAT
80
90
100
110
120
130
140
150
160
9
SZ 240 - 300
R-134a
SZ 240 to SZ 380
R-407C
at DEW temperature
(refer to the explanation p.10)
SZ 084 to SZ 185
R-407C
at DEW temperature
(refer to the explanation p.10)
SZ 084 to SZ 185
R-404A / R-507A
OPERATING ENVELOPES

pressure (log)
enthalpy
Dew
Dew
Mean
Mean
Condensing temp. limits
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
S.H. = 20oF
S.H. = 54oF
SUPERHEAT
Condensing temp. limits
S.H. = 20oF
S.H. = 54oF
SUPERHEAT
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Evaporating temperature [°F]
Condensing temperature [°F]
10
Application envelopes at
mean temperatures
Dew temperature and
mean temperature for
R-407C
OPERATING ENVELOPES
The following operating diagrams
show the difference between mean
and dew temperature application
envelopes.
Dew temperature
Mean temperature
Example for SZ 084 to 185
Example for SZ 084 to 185
Refrigerant R-407C is a zeotropic mix-
ture with a temperature glide in both
evaporator and condenser. Therefore,
when discussing evaporating and
condensing temperatures, it is im-
portant to indicate whether these are
DEW POINT values or MEAN values.
In the figure below, the dashed lines
reflect constant temperature and do
not correspond with the constant
pressure lines. For a given cycle, the
MEAN point temperatures are typi-
cally about 3.5° to 5.5°F lower than
DEW point temperatures. In these
Selection and Application Guidelines,
we displays temperatures as DEW
point values.
The performance tables for R-407C
(see p. 6-7) are also based on DEW
point values.

Oil fill
connection
and
gauge port
Oil drain
connection
11
Brazed version Rotolock version
Brazed Rotolock Sleeve included
SM / SZ 084 Suction 1’’ 1/8 - -
Discharge 3/4’’ - -
SM / SZ 090 Suction 1’’ 1/8 - -
Discharge 3/4’’ - -
SM / SZ 100 Suction 1’’ 1/8 - -
Discharge 3/4’’ - -
SM / SZ 110 Suction 1’’ 3/8 - -
Discharge 7/8’’ - -
SM / SZ 115 Suction 1’’ 3/8 1’’ 3/4 1’’ 1/8
Discharge 7/8’’ 1’’ 1/4 3/4’’
SM / SZ 120 Suction 1’’ 3/8 - -
Discharge 7/8’’ - -
SM / SZ 125 Suction 1’’ 3/8 1’’ 3/4 1’’ 1/8
Discharge 7/8’’ 1’’ 1/4 3/4’’
SM / SZ 148 Suction 1’’ 3/8 - -
Discharge 7/8’’ - -
SM / SZ 161 Suction 1’’ 3/8 - -
Discharge 7/8’’ - -
SM / SZ 160 Suction 1’’ 5/8 2’’ 1/4 1’’ 3/8
Discharge 1’’ 1/8 1’’ 3/4 7/8’’
SM / SZ 175 Suction 1’’ 5/8 2’’ 1/4 1’’ 3/8
Discharge 1’’ 1/8 1’’ 3/4 7/8’’
SM / SZ 185 Suction 1’’ 5/8 2’’ 1/4 1’’ 3/8
Discharge 1’’ 1/8 1’’ 3/4 7/8’’
SY / SZ 240 Suction 1’’ 5/8 2’’ 1/4 1’’ 5/8
Discharge 1’’ 1/8 1’’ 3/4 1’’ 1/8
SY / SZ 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 - -
Suction and discharge
connections
PIPING CONNECTIONS
Oil drain
Sight glass
Schrader
The oil drain connection allows oil
to be removed from the sump for
changing, testing, etc. The fitting
contains an extension tube into the oil
sump for more effective oil removal.
The connection is female 1/4" NPT .
Note: on SY/SZ 240-380, it is not
possible to drain oil from the suction
connection.
The oil fill connection and gauge port
is a 1/4" male flare connector that
incorporates a Schrader valve.
All Performer® scroll compressors
come equipped with a sight glass that
may be used to determine the amount
and condition of the oil in the sump.
12
12

Terminal box
Power supply
ø 1.1" knockout
Cover
holding
screw
(x2)
Torque:
1.6 ft lb
Discharge gas thermostat kit
(optional)
Discharge gas pipe
Belt type
cranckase
heater
(optional)
1/4” spade
connector
Safety control circuit
motor thermostat
Terminal box
Power supply
Discharge gas thermostat kit
(optional)
Discharge gas pipe
Belt type cranckase
heater (optional)
Terminal box
Power supply
12
Terminal box wiring for
SM / SZ 084 - 090 - 100 -
110 - 120 - 148* - 161*
compressors
* Except for motor voltage code 3
ELECTRICAL CONNECTIONS AND WIRING
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 - 380-400V - 3 - 50 Hz 230V - 3 - 50 Hz 500V - 3 - 50Hz -
Voltage range 50 Hz - 340-440V 207 - 253V 450 - 550V -
Nominal voltage 60 Hz 200-230V - 3 - 60 Hz 460V - 3 - 60 Hz - 575V - 3 - 60 Hz 380 - 3 - 60 Hz
Voltage range 60 Hz 180 - 253 V 414 - 506V - 517 - 632V 342 - 418 V
Electrical connections
• The terminal box is provided with a
Ø 1.1” (29 mm) hole for the power
supply and a Ø 1.1” (29 mm) knockout.
• The protection rating of the terminal
box is IP54 when correctly sized IP54-
rated cable glands are used.
IP ratings according to IEC 529
The terminal box is provided with
2 double knockouts for the power
supply and 3 knockouts for the safety
control circuit.
Performer® scroll compressors are
available for five different motor
voltages. Motor voltage codes 3 and
9 are for 60 Hz only, code 6 for 50 Hz
only, and codes 4 and 7 for both 50
and 60 Hz.
Electrical power is connected to the
compressor terminals by Ø 3/16” (4.8
mm) screws. The maximum tightening
torque is 2.2 ft.lb. Use a 1/4’’ ring
terminal on the power leads.
Terminal box wiring for
SM / SZ 115 - 125 - 160 -
175 - 185 compressors
Terminal box wiring for
SM / SZ 148 - 161
compressors
motor voltage code 3

The 2 double power supply knockouts
accommodate the following diameters:
Ø 1”3/4 / Ø 44 mm (for 1”1/4 conduit)
Ø 1”3/8 / Ø 34mm (for 1” conduit),
Ø 1.26” / Ø 32.1 mm and
Ø 1” / Ø 25.4 mm
The 3 additional knockouts are :
Ø 0.81” / Ø 20.5 mm
Ø 7/8” / Ø 22 mm (for 1/2” conduit)
Ø 0.65” / Ø 16.5 mm
The protection rating of the terminal
box is IP54 when correctly sized IP54-
rated cable glands are used.
Connect the internal safety thermostat
with 1/4” female spade connectors.
Discharge gas thermostat kit (optional)
Discharge gas pipe
Belt type
cranckase
heater
Cover holding screws (x4)
Torque: 7.6 lb ft
Power supply
M1, M2
Control circuit
Power supply
Black
Blue
Brown
Phase sequence input
Internal control contact
Safety
circuit
Thermistor
connection
Module power
24 or 115/230 vac
13
ELECTRICAL CONNECTIONS AND WIRING
The motor protection module is
factory-installed in the terminal
box and has both phase sequence
protection and pre-wired thermistor
connections. The module must be
connected to a power supply of
appropriate voltage. The module
terminals are 1/4” size Faston type.
Terminal box wiring for
SY / SZ 240 – 300 – 380
Electronic protection
module wiring
The terminal box is provided with 4
double power supply knockouts and
4 knockouts for the safety control
circuit. The power supply knockouts
accommodate have these diameters:
Ø 7/8” / Ø 22 mm and
Ø 0.65” / Ø 16.5 mm
Ø 7/8” / Ø 22 mm and
Ø 0.65” / Ø 16.5 mm
Ø 1”23/32 / Ø 43.7 mm and
Ø 1”23/64 / Ø 34.5 mm
Ø 1.59” / Ø 40.5 mm and
Ø1.27” / Ø 32.2 mm
The 4 other knockouts are:
Ø 0.81” / Ø 20.5 mm
Ø 0.81” / Ø 20.5 mm
Ø 1” 31/32 / Ø 50 mm
Ø 0.99” / Ø 25.2 mm
The protection rating of the terminal
box is IP54 when correctly sized IP54-
rated cable glands are used.
IP ratings according to IEC 529.

T T
TH
TH
KA
A1
A2 A3A1
180 s
A2 KA
~
~
Suggested wiring diagrams
Compressor models SM / SZ 084 – 090 – 100 – 110 – 120 – 148 - 161
M
DGT
HP
180 s
TH
BP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
F2
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
KM
L1 L3 L2
Q1
F2
CONTROL CIRCUIT
F1
F1
KM KA
KA KS
KS
KS
BP
HP
DGT
TH
180 s
T1 T2
M
T3
KA KA
A1
A2
A3
Wiring diagram without pump-down cycle
Suggested wiring diagrams
Compressor models SM / SZ 115 – 125 – 160 – 175 – 185
Wiring diagram with pump-down cycle
CONTROL CIRCUIT
F1
F1
KA KAKA
HP
T1 T2
T3
KM
DGT
KS
KS
12
M
KS
KS
BP
KA
KM
KM
LLSV
180s
TH
F2
Q1
L1 L3 L2
A1
A2
A3
CONTROL CIRCUIT
F1 F1
KA KA KA
HP
T1 T2
T3
KM
DGT
KS
KS
12
TH
KS
BP
KA
KM
180s
F2
Q1
L1 L3 L2
M
A1
A2
A3
Wiring diagram without pump-down cycle
14
ELECTRICAL CONNECTIONS AND WIRING
Short cycle timer function

A1
A3
A2
Wiring diagram with pump-down cycle
A1
A3
A2
Wiring diagram without pump-down cycle
15
Danfoss MCI
soft-start controller
ELECTRICAL CONNECTIONS AND WIRING
Legends
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 115 -125
MCI 25C MCI 25C*
SM / SZ 120
SM / SZ 160 - 161 - 148
SM / SZ 175 - 185
SY / SZ 240 - 300 - 380 MCI 50CM
* By-pass contactor (K1) required.
See application example p.16
Suggested wiring diagrams
Compressor models SY / SZ 240 - 300 - 380
For Performer® scroll compressors
with motor code 4 (400V / 3 / 50Hz
or 460V / 3 / 60Hz) the inrush current
can be reduced by use of a Danfoss
digitally-controlled MCI compressor
soft starter. MCI soft starters are
designed to reduce the starting
and stopping current of 3-phase AC
motors; MCI soft starters can reduce
in-rush current by up to 40%, thereby
eliminating the detrimental effects
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 and
initial torque, are preset at the factory
and do not require modification.
Control device .........................................................TH
Optional short cycle timer (3 min) ................180 s
Control relay ............................................................KA
Liquid line solenoid valve................................. LLSV
Compressor contactor .........................................KM
Safety lock out relay .............................................. KS
Pump-down control & L.P. switch...................... BP
H.P. safety switch....................................................HP
Fused disconnect....................................................Q1
Fuses ...........................................................................F1
External overload protection...............................F2
Compressor motor ...................................................M
Motor safety thermostat ................................... thM
Discharge gas thermostat.................................DGT
Motor protection module ............................... MPM
Thermistor chain .......................................................S

16
MCI with
bypass contactor
Input controlled
soft start
ELECTRICAL CONNECTIONS AND WIRING
By means of the built-in auxiliary
contact (23-24) the bypass function is
easily achieved (see wiring diagram
below).
No heat is generated by the MCI.
As the contactor always switches in
no-load condition it can be selected
on the basis of the thermal current
(AC-1).
(Contacts 13-14 are not applicable with
MCI 25C)
When 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
off instantaneously.

17
SYSTEM DESIGN RECOMMENDATIONS
Refrigerant charge
limit and compressor
protection
Crankcase heater
Liquid line solenoid valve
(LLSV)
Pump-down cycle
Suction accumulator A suction accumulator offers protec-
tion against refrigerant floodback at
start-up, during operation, or after
heat pump defrosting. Sustained and
repeated liquid slugging and flood-
back can seriously impair the oil’s
ability to lubricate. The suction line
accumulator also protects against
off-cycle migration by providing addi-
tional internal free volume on the low
side of the system. The accumulator
should be sized for not less than 50%
of the total system charge. Tests must
be conducted to determine the actual
refrigerant-holding capacity needed
for the application.
Performer® scroll compressors incor-
porate internal safety devices such
as motor temperature protection,
reverse rotation protection, and a
discharge gas check valve. Additional
safety devices or system components,
however, may be required to en-
sure adequate protection of the
compressor. Depending on the system
configuration and application, one
or several of the following methods
should be considered.
When the compressor is idle, the oil
temperature in the sump must be
at least 18oF above the saturation
temperature of the refrigerant on the
low pressure side. This ensures that
liquid refrigerant does not accumulate
in the sump. A crankcase heater is
only effective if capable of sustaining
a temperature difference of 18°F
or more. Tests must be conducted
to ensure that the appropriate oil
temperature is maintained under all
ambient conditions (temperature and
wind).
Below 23°F ambient temperature with
wind speed above 11 mph, however,
we recommend thermal insulation
of crankcase heaters in order to limit
the energy losses to the surrounding
air. Since the total system charge may
be undefined, a crankcase heater is
recommended on all stand-alone
compressors and split systems. In
addition, any system containing a
refrigerant charge in excess of the
maximum recommended system
charge for compressors requires a
crankcase heater. A crankcase heater
is also required on all reversible cycle
applications.
Notes: Belt-type crankcase heater
accessories are available from
Danfoss (see page 34). The heater
must be energized for a minimum of
12 hours before initial start-up (with
compressor service valves open), and
must remain energized whenever the
compressor is off. Provide separate
electrical supply for the heaters so that
they remain energized even when the
machine is out of service (eg. seasonal
shutdown).
An LLSV may be used to isolate the
liquid charge on the condenser side,
thereby preventing charge transfer or
excessive migration to the compressor
during off-cycles.
The quantity of refrigerant on the
low pressure side of the system can
be further reduced by using a pump-
down cycle in association with the
LLSV.
A pump-down cycle is one of the
most effective ways to protect against
the off-cycle migration of liquid
refrigerant. Once the low pressure
cut off is activated, a solenoid valve
closes on the condenser outlet.
The compressor then pumps the
majority of the system charge into the
condenser, and the system stops on
the low pressure switch. This reduces
the amount of charge on the low side
and prevents off-cycle migration.
Recommended settings for the low
pressure switch can be found in the
table on p. 22. For suggested wiring
diagrams, please see p. 14-15.

18
DGT protection is required if the high
and low pressure switch settings
do not protect the compressor
against operating beyond its specific
application envelope. Please refer to
the examples on page 18, which show
(1) where DGT protection is required
(example 1) and (2) where it is not
(example 2).
Every heat pump must have a
discharge temperature protection
device. In reversible air-to-air and air-
to-water heat pumps the discharge
temperature must be monitored
during development tests by the
equipment manufacturer.
A flooded start occurs when there is
a large quantity of liquid refrigerant
in the compressor. Liquid finds its
way into a compressor by means of
off-cycle migration. Liquid floodback
occurs when liquid refrigerant returns
to a compressor while it is running.
Excessive liquid refrigerant in the
compressor will cause oil dilution,
washout of oil from the bearings, or
lossof oil from the sump.Thecrankcase
heater will not be effective if the
system design allows for uncontrolled
floodback to the compressor during
running or starting.
Performer® scroll compressors can
tolerate occasional flooded starts
as long as the system charge does
not exceed that given in the table in
the following section. Performer®
scrolls can also handle intermittent
floodback, but system design must
be such that repeated and excessive
floodback is not possible.
Off-cycle refrigerant migration occurs
when the compressor is located at
the coldest part of the installation,
when the system uses a bleed-type
expansion device, or if liquid can
migrate from the evaporator into
the compressor sump by gravity. If
the system charge exceeds the limit
shown in the table, a crankcase heater
must be used.
During operation, liquid floodback
may be detected by measuring either
the oil sump temperature, which
should be at least 18°F above the
saturated suction temperature, or the
discharge gas temperature, which
should be at least 54°F above the
saturated discharge temperature.
If at any time during operation the
oil sump temperature drops below
18oF above the saturated suction
temperature, or if discharge gas
temperature falls below 54°F above
the saturated discharge temperature,
the lubricant will become excessively
diluted and tests will have to be
performed in order to select an
appropriate method for compressor
protection. Repetitive liquid floodback
testing must be carried out under
TXV threshold operating conditions:
high pressure ratio and minimum
load, with the measurement of both
suction superheat and discharge gas
temperature.
Liquid receiver
Protection against flooded
starts and liquid floodback
A liquid receiver is strongly recom-
mended on split systems and remote
condenser systems with a total
refrigerant charge in excess of the
recommended maximum for the
compressor. Because of their long
refrigerant lines, such systems have
a relatively high system charge that
is hard to define with accuracy. Also,
these systems quite often tend to be
overcharged in the field. By installing
a liquid receiver, a pump-down cycle
can be introduced in order to safely
store the refrigerant charge during
off-cycles, greatly reducing the chance
of refrigerant migration back to the
compressor.
On unitary or close-coupled systems,
where the system refrigerant charge
is expected to be both correct and
definable, the entire system charge
may be stored in the condenser during
pump-down if all components have
been properly sized.
Discharge gas temperature
protection (DGT)
SYSTEM DESIGN RECOMMENDATIONS

65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
Evap. Temp. (°F)
Cond. Temp. (°F)
LP 1 LP 2
HP 1
HP 2
R410A
DGT - limit
Example 1
Example 2
19
SYSTEM DESIGN RECOMMENDATIONS
The DGT should be set to open at
a discharge gas temperature of 275oF
Notes: The compressor must not be
allowed to cycle on the discharge gas
thermostat. Continuous operation
beyond the compressor’s operating
range will cause serious damage to
the compressor!
A DGT accessory is available from
Danfoss: refer to page 35.
Refrigerant charge limits
and compressor protection
Compressor models S 0 84 - 090
- 100 S 110 - 120 S 115 - 125 S 148 - 160
- 161 S 175 - 185 S 240 S 300 - 380
Refrigerant charge limit (lb) 18.8 22.0 24.0 27.5 29.8 35.0 44.0
The refrigerant charge limits given in
the table below will help to evaluate
the need for compressor protection
Note: for reversible heat pump sys-
tems and other specific applications,
please refer to section "Specific
Application Recommendations".
BELOW charge limit ABOVE charge limit
Cooling only systems,
Packaged units No test or additional safeties required Refrigerant migration & floodback test Crankcase heater
Cooling only systems
with remote condensor
and split system units
Refrigerant migration & floodback test
Crankcase heater, because full system
charge is not definable (risk of overcharging)
Refrigerant migration & floodback test
Crankcase heater
Liquid receiver
Reversible heat pump system
Specific tests for repetitive floodback
Crankcase heater
Discharge gas thermostat
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
Recommended Required
No test or additional safeties required
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
REC
REC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REQ
REC
RECREC
REC
The above chart represents basic
guidelines for reliable compressor
operations and safety. Please contact
Danfoss technical support for any
deviations from these guidelines.
Example 1 (R-22, SH = 20oF)
LP switch setting:
LP1 = 26 psig (1°F)
HP switch setting:
HP1 = 363 psig (144°F)
Risk of operation beyond the application
envelope.
DGT protection required.
Example 2 (R-22, SH = 20oF)
LP switch setting:
LP2 = 42 psig (19°F)
HP switch setting:
HP2 = 305 psig (131°F)
No risk of operation beyond the application
envelope.
No DGT protection required.

20
Motor protection
Compressor model Overheating
protection
Overcurrent
protection
Locked rotor
protection
Single-phasing
protection
SM / SZ 084 - 090 - 100 - 110 - 120 - 148 - 161 Internal Internal Internal Internal
SM / SZ 115 - 125 - 160 - 175 - 185 Internal Compulsory external overload protector
SY / SZ 240 - 300 - 380 Internal Internal Internal Internal
Compressor models SM / SZ 084
- 090 - 100 - 110 - 120 - 148 - 161
have internal motor protection to
protect against excessive current and
temperature caused by overloading,
low refrigerant flow, phase loss, or
incorrect motor rotation. The cutout
current is the MCC value listed in
the data sheets. The protector is
located in the star point of the motor
and, if activated will cut out all three
phases. It resets automatically. While
not compulsory, additional external
overload protection is advisable for
either alarm or manual reset.
Compressor models SM / SZ 115 -
125 - 160 - 175 - 185 have a bimetallic
single-pole, single-throw thermostat
located in the motor windings. This
thermostat will open In the event of
motor overheating caused by low
refrigerant flow or by incorrect motor
rotation. Because the thermostat is
an automatic reset device, it must be
wired in a lockout safety circuit with
a manual reset to restart the unit. For
overcurrent and phase loss protection,
an external overload protector must
be used for the SM / SZ 115, 125, 160,
175 and 185 models. The table below
shows the protection method for the
various compressor models.
Compressor models SY / SZ 240 -
300 - 380 are delivered with a factory-
installed motor protection module in
the terminal box. This device provides
efficient, reliable protection against
overheating, overloading, and phase
loss or reversal. Connected to the
module are PTC sensors embedded in
the motor winding. The close contact
between thermistors and windings
ensures a very low level of thermal
inertia. The motor temperature is
constantly measured by the (PTC)
thermistor loop connected on S1-S2
(refer to the electronic protection
module wiring on page 13).
If any thermistor exceeds its response
temperature, its resistance increases
above the trip level (4,500 Ω) and
the output relay opens the contacts
M1-M2. After cooling below the
response temperature (resistance
< 2,750 Ω), a 5 minute time delay is
activated. After this delay, the relay
closes the contacts M1-M2. The time
delay may be cancelled by interrupting
main power (L-N disconnect) for
approx. 5 seconds. The monitoring
fuction, however, is inactive for 20
seconds after shutdown.
SYSTEM DESIGN RECOMMENDATIONS
External motor protection All safety devices must comply with
the local safety requirements. The
external overload protector can be
either a thermal overload relay or a
circuit breaker. A thermal overload
relay should be set to trip at not more
than 140% of the compressor's rated
load current. A circuit breaker, on
the other hand, should be set at not
more than 125% of the compressor
rated load current. The rated load
current is the maximum current
expected during operation in the
application; it can be found either in
the corresponding data sheets or in
the of Danfoss RS+3TM Compressor and
Condensing Unit Selection Software,
available from the Danfoss web site.
The tripping current must never
exceed the MMT (Maximum Must-Trip)
Internal motor protection