Contactor,circuit breaker,sensor,Encoder,PLC,Converter
(Performer hermetic scroll compressor)
Order No.: 120H0191, a fixed-speed scroll unit from the Danfoss SM series, designed for R22 central air conditioning applications.
✅ Model Decoding
SM: Performer scroll series, air-conditioning duty
147: Displacement size 193.5 cm³/rev
A: Motor version
4: 3-phase 380~415V 50Hz / 460V 60Hz
ALB: Oil sight glass, internal motor protection, ODF brazed connections, no economizer
📌 Core Technical Specifications
| Item | Parameter |
| Refrigerant | R22 (compatible only with R22 mineral oil 160P) |
| Power Supply | 3Ph 380–415V 50Hz / 460V 60Hz |
| Cooling Capacity | 32.6kW@50Hz；43.6kW@60Hz |
| Displacement | 193.5 cm³/r |
| Rotation Speed | 2900rpm(50Hz) / 3500rpm(60Hz) |
| RLA Rated Load Current | 20.7A |
| LRA Locked Rotor Current | 147A |
| MOC Maximum Operating Current | 26A |
| Net Weight | 67 kg, Gross Weight 71.75 kg |
| Pipe Connections | ODF brazed, discharge 7/8″ |
| Outline | Outer diameter φ243mm, height 509mm |
| Certifications | CE / UL / UKCA |
| Capacity Control | Fixed speed, no variable frequency |
| Economizer | ❌ No subcooler/economizer port |
| Max Refrigerant Charge | 7.9kg |
🧊 Typical Applications
Commercial air-cooled / water-cooled central air conditioning units
Modular chillers, screw compressor retrofit, industrial water chillers
Commercial constant temperature & humidity air conditioners (R22 system only; cannot directly replace R407C/R410A models)
⚠️ Maintenance & Selection Notes
- Refrigeration Oil: 160P mineral oil. POE synthetic oil must not be mixed. Compressor replacement requires simultaneous oil & oil filter change.
- Built-in motor thermal protection. External phase sequence protector and high/low pressure protection are recommended.
- Single unit operation; multi-compressor parallel installation requires oil equalization solution (oil balance port size 1-3/4″ Rotolock).
- Maximum allowable operating pressure: High side 29.4bar, low side 25bar.
- Second-hand inspection focus: Insulation resistance, inter-turn test, oil colour, internal abnormal noise, high/low pressure leak test.
🔁 Equivalent / Alternative References
SM147A3ALB: Different voltage version (code 3)
SM147A4CLB: Difference in connection and accessory configuration
SZ147A4ALB: Same displacement, for R407C (not directly interchangeable; refrigerant and lubricant differ)
SM147A4ALB Starting & Protection Circuit Selection List (3Ph 380~415V/50Hz, R22 Performer Scroll)
Compressor base electrical data: RLA=20.7A; MOC maximum continuous operating current=26A; LRA locked rotor current=147A; The compressor has built-in motor thermal protection. Complete external electrical and refrigerant pressure protection is still mandatory.
- Main Circuit Component Selection
| Component | Specification | Remarks |
| 3-phase Main Contactor | AC-3 400V ≥32A, coil AC220V/AC380V optional | Schneider LC1D32, LC1E32; AC-3 rated to withstand LRA inrush. AC-1 contactors are prohibited. |
| MCCB Molded Case Circuit Breaker | Type D 3P, rated 40A, instantaneous trip 10In | Type D for motor starting inrush, short-circuit protection. Type C not permitted. |
| Thermal Overload Relay | Adjustment range:18~24A, 3P, manual reset | Setpoint approx. 21A; acts as secondary backup overload protection and cannot replace the compressor internal thermal protector. |
| Main Power Cable | Copper ≥4mm² power cable | Single unit, length ≤30m; upgrade to 6mm² for long runs, use crimp lugs |
| Crankcase Heater | 220V, 80W, AC220V | Oil sump heating; minimum 8 hours preheating before startup. Heater circuit independent and cut off before compressor starts. |
- Refrigerant Pressure Protection (safety chain wired in series with contactor coil circuit)
| Device | Recommended Model | Setting | Reset Mode |
| High Pressure Switch | Danfoss KP5 (high pressure) | Trip:27bar; Reset:21bar | Manual reset (mandatory), R22 service |
| Low Pressure Switch | Danfoss KP1 (low pressure) | Trip:1.8bar; Reset:3.2bar | Auto reset, guards against low suction liquid floodback / low refrigerant charge |
| Oil Differential Pressure Protection (optional) | Danfoss MP54 | Trip if oil differential pressure <2.5bar with 120s delay | Strongly recommended for large chillers |
III. Phase Sequence & Phase Loss Protection (mandatory)
Phase sequence / phase loss relay: 3-phase 380V, detects wrong phase, phase loss & 3-phase unbalance
Recommendation: Schneider RM22TG20 or domestic 3-phase protection relay
Logic: Cut contactor coil upon abnormal phase condition. Scroll compressor reverse rotation can destroy scroll wraps within seconds.
- Control Circuit (AC220V control)
- Control supply: AC220V with C10 miniature circuit breaker (10A)
- Series safety chain for coil circuit: Phase sequence protection NC → High pressure switch NC → Low pressure switch NC → Oil differential (optional NC) → Start/Stop Button → Contactor Coil
- Auxiliary contacts: Contactor NO auxiliary contact for latching; fault alarm wired from NO contacts of each protection device.
- Hard Rules for Scroll Compressor Startup Control
- Minimum off-delay: Wait at least 3 minutes after shutdown before restart; controller 180s minimum stop delay is recommended.
- Maximum starts per hour: ≤6 times. Frequent starts accelerate bearing and scroll wrap wear.
- Forbidden operations: Start with pressure differential, test rotation in reverse, start without crankcase preheating.
- After internal protector trips: Power must be cut for cooling and reset. Do not repeatedly force power on for trial runs.
- Optional Sensors & Accessories
Discharge temperature sensor (optional): PT100, discharge overtemperature protection for high-temperature R22 operation
Current transformer (optional): 25/5A, for real-time current monitoring by unit controller
Terminals: Crimp lugs recommended for compressor terminals, tightening torque 3.5~4N·m per Danfoss manual
VII. Simplified Typical Control Sequence
Power on → Phase sequence self-check OK → Crankcase heater energized → Preheating timer satisfied → Start enable signal → Contactor pulls in, compressor runs.
Trip on high pressure (manual reset), low pressure, phase loss / wrong phase: contactor de-energized immediately, unit stops and triggers fault alarm.
VIII. Selection Pitfall Checklist
- Thermal relay is only backup protection. The compressor built-in thermal protector will activate first. Do not use thermal relay as sole motor protection.
- High pressure protection must use manual reset. Auto-reset high pressure switches violate safety requirements.
- Phase sequence protection must never be omitted; reverse rotation can ruin scroll plates in tens of seconds.
- Crankcase heater cannot be omitted. For R22 mineral oil, refrigerant dissolves in oil at low standby temperature; startup without preheating risks bearing seizure from oil starvation.
Danfoss Performer SM Series (R22 fixed-speed scroll, single unit) Full Model List
SM series: R22 refrigerant, mineral oil 160P, air-conditioning scroll compressors; SZ series of same footprint for R407C; SY series covers larger displacement range.
Naming rule: SM+displacement code+motor code+voltage code+suffix (connections/accessories); Code 4 = 380~415V 50Hz /460V 60Hz (main domestic engineering variant; SM147A4ALB uses code 4)
- Base Displacement Core Models (bare unit without ALB/CLB suffix)
| Base Model | Displacement cm³/rev | Cooling Capacity kW@50Hz | Remarks |
| SM084 | 112.08 | 16.1 | Small modular units, fan coil units |
| SM090 | 120.5 | 17.3 | Air-cooled modular, large residential central AC |
| SM100 | 127.2 | 18.5 | Commercial air conditioning |
| SM110 | 144.2 | 20.8 | Water chillers |
| SM112 | 151.5 | 22.1 | Short body version |
| SM115 | 156.8 | 23 | |
| SM120 | 166.6 | 24.6 | Mainstream modular chiller model |
| SM124 | 169.5 | 25.4 | Short body |
| SM147 | 193.5 | 32.6 | Bare model of your SM147A4ALB |
| SM148 | 194.5 | 33 | SM147 upgraded variant |
| SM160 | 210.1 | 35.4 | Medium water chillers |
| SM161 | 216.6 | 36.6 | |
| SM170 | 229 | 38.8 | |
| SM175 | 233 | 40.2 | |
| SM180 | 241 | 41.8 | |
| SM185 | 249.9 | 43.7 | Largest single unit in SM range |
| SM200 | 254.4 | 46.1 | Older large SM, mostly superseded by SY series for new projects |
| SM220 | 288.4 | 52.7 | Older large SM |
| SM242 | 333.2 | 61.3 | Older large SM |
| SM248 | 342 | 64 | Older large SM |
| SM444 | 597 | 117 | Built-in tandem parallel compressor |
| SM483 | 649.8 | 127 | Built-in tandem parallel compressor |
- SM147 Full Suffix Variants (subfamily of your compressor)
SM147 bare unit, voltage codes: 3 /4 /9
SM147A3ALB: Voltage code 3 variant
SM147A4ALB: Your model, 380~415V 50Hz, ODF brazed ports, oil sight glass, no economizer, Order No.120H0191
SM147A4CLB: Different connection style, Rotolock port
SM147A9ALB: 60Hz North American voltage version
Suffix explanation:
ALB = ODF brazed pipe connections, oil sight glass, internal thermal protection, no economizer
CLB = Rotolock flange connections, oil sight glass, internal thermal protection
III. Voltage Code Definition (middle digit of model)
3: 200–230V 3-phase 60Hz
4: 380–415V 50Hz /460V 60Hz (main domestic engineering model)
9: 380V 3-phase 60Hz (North American unit)
- Platform Differentiation (avoid selection error)
- SM: R22, mineral oil 160P (this list)
- SZ: Same outer dimensions, R407C, POE synthetic oil, cannot directly replace SM
- SY: Larger displacement range, R22, high-capacity water chillers (SY240, SY300, SY380, SY550 etc., not part of SM series)
- End-of-Life Notice
SM200/SM220/SM242/SM248 are legacy large SM models, mostly discontinued. New projects are recommended to adopt SY series. SM084~SM185 remain mainstream stocked models.
Danfoss Performer SM Series (R22) Current Parameter Table
Note: Power supply 3Ph 380~415V 50Hz; RLA=Rated Load Current; MOC=Maximum Continuous Operating Current; LRA=Locked Rotor Current; all single units, tandem compressors listed separately.
| Model | Displacement cm³/rev | Cooling Capacity kW@50Hz | RLA(A) | MOC(A) | LRA(A) |
| SM084 | 112.08 | 16.1 | 11.2 | 14.1 | 84 |
| SM090 | 120.5 | 17.3 | 12.1 | 15.2 | 90 |
| SM100 | 127.2 | 18.5 | 12.8 | 16 | 94 |
| SM110 | 144.2 | 20.8 | 14.4 | 18 | 106 |
| SM112 | 151.5 | 22.1 | 14.8 | 18.5 | 108 |
| SM115 | 156.8 | 23 | 15.4 | 19.3 | 112 |
| SM120 | 166.6 | 24.6 | 16.2 | 20.3 | 118 |
| SM124 | 169.5 | 25.4 | 16.6 | 20.8 | 122 |
| SM147 | 193.5 | 32.6 | 20.7 | 26 | 147 |
| SM148 | 194.5 | 33 | 21 | 26.3 | 149 |
| SM160 | 210.1 | 35.4 | 22.5 | 28.1 | 160 |
| SM161 | 216.6 | 36.6 | 23.2 | 29 | 163 |
| SM170 | 229 | 38.8 | 24.3 | 30.4 | 171 |
| SM175 | 233 | 40.2 | 25.1 | 31.4 | 176 |
| SM180 | 241 | 41.8 | 26 | 32.5 | 182 |
| SM185 | 249.9 | 43.7 | 27 | 33.8 | 188 |
| SM200 | 254.4 | 46.1 | 28.4 | 35.5 | 196 |
| SM220 | 288.4 | 52.7 | 32.2 | 40.3 | 222 |
| SM242 | 333.2 | 61.3 | 36.8 | 46 | 254 |
| SM248 | 342 | 64 | 38.2 | 47.7 | 262 |
Tandem Integrated Compressors (dual scroll block)
| Model | Displacement Cm³/rev | Cooling Capacity kW@50Hz | RLA(A) | MOC(A) | LRA(A) |
| SM444 | 597 | 117 | 64.5 | 80.6 | 440 |
| SM483 | 649.8 | 127 | 70.2 | 87.8 | 478 |
Supplementary Notes
- This table applies to suffix code 4 versions (A4ALB/A4CLB). Code3/9 variants (220V 3-phase, 60Hz North America) have different current values and must not use this table.
- Thermal overload relay setting recommendation: RLA × 1.02 ~ 1.05, used as backup protection and shall not exceed MOC.
- LRA locked rotor current is used for contactor and circuit breaker short-time inrush sizing only, not continuous current rating.
- SM series only works with R22 + 160P mineral refrigeration oil; SZ series (R407C) of identical external shape has different current parameters and shall not be mixed.
