The AN66YQLMT is a three-phase scroll compressor from the SIAM Compressor Industry product family, used in R410A air-conditioning equipment. Its capacity class suits commercial cooling, packaged equipment and selected HVAC replacement projects. Published listings commonly identify 380–415 V operation, with some data sets also showing a 460 V, 60 Hz rating.
The model is frequently offered as a replacement component, but it should not be chosen from voltage and refrigerant alone. Cooling capacity changes with frequency and test conditions, while the suffix identifies a specific motor and application version. For a reliable match, compare the full model code and operating point with the original equipment documentation.
Published AN66YQLMT data
| Item | Published information |
|---|---|
| Model | AN66YQLMT |
| Product family | SIAM scroll compressor |
| Compressor type | Scroll |
| Refrigerant | R410A |
| Electrical supply | Three phase; 380–415 V at 50 Hz, with 460 V/60 Hz shown in some published data |
| Nominal published capacity point | Up to approximately 21.0 kW / 71,652 BTU/h, depending on rating conditions |
| Published input at that point | Approximately 6.52 kW |
| Published COP at that point | Approximately 3.22 W/W |
| Primary application | Commercial air conditioning |
These figures describe a published rating point, not guaranteed performance at every evaporating and condensing condition. Other tables show lower capacity at different conditions. System designers should request the applicable performance map rather than converting a single nominal figure directly into “tons” and assuming the selection is complete.
Where the AN66YQLMT fits
Scroll compressors are widely used in commercial air conditioning because they combine a compact refrigerant path with relatively smooth compression. The AN66YQLMT capacity class may be considered for packaged air conditioners, condensing units, process-air equipment and other R410A systems where the original manufacturer approves the model.
For replacement work, the safest use case is a like-for-like change where the failed compressor carries the same complete code. Cross-brand substitution requires a broader engineering check: capacity at the design point, mass flow, oil, discharge temperature, shell cooling, electrical current, protection, pipe connections and mounting geometry.
Fixed-speed or inverter?
Do not decide this from a generic marketplace description. Some sellers label almost every modern compressor as “inverter,” even when the listed electrical data indicates a conventional three-phase motor. The system wiring diagram and original controller provide the answer.
Before applying power, confirm whether the compressor is intended for direct-on-line, contactor-controlled operation or a matched variable-frequency drive. A wrong assumption can damage both the compressor and the control equipment.
Selection checklist for buyers
Refrigerant and oil
The AN66YQLMT is intended for R410A duty. Confirm the required oil type and factory charge from the exact technical document. POE oil used in R410A systems absorbs moisture quickly, so exposure during storage and installation should be kept to a minimum.
Design capacity
Ask for capacity at the project’s evaporating temperature, condensing temperature, superheat, subcooling and frequency. Nominal catalogue capacity is useful for identifying the general size, but not for final engineering selection.
Electrical details
Verify supply voltage, frequency, phase, rated current, locked-rotor or starting information, contactor rating and overload protection. Measure actual site voltage under load, not only the nominal panel label.
Mechanical compatibility
Compare shell dimensions, mounting points, suction and discharge connections, pipe orientation and available service clearance. A compressor that is thermodynamically suitable may still require pipework or base modifications.
System controls
Check pressure controls, discharge-temperature protection, crankcase heater, phase protection and any controller logic used by the original unit.
Installation and commissioning
The contractor should first establish why the original compressor failed. Common causes include condenser blockage, fan failure, low refrigerant charge, liquid floodback, loss of oil return, voltage imbalance and contactor damage. Replacing the compressor without correcting the root cause only resets the failure clock.
Keep the circuit clean and dry during installation. Replace the filter-drier, flow nitrogen while brazing, pressure-test correctly and use a calibrated micron gauge during evacuation. Charge R410A as specified by the equipment manufacturer.
During commissioning, check phase sequence where applicable and measure current on every phase. Record suction and discharge conditions, superheat, subcooling, discharge temperature and voltage imbalance. Compare these readings with the system documentation after the equipment has reached stable operation.
Information required for an accurate quotation
Send the following with your enquiry:
- complete AN66YQLMT nameplate photo;
- equipment manufacturer and unit model;
- R410A confirmation;
- site voltage and frequency;
- required cooling duty and operating temperatures;
- quantity, destination and preferred delivery method;
- terminal, pipe and mounting photos for replacement checks.
This is enough for a useful first review and helps avoid delays caused by incomplete model descriptions.
Request an AN66YQLMT quotation
Visit the AN66YQLMT product page or send the application details through the RT Compressor enquiry form. Current stock, technical documents and export delivery options are confirmed by quotation.
Frequently asked questions
Which refrigerant is used with the AN66YQLMT? Published product data identifies R410A.
Is it a three-phase compressor? Yes, published information lists a three-phase 380–415 V, 50 Hz version. Verify the nameplate because regional variants may differ.
What is its cooling capacity? A published nominal point shows approximately 21 kW, but capacity changes with test conditions and frequency. Use the performance table for the actual design point.
Can it replace another R410A scroll compressor of similar size? Only after checking performance, electrical design, oil, controls, pipe connections and mounting. Similar appearance is not proof of interchangeability.
Do you publish a fixed online price? RT Compressor uses B2B quotation pricing because quantity, destination, packaging and technical confirmation affect the final offer.
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