Danfoss SM147A3ALB Scroll Compressor

By Qishanr Compressors July 30th, 2026 2 views

I. Product Positioning

The Danfoss SM147A3ALB scroll compressor belongs to the Performer® SM series, a classic model within the brand's fixed-speed scroll compressor product line for commercial air conditioning applications.
It offers a nominal cooling capacity of approximately 12HP.
Primary application scenarios include small to medium-sized commercial air conditioning systems such as chillers, rooftop units, unitary air conditioners, and precision cooling units for data centers.

Refrigerant: Specifically optimized for R22.
Power Supply: 200-230V / 3-phase / 60Hz.
Displacement: 193.5 cm³.
Cooling Capacity (ARI standard conditions: 7.2°C evaporating / 54.4°C condensing): Approximately 122,900 BTU/h (36 kW).
COP: 3.57 W/W.
Rated Load Amperage (RLA): 40.7A.
Maximum Continuous Current (MCC): 57A.
Locked Rotor Amperage (LRA): 304A.
Maximum Working Pressure (PS) - High Side: 27.8 bar.
Maximum Working Pressure (PS) - Low Side: 25.0 bar.
Test Pressure: 32 bar.
Allowable Suction Superheat Range: -35°C to 63°C.

The scroll design requires significantly fewer moving parts compared to reciprocating compressors—only two scroll sets (orbiting and fixed) complete the suction, compression, and discharge cycle.
This results in lower vibration and noise levels, making it suitable for noise-sensitive commercial environments.
Volumetric efficiency is enhanced due to reduced internal leakage.
Fewer wearing components contribute to extended maintenance intervals and improved long-term reliability.

The compressor is factory-precharged with 3.3 liters of mineral oil (160P), specifically formulated for R22 refrigerant systems.
A threaded sight glass is integrated into the housing, allowing technicians to easily monitor oil level and refrigerant liquid level during installation and routine service, simplifying maintenance procedures.

Connection Type: ODF brazed connections, ensuring leak-tight sealing and resistance to vibration-induced loosening over the system lifetime.
Ingress Protection Rating: IP54 (when equipped with a cable gland), providing effective defense against dust ingress and water splashes for reliable operation in demanding installation environments.

The industry is shifting toward low-GWP refrigerants and variable-speed drive technology in response to tightening environmental regulations.
Danfoss has responded with next-generation platforms including:
- DCF/PSF series R32 scroll compressors featuring Intermediate Discharge Valve (IDV) technology.
- VZH series variable-speed scroll compressors, which deliver significantly higher partial-load efficiency and superior low-temperature heating performance compared to traditional fixed-speed models.
However, the SM147A3ALB remains a mature, field-proven product with:
- High technical certainty.
- Stable availability of spare parts.
- Extensive service expertise accumulated over years of market presence.
These attributes make it particularly valuable in legacy system replacement projects and fixed-speed applications where proven reliability outweighs the benefits of newer technologies.

The Danfoss SM147A3ALB scroll compressor has established its position as a benchmark in the commercial air conditioning fixed-speed segment, backed by its 193.5 cm³ displacement, 12HP nominal capacity, and system-level optimization for R22 refrigerant.
For engineers and service technicians, a thorough understanding of its electrical limits (especially LRA and MCC), pressure boundaries, and refrigerant compatibility is essential to ensure safe and efficient system design and operation.
Despite the broader industry transition toward low-GWP refrigerants and variable-speed solutions, the SM147A3ALB continues to see adoption in replacement markets and niche projects, sustained by its proven reliability and mature service ecosystem.