SQA026KAZ – COMPRESSOR (22)

LG hermetic scroll compressor. In LG’s published compressor nomenclature the leading S code designates an R-22 low-side-shell scroll, which matches our recorded R-22 application. LG’s current catalog no longer lists this legacy R-22 model, so capacity, voltage and RLA are not stated here. Confirm against the compressor nameplate before installing.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• BrandLG
• TypeHermetic scroll, low side shell
• RefrigerantR-22 (LG nomenclature code S)
• Model capacity index026
• Published ratingsNot listed in the current LG scroll catalog
• Data SourceOTP stock record - not manufacturer-verified

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• ZR25K5-PFV
• HRM025T1LP6
• ZR25K5-PVF

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

How do I tell a burnout from a mechanical failure?

Ohm the terminals out of circuit. Common to start plus common to run should add up to run to start, and an OL reading on any pair means an open winding. Then check each terminal to the shell with the meter on a manual range, because any continuity to ground condemns it. Do not use a megger to condemn a modern scroll. If the oil smells acrid and an acid test comes back positive, you have a burnout rather than a stuck rotor.

What does a burnout require beyond the compressor?

A full cleanup, because acid and carbon are now in the lineset and the evaporator. Flush the system, install a new liquid line filter drier every time, and add a temporary 100 percent activated alumina suction line drier that comes back OUT after about 72 hours of run time. Replace the accumulator if the unit has one, since the oil return orifice plugs with debris. Copeland also calls for inspecting the contactor for pitted contacts and replacing the run capacitor on single phase units.

Why bother figuring out why the old one failed?

Because the compressor is usually the victim. Overheating from a dirty condenser or low charge, liquid floodback from a flooding metering device or a dead crankcase heater, lost lubrication from bad piping, and single phasing from a welded contactor or failed capacitor all kill compressors. Bolt a new one onto the same problem and you buy two.

Will a hard start kit save a weak compressor?

Only where the manufacturer calls for one. On a compressor failing for another reason it masks the symptom for a few weeks, and a potential relay left in circuit on the wrong application becomes its own failure.