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Compressor Burnout After R410A→R32 Retrofit

Likely causes

R32 operating high pressure is ~1.2–1.3× higher than R410A (discharge pressure up to 3.8 MPa)

Check: Inspect with instruments or visually

What to do: Replace with compressor redesigned and certified for R32 (verify MWP ≥ 4.2 MPa)

R32 discharge temperature is 15–25°C higher than R410A (can exceed 110°C)

Check: Inspect with instruments or visually

What to do: Replace refrigeration oil with R32-compatible POE oil (viscosity VG68 or higher recommended)

R32 charged into R410A-rated compressor

Check: exceeds design pressure limit

What to do: Recalculate refrigerant charge based on R32 spec — typically 70–75% of R410A charge by mass

R410A-grade POE oil left in place

Check: viscosity mismatch with R32

What to do: Monitor discharge temperature: stop operation immediately if >95°C during normal operation

Refrigerant charge quantity copied from R410A spec

Check: results in overcharge

What to do: Readjust HP safety valve and HP switch setpoints to R32 maximum operating pressure

Field tip

R32 (GWP 675) has different pressure-temperature characteristics than R410A (GWP 2088). Never charge R32 directly into existing R410A equipment — always replace with R32-certified components first.

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