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Measurable pressure drop across suction filter-drier; oil return problems, low suction, loss of capacity

What is going on

Possible causes and checks for: measurable pressure drop across suction filter-drier; oil return problems, low suction, loss of capacity.

Likely causes

  • Drier plugged with burnout debris, drier undersized

Check in this order

  1. Pressure at inlet/outlet access ports
  2. Replace core
  3. Size for suction velocity

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.