HVACopediaAll brands · General troubleshooting
Low capacity
What is going on
Possible causes and checks for: low capacity.
Likely causes
- High condenser entering air temp, low chilled water set point (see A24 table), wrong solution charge/pressures
Check in this order
- Steel gauge manifold only
- Verify 200–300 psig high / 40–60 psig low
- Correct water/inhibitor/NH3 amounts. pp.931, 941 [905, 915]
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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.