Chiller monthly inspection checklist

Controller — No active alarm; alarm history reviewed since the last round

Chilled water — Leaving chilled water temperature at its set point

Compressors — Record compressor run hours and number of starts in the log

Refrigerant pressures — Suction and discharge pressures within the manufacturer’s range

Sight glass — Liquid line sight glass

• Clear, full of liquid (Conforming)
• Continuous bubbles (Non-conforming)
• Moisture indicator shows wet (Non-conforming)
• No sight glass on this unit

Refrigerant circuit — Any sign of refrigerant leak (oil stains at joints, hissing, leak detector alarm)?

Compressor oil — Oil level in the compressor sight glass

• Within the marks (Conforming)
• Below the minimum (Non-conforming)
• Above the maximum or foaming (Non-conforming)
• No sight glass (hermetic compressor)

Compressors — Compressors run without abnormal noise or vibration

Flow — Chilled water pump running and flow switch proving flow

Strainers — Strainer pressure drop normal (strainers not clogged)

Pipework — No water leak at pipework, valves or pump seals; insulation intact

Condenser — Condenser clean: coil fins unobstructed (air-cooled) or approach temperature normal (water-cooled)

Electrical panel — Panel doors closed, no burning smell, no tripped protection

Relief valves — Pressure relief valves not leaking, not tampered with, vent lines clear

Plant room — Refrigerant detector in service and plant room ventilation working

Remarks — Observations for the next service