Preventive maintenance checklist for commercial refrigeration

Preventive maintenance is the best way to extend the life of refrigeration equipment and avoid costly breakdowns. Here's a complete checklist for every visit.

Condenser

• Clean the fins (vacuum or compressed air)
• Check fan operation
• Measure inlet and outlet air temperature
• Check fin spacing (no damage)
• Make sure airflow isn't obstructed

Evaporator

• Check defrost (any abnormal frost buildup?)
• Clean the fins if accessible
• Check the defrost drain (not clogged)
• Measure supply air temperature
• Check the fans (noise, vibration)

Compressor

• Measure amperage and compare to nameplate
• Check discharge line temperature (< 120°C)
• Listen for abnormal noises
• Check oil level (if sight glass present)
• Measure high and low side pressures
• Calculate superheat and subcooling

Refrigerant circuit

• Check for leaks with electronic detector
• Inspect lines (vibration, rubbing, insulation)
• Check the filter drier (delta T)
• Check the liquid sight glass (bubbles = low charge)
• Document pressures and temperatures

Electrical

• Check connections (tightness, corrosion)
• Measure supply voltage
• Check contactors and relays
• Test safety controls (high pressure, low pressure, anti-freeze)
• Check wiring (wear, overheating)

Documentation

• Fill out the work order with all measurements
• Document refrigerant added (halocarbons logbook)
• Photograph any anomalies found
• Schedule the next visit

Recommended frequency

System type	Frequency
Walk-in cooler (0 to 4°C)	Every 6 months
Walk-in freezer (-18°C)	Every 4 months
Commercial air conditioning	2x per year (spring + fall)
Industrial system	Every 3 months or per contract