General System Overview
- Visual inspection for leaks, corrosion, or physical damage
- Check operating hours and compressor starts counter
- Review alarm history and fault codes
- Verify control panel displays and indicator lights
- Check insulation integrity on pipes and components
- Inspect support structures and vibration isolators
Compressor and Refrigerant System
- Check compressor performance and listen for abnormal sounds
- Verify refrigerant pressure levels (suction and discharge)
- Perform refrigerant leak detection test
- Check oil level and condition
- Test oil heater functionality
- Verify superheat and subcooling values
- Check purge unit operation (if equipped)
Electrical System
- Verify voltage, amperage, and phase balance
- Inspect electrical connections for tightness and corrosion
- Check control panel components and wiring
- Test circuit breakers and safety switches
- Inspect motor insulation resistance
- Verify VFD operation and parameters (if equipped)
- Check ground fault protection devices
Water and Cooling System
- Check chilled water flow rate and pressure drop
- Verify chilled water supply and return temperatures
- Inspect condenser water flow and temperatures
- Check water treatment system operation
- Verify pump operation and vibration levels
- Inspect strainers and clean if necessary
- Check isolation and control valve operation
Heat Exchangers
- Inspect evaporator for fouling or scaling
- Check condenser tube cleanliness
- Verify approach temperatures
- Check tube sheet and end bell condition
- Inspect water boxes for corrosion
- Verify refrigerant level in sight glass
Safety and Protection Systems
- Test high/low pressure safety switches
- Verify temperature sensors and calibration
- Test emergency shutdown system
- Check flow switches and interlocks
- Verify relief valve settings and condition
- Test refrigerant monitor/leak detection system
- Check machine room ventilation system
Performance Monitoring
- Record and analyze system efficiency (kW/ton)
- Review energy consumption trends
- Check capacity control operation
- Verify setpoints and control sequences
- Monitor compressor surge conditions
- Check BAS integration and communication
Control System
- Verify microprocessor control operation
- Check all sensor readings for accuracy
- Test control valve actuators and positioning
- Verify lead/lag operation (if applicable)
- Check remote monitoring capabilities
- Update control software if required
Documentation and Compliance
- Update maintenance log with all findings
- Record refrigerant additions or removals
- Verify compliance with EPA regulations
- Update equipment runtime logs
- Document any repairs or adjustments made
- Schedule follow-up maintenance as needed