Trane Thermafit™ – Daily Screw Vapor Chiller Maintenance Procedure
Perform daily checks on Trane Thermafit™ screw vapor chillers to ensure system reliability, energy efficiency, and proper safety compliance.
General System Overview
- Visual inspection of Thermafit chiller unit for leaks, damage, or abnormal conditions.
- Record operating hours and compressor starts from Tracer display.
- Verify all safety alarms and indicators are functional.
- Check proper Trane labeling and hazard warning signs visibility.
- Inspect for corrosion, loose fasteners, or damaged insulation.
Control System & Display
- Trane Tracer controller display clear and functional.
- No active alarms or fault codes present.
- Control panel touchscreen/buttons responsive.
- Operating setpoints within design parameters.
- Trend data logging functioning properly.
- BAS communication status verified (if applicable).
Screw Compressor System
- Twin-screw compressor operation smooth without unusual vibrations.
- Oil level within sight glass acceptable range.
- Oil temperature and pressure within specifications.
- Oil separator functioning correctly.
- Slide valve/capacity control operating smoothly.
- Compressor discharge temperature within limits.
Refrigerant System
- Refrigerant charge adequate per sight glass indication.
- No refrigerant leaks detected (visual/electronic check).
- Suction and discharge pressures within range.
- Superheat and subcooling values optimal.
- Filter drier pressure drop acceptable.
- Thermostatic expansion valve operating properly.
Electrical Components
- Voltage and current readings within Trane specifications.
- Proper grounding verified and connections secure.
- Motor terminals free from corrosion and tight.
- Compressor motor amperage within FLA rating.
- Variable frequency drive (VFD) operating correctly if equipped.
- Control transformer voltage output correct.
Water Systems
- Chilled water flow rate within design parameters.
- Condenser water flow adequate with no restrictions.
- Entering and leaving water temperatures appropriate.
- Water pressure drop across heat exchangers acceptable.
- Flow switches and sensors functioning properly.
- Water treatment system operating (verify chemical levels).
Heat Exchangers
- Evaporator approach temperature within specifications.
- Condenser approach temperature acceptable.
- No signs of fouling or scaling on tube surfaces.
- Refrigerant level in evaporator appropriate.
- No visible refrigerant or water leaks at connections.
Safety & Protection Systems
- High/low pressure cutouts tested and operational.
- Oil pressure safety switch functioning correctly.
- Emergency stop button accessible and functional.
- Freeze protection controls verified operational.
- Relief valves properly seated with current test dates.
- Lockout/tagout procedures posted and accessible.
Performance Monitoring
- System efficiency (kW/ton) within expected range.
- Cooling capacity meeting building load requirements.
- Energy consumption trends reviewed and normal.
- Compressor loading/unloading patterns appropriate.
- Oil return cycle frequency within normal range.
- Maintenance schedule reviewed and updated.
Documentation & Reporting
- Daily inspection log completed with all parameters recorded.
- Maintenance activities documented per Trane requirements.
- Environmental compliance verified (refrigerant handling).
- Safety inspection records current and complete.
- Energy performance data captured for analysis.
- Service history and warranty status reviewed.