Pre-start Checklist
Unit Installation and Connections
Check that equipment is fully installed in accordance with the installation instructions
Visually check that air flows will not be obstructed
Electrical
Visually check all field wiring
Tighten all electrical connections including all factory wiring connections
Ensure supply cable is the correct size
Check that required supply voltage is available on all phases
Check overload settings are correct (if applicable)
Filters
Check that the fresh air inlet has adequate filters before starting unit
Refrigeration
Ensure all access caps are tight
Check pipework is not rubbing against other pipes due to movement during transport
Leak test all caps and pressure connections after commissioning
Starting Unit
Check fans and Air Flow
Turn on all circuit breakers
Turn on control circuit and activate fans
Turn on supply fan, run and conduct an air balance (fans do not require phase rotation)
Check fan current draw for each fan individually
Check Compressor and Refrigeration System Operation
Crankcase heaters must be activated for 24 hours before operation (if fitted)
WARNING
- Check correct rotation for compressors
Turn on Compressor 1, run for 5 minutes
Turn on Compressor 2 (if applicable)
Record amp readings for each compressor
Superheat should be between 8-11°C on Cooling (R407C)
If superheat is high, add refrigerant slowly using liquid into the suction line.
Do not flood liquid into the suction line.
HTC – Humidity and Temperature Control Unit Installation and Operation Manual 2021 13
