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Table 20
– Inverter sizes
VFD sizes
Type
90 kW
Capless
120 kW
Capless
200 kW
Capless
330 kW
Standard
400 kW
Standard
Low Ambient Start-up
Inverters include a temperature control which allows them to withstand ambient temperatures down to -20°C. However
they should not be switched on at temperatures lower than 0°C unless the following procedure is executed:
•
Open the switchbox (only trained technicians should perform this operation)
•
Open compressor fuses (by pulling the fuse holders) or compressor circuit breakers
•
Power on the chiller
•
Keep the chiller powered on for 1 hour at least (this allows inverter heaters to warm-up the inverter).
•
Close fuse holders
•
Close the switchbox