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25
Trial operation
• Before trial operation:
Before being powered on, measure the resistance between the power terminal block (live wire and neutral wire) and
the ground point with a multimeter. Check if it is over 1M Ω. If it is not, the unit will not operate.
To protect the compressor, power the outdoor unit for at least 12 hours before running the unit. If the crankcase
heater is not powered on for 6 hours, the compressor will not work.
Conrm the bottom of the compressor is getting hot.
Except for when there is only one master unit connected (no slave unit), for all other conditions, fully open the outdoor
service valves (gas side, liquid side). If the unit is operated without opening the valves, compressor failure will occur.
Conrm all indoor units are powered. If not, water leakage will occur.
Measure the system pressure while the unit is operating.
• Trial operation
During trial operation, refer to the information in the performance section. If the unit can not start up at the current
room temperature, enter trial operation at the outdoor unit.
Trial operation and the performance
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