Trial Run - Gree GMV-72WM/B-U Owner's Manual

5.2 Trial Run

During debugging, one and only one module must be set as a master module.
During debugging, one and only one IDU must be set as a master IDU.
When no special requirement is needed, no need to set other functions. Unit can operate
according to ex-factory settings. When special requirement is needed, please read the Service
Manual or Debugging and Maintenance Manual.
5.2.1 Preparation before trial run
(1) The power supply should be turned on only after finishing all the installation.
(2) All the control wires and cables are connected correctly and safely. Completely open the gas
and liquid valves.
(3) All the objects like metal filing, thrum and clip should be cleared after installation.
(4) Check if the unit appearance and piping system is damaged or not due to transportation.
(5) Check if the terminals of electrical element is loose and the phase sequence is correct or
not.
(6) Check the valve: for single-module unit, fully open the gas and liquid valve and close oil
balance valve; for dual/three module unit, fully open the gas, liquid valve and oil balance
valve.
5.2.2 Trial run
5.2.2.1 Notices
(1) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it's normally preheated. Start test
operation after unit is normally preheated, otherwise compressor might be damaged.
Debugging must be performed by professional technicians or under the guide of professional
technicians.
Fig.5.2.1
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GMV DC Inverter VRF