Gree Ultra Heat GMV-V72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual MAINTENANCE
130
2.1.2 Precondition: units cannot be normally started
Step 1: Disconnect the power supply of the units and open the electric junction box of the
compressor to see whether wiring of the compressor is intact.
Step 2: Measure the resistance between two wiring terminals (U, V, W). The resistance value
range should be 0.5~2.0 Ω.
Measure the resistance to earth of each wiring te
rminal. The value should be 10 MΩ. If not, the
compressor has an internal fault.
Step 3: Check the solenoid valves of the system, include electric expansion valves, oil return
valves, and oil balance valves. Refer to the preceding section for the test method.
Step 4: Check the IPM module. Refer to the preceding section for the test method
2.2 Compressor Replacement
Step 1: Disconnect power supply.
Turn off the power switch of the ODUs and disconnect the line of the power supply and the power
line of the ODUs. Meanwhile, cover the power line with tape for insulation and put a warning sign
beside the power switch to prevent electric shock.
Step 2: Clear electric parts (do not need to disassemble the electric box).
Before removing compressors’ lines, temperature sensors, and electric heaters, mark them so that
you will reconnect them in a correct manner after clearing. The removed electric box must be covered
and protected from wind and sun.
1
、
Unscrew the electric
box.
2
、
Make sure to support
the electric box.
3
、
Take the electric box
out.
4
、
The method of
removing the box at the
left side is similar.