Gree GMV-VQ680WM/C-X Service Manual page 252

Gree
4.1.4.1 Mechanical Inspection
Step 1: Confirm that the unit Power is disconnected.
Step 2: Find the 4-way valve coil, check whether the fixing screw is loose and whether the valve and
coil have any apparent exceptions.
Step 3: Energize and turn on the unit, check the temperature of pipelines of 4-way valve under
operating status:
There are labels in the 4-way valve, D refers to connecting exhaust side, S refers to connecting
inhalation side of gas-liquid separator. When the system is operating, check if the temperature of the
pipelines are the same with that of the following table. Note that do not directly touch the pipeline for
avoiding scald!
Operating
mode
Cooling
operation
Heating
operation
4.1.4.2 Electrical Inspection
Compare the measured coil resistance with the normal coil resistance to check whether the coil is
damaged.
（1） Power off the unit. Remove the electrical appliance cover after the ODU stops.
Warning: Electric shock
（2） Remove the electrical appliance cover and check whether the connecting terminal of the
4-way valve is firm.
（3） Disconnect the corresponding valve's coil terminal from the main board and use a multimeter
to measure the coil resistance.
4-way valve
S pipe
Cooling Low
4-way valve temperature
Heating Low
4-way valve temperature
Cooling Low
4-way valve temperature
Heating Low
4-way valve temperature
GMV6 HR DC Inverter VRF Units Service Manual
D - Connecting to
the exhaust side.
Warning: high
temperature!
Pipeline status
E pipe C pipe
Low
temperature temperature
High
temperature temperature
High
temperature temperature
High
temperature temperature
250
D pipe
High High
temperature
Low High
temperature
Low High
temperature
Low High
temperature