Gree GMV-VQ680WM/C-X Service Manual page 320

Gree
4.3.3.1 Mechanical inspection
Step 1: Switch off the power of the hydro box.
Step 2: Check if the threaded connection between the electronic expansion valve coil and the
electronic expansion valve is normal.
4.3.3.2 Electrical inspection
Step 1: Power off the ODU and power on it. When the hydro box is powered on again, the
electronic expansion valve should be reset. When the electronic expansion valve is reset, touch
the valve with a hand to check if the valve core rotates. In the second half of the resetting process,
the valve core will click and vibrate obviously; otherwise, the electronic expansion valve, coil or the
main board needs to be replaced.
Step 2: Switch off the power of the hydro box, disconnect the coil terminal of the electronic
expansion valve from the main board and use a multimeter to measure the resistance of each
contact point of the terminal. The normal range of the resistance is shown in the following table. If
any value is beyond the normal range, the coil is damaged and needs to be replaced.
Interface
Coil
No.
Heating
electronic CN19
expansion valve
GMV6 HR DC Inverter VRF Units Service Manual
Max.
Port
num
speci
Color ber
ficati
of
ons
steps
6
White 2000
cores
318
Terminal
Diagram of internal coils
layout
Coil
resistance
range
100Ω±10Ω