Gree GMVVQ1015WM/C-X, Руководство по обслуживанию

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Gree GMV6 HR DC Inverter VRF Units Service Manual
318
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.
Coil
Interface
No.
Color
Port
speci
ficati
ons
Max.
num
ber
of
steps
Terminal
layout
Diagram of internal coils
Coil
resistance
range
Heating
electronic
expansion valve
CN19
White
6
cores
2000
100Ω±10Ω