Gree GMVVQ1015WM/C-X, Руководство по обслуживанию

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Gree GMV6 HR DC Inverter VRF Units Service Manual
308
4.2.4.1 Mechanical Inspection
Step 1: Switch off the power of the mode exchange box.
Step 2: Check whether the coil of the electronic expansion valve is firmly fixed on the
electronic expansion valve.
4.2.4.2 Electrical Inspection
Step 1: Power off the mode exchange box and power on it. When the mode exchange 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 mode exchange 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
specifi
cation
s
Max.
num
ber
of
steps
Terminal
layout
Diagram of internal coils
Coil
resistance
range
Electronic
expansion
balance
valve for
heating
CN37
CN38
CN39
CN40 Green
Blue
White
Red
5 cores 480
46Ω±3Ω
Electronic
expansion
valve of
subcooler
CN41 Black 5 cores 480
46Ω±3Ω