Gree GMV6 DC Inverter VRF Units Service Manual
145
"J7" Four-way Va lve Air
Backflo w Protection
Replace th e 4-way valve
Yes
Whether th e voltage at the output of the
main boar d is normal? (If th e voltage at the output does n ot
meet re quiremen ts, the output voltage of the fo ur-way valve
is 220V when it is e nergized)
Whether th e four-way valve
coil is connected to the ma in
boa rd p roperl y?
Yes
Confirm that the four-way valve is abno rmal
No
Conne ct them prope rly and
relia bly
No
Replace th e main control
boa rd
Whet her t he difference between
the high pressure and the low pressure of t he
unit during operation is greater than 0.1 MPa? At the same
time t ouch the f our-way valve by hand to see whether it is hot or cold. In
cooling mode, E pipe and S pipe are of low t emperature and low pressure,
while D pipe and C pipe are of high temperature and high pressure; in
heat ing mode, D pipe and E pipe are of high temperature and
high pressure, while S pipe and C pipe are
of low temperat ure and low pressure.
Yes
Yes