Gree GMV-224WM/B-X, Service Manual

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
91
Step 4: When the high-pressure value displayed on LED3 continually blinks (displayed as 0

C if the high
pressure is less than 0

C), quickly close the air-tube stop valve of the emergency module and then press
"SW7" on the master unit to confirm completing refrigerant recovery or power off the entire unit.
If no operations are performed after the high-pressure value displayed on LED3 continually blinks for
three minutes, the entire unit will be forcibly stopped.
On the master unit, press "SW6" to return to the upper level for restoring the standby status of the entire
unit (press "SW6" in setting status to return to the upper level; press "SW6" after settings are completed
to restore the normal operating status of the unit).
Note:
Before the basic module refrigerant recovery operation, users must close the liquid-tube stop
valve of the basic module requiring refrigerant recovery.
Another startup is not allowed within 10 minutes after refrigerant recovery.

A8 Aftersales vacuuming mode settings
Step 1: Confirm entering the A8 aftersales vacuuming mode settings. The master unit is displayed as
follows:
LED1 LED2 LED3
Function
Code
Display
Mode
Current
Progress
Display
Mode
Current
Status
Display
Mode
A8 On 00 Blinking OC Blinking
Enter the to-be-confirmed status of system vacuuming mode settings.
Step 2: Press "SW7" to confirm entering the to-be-confirmed status of system vacuuming mode settings.
All modules are displayed as follows:
LED1 LED2 LED3
Function
Code
Display
Mode
Current
Progress
Display
Mode
Current
Status
Display
Mode
A8 On 00 On OC On
Expansion valves and electromagnetic valves of all outdoor and IDUs are opened, and the entire unit
cannot be enabled.
Press "SW6" on the master unit to quit the vacuuming status. Alternatively, the entire unit quits the
vacuuming status after 24 hours.

n0 System conservation operation settings
Step 1: Confirm entering the n0 system conservation operation settings. The master unit is displayed as
follows:
LED1 LED2 LED3
Function Code Display Mode Code Display Mode Current Status Display Mode
n0 On 01 Blinking OC Blinking
Step 2: Select a corresponding mode by pressing "SW1 (UP)" or "SW2 (DOWN)".
LED1 LED2 LED3
Function Code Display Mode Code Display Mode Current Status Display Mode
n0 On 01 Blinking OC Blinking
n0 On 02 Blinking OC Blinking
Step 3: Press "SW7" to confirm selecting the mode. The master unit is displayed as follows:
LED1 LED2 LED3
Function Code Display Mode Code Display Mode Current Status Display Mode
n0 On 01 On OC On
n0 On 02 On OC On
If no button operations are performed for five minutes, the function setting automatically quits and the
unit restores the current status. (Press "SW6" in setting status to return to the upper level; press "SW6"