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

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
90
LED1 LED2 LED3
Function
Code
Display
Mode
ODU Function Mode
Code
Display
Mode
ODU Function Mode
Code
Display
Mode
A6
On nC On nC On
A6
On nH On nH On
A6
On nA On nA On
A6
On nF On nF On
On the master unit, press "SW6" to return to the upper level (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).
If no button operations are performed on the master unit for five minutes, the function setting
automatically quits and the unit restores the current status.
The default factory setting is
―nA‖ cooling/heating.

A2 Refrigerant recovery operation settings
Step 1: Confirm entering the A2 refrigerant recovery operation settings. The master unit is displayed as
follows:
LED1 LED2 LED3
Function
Code
Display
Mode
Refrigerant
Recovery
Code
Display
Mode
Current
Status
Display
Mode
A2 On 01 Blinking 00 Blinking
Step 2: The default setting is ―01‖. Select "01" or "02" by pressing "SW1 (UP)
" or "SW2 (DOWN)". Press
"SW7" to confirm selecting the mode.
On the master unit, press "SW6" to return to the upper level.
If no button operations are performed on the master unit for five minutes, the function setting
automatically quits and the unit restores the current status.

Indoor unit refrigerant recovery
Step 3: Select "01‖ as in step 2 to enter
IDU refrigerant recovery. Digital LEDs and status LEDs of all
basic modules are displayed as follows:
LED1 LED2 LED3
Function
Code
Display
Mode
Refrigerant
Recovery Code
Display
Mode Current Status
Display
Mode
A2 On 01 On [Module low-pressure Ps] On
LED3 shows the low-pressure value of a module. If the value is negative, LED3 circularly displays the
negative code "nE‖ and the numeric value every one s
econd. For example, for -30

C, LED3 alternately
displays ―nE‖ for one second and then ―30‖ for another second.
Step 4: Close liquid-tube stop valves of all basic modules of the ODU. When the low-pressure value
displayed on LED3 continually blinks, quickly close air-tube stop valves of all basic modules 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 low-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:
Another startup is not allowed within 10 minutes after refrigerant recovery.

Basic module refrigerant recovery
Step 3: Set the basic module requiring refrigerant recovery to module emergency operation status and
close the liquid-
tube stop valve of the emergency status module. Select "02‖ as in step 2 to enter basic
module refrigerant recovery. The display is as follows:
LED1 LED2 LED3
Function
Code
Display
Mode
Current
Progress
Display
Mode
Current
Status
Display
Mode
A2 On 02 On
Module
high-pressure On
LED3 shows the high-pressure value of the module.