Gree GMV-VQ680WM/C-X Service Manual page 24

Gree
(5) After operating for 15~20min, if the water flow discharged by exhaust valve of hydro box outlet
pipe is stable and there is no airflow, it means exhausting is done. In this case, you can close
the manual exhaust valve and stop the operation of hydro box. Operation method: pressing
"Menu/OK" button to enter menu interface. Press "Left" or "Right" to find "Function" option, then
press "Menu/OK" button to enter "Function Setting". Select "Clean" and pressing "Menu/OK"
button to stop cleaning.
3.2.1.2.3 Air Exhausting of Water Tank and Pipeline at User Side
(1) Make sure each pipe port of water tank is connected and make sure the sewage port of water
tank is sealed;
(2) Open the water filling valve of water tank and open the valve at user side to fill water into water
tank until there is water flowed out from the valve at user side and there is no air bubble
continuously, which means water filling and air exhausting of water tank have been done. Then
you can close the valve at user side and enter operation debugging of the whole unit.
3.2.1.2.4 Second Time of Air Exhausting
After all connection wires of IDU, ODU and hydro box are connected and the debugging of
refrigerant system is done, please arrange air exhausting again. Detailed steps are as below:
(1) Open the hot water faucet to discharge water and open the water filling valve of water tank to fill
water into water tank until the water temperature reaches 20°C~30°C;
(2) Start hot water generation mode and open the manual exhaust valve at the same time;
After operating for 15~20min, if the difference between outlet water temperature and inlet water
temperature of hydro box is between 4~10°C, it means air exhausting is done. In this case, you can
close the manual exhaust valve and stop the operation of hydro box. Air exhausting operation of water
system is done.
(3) The steps mentioned above shall be done when water temperature in water tank is below 45°C.
When the temperature reaches 45°C, if the difference between inlet water temperature and
outlet water temperature of hydro box doesn't meet the requirement, please turn off the unit.
Open the faucet to discharge hot water and tap water will enter water tank from the water filling
valve of water tank, until water temperature in water tank reaches 20°C~30°C again. Then start
hot water generation mode again and open the manual exhaust valve at the same time to
exhaust air.
NOTE：If the hydro box is not used for a long time, the water inside water system should be drained
to prevent freezing the circulating water pipe.
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