Gree GMV-VQ680WM/C-X Service Manual page 401

Gree
(2) Operate from the direction shown in the figure below. Loosen the drain valve and the exhaust
valve installed on the outlet water pipe.
(1) Meanwhile, open the drain valve for engineering installation.
(3)
2.2 Anti-freezing measure
In countries where the inlet water temperature can be lower than 15℃, it's necessary to use
approved antifreeze in the circulating water to protect the water pipes. Please consult your hydro box
supplier for a locally approved solution. Calculate the approximate volume of circulating water in the
system. (The hydro box is not included.) Calculate the required amount of antifreeze according to the
volume ratio recommended in the following table and add it to the circulating water.
Type of antifreeze
Ethylene glycol
Propylene glycol
Methanol
Notes:
① Use only one of the above antifreeze.
② If antifreeze is used, pressure drop and capability degradation of the system can occur.
③ If antifreeze is used, corrosion may occur to the circulating water pipes, so be sure to use
corrosion inhibitors.
Minimum temperature for freeze protection
15℃~ -5℃ -10℃
12% 20%
17% 25%
6% 12%
399
GMV6 HR DC Inverter VRF Units Service Manual
-15℃
30%
33%
16%
-20℃ -25℃
- -
- -
24% 30%