Air-to-water Heat Pump Split Versati
33
SPLIT TYPE
(2) GRS-CQ12Pd/NaE-M,GRS-CQ14Pd/NaE-M,GRS-CQ16Pd/NaE-M
XT4
25
26
Gate-Controller
15. Charging and Discharging of Refrigerant
(1)
Before shipped out from manufacturer, the outdoor unit has been filled with refrigerant. Additional refrigerant
may be filled when carrying out site connection of pipelines.
(2) Check the liquid valve and the gas valve of the outdoor unit. The valves shall be completely shut off.
(3) Connect a vacuum pump to the liquid valve and the gas valve of the outdoor unit to remove air from the
inside of the indoor unit and the connecting pipe. Refer to the following figure:
Pressure meter
“HI”knob
Vacuum pump
“Lo”knob
Liquid valve
Gas valve
Connection pipe
Pressure meter
(4)
After confirming that there is no leakage from the system, when the compressor is not in operation, charge
additional R410A working fluid with specified amount to the unit through the filling opening of the liquid pipe
valve of the outdoor unit.
•
Be sure to charge the specified amount of refrigerant in liquid state to the liquid pipe. Since this
refrigerant is a mixed refrigerant, adding it in gas form may cause the refrigerant composition to change,
preventing normal operation.
•
Before charging, check whether the refrigerant cylinder is equipped with a siphon tube or not.
With siphon tube
No siphon tube
WARNING
• When charging is interrupted or finished, reinspect the unit but do not let the compressor run into operation.
NOTE
•
Do not use mixture of refrigerant vapor and air or oxygen for pressurizing for fear of explosion.
