AIR-TO-WATER HEAT PUMP INSTALLATION
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3. Filling of Refrigerant
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.
Check the liquid valve and the gas valve of the outdoor unit. The valves shall be
completely shut off.
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:
Fig.22
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.
¾ 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.
¾ Before charging，check whether the refrigerant cylinder is equipped with a siphon
tube or not；
1.5 Connection of Pipeline
(1) Connection of Outlet Pipe for Indoor & Outdoor Unit
Align the expansion end of copper pipe with the center of threaded joint. Tighten the
flaring nuts with your hands.
Tighten the flaring nuts with torque wrench until you hear a “click”.
With siphon tube
No siphon tube
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