Air Purging And Refrigerant Charge - COMFORT-AIRE A-VFH30QB-1 Installation & Operation Manual

Installation & Operation Manual - VFH-B 30/36/42 Series
Inverterflex Series
After the pipe is insulated, never bend it to form a small angle; otherwise it will crack or break.
(3)Wrap the Pipe with Tape：
a. Bundle the refrigerant pipe and electric wire together with tape, and separate them from the drain pipe to
prevent the condensate water overflowing.
b. Wrap the pipe from the bottom of the outdoor unit to the top of the pipe where it enters the wall. During the
wrapping, the later circle should cover half of the former one.
c. Fix the wrapped pipe on the wall with clamps.
1) Do not wrap the pipe too tightly; otherwise the insulation effect will be weakened. Additionally, make sure the
drain hose is separated from the pipe.
2) After that, fill the hole on the wall with sealing material to prevent wind and rain coming into the room.
4.2.4 Support and protection for pipeline
Support should be made for hanging refrigerant pipe. Distance between each support can not be over 3 ft..

4.3 Air Purging and Refrigerant Charge

4.3.1 Air purging
(1) Refrigerant has been charged into the outdoor unit before shipment, though additional refrigerant may still
need be charged into the refrigerant pipe during the field installation.
(2) Check that the liquid valve and the gas valve of the outdoor unit are closed fully.
(3) As shown in the following figure (Fig.10), evacuate the indoor unit and refrigerant pipe using a
vacuum pump.
(4) When the compressor is not running, charge the R410A refrigerant into the refrigerant pipe from the liquid
valve of the outdoor unit (do not do it from the gas valve).
4.3.2 Additional refrigerant charging
(1) Refrigerant Charge in the Outdoor Unit before Shipment
1) Outdoor unit has been charged with refrigerant before delivery. No refrigerant charge is included
in the indoor unit or the refrigerant pipe.
2) The amount of the additional refrigerant charge is dependent on the diameter and length of the liquid refrigerant
pipe which is decided by the actual installation requirement.
3) Record the additional refrigerant charge for future maintenance.
Inverterflex Series
Manometer
"LO"Knob
liquid valve
Connection hose
Gas valve
NOTICE
Manometer
"HI"Knob
Vacuuming pump
Fig 10
11
12