(3) After connecting the refrigerant piping,seal the refrigerant pipes by using the factory-supplied insulation
material as shown in Fig 5.3.
●
Cover the end of the pipe with a cap while inserting the pipe through a hole.
●
Do not place pipes on the ground directly without a cap or vinyl tape at the end of the pipe.
5
.
3
Air Exhaust
Installation and Maintenance
21
Air and moisture remaining in the refrigerant system case undesirable effects.
Therefore, they must be removed completely with the following steps.
Air Purging with a Vacuum Pump
(1) Check that each pipe (both narrow and wide pipes between the indoor and outdoor units) is properly
connected. Note that both narrow and wide pipe valves on the outdoor unit are kept closed at this stage.
(2) Using an adjustable wrench or box wrench, remove the bonnet from the service valve.
(3) Connect a vacuum pump and service valve together tightly.
(4) Turn on the vacuum pump with the pressure lower than -755mm Hg for 5 minutes.
(5) With the vacuum pump still running, demount the pipe of vacuum pump from the service valve. Then stop the
vacuum pump.
(6) Replace the bonnet on the service valve and fasten it securely with an adjustable wrench or box wrench.
(7) Using an adjustable wrench or box wrench, remove the bonnet of both narrow and wide valve.
(8) With the hex wrench, turn the stem of wide and narrow pipe valves counter clockwise to fully open the valves.
(9) Replace the bonnets on the wide and narrow valves and fasten it securely with an adjustable wrench or box
wrench.
Narrow pipe
Hex wrench
Wide pipe
Service valve
Bonnet of service valve
Bonnet of narrow valve
Bonnet of wide valve
Indoor unit
Outdoor unit
Manifold
valve
Pressure
gauge
Vacuum pump
Fig
.
5.4 Air Purging
Insulation for
Cord Clamp
(Factory-Supplied)
Refrigerant Pipe
(Factory-Supplied)
(Factory-Supplied)
(Factory-Supplied)
(Factory-Supplied)
Insulation for
Refrigerant Pipe
Insulation Material
Unit Side
Fig
.
5
.
3
Insulation on Pipes
Содержание RCI-1.5TNE1NH
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