Air Exhaust - Hisense 12К Manual De Instrucciones

(3) After connecting the refrigerant piping, seal the refrigerant pipes by using the factory-supplied insulation
material as shown in Fig5.3.
● Cap the end of the pipe when the pipe is to be inserted through a hole.
● Do not put pipes on the ground directly without a cap or vinyl tape at the end of the pipe.

5.3 Air Exhaust

Air and moisture remaining in the refrigerant system have undesirable effects.
Therefore, they must be purged completely following the steps.
Air Purging with a Vacuum Pump
(1) Check that each tube (both narrow and wide tubes between the indoor and outdoor units) have been properly
connected. Note that both narrow and wide tube 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 and till the pressure is lower than -755mm Hg for 5 minutes.
(5) With the vacuum pump still running, demount tube 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 wide and narrow tube valves stem 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 tube
Hex wrench
Wide tube
Bonnet of wide valve
Bonnet of narrow valve
Service valve
Bonnet of service valve
Fig.5.4 Air Purging
Insulation for
Indoor unit
Pressure
gauge
Manifold
valve
Vacuum pump
21
Installation and Maintenance
Outdoor unit