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Installation Instructions
6. Vacuum Pumping and Charging Refrigerant
· Vacuum Pumping
(1) Remove the service port cap of the stop valve on the gas pipe
side of the outdoor unit.
(2) Connect the manifold gauge and vacuum pump to the service port
of the stop valve on the gas pipe side of the outdoor unit.
(3) Run the vacuum pump. (Let it work for at least 15 minutes.)
(4) Check the vacuum with the gauge manifold valve, then close the
gauge manifold valve and stop the vacuum pump.
(5) Leave it as-is for one or two minutes. Make sure the pointer of the
manifold gauge remains in the same position. Confirm that the
pressure gauge shows -14.7 psig (-0.101MPa or -760mmHg).
(6) Remove the manifold gauge quickly from the service port of the stop
valve.
(7) After refrigerant pipes are connected and evacuated, fully open
all stop valves on both sides of gas pipe and liquid pipe.
(8) Open adjusted valve to add refrigerant (refrigerant must be liquid).
(9) Tighten the cap to the service port .
(10)
Re-tighten the cap.
(11)
Leak/foam test with halogen leak detector to check the flare nut and
brazing points of leak. Use foam that does not generate ammonia
(NH3) in the reaction.
· An excess or a shortage of refrigerant is the main cause of issues with the unit. Charge the correct refrigerant
quantity according to the description of label at the inside of the manual.
· Check for refrigerant leakage in full detail. If a large refrigerant leakage occurs, it can result in difficulty breathing for
inhabitants, and/or harmful gases can occur if a source of fire is used in the room.
· Additional R efrigerant C harge
The unit has been pre-charged with refrigerant.
Please refer to "Piping Requirement" to calculate the additional charge.
After vacuum pump procedure has finished, first exhaust air from the charge hose, next open the valves.
Charge refrigerant as "liquid" type through the liquid stop valve.
At the end, close valves, and record the charged refrigerant quantity.
CAUTION
！
危
Filling Using a Cylinder with an Attached Siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside,so the
cylinder need not be upside-down to fill with
liquid.
险
Filling with Other Cylinders
Turn the cylinder upside-down when filling.
8
Fig.9.2
Indoor Unit
Outdoor Unit
Pressure
Gauge
Manifold
Valve
Charge Hose
(for R410A)
Vacuum
Pump
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