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DC Inverter Floor Ceiling Type Air Conditioner Installation and Operation Manual
Avoid pipe bending as much as possible, if it is necessary, the bending radius must be more than 3 or 4 cm.
Connection between an Indoor unit and an Outdoor Unit:
① Unscrew the flare nut for releasing pressure gas in the indoor unit. If there is no high pressure gas
blowing out, it is the signal of leakage for the indoor unit.
② Fit the flare nut to the liquid pipe. Flare the pipe's end with flare tools.
③ Tighten both flare nuts into gas pipe and liquid pipe at the indoor unit with two spanners.
11.5.3 Air Purging
The purpose of the air purging is to get rid of moisture and air in the system, otherwise moisture and air may
cause ineffectiveness of the compressor which directly affects the cooling capacity.
Purging by Using Vacuum
After tightening the flared nuts between the indoor and the outdoor unit
♦ Remove the blank cap of a three-way valve by using a torque wrench,
and then check if both high pressure and low pressure valves are in closed
condition or not.
♦ Remove the nut at the service port.
♦ Connect a gauge into the service port and a vacuum pump.
♦ Remove the gauge and tighten up the nut at the service port.
♦ Use a hexagonal wrench to open both high pressure and low pressure
valves to the end (counter clockwise).
♦ Tighten the blank cap of the three-way valve.
Gap Leakage Check
♦ Check if it leaks or not by applying soapsuds on every joint and then
inspect carefully. After the check, wipe them off completely.
♦ Cover the indoor unit joint with pipe insulation and four plastic bands
to prevent condensing at joints.
Fig.61
Fig.62
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