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The connection between an indoor unit and an outdoor unit.
• 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 a leaking indoor unit.
• Fit the flare nut to the liquid pipe.Flare the pipe‘s end with flare tool.
• Tighten both flare nuts into gas pipe and liquid pipe at the indoor unit with two holding spanners.
Air Purging and Check of Pipe Leakage
PURGING BY USING VACUUM
The purpose of air purging is to get rid of moisture
and air in the system,otherwise moisture and air may
cause ineffectiveness of the compressor which di-
rectly affects the cooling capacity.
• Remove a blank cap of a three-way valve by using a
torque wrench.Check if both high pressure and low
pressure valves are in closed condition.
• Remove the nut of the service port.
• Connect a gauge into the service port and a vacuum
pump.
• Vacuum until the gauge indicates at 30 inches mer-
cury pressure.
• Remove gauge.Tighten up the nut of 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.
GAS LEAKING CHECK
• Check leakage by apply soapsuds to every con-
nection and inspect carefully.After checking,wipe
them off completely.
• Cover indoor unit joint with pipe insulation and 4
plastic bands to prevent condensation at joints.
Vacuum Pump
open
closed
Gauge
Outdoor unit
Point at 30 inches
mercury pressure
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