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The air is evacuated in the pipe from the check valve with a vacuum pump if no leakage exists, then
loosens the cores of the liquid valve and gas valve and clears the soap water with dry cloth.
◆ If the vacuum pumps and high-pressure nitrogen are not available, we can operate as following:
Remove the cores of the liquid valve and gas valve and loosen the cores of check valve on the gas
valve and the gas will exhaust. Keep exhausting for 15 seconds, tightening the check valve as refrigerant
gas coming out.
Loosen the liquid valve and gas valve.
Tighten the bonnet of the valve, and examine the air leakage at the connecting position with soap
water or gas leakage detector, then clear the soap water with dry cloth.
◆ Wrap the flare nut with insulation material to avoid the condensation dropping after finishing
the preceding procedure.
The refrigerant in the conditioner unit is enough for the connecting pipes of 7.5 meters, if the pipe
is longer than 7.5 meters, additional supplement refrigerant should be supplied. The maximum pipe
length is 50 meters. When the height difference between the indoor unit and outdoor unit is larger than
10 meters, an oil bend should be employed for every 6 meters.
Additional supplement refrigerant as per the extended connection pipe:
Model
FSL-850B-H-3F
FSOL-850B-3F
Size of Fitting Pipe
(mm)
Liquid
Gas Pipe
Pipe
9/8
1/2
Max. Height
Difference
Max. Pipe
between
Length (m)
Indoor Unit
and Outdoor
Unit(m)
50
30
34
Amount of
Additional
Refrigerant to be
Filled (For Extra
Length of Pipe)
(Standard Pipe
Length 7.5m)
110g/m
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