Chapter Ⅱ Installation（8. Charging of Refrigerant）
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7.2.2 Connecting method for multiple module
8. Charging of Refrigerant
8.1 Leak Detection of System
Generally we use soapy water to conduct lead detection. Smear soapy water to the points
where are possible to leak (welding points, spools, joints, etc.), if there are bubbles, it means there
is leakage, it should be welded again or repaired.
If it‟s difficult to detect the leaking point with soapy water, users can use electronic leak
detector or charge nitrogen 20Kgf/cm2 into the system and then put it into water tank to detect.
8.2 Vacuum Pumping
Vacuum pumping must be conducted with vacuum pump. Operating procedures are as
follows:
1）Screw off the nut cap (for charging Freon) of air intake duct;
2）Connect the low-pressure soft tube of vacuometer to the joint of Freon charging spout;
3）Connect intermediate tube of vacuometer to pressureproof soft tube, another end of soft
tube is connected to vacuum pump;
4）Screw up the high pressure gauge, open the low pressure gauge, and then energize the
vacuum pump;
5）When the needle pointer of vacuometer points at 15mmHg (gauge pressure), screw up the
low pressure gauge, de-energize the unit, screw off the soft tube in Freon charging spout, and
then cover the nut cap.
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