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the pipe. If there is no leakage, perform another evacuation for 1 or 2 hours.
● DO NOT use refrigerant gas to evacuate the system.
2.7.2
Evacuation Instructions
NOTE: Before using manifold pressure gauge and vacuum pump, please read their operating
instructions and be familiar with how to use the manual correctly
1.
Connect the hose of manifold pressure gauge to the maintenance port on the low pressure
valve of outdoor unit.
2.
Connect another hose from manifold pressure gauge to vacuum pump.
3.
Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed.
4.
Turn on the vacuum pump to empty the gas in the system.
5.
Run the vacuum pump for at least 15 minutes, or until the compound meter reads - 76cmhg (-
1 X105pa).
6.
Close the low pressure side of the manifold pressure gauge and close the vacuum pump.
7.
Wait for 5 minutes and check whether the system pressure changes.
NOTE: If there is no change in system pressure, unscrew the cap from the high pressure valve.If
there is a change in system pressure, there may be a gas leak.
8.
Insert a hex wrench into the high-pressure valve and open the valve by turning the wrench in a
1 /4 counter clockwise turn. Listen for any gas coming out of the system and close the valve after 5
seconds.
9.
Observe the pressure gauge for one minute to make sure that the pressure does not change.
The pressure gauge should read slightly above atmospheric pressure
10.
Remove the charge hose from the service port.
11.
Using hexagonal wrench, fully open both the high pressure and low pressure valves.
12.
Tighten valve caps by hand, then tighten it using the proper tool.
NOTE: When opening valve stems, turn the hexagonal wrench until it hits against the stopper.
DO NOT try to force the valve to open further.
2.7. 3 Leakage Detection
1).With leakage detection.
Check if there is leakage with leakage detection.
2).With soap water. If leakage detection is not available, please use soap water for leakage
detection. Apply soap water at the suspected position and keep the soap water for more than 3min. If
there are air bubbles coming out of this position, there a leakage.
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