TCL TCC-09C2HRH/DV, Руководство по обслуживанию, Страница: 41 / 75

TCL Air Conditioner Service Manual
41
2.7 Vacuum Drying and Leakage Detection
2.7.1 Safety Precautions
●
Use a vacuum pump with a gauge reading lower than -0.1 MPa and an air discharge capacity
above 40L/min.
● T
he outdoor unit does not need vacuuming. DO NOT open the outdoor unit's gas and liquid stop
valves.
●
Ensure that the Compound Meter reads -0.1 MP a or below after 2 hours. If after three hours of
operation and the gauge reading is still above -0.1 MPa, check if there is a gas leak or water inside 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.