ICP HMC009KD, Руководство по обслуживанию

Страница: 39 / 83

- 39 -
§
Evacuation
1. Connect the charge hose end described in the
preceding steps to the vacuum pump to evacuate the
tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is open.
Then, run the vacuum pump.
The operation time for evacuation varied with the
tubing length and capacity of the pump. The following
table shows the amount of time for evacuation.
Allow the pump to operate until the system has been
evacuated down to 300 microns. Allow the pump to
continue running for an additional 15 minutes. Turn off
the pump and leave the connections secured to the
two service valves. After 5 minutes, if the system fails
to hold 500 microns or less, check all connections for
tight fit and repeat the evacuation procedure.
2. When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and stop the vacuum
pump.
§
Finishing the job
1. With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
2. Turn the valve stem of gas side valve counter-clockwise
to fully open the valve.
3. Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then remove
the hose.
4. Replace the flare nut and its bonnet on the gas side
service port and fasten the flare nut securely with an
adjustable wrench. This process is very important to
prevent gas leakage from the system.
5. Replace the vlave caps at both gas and liquid side service
valves and fasten them securely tight.
This complete air purging with a vacuum pump. The air
conditoner is now ready to test run.
Lo Hi
Indoor unit
Outdoor unit
Manifold valve
Vacuum pump
Pressure
gauge