Pioneer QUANTUM INVERTER Series Service & Troubleshooting Manual page 47

Air Purging with Vacuum Pump:
Procedure:
1. Tighten the flare nuts of the indoor and outdoor
units, and confirm that both the 2- and 3-way valves
are closed.
2. Connect the charge hose with the push pin of Handle
Lo to the gas service port of the 3-way valve.
3. Connect another charge hose to the vacuum pump.
4. Fully open the Handle Lo manifold valve.
5. Using the vacuum pump, evacuate the system for 30
minutes.
a. Check whether the compound meter indicates
-0.1 MPa (14.5 Psi).
• If the meter does not indicate -0.1 MPa (14.5
Psi) after 30 minutes, continue evacuating for
an additional 20 minutes.
• If the pressure does not achieve -0.1 MPa (14.5
Psi) after 50 minutes, check for leakage.
b. Wait for 5 minutes then check whether the gauge
6. Loosen the flare nut of the 3-way valve for 6 or 7
seconds and then tighten the flare nut again.
a. Confirm the pressure display in the pressure
b. Remove the charge hose from the 3-way valve.
7. Fully open the 2- and 3-way valves and tighten the
cap of the 2- and 3-way valves.
Maintenance 6
 
• If the pressure successfully reaches -0.1 MPa
(14.5 Psi), fully close the Handle Lo valve, then
cease vacuum pump operations.
needle moves after turning off the vacuum pump.
If the gauge needle moves backward, check
wether there is gas leakage.
indicator is slightly higher than the atmospheric
pressure.