Roland FAVORITE ON-OFF Series Service Manual page 23

Air purging with vacuum pump
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Procedure:
Tighten the flare nuts of the indoor and outdoor
1.
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 the charge hose of Handle Hi connec�on 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)
a�er 30 minutes, con�nue evacua�ng for an
addi�onal 20 minutes.
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• If the pressure does not achieve -0.1 MPa
(14.5 Psi) a�er 50 minutes, check for leakage.
• If the pressure successfully reaches -0.1 MPa
(14.5 Psi), fully close the Handle Lo valve and
cease vacuum pump opera�ons.
b. Wait for 5 minutes then check whether the gauge
needle moves a�er turning off the vacuum pump.
Loosen the flare nut of the 3-way valve for 6 or
6.
7 seconds and then �ghten the flare nut again.
c. Confirm the pressure display in the pressure
indicator is slightly higher than the atmospheric
pressure.
d. Remove the charge hose from the 3-way valve.
Fully open the 2- and 3-way valves and �ghten the
7.
cap of the 3-way valve.
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