Roland FAVORITE ON-OFF Series, Руководство по обслуживанию

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Page 19
Air purging with vacuum pump
Procedure:
1.
Tighten the
fl
are nuts of the indoor and outdoor
units, and con
fi
rm 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.
• 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 o
ff
the vacuum pump.
6. Loosen the
fl
are nut of the 3-way valve for 6 or
7 seconds and then
�
ghten the
fl
are nut again.
c. Con
fi
rm the pressure display in the pressure
indicator is slightly higher than the atmospheric
pressure.
d. Remove the charge hose from the 3-way valve.
7.
Fully open the 2- and 3-way valves and
�g
hten the
cap of the 3-way valve.
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