Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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P00877Q
8.2 Vacuuming
(1) Connect a manifold gauge and vacuum pump to the check joints (Gas Stop Valve and Liquid Stop
Valve).
(2) Continue vacuum pumping work until the pressure reaches -14.5 psi (-0.1MPa, -756mmHg) or lower
for one to two hours.
Once the desired vacuum pressure has been reached, turn OFF the pump and leave the gauge for
one hour. Verify that the pressure inside the manifold gauge has not increased.
(3) Tighten the caps on the check joint according to torque specs (as indicated in Section 8.1-(2)-(d), after
vacuum pumping work is complete.
(4) If the pressure inside the gauge does not reach -14.5 psi (-0.1MPa, -756mmHg), a gas leak is
suspected.
(5) Inspect for any gas leakage once again. If no leakage exists, resume vacuum pumping for another one
to two hours. If moisture remains inside the piping, the compressor may be damaged.
NOTICE
1. Use tools or measuring instruments exclusively devised for use with R410A.
2. DO NOT perform vacuum pumping work with the valves of the outdoor units open. Otherwise,
refrigerant charged before shipment can leak out and the operation can result in failure.
8.3 Charging Work
(1) An additional refrigerant charge is required according to total piping length. Refer to Table 8.1.
(2) After vacuum pumping work, check that the gas valve, and liquid stop valve are fully closed.
Charge the additional refrigerant from the check joint of liquid stop valve (acceptable error must be
within 1.1 lbs (0.5 kg)).
(3) After refrigerant has been charged, fully open the liquid stop valve and gas stop valves.
NOTE:
Gas remaining at the O-ring or screw component may emit a hissing sound when removing the spindle
cap. However, this is not leaking gas.
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below.
(a) Fully open the stop valve at the gas line side.
NOTICE
Do not apply excessive force to the spindle valve after fully opening the spindle. Otherwise, the spindle
valve will blow out due to refrigerant pressure. At the test run, fully open the spindle valve. Otherwise, these
devices will be damaged. (It is closed before shipment.)
< Caution for Opening Stop Valve >
1. Do not apply an excessive force after fully opening the spindle (Tightening Torque: < 3.7 ft·lbs
(5.0 N·m)). (This valve does not have a hard stop when opening, and allows for the complete removal of
the valve stem.)
2. Securely tighten the caps according to the
torque specs (Section 8.1-(2)-(d) after each
spindle valve is opened.
O-ring
(Rubber)
Spindle Valve
Counterclockwise...Open
Clockwise...............Close
Closed before shipment
Refrigerant Pressure
Cap
(To open or close spindle valve)
Check Joint
(Only the charging hose for
R410A can be connected.)
Hexagonal Wrench
Gas: 3/8 inch
Liquid: 3/16 inch