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4-9. Charging the System
a. Evacuate the system, refer to paragraph 4-8.
b. Bleed the charging equipment as follows:
(1) Connect metered refrigerant charging
bottle to drum of R-12.
(2) Connect outlet of charging bottle to gauge
manifold by means of the charging hose.
(3) Open refrigerant drum valve.
(4) Open fitting on inlet to metered bottle and
allow vapor to Sweep through line.
(5) Tighten fitting on inlet to metered bottle
and open inlet valve slightly.
(6) open vent valve on charging bottle and
allow R-12 vapor to sweep through bottle.
(7) Close vent, close inlet valve. Open outlet
valve and loosen hose fitting on gauge manifold.
(8) Open inlet valve to metered bottle and
allow R-12 vapor to sweep through inlet hose,
bottle and outlet hose to gauge manifold.
(9) Tighten
hose connections to manifold
valve, shut outlet valve from metered bottle.
(10) Invert R-12 drum and feed 2.5 lbs. of
liquid refrigerant into metered bottle (opening the
vent valve very slightly will facilitate this process.)
(11) Close inlet valve to metered bottle and
valve vent.
Vote. Make sure that the bottle contains 2.5 lbs. of
refrigerant If necessary place slightly more than 2.5 lbs. in
bottle and bleed off excess through vent.
c. Refer to figure 4-4 and charge the system.
d. Backseat the receiver valve. Close all valves in
charging system
and remove hose fitting from
receiver valve. Replace stem cap and gauge port
cap. System is now ready for operation.
4-7
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