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TM 5-4120-287-15
i.
Close the air conditioner charge valve.
j.
Close the refrigerant-12 bottle valve.
k.
Disconnect the evacuation and charge hose from the charge valve.
l.
Disconnect the refrigerant supply hose from the refrigerant-12 bottle, and remove the platform scale of the charging
unit.
m. Lock the platform scale beam lock.
n.
Disconnect the vacuum pump power cord from power source.
o.
Inspect the refrigerant system for leaks (para 7-6).
p.
Install the air conditioner right-side panel assembly (para 3-29 c).
7-10. Adding Compressor Oil
a.
General. Oil is added to the refrigerant system only when oil is lost due to discharging the refrigerant system or
replacing a major component. Oil is added after the refrigerant system is discharged and evacuated (para 7-7 and 7-8)
and prior to charging (para 7-9).
b.
Adding Oil. Using the apparatus shown in figure 7-2, add oil to the refrigerant system as follows:
(1) Discharge refrigerant (para 7-7).
(2) Evacuate refrigerant system according to paragraph 7-8, steps a through i.
(3) Place oil (FED SPEC VV-L-825 RCO-3 Type III), in sufficient quantity to make up the oil needed (as noted in
paragraph 7-7, step e) into the graduated cylinder. In addition add sufficient oil to graduated cylinder to make up for any oil
drained from a removed refrigerant system component.
(4) Open oil flow control valve (fig. 7-2) and place dip tube into graduated cylinder; then close oil flow control valve.
(5) Connect oil delivery tube to air conditioner charge valve.
(6) Open air conditioner charge valve.
(7) Using the oil flow control valve, allow sufficient oil to enter the refrigerant system to make up for lost oil; then
close oil flow control valve.
NOTE
Do not permit the graduated cylinder to drain below the immersed tip of the dip tube. Close the (oil flow
control valve, and add more oil to the graduated cylinder if required.
(8) Close air conditioner charge valve.
(9) Remove oil delivery tube from air conditioner charge valve.
(10)Evacuate refrigerant system (para 7-8).
Figure 7-2. Apparatus for adding oil to refrigerant system.
7-5
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