AIR CONDITIONING (Cont) - TM-55-1905-223-24-170215

TM 55-1905-223-24-17

Table 4-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

(3)

If refrigerant has been lost due to a leak and pressure is below 175 psig, add

enough R-22 refrigerant to system so that pressure is increased 175 psig

before checking for leaks (Malfunction 6). Locate and correct required.

WARNING

Pump down, or remove, refrigerant before opening the system for repairs.

(4)

Pump down, or remove, the refrigerant charge as required by corrective action.

(5) After corrective action complete, add R-22 refrigerant (Malfunction 3) or

remove charge, evacuate, and recharge system (paragraph 4-10) as appropriate.

(6)

Pump down the system (A/C-2 only):

WARNING

PRESSURIZED GAS HAZARD. The refrigerant charge in the system can be

pumped down and isolated into the condenser and receiver ONLY. If it is

necessary to gain access to components in discharge line from compressor,

including the discharge valve, the refrigerant charge must first be removed from

the system to avoid personal injury.

NOTE

If the condenser, receiver or any other large component is removed, the system

must be discharged and put under a vacuum for at least 6 hours.

(7)

With the unit operating, close the refrigerant line outlet valve from the receiver.

4-8