TM 9-2320-289-34
10-21. AIR CONDITIONING SYSTEM SERVICING (M1010) (Con’t).
b.
EVACUATING SYSTEM
CAUTION
Compressor (10) should not be used as a vacuum pump. Failure to follow
this caution may result in damage to compressor.
NOTE
If air conditioning system is determined to be leaking at any time while
performing EVACUATING SYSTEM, air conditioning system will have to be
charged and checked for leaks.
1.
Connect center hose (6) to vacuum pump (11), Completely open low side valve (1) and high
side valve (4), Open discharge valve on vacuum pump.
2.
Start vacuum pump (11), Low side gage (2) should go down to 29 in. Hg. If 29 in. Hg is not
obtained, there is a leak in air conditioning system. Locate leak, if present, using refrigerant
gas leak detector. Repair leak in system, if present, before performing step 3.
TA50448
10-81
