10-21. AIR CONDITIONING SYSTEM SERVICING (M1010) (Cont).
Ensure that DISCHARGING SYSTEM is performed to remove all
contamination and refrigerant from air conditioning system before
performing EVACUATING SYSTEM.
Completely close low side valve (1) and high side valve (4) on manifold gage set.
Remove protective caps from low pressure line (8) valve and high pressure line (9) valve.
Connect low pressure hose (7) to low pressure line valve and high pressure hose (5) to high
pressure line valve.
Wrap end of center hose (6) with a clean rag. Slowly open high side valve (4). Observe center
hose (6) for evidence of refrigerant oil in rag. Adjust high side valve toward closed position to
prevent refrigerant oil from escaping while discharging system.
When high side gage (3) reads 50 psi (345 kPa), slowly open low side valve (1). Refrigerant
should flow at an even rate from both sides of system.
When both gages reach O, completely close low side valve (1) and high side valve (4) on
manifold gage set.
1 0 - 8 0