TM 5-3805-291-23-2
AIR CONDITIONING SYSTEM SERVICE - CONTINUED
0222 00
EVACUATION - CONTINUED
N OT E
Vented exhaust valve must remain closed until vacuum pump has started.
8.
Open vented exhaust valve (19).
N OT E
Between 28 and 29 in. Hg (95 and 98 kPa) is the required pressure specification at sea level. For every 1,000
ft (305 m) above sea level, decrease required specification by 1 in. Hg (3 kPa).
9.
Operate vacuum pump (18) until low pressure gage (20) indicates pressure between 28 and 29 in. Hg (95 and 98 kPa),
then close vented exhaust valve (19). Operate vacuum pump for a minimum of 90 minutes after closing vented exhaust
valve.
N OT E
Maximum vacuum loss in 5 minutes must not exceed 2 in. Hg (7 kPa). Excessive vacuum loss may indicate a
system leak.
10.
Close low pressure valve (11) and high pressure valve (12).
11.
Turn off vacuum pump (18).
0222 00-5