TM 5-4220-211-12&P
WARNING
If pressure goes over 3260 PSIG, shut down compressor immediately.
NOTE
During initial start-up, a knocking sound will be generated by the floating piston in the third stage. This
knocking sound will continue for several seconds until the air pressure in the third stage is high enough to
hold the floating piston against the third stage guide piston. This knocking sound is completely normal
and is not a cause for alarm.
(11) Let compressor build to maximum pressure of 3260 PSIG and listen for fourth stage safety valve to lift.
Note blowoff pressure on pressure gauges (21, Fig. 1-3).
c.
During Operation
(1)
Charge SCUBA cylinders (Ref. para. 3-6).
(2) Bleed moisture separator drain valves (16, 23, Fig. 1-3) and purifier drain valve (17, Fig. 1-3) every 15
minutes while compressor is running.
d.
Shut down
(1)
Open moisture separator drain valves (16, 23, Fig. 1-3) and filling valve (Fig. 3-5).
CAUTION
Do not open air purifier drain valve (17, Fig. 1-3).
(2)
Move speed control lever (1, Fig. 3-3) to half position and idle compressor for 3-5 minutes with no load.
(3)
Hold speed control lever down until engine stops (6, Fig. 3-3).
(4)
Make appropriate entries into equipment logbook for stop time and total hours.
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