TM-9-6920-430-14

COOLANT RECHARGING UNIT, TRAINING GUIDED MISSILE SYSTEM M80 AND CHARGER, BATTERY PP-7309/T

TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

AUGUST 1980

TM-9-6920-430-14 - Page 131 of 180

TM 9-6920-430-14

3-16. DESICCANT REPLACEMENT

During non-operating use, GPU is pressurized at 500 psig with argon gas to

minimize system contamination.

This pressure must be vented before

replacing desiccant cartridge.

a. Insure that the gas supply valve on the supply bottle is closed fully clockwise.

b. Disconnect the power cable from the ac source. Disconnect the gas supply bottle

according to the instructions contained para. 3-13 steps a through d.

When performing the steps below, care must be taken to minimize system

contamination. The area must be free of wind, drafts or dust movement.

c. Insure that INLET BLEED valve (1) is opened (two turns counterclockwise). Open

the OUTLET BLEED valve (2) two complete turns counterclockwise. Very slowly open

the OUTLET SHUTOFF valve (3) and the INLET SHUTOFF valve (4) to relieve all the

gas in the system. The INLET PRESSURE gage (5) and outlet PRESSURE gage (6) must

read 0 psig.

Change 1

3-69