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 TM 55-1905-219-14-8
4-32. DRYER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS.
a. The dryer is a cylinder containing one or more cartridges filled with activated alumina or silica gel.
After prolonged use, the dryer becomes saturated with moisture and oil and the cartridges must be replaced.
b. The dryer cartridges are accessible for replacement by removing the flanged cover plate. Before
opening dryer, pump it down. The dryer is installed in a bypass, close dryer inlet and bypass valve, open dryer
outlet valve, and allow plant to pump down. When dryer begins to warm up, liquid refrigerant has been
removed. Close dryer outlet valve and open bypass valve to restore liquid refrigerant flow to evaporator.
Open dryer by removing capscrews and nuts around cover plate. Remove cover and gasket. Pull out safety
cap, spring and cartridges. Do not let dirt get into dryer shell. Insert new cartridges and reassemble dryer with
a new cover plate gasket. Secure cover plate firmly.
NOTE
Only in an emergency, reactivate dryer cartridges
by heating to 250- 300F (121- 149 ) to drive
C
out moisture. Otherwise, install only new cart-
ridges taken from sealed containers.
This task covers:
a. Inspection
b. Service
c. Replace
INITIAL SETUP
Test Equipment
References
Paragraph
NONE
4-28e(5)
Pumping Down
4-28r
Leak Detection
4-35.6
Tubing Maintenance
Equipment
Special Tools
Condition Condition Description
NONE
NONE
Material/Parts
Special Environmental Conditions
Cartridge 4440-00-494-9427
NONE
Personnel Required
General Safety Instructions
1
Observe safety precautions in
4-928
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