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 TM 55-1905-220-14-8
4-31. CONDENSER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Continued).
(2) To inspect the condenser water side, secure the compressor without pumping down the system.
Drain water side by removing drain plugs (or opening drain valves) in bottom of water heads and removing vent
plugs (or opening vent valves) atop water heads. Remove water heads on both ends of condenser and inspect
tubes and water heads.
(3) Clean condenser tubes with a soft, flexible brass or nylon bristle tube cleaning brush attached to a
rod long enough to pass through entire length of tubes. Flush water through tubes during scrubbing. Take care
not to destroy the thin protective film of corrosion products on the inner surfaces of tubes during cleaning. After
cleaning, reassemble water heads, connect water lines and flush condenser to remove any sediment.
(4) Inspect zinc protector rods in condenser water heads about once a month. Replace rods showing
appreciable corrosion.
(5) Disassemble and clean the condenser water regulating valve at regular intervals.
CAUTION
Whenever a condenser is shut down, if there is danger of
reaching freezing temperatures in machinery room, drain
condenser water.
A freeze-up may seriously damage
condenser tubes.
d. Tube Repairs.
(1) The condenser should be tested for leaks periodically, preferably every two weeks.
(a) Temporary Tube Repairs.
A leaking condenser tube (whether split or pitted) may be temporarily repaired by means of
tapered plugs (1/16"/ft taper). Insert a plug into each end of a leaking tube and drive it in tight enough to hold
and not leak at maximum condenser pressure. Plugs can be made of wood, plastic or rawhide of sufficient
length to allow removal if and when a new tube is installed.
4-945
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