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TM 55-1905-220-14-8
4-31. CONDENSER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Continued).
2
Installing tubes.
A
Obtain tubes of correct length. Tubes should be of the length shown on the condenser
assembly drawing. If too long, tubes should be cut to required length. Edges of tubes should
be chamfered.
B
Place tube in position between tube sheets.
C
"Set" or expand one end of tube into tube sheet hole to prevent tube from rotating while it is
being rolled. Use a drift pin to "set" one end of tube while using a dolly bar to back opposite
end of tube.
D
Expand tube using special "tube expander" tool furnished for this purpose. Use of tube
expander is described below. After tubes are expanded, face them off flush with tube sheet.
3
Use of tube expander.
Attach condenser tube expander to a slow speed reversing air motor or hand brace. Apply
lubricating oil freely to expander rollers before using. Place expander into tube and roll tube
until a tight joint is made. At frequent intervals remove tube expander, rinse in kerosene to
remove scale and apply oil to prevent overheating. Keep tube expander clean and well
lubricated. Avoid using worn, rough or chipped rollers or mandrel. After rolling tube, test for
a tight joint and reroll if necessary.
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