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Figure 4-32. Evaporator Coil Repair
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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COUPLING HALF, MALE (EVAPORATOR REFRIGERANT PIPING DISCONNECT)
TM 5-4120-359-14
c.
Repair
(1) Repairs are limited to replacement of distributor, rivets, plate nuts, and the straightening of mashed fins.
(2) Plate nuts may be removed by drilling out the old rivets using a drill bit slightly smaller than the diameter of
the rivet.
(3) Install new plate nut(s) and rivets.
(4) If fins are mashed or dented so that the air flow across the coil would be blocked, straighten them using a
plastic fin comb.
(5) To replace the distributor, debraze the distributor from the three distributor lines. Braze the new distributor to
the three lines. Check to be sure that all three lines are clear and not blocked internally with solder or flux.
d. Reassembly/Installation
(1) Tubing should be nitrogen purged during all brazing/debrazing operations.
(2) Place distributor in expansion valve.
(3) Wrap wet rags around expansion valve body and distributor tubes.
(4) Using torch, braze distributor to expansion valve joint in accordance with paragraph 4-7.
(5) Wrap wet rags around evaporator coil header.
(6) Using torch, braze elbow in place on header in original position. See paragraph 4-7.
(7) Replace the insulation tape (black cork tape) that was removed prior to debrazing. Use insulation tape, item
WARNING
When handling coils, wear gloves to avoid cuts and reduce fin damage on the coil.
(8) Carefully place the evaporator coil, tubing, and fittings into the housing.
(9) Reaching in access area, and using care, push half couplings through holes in access.
(10) Line up coil assembly and housing screw holes.
(11) Using screwdriver, fasten coil to housing with six screws and washers.
(12) Using screwdriver, fasten three cushioned loop clamps to housing with three screws.
(13) Using wrench, install jam nuts on half couplings in access.
(14) Using wrench, carefully reconnect the low and high condenser to evaporator refrigerant metal hose line
connectors to the coupling halves.
(15) Replace the dehydrator. (See paragraph 4-73.)
(16) Leak test the coil, the dehydrator, the newly brazed joints and the joints in the area of the newly brazed joints
4-80

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