TM 9-4120-371-14
b. Repair
(1)
Repairs are limited to replacement of rivets, plate nuts, and straightening of mashed fins.
(2)
Plate nuts may be removed by drilling out old rivets using a drill bit slightly smaller than the
diameter of the rivet.
Install new plate nut(s) and rivets.
(3)
(4)
If fins are mashed or dented so that air flow across coil would be blocked, straightened them using
a plastic fin comb.
c. Installation
When handling coils, wear gloves to avoid cuts and reduce fin damage on the coil.
(1) Carefully slide evaporator coil down into unit.
(2) Slide both evaporator coil brackets into place.
Aline and loosely install eight screws and packing with retainers that secure evaporator coil
(3)
brackets to casing sides.
(4)
Aline and loosely install two screws that attach mist eliminator brackets.
Aline and loosely install remaining six screws and flat washers in lower mounting flange holes.
(5)
(6)
Using screwdriver, tighten all evaporator mounting hardware.
(7)
Using screwdriver, secure the two side panel inserts with four screws.
Reassemble expansion valve. (See para 5-22.)
(8)
(9)
Using screwdriver, secure distributor line clamp with a screw, lock washer, and flat washer.
(10)
While purging the system with nitrogen, braze the tube joints. (See para 5-7 and 5-8.)
(11)
Replace the dehydrator. (See para 5-13.)
(12)
Leak test all newly connected joints and those in the repair area. (See para 5-9.)
(13) Slide mist eliminator straight down into guides. Be sure that TOP marking is up and that air flow
arrow points out away from evaporator coil and unit.
(14) Install evaporator fan. (See para 4-63.)
(15) Evacuate and charge the refrigeration system. (See para 5-10 and 5-11.)
5-51
