Section VI. EVAPORATOR COIL

TM 5-4110-217-14

(2) Remove panel (2, fig. 3-24) at rear of

(2) Inspect expansion valve for cracks, chips,

evaporator section.

or other damage. Replace if defective.

d. Installation.

(3) Loosen screws holding expansion valve

bulb clamp to suction line and remove bulb.

(1) Secure expansion valve (27) in place with two

(4) Disconnect three flare nuts at expansion

screws.

valve (27).

(2) Place expansion valve power bulb in clamp in

(5) Remove screw (8, nut (9), lockwasher

suction line and tighten clamp screws.

(10), and clamp (7) that attach power bulb lead to

(3) Secure power bulb lead to evaporator coil (19)

evaporator coil (19).

with clamp (7), screw (8), nut (9), and lockwasher (10).

(6) Remove two screws that attach expansion

(4) Connect three flare nuts at expansion valve.

valve (27) to bracket (26) and remove expansion valve.

(5) Refer to paragraph 6-6 and purge refrigeration

system.

Cleaning and Inspection.

(6) Refer to paragraph 6-9 and test for leaks.

(1) Clean expansion valve with an approved

(7) Replace panel (2, fig. 3-24) at rear of

cleaning solvent and dry thoroughly.

evaporator section.

Section VI. EVAPORATOR COIL

(6) Evaporator may be removed as a unit.

6-20.

General

Cleaning and Inspection.

The evaporator coil consists of an aluminum

(1) Use stiff brush or compressed air to

housing containing a series of parallel tubes equipped

remove dust or other foreign matter from between fins of

with external radiator type fins. Liquid refrigerant enters

evaporator coil. If compressed air is used, force air

the evaporator and vaporizes as it passes through the

through fins in a direction opposite from normal

tubes. The low temperature produced by the vaporizing

circulation.

refrigerant cools the evaporator coils and the air

(2) Clean external surfaces with an approved

surrounding the coils. Air is recirculated over the coils

cleaning solvent and dry thoroughly.

through the refrigerator by means of a fan located

(3) Inspect evaporator for bent fins.

between the evaporator and the forward plate of the

Straighten fins as necessary to permit free passage of

evaporator housing.

The vaporized refrigerant is

air.

collected in a header and carried back to the compressor

(4) Repair leaks in evaporator tubing by

by the suction line.

brazing or soldering with a compound having a melting

point of more than 1000F. Use flux sparingly.

6-21.

Evaporator Coil.

c. Installation.

(1) Place evaporator coil (19) into the

Removal (fig. 6-S).

refrigeration unit as in original configuration and attach

(1) Refer to paragraph 6-1 and pump down

with six screws & washers (20 & 21).

the refrigeration system.

(2) Resweat refrigerant lines to evaporator

(2) Remove 14 screws (5, fig. 3-24) along

coil.

back panel (2, fig. 3-24) of evaporator.

(3) Attach bulbs to evaporator grille bracket

(3) Remove bulbs from the evaporator grille

(35).

bracket (35).

(4) Install back panel (2, fig. 3-24) with 14

(4) Unsweat refrigerant lines to evaporator

screws.

coil.

(5) Refer to paragraph 6-6 and purge

(5) Remove screws (20) and washers (21),

refrigeration system.

along

(6) Refer to paragraph 6-9 and test for leaks.

both

side

plates

evaporator.

6-12