EXPANSION VALVE REPLACEMENT (Continued)

TM 5-4120-359-14

CAUTION

Use care to not damage or kink the capillary.

(5) Note exact position of expansion valve on refrigerant line.

(6) Wrap wet rags around expansion valve body and distributor tubes.

(7) Using torch debraze and separate the distributor, elbow and equalizer line tubing from the expansion valve.

(8) Remove expansion valve.

d. Reassembly/Installation

(1) Tubing should be nitrogen purged during all brazing/debrazing operations.

(2) Clean and prepare distributor, tubing and elbow prior t installing new expansion valve. (See paragraph 4-7.)

(3) Slip expansion valve in place in original position and check that fittings and tubing fit properly into expansion

valve solder cups.

(4) Wrap wet rags around expansion valve body and distributor tubes.

(5) Using torch braze the three expansion valve joints in accordance with paragraph 4-7.

(6) Slip the sensing bulb into its mounting bulb straps. Be sure the bulb is on the top of the suction line in original

position and tighten the two nuts and screws. Be sure the sensing bulb is making good metal-to-metal contact with the

suction line.

(7) Replace the insulation tape that was removed from the sensing bulb and expansion valve connections. Use

insulation tape, item 14, Appendix E. Apply in spiral with overlapping edges.

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.)

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