EXPANSION VALVE (PRIMARY).

TM5-4120-383-14

EVAPORATOR

COIL.-Continued

520.

(6) Rewrap insulation that was removed prior to debrazing.

(7) Slide mist eliminator into its holder. TOP mark must be

up and air flow arrows must point away from coil.

(8) Install supply air louver and top front cover.

(9) Evacuate and charge refrigeration system in accordance

EXPANSION VALVE (PRIMARY).

The (primary) expansion valve is factory set at a superheat of

Do not

6 1/2F (3.3 0.3C) at 32F (0C) bath temperature.

attempt field adjustment of the valve.

Removal.

(1) Disconnect power at power source.

(2) Remove top front cover (para 4-11).

(3) Discharge and purge refrigeration system per paragraphs

5-11 and 5-12.

(4) Unwrap insulation from joints of expansion valve.

(5) Soften thermal mastic in the bulb well using a cloth

wrung out in hot water, a heat lamp, or heat gun if necessary and

withdraw bulb from bulb well.

(6) Debraze three tube connections to valve.

(7) Remove valve from unit.

Replace.

If expansion valve is suspected bad replace it.

Installation.

(1) Place expansion valve in unit and align tubing ends.

(2) Protect valve from overheating during brazing operations.

Direct flame away from valve body and wrap valve body with wet

rags.

(3) Braze joints in accordance with paragraph 5-13.

5-48