Replace hot gas valve (1, FIGURE 4-6) as follows:

TM 55-1905-223-24-17

WARNING

Make sure the refrigerant charge has been removed from system before opening

line to replace valve.

(1) Remove charge from system (paragraph 4-10).

(2) Disconnect hot gas valve (1) at brazed connections (5) and (6) and remove valve from line.

(3) Braze new hot gas valve (1) in line at connections (6) and (5).

(4) Open service valves and receiver outlet valve to allow refrigerant back into system (paragraph 4-

10).

(5) Restore electrical power and run the air conditioner to check for proper operation. Check refrigerant

sight glass and add R-22 refrigerant as required (paragraph 4-10).

NOTE

The hot gas valve (1) is factory pre-set to open at 53 psi.

(6) Remove "Out of Service" tag from circuit.

d. Replace liquid line valve in the liquid line portion of high side piping on

A/C-2 (1, FIGURE 4-7) as follows:

WARNING

PRESSURIZED GAS HAZARD. Make sure the system has been pumped down

and lines purged or residual refrigerant charge. (Item 10, Table 4-1).

(1) Tag and disconnect electrical wiring to liquid line valve (1) in the liquid line portion of high side piping

on A/C-2.

(2) Disconnect valve at fitting (3) and at brazed connections (2) and (4) and remove valve (1).

(3) Braze new liquid line valve (1) at connections (2) and (4). Connect fitting (3).

(4) Connect electrical wiring to liquid line valve (1) terminals.

(5) Evacuate and re-charge system with R-22 (paragraph 4-10).

(6) Restore electrical power and run air conditioner to check for operation. Check refrigerant sight glass

and add R-22 refrigerant as required (paragraph 4-10).

(7) Remove "Out of Service" tag from circuit.

4-33