Replace refrigeration ball valves (1, 5, FIGURE 4-8) as follows:

TM 55-1905-223-24-17

WARNING

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

and lines purged of residual refrigeration charge (Item 10, Table 4-1).

(1) Remove ball valves.

(a)

Disconnect ball valve (1) at brazed connections (3) and (4).

(b)

Disconnect ball valve (5) at brazed connections (8) and (9).

(c)

Remove ball valve (1) or (5) from refrigerant line.

(2) Replace ball valves.

(a)

Position new refrigeration ball valve (1) or (5) in refrigerant line.

(b)

Braze new ball valve (1) at connections (3) and (4).

(c)

Braze new ball valve (5) at connections (8) and (9).--

(3) Make sure all ball valves are in OPEN position.

(a)

Turn visual indicator stem (2) on ball valve (1) to the OPEN position.

(b)

The seal cap (7) must be removed from ball valve (5) for access to valve stem (6). Remove

cap and turn valve step to OPEN position. Install seal cap (7).

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

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

sight glass and add R-22 refrigerant as required (paragraph 4-9).

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

Replace angle valve (5, FIGURE 4-9) as follows:

WARNING

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

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

4-36