MOISTURE INDICATING REFRIGERANT SIGHT GLASS

TM5-4110-234-14

TO 40R7-5-7-1

5-21. MOISTURE INDICATING REFRIGERANT SIGHT GLASS See figure 2-3 for functional description and figure 5-5

or 5-6 for location and removal.

Removal.

(1)

Pump the system down in accordance with paragraph 5-6.

(2) Connect a dry nitrogen source to the compressor discharge service tee and loosen the flare nut to the

receiver inlet valve. Purge this section of tubing in accordance with paragraph 5-9.

(3)

Debraze (see para 5-12) the tubes to the sight glass and remove the sight glass.

Installation.

(1) Braze (see para 5-12) the tubes to the sight glass.

(2) Tighten the flare nut to the receiver inlet valve and remove the nitrogen source.

(3) Replace the drier (see para 5-19).

(4) Leak test the sight glass area per paragraph 5-7.

(5) Evacuate and charge the system as directed in paragraphs 5-10 and 5-11a.

(6) Close all access doors.

5-22.

EXPANSION VALVE See figures 5-5 and 5-7 for location.

Access. Remove the evaporator air housing and screen. (See figure 4-12.)

b. Adjust. (See figure 58.) The expansion valve, as supplied with the unit, is preset at the factory. This valve

should not be adjusted unnecessarily. When a new valve is installed or adjustment is necessary, see the following

instructions:

Figure 5-8. Expansion Valve

5-21