HAND VALVES

TM5-4110-234-14

TO 40R7-5-7-1

(5)

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

(6)

Close all access doors.

5-15.

HAND VALVES See figure 5-5 or 5-6.

The refrigeration system has three hand shut-off valves: a hot gas shut off valve, a drier bypass valve, and a drier

service valve. The same replacement procedure is used for any of these valves.

a. Removal.

(1)

Open the appropriate access door.

(2)

Pump down the system (para 5-6).

(3)

Connect a dry nitrogen source to the compressor discharge service tee.

(4)

For the hot gas shut off valve disconnect the flare nut on the inlet of the strainer in the hot gas bypass

line.

(5)

For either drier valves disconnect the flare nut on the receiver inlet line.

(6)

Debraze the tubes to the valve. (para 5-12).

(7)

Remove the attaching hardware and remove the valve.

Install.

(1)

Secure the valve with appropriate mounting hardware.

(2)

Braze the tubing in place.

(3)

Connect flare nut that was disconnected for nitrogen purging and remove nitrogen source.

(4)

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

(5)

Leak test the valve, the newly connected tubing connections and the tubing connections in the area of

the newly brazed joints per paragraph 5-7.

(6)

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

(7)

Close all access doors.

5-16.

REFRIGERANT STRAINER See figure 5-5 or 5-6.

Remove.

(1)

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

(2)

Open the lower left front access door.

(3)

Disconnect the flare nuts and remove the strainer.

Install.

(1)

Place the strainer in the unit. Check to see that the flow arrow is pointing away from the hand valve.

(2)

Tighten the flare nuts.

5-16