COMPRESSOR SERVICE VALVES

TM5-4110-234-14

TO 40R7-5-7-1

(5)

Replace the drier (see para 5-19).

(6)

Leak test, evacuate and charge the system as applicable. (See paragraphs 5-7, 5-10 and 5-11.)

5-28.

COMPRESSOR SERVICE VALVES I See figures 5-1 and 5-9 or 5-10.

a. Removal.

(1)

Pump down the refrigeration system (para 5-6).

(2)

Disconnect the gage capillary line and remove the tee.

(3)

Loosen the cap screws that attach the valve to the compressor.

(4)

Disconnect the flare nut from the inlet or outlet receiver valve as applicable. Purge the line to be debrazed.

(5)

Debraze tubing from the valve (para 5-12).

(6)

Plug the tube and compressor openings.

Installation.

(1)

Remove plugs.

(2)

Open the valve and wrap the valve in wet rags.

(3)

Braze the tubing to the valve (para 5-12).

(4)

Tighten the flare nut to the receiver valve and disconnect nitrogen purging connections.

(5) Using new valve gaskets that have been soaked in compressor lubricating oil, secure the valve to the

compressor with the cap screws.

(6)

Replace the drier (see para 5-19).

(7)

Leak test all newly connected tubing and tubing connections in the area of newly brazed joints perpara 5-7.

(8)

Evacuate and charge the system per paragraphs 5-10 and 5-11.

5-29.

COMPRESSOR CYLINDER HEADS AND VALVE PLATES I

a. Disassembly.

(1) Disassemble cylinder heads by removing cap screws and prying up on the side (between cylinder headand

valve plate) to break heads loose from valve plate. Do not hit cylinder heads to break loose.

(2)

Check cylinder heads for warping, cracks and damage to gasket surfaces. Replace if necessary.

NOTE

Prior to valve removal record original valve position.

(3)

Pry up on side of valve plate to remove plate from crankcase and expose suction valves. See figure 5-11.

5-33