Carrier 07E User Manual

Page 11

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PRESSURE DIFFERENTIAL

SEALING

BYPASS CYLINDER

-BYPASS PASSAGE

COMMUNICATES WITH

'SUCTION MANIFOLD

-SUCTION MANIFOLD

I DISCHARGE PRESSURE

LOADED OPERATION

Fig. 16 — Capacity Control Valve Operation

BYPASS PISTON PLUG

SPRING —^

CAPSCREWS

(NON INTERCHANGEABLE

WITH CONTROL VALVE

CAP SCREWS)

CAP SCREWS

(NONINTERCHANGEABLE

WITH FLANGE COVER

CAP SCREWS)

Fig. 17 — Removal of Capacity Control Valve

cap screws hold piston plug assembly in place.
Remove flange cover, spring, piston plug and seat

ring (Fig. 18). A tapped hole is provided in piston

to allow it to be pulled out. Hole has same thread
diameter as cap screws removed above.

-SEAT RING . .

FLANGE COVER

Fig. 18 — Removal of Bypass Piston Plug

SUCTION AND DISCHARGE VALVE

PLATE ASSEMBLY (Fig. 12)

Test

for leaking discharge valves by pumping

compressor down and observing suction and

discharge pressure equalization. If a discharge valve
is leaking their pressures will equalize rapidly.
Maximum allowable discharge pressure drop is 3
psi per minute.