Refrigerant System (page 3 of 9)

AIR CONDITIONING

82-8

DESCRIPTION AND OPERATION

Sectioned View of Compressor

A = Inlet pressure; B = Outlet pressure; C = Servo pressure; D = Ambient air pressure

1 Clutch and pulley assembly
2 Shaft
3 Guide pin
4 Outlet port
5 Inlet port
6 Control valve assembly
7 Ball valve

8 Push rod
9 Diaphragm

10 Suction valve
11 Discharge valve
12 Piston
13 Swash plate
14 Lug plate

The compressor consists of a housing which contains a shaft mounted in radial and thrust bearings. A lug plate is 
pressed onto the shaft and the clutch and pulley assembly is splined to the end of the shaft at the front of the housing. 
A swash plate is installed on the shaft and connected to the lug plate by two guide pins. The swash plate is a sliding 
fit on the shaft and biased away from the lug plate by a spring. The outer circumference of the swash plate is engaged 
in the ends of seven pistons, which are located in cylinders equally spaced around the housing interior. Two pressure 
chambers in the rear of the housing are connected to inlet and outlet ports in the housing wall. Suction and discharge 
valves, between each cylinder and the chambers, control the flow of vapour into and out of the cylinders. A control 
valve assembly regulates a servo (control) pressure supplied through drillings in the housing of the chamber 
containing the swash plate.

M82 0713

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1

2

3

4

5

6

7

8

9

11

12

13

14

D

A

C

B