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AIR CONDITIONING
24-29
HEATER THERMOSTAT AT
V A C U U M CAMBRATION CHART
MID-POSITION
Degrees Fahrenheit
Vacuum Range
65
66
67
68
69
70
7 1
72
73
74
75
76
77
78
79
80
8 1
82
83
84
85
7.75-9.50
7.75-9.50
7.50-9.50
7.50-9.50
7.50-9.25
7.50-9.25
7.25-9.00
7.25-9.00
7.25-9.00
7.00-9.00
7.00-8.75
7.00-8.75
6.75-8.50
6.75-8.50
6.75-8.50
6.50-8.50
6.50-8.25
6.50-8.25
6.25-8.00
6.25-8.00
6.25-8.00
AIR CONDITIONING THERMOSTAT
CALIBRATION CHART
MID-POSITION V A C U U M
Degrees Fahrenheit
Vacuum Range
65
66
67
68
69
70
7 1
72
73
74
75
76
77
78
79
80
8 1
82
83
84
85
5.25-7.00
5.25-7.00
5.00-7.00
5.00-7.00
5.00-6.75
5.00-6.75
4.75-6.50
4.75-6.50
4.75-6.50
4.50-6.50
4.50-6.25
4.50-6.25
4.25-6.00
4.25-6.00
4.25-6.00
4.00-6.00
4.00-5.75
4.00-5.75
4.00-5.75
3.75-5.50
3.75-5.50
connecting the two cam levers to keep
it
from mov-
ing during shipping. When you attach the vacuum
source hoses to the stats, be sure the temperature con-
trol cable is routed between the hose and the evap-
orator housing. If it's the other way around, with the
cable over the hose, there's a good chance that the
hose will be pinched, affecting the temperature con-
trol system. After the stats are installed, remember to
LEAD WIRE
\--
HUB AND SHOE ASSEMBLY
HUB SNAP R&\
PULLEY ASSEMBLY
61
x32
.-
Fig. 3 6 - M a g n e t i c Clutch-Stationary
Field Type
u y p i c a i j
adjust the temperature control cable as described ear-
lier.
MAGNETIC CLUTCH
The magnetic clutch (Fig. 36) uses a stationary elec-
tromagnet attached to the compressor. Since the elec-
tromagnet does not rotate, the collector rings and the
brushes are eliminated.
Testing Electromagnet Current Draw
To test the coil for a short or open circuit, connect
an ammeter
(0-10
ampere scale) in series with a fully
charged 12-volt battery and the field coil lead. The
current draw should be 2.7 to 3.3 amperes at
12
volts at 68" temperature.
Removal
(1)
Loosen and remove the belts. Disconnect the
field coil lead wire.
(2) Remove the special locking bolt and the washer
from the compressor crankshaft at the front center of
the clutch.
(3)
Insert a cap screw into the threaded portion of
the hub and shoe assembly.
(4)
Support the clutch with one hand, then tighten
the cap screw until the clutch is removed.
(5) Remove the three hex field coil assembly mount-
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