Chevrolet Light Duty Truck 1973 Service Manual page 74

1A-48 HEATER A N D AIR C O N D IT IO N IN G
the passenger area and resulting in insuffi­
cient or no cooling.
PERFORMANCE DATA
The following Performance Data define normal opera­
tion of the system under the above conditions. Relative
humidity does not appear in the tables because after
running the prescribed length of time on recirculated air
and maximum cooling, the relative humidity of the air
passing over the evaporator core will remain at
approximately 35% to 40% regardless of the ambient
temperature or humidity.
Four-Season Air Conditioning (C-K Models)
(Refrigerant Charge - 3 Lbs.)
Temperature of
Air Entering
70°
Condenser
Engine rpm
Compressor Head
150-
Pressure * 205
Accumulator 20-
Pressure *
26
Discharge Air
41-
Temp, at Right
47
Hand Outlet *
Overhead System (C-K Models)
(Refrigerant Charge - 5 lbs.-4 oz.)
Temperature of
Air Entering
70°
Condenser
Engine rpm
Compressor
135-
Head
185
Pressure *
Accumulator 22-
Pressure * 28
Discharge Air
42-
Temp, at Right
48
Hand Outlet *
Rear Center
43-
Outlet * 49
80°
90° 100° 110°
2000
170- 190-
220- 240-
220 240 270 290
20- 21- 22- 23-
28
29 30 32
41- 42- 43- 43-
47 50 51 51
80° 90° 100° 110°
2000
160-
195- 230- 270-
210 245
280 320
22- 30- 33-
37-
30
38 41 47
42- 50- 54-
57-
48 58 62
67
47- 50- 55-
58-
53 58 63 68
Floor Mounted System (G Models)
(Refrigerant Charge — 3 lbs.-4 oz.)
Temperature of
Air Entering 70° 80°
Condenser
Engine rpm
Compressor
130- 150-
Head Pressure*
145 165
Suction 8-
Pressure* 10
Discharge Air
41-
Temp, at Right
44
Upper Outlet*
Overhead System (G Models)
(Refrigerant Charge — 5 lbs.-4 oz.
Temperature of
Air Entering
Condenser
Engine rpm
Compressor 165- 175- 210- 230
Head Pressure* 180 190
Suction 12-
14-
Pressure*
15 17
Discharge Air
Temp, at Right
40- 41-
Front Upper
43 44
Outlet*
Dash Mounted Unit (Motor Home Chassis)
(Refrigerant Charge — 3 lbs.-4 oz.)
Temperature of
Air Entering
70° 80°
Condenser
Engine rpm
Compressor
110- 135-
Head Pressure*
120 145
Suction
6
Pressure psi*
Discharge Air
40- 41-
Temperature*
45 46
* Just prior to compressor clutch disengagement.
90° 100° 110° 120°
2000 RPM
ISO- 205- 240-
160-
175 195 220 255
11-
8- 8- 8-
10 10 10 14
41- 42- 45- 50-
44 45 48 53
90° 100° 110° 120°
2000
265- 305-
225 245
280 320
16- 20- 26-
19 23 29
45- 52- 60-
48 55 63
90° 100° 110° 120°
2000
160- 190-
220- 260-
170 200
230 270
7 9 10 10 13
41-
42- 44- 44-
46 47
49 49
LIGHT DUTY TRUCK SERVICE MANUAL
12-
15
55-
58
31-
34
65-
68