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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
SPECIFICATIONS (Continued)
OPERATING PRESSURE TEST CHART
A properly charged and functioning air conditioning system should indicate the readings shown below with the engine
operating at the speed shown in ENGINE SPEED CHART, blower on "HIGH" speed, control lever on "COLD" and
both cab doors open.
RELATIVE HUMIDITY BELOW 30%
Ambient
Average Compressor
Passenger Inboard
Temperature
Refrigerant Pressures
Outlet Air
C
(F)
Temperature
HEAD
SUCTION
C
(F)
20
(68)*
880-1080 kPa (125-155 psi)
61-89 kPa ( 9-13 psi)
5-6
(41-43)
25
(77)*
1130-1330 kPa (160-190 psi)
67-95 kPa (10-14 psi)
5-6
(41-43)
30
(86)
1380-1580 kPa (200-230 psi)
76-104 kPa (11-15 psi)
5-6
(41-43)
35
(95)
1630-1830 kPa (235-265 psi)
104-132 kPa (15-19 psi)
7-9
(45-48)
40
(104)
1790-1890 kPa (260-290 psi)
134-162 kPa (19-23 psi)
10-13
(50-55)
RELATIVE HUMIDITY ABOVE 30%
Ambient
Average Compressor
Passenger Inboard
Temperature
Refrigerant Pressures
Outlet Air
C
(F)
Temperature
HEAD
SUCTION
C
(F)
20
(68)*
1115-1315 kPa (160-190 psi)
84-112 kPa (12-16 psi)
5-6
(41-43)
25
(77)*
1360-1560 kPa (195-225 psi)
108-136 kPa (16-20 psi)
7-9
(45-48)
30
(86)
1600-1800 kPa (230-260 psi)
132-160 kPa (19-23 psi)
11-13
(52-55)
35
(95)
1850-2050 kPa (270-300 psi)
178-206 kPa (26-30 psi)
14-17
(57-63)
40
(104)
2090-2290 kPa (300-330 psi)
236-264 kPa (34-38 psi)
18-21
(64-70
* System may cycle at these ambient temperatures. Test readings listed are those that will occur just prior to
compressor cycling off.
CTS-2731 Page 46
PRINTED IN UNITED STATES OF AMERICA
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