TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 48 of 1258
TM 9-2320-280-34
Change 1
2 - 2 1
AIR-CONDITIONER
1.
Insufficient cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-22
2.
Intermittent cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-23
AIR-CONDITIONER COMPRESSOR
3.
Insufficient cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-24
4.
Unusual noise with clutch engaged . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-25
5.
Unusual noise with clutch disengaged . . . . . . . . . . . . . . . . . . . . . . . . . .
2-26
6.
Incorrect oil level or leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-26
A
I R - C O N D
I T
I O N
I N G
TROUBLESHOOTING SYMPTOM INDEX
* Information not available
TROUBLESHOOTING
MALFUNCTION
AIR-CONDITIONING
PROCEDURE
NO.
MALFUNCTION
PAGE
Table 2-2. Normal Operating Temperatures and Pressures (R-12).
Relative
Surrounding
Engine
Desirable Center
Low Side
High Side
Humidity
Air Temperature
Speed
Outlet Discharge
Pressure
Pressure
(percent)
°F (°C)
(rpm)
Air Temperature
psi (kPa)
psi (kPa)
°F (°C)
±5 psi (±34 kPa)
±25 psi (±172 kPa)
70 (21)
40 ( 4)
11 ( 76)
177 (1220)
20
80 (26)
1500
42 ( 6)
17 (117)
208 (1434)
90 (32)
44 ( 7)
22 (152)
226 (1558)
100 (37)
45 ( 7)
25 (172)
255 (1758)
70 (21)
42 ( 6)
13 ( 89)
181 (1247)
30
80 (26)
1500
43 ( 6)
18 (124)
208 (1544)
90 (32)
45 ( 7)
24 (165)
234 (1613)
100 (37)
46 ( 9)
28 (193)
267 (1840)
70 (21)
42 ( 6)
14 ( 96)
185 (1275)
40
80 (26)
1500
44 ( 7)
20 (138)
220 (1517)
90 (32)
46 ( 8)
26 (179)
243 (1675)
100 (37)
48 ( 9)
30 (207)
278 (1917)
70 (21)
44 ( 7)
14 ( 96)
189 (1303)
50
80 (26)
1500
46 ( 8)
22 (152)
226 (1558)
90 (32)
50 (10)
26 (179)
251 (1730)
100 (37)
52 (11)
30 (207)
289 (1992)
70 (21)
44 ( 7)
16 (110)
193 (1331)
60
80 (26)
1500
50 (10)
24 (165)
233 (1606)
90 (32)
52 (11)
28 (193)
259 (1786)
100 (37)
54 (12)
32 (221)
300 (2068)
70 (21)
46 ( 8)
18 (124)
198 (1365)
70
80 (26)
1500
50 (10)
24 (165)
238 (1641)
90 (32)
54 (12)
30 (207)
267 (1840)
100 (37)
58 (14)
32 (221)
312 (2151)
70 (21)
50 (10)
22 (152)
202 (1393)
80
80 (26)
1500
56 (13)
26 (179)
244 (1682)
90 (32)
60 (16)
32 (221)
277 (1910)
100 (37)
*
*
*
70 (21)
60 (16)
24 (165)
206 (1420)
90
80 (26)
1500
64 (18)
34 (234)
250 (1724)
90 (32)
70 (21)
44 (303)
284 (1958)
100 (37)
*
*
*
NOTE
Table 2-2 applies to air-conditioning systems serviced with R-12
refrigerant only.
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