TM 5-3895-377-13&P
Table 4-2. Unit Troubleshooting - CONT.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL (CONT)
3.
GAGES DO NOT OPERATE OR OPERATE ERRATICALLY (CONT).
WARNING
Remove rings, bracelets, wristwatches, neck chains, and any other jewelry before
working around Heater. Jewelry can catch on equipment and cause injury, or may
short across an electrical circuit and cause severe burns or electrical shock.
Step 1.
Remove nut and screw and open control box panel and check for loose connections at gage and
thermostat. Tighten loose connections.
Step 2.
Remove two screws, cover, gasket, and leads from outlet body. Place sensors and thermometer in
cup of iced water. Attach positive lead of multimeter to terminal 2 and negative lead to terminal 1.
MEASURED RESISTANCE
TEMPERATURE
OHMS
TEMPERATURE
OHMS
°F
'C
32
1,000.0
0
1,000.0
33
1,002.1
1
1,003.9
34
1,004.2
2
1,007.8
35
1,006.3
3
1,011.7
36
1,008.4
4
1,015.6
37
1,010.5
5
1,019 5
38
1,012.6
6
1,023.4
39
1,014.7
7
1,027.3
40
1,016.8
8
1,031.2
41
1,018.9
9
1,035.1
42
1,021.0
10
1,039.0
Measured resistance should be 1,000 ohms at 32°F (O0C), with a change rate of 2 1 ohms per degree
Fahrenheit or 3.9 ohms per degree Celsius. If measured resistance dose not closely match, replace
temperature sensors (page 4-169).
If measured resistance matches, replace temperature gage (page 4-63).
If problem persists, replace thermostat (page 4-188).
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