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 TM 9-4120-430-14
0026 00
Temperature Selector Switch S2(15) (Refer to Exploded View Figure 3)
1. Turn mode selector switch S1(10) to OFF position.
2. Check for continuity using a multimeter on the lowest ohm setting. Place probes on the connector pins 1 and 12 of
connector P3. Continuity should be indicated.
3. Turn switch to COOLER (fully counterclockwise). No continuity should exist.
NOTE
Switch operates in temperature range of 90 degrees F to 60 degrees F (32.2 degrees C to 15.5
degrees C).
4. Turn switch to WARMER (fully clockwise). Meter should show continuity as setting becomes higher than bulb
temperature.
Mode Selector Switch S1(12) (Refer to Exploded View Figure 3 and Table 1)
1. Ensure temperature selector switch (S2) (15) is in WARMER position.
2. Check continuity of mode selector switch S1 as follows:
a)
Switch in OFF position. No continuity should be indicated between connector pins 3 and 7; 5 and 8; or 6 and 1.
b)
Switch in VENT position. Continuity should be indicated between connector pins 3 and 7.
c)
Switch in HEAT position. Continuity should be indicated between connector pins 5 and 8.
d)
Switch in COOL position. Continuity should be indicated between connector pins 6 and 1.
3. Replace if switch fails test.
Table 1. Switch Selection and Terminals
MODE SELECTOR SWITCH
SWITCH SELECTION AND TERMINALS CONNECTED
POSITION
FUNCTION
S1A
S1B
S1C
1
OFF
-----
-----
-----
2
VENT
A AND B
-----
-----
3
HEAT
A AND B
E AND D
-----
4
COOL
A AND B
-----
C AND F
0026 00-3
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