TM9-4120-400-14
4-24. MODE SELECTOR SWITCH S1. - continued
TESTING
See the mode position chart below and check continuity at pins indicated to each of the positions indicated.
Replace the switch if continuities are not in accordance with those indicated.
MODE POSITION CHART
Position
Function
Switch Section and Terminals Connected
S1 A
S1 B
S1 C
S1 D
1
HEAT (HIGH)
12 and 1A
21 and 2C
31 and 3C
41 and 4C
22 and 2B
42 and 4A
32 and 3A
-
2
HEAT (LOW)
12 and 1A
21 and 2C
31 and 3C
22 and 2B
-
3
OFF
-
-
-
VENT
-
4
21 and 2C
31 and 3C
-
22 and 2B
5
COOL
12 and 1B
21 and 2C
31 and 3C
-
11 and 1D
22 and 2B
REPLACEMENT
Replace MODE SELECTOR switch if defective.
INSTALLATION
1. Slip MODE SELECTOR switch shaft through panel (13) and secure with mounting nut (11) and washer (12)
supplied with switch.
Place knob (10) on MODE SELECTOR switch shaft and tighten setscrew (9).
2.
3.
See tags and wiring diagram (fig. 4-4) and connect wire leads. Remove tags.
4.
Check that grommets (14) are in place in shaft holes.
5.
Slip back plate (7) in place and align holes in back plate with the three posts (6). Check that grommets (14) are
still in place in shaft holes. Secure with three self-locking screws (5).
Install TEMPERATURE SELECTOR knob (4) and tighten setscrew (3).
6.
7.
Slip cover (2) in place and secure with four screws (1).
NOTE
FOLLOW-ON MAINTENANCE:
Install control module (para 4-21).
4-68
