TM 9-4120-407-14
Figure 3-34. MODE selector rotary switch (S1)
(b) With knob (2) in VENT position, continuity should be indicated between connector (P6) (3), pm
(c) With knob (2) in COOL position, continuity should be indicated between connector (P6) (3), pin
(d) With knob (2) in HEAT position, continuity should be indicated between connector (P6) (3), pin
(2) Replace the rotary switch (1) if the continuity indicated is not as specified.
b. Removal.
(1) Tag and disconnect wire leads (4) from rotary switch (1). See paragraph 3-19 for soldering
(2) Loosen two setscrews (5) and remove knob (2)
(3) Remove nut (6), lock washer (7), and rotary switch (1).
c. Installation.
(1) Install rotary switch (1), lock washer (7), and nut (6).
(2) Rotate rotary switch (1) shaft to fully clockwise position and install knob (2) pointing at HEAT.
Tighten two setscrews (5).
(3) Connect wire leads (4) to rotary switch (1) using tags and control panel wiring diagram Figure 3-30.
Use new sleeving insulation (8) as necessary. See paragraph 3-19 for soldering procedures. Remove
tags.
NOTE
FOLLOW-ON MAINTENANCE:
Assemble and install the control panel. See para 3-20.
3-93