Limit (Overheat Safety) Switch And Cycling Switch Removal And Installation - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
13-33. LIMIT (OVERHEAT SAFETY) SWITCH AND CYCLING SWITCH. (Refer to Figure 13-17.)
a. Removal.
1. If the limit switch (8) is damaged or defective, disconnect the two electrical leads from the
switch terminals. Be sure to mark the leads for proper reassembly. (The switch terminals are identified by
numbers "1" and "2.")
2.
Remove the two attaching screws and lift the limit switch (8) and spacers (gaskets) from the
jacket opening.
3.
If the cycling switch (1 1) is damaged or defective, disconnect the electrical leads, being sure
to mark them for proper reassembly.
4. Remove the two screws and lift the cycling switch (11) from the jacket opening.
NOTE
No attempt should be made to repair either of these switches. If they
do not operate properly, they should be replaced. (Refer to
Paragraph 13-50, m and n for test instructions.)
b. Installation.
1.
Install the limit switch (8) and two spacers (gaskets) by placing them in position in the
heater jacket opening and installing two screws.
2. Tighten screws securely; then reconnect the electrical leads in accordance with markings made
during disassembly. (If in doubt about electrical connections, refer to the wiring diagram, Figure 13-6.)
3. Install the cycling switch (11) by placing it in position in the heaterjacket opening and securing it
with the two screws. Tighten screws securely; then reconnect the electrical leads to their respective terminals as
marked during disassembly. (If in doubt about connections, refer to wiring diagram, Figure 13-6.)
NOTE
The cycling switch shuts off the heater at 250
°
F. It will then
reset itself when the temperature falls below this point. The
overheat switch operates at 300-400
°
F.
Reissued: 9/23/80
HEATING AND VENTILATING SYSTEM
4C3