TM 9-4110-258-13
4.20 TOGGLE SWITCH S1 TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Equipment Conditions:
General Safety Instructions:
Refrigeration unit shut down (para 2.7) and power
disconnected.
WARNING
Control box cover door raised and latched.
High voltage and exposed rotating parts are
Materials/Parts:
used in the refrigeration unit. Personal injury
can result if power is connected.
Marker Tags (2)
7, Appendix E
a.
Testing. (See Figure 1-4.)
(1) Be sure power has been disconnected at the source and remove six bolts (1). Open control box cover (2)
(2) Using multimeter set to measure continuity, check toggle switch (3) continuity between terminals 2 to 3
with toggle switch in both START/RUN and OFF position. Continuity should be indicated only when toggle
switch is in the START/RUN position. If continuity was indicated in the OFF position or if no continuity was
indicated in the START/RUN position, replace toggle switch
(3) If no failure was indicated, close control box cover (2) and install six screws (1)
b.
Removal.
(1) Be sure power has been disconnected at the source and remove six screws (1). Open control box cover
(2)
NOTE
Terminal and mounting hardware is supplied with toggle switch
(2) Tag wire leads (4) and remove two screws (5), lock washers (6), and wire leads
(3) Remove nut (7), lock washer (8), retainer (9), and toggle switch (3)
4-42
