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c. Cleaning and Inspection. Wipe off any ac-
cumulation of dust and test as described below.
( 1 ) Test for continuity between contacts 1 and
2 and also between contacts 3 and 4. Contacts
should open on temperature rise at 150°F + 5 %F
and close on temperature drop at 110°F + 10 %F.
(2) Replace switch if it fails to meet test
requirements.
d. Installation. Refer to figure 4-9 and install
heater thermostatic switch.
( 1 ) Refer to wiring diagram and connect leads
(6) to switch (7) with screw (5).
( 2 ) Attach switch to bracket (4) with screws
(2) and lock washers (3).
( 3 ) Secure bracket to center cover with two
screws (1 ),
(4) Refer to paragraph 4-21 and install
housing front cover.
4-35. Heater Elements
a. General. The single phase air conditioners are
equipped with four heater elements and the three
phase air conditioners are equipped with six heater
elernents. The 115 volt single phase and 230 volt
single phase heating elements are the same but
pairs of the elements are connected in parallel
circuits on the 115 volt units and in series in the
230 volt units.
b. Removal. Refer to figure 4-10 and remove
heater elements as follows:
( 1 ) Refer to paragraph 4-21 and remove
housing cover.
(2) Disconnect leads from heaters.
(3) Remove two screws, washers, and lock
washers that secure heater support to housing. Slide
support from ends of heater elements.
(4) Remove heater element nut, lock washer
and flat washer from each heater in turn and slide
heater from bracket.
4-18
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