|
| |
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) Attach switch to bracket with two screws
and lock washers.
(2) Secure bracket to center cover with two
screws.
(3) Refer to wiring diagram and connect leads
to switch with switch screws.
(4) Refer to paragraph 4-21 and install
housing front cover.
4-35. Heater Element
a. General. The single phase air conditioners are
equipped with six 230 volt heater elements and the
three phase air conditioners are equipped with six
120 volt heater elements.
b. Removal. Refer to figure 4-10 and remove
heater elements as follows:
(1) Refer to paragraph 4-21 and remove
housing covers.
(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.
Figure 4-10. Heater elements and support.
4-19
|
