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 TM 55-1905-223-24-17
REPAIR
WARNING
Turn electrical power to OFF to avoid personal injury.
a.
Turn electrical power to heater OFF and open terminal box doors (5, 7).
b.
Replace control contactors (3) and/or (4):
(1)
Tag and disconnect electrical wiring from appropriate contactor(s).
(2)
Remove contactor (3) and/or (4) from terminal box.
(3)
Install a new contactor (3) and/or (4).
(4)
Connect electrical wiring to contactor terminals.
c.
Replace control transformer (6).
(1)
Tag and disconnect electrical wiring from transformer.
(2)
Remove transformer from terminal box.
(3)
Install new control transformer (6).
(4)
Connect electrical wiring to transformer terminals.
d.
Replace thermostatic switches (3, 4, 5, FIGURE 3-2):
(1)
Remove duct heater (removal step in this procedure).
(2)
Replace appropriate thermostatic switch in the heater (2) element box (1):
(a)
Tag and disconnect electrical wiring from appropriate switch.
(b)
Remove appropriate switch (3, 4, or 5) from element box (1).
(c)
Install new thermostatic switch (3, 4, or 5).
(d)
Connect electrical wires to switch terminals.
e.
Close terminal box doors (5, 7, FIGURE 3-1).
3-18
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