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 TM 55-1905-223-24-17
(3)
Install a new control contactor (7).
(4)
Connect electrical wiring to control contactor terminals.
c.
Replace power transformer (6):
(1)
Tag and disconnect electrical wiring at power transformer (6).
(2)
Remove power transformer (6) from terminal box (3).
(3)
Install new power transformer (6).
(4)
Connect electrical wiring to power transformer terminals (6).
d.
Replace manual limit capillary reset (4) and/or automatic limit capillary reset (5):
(1)
Tag and disconnect electrical wiring from appropriate reset (4) or (5).
(2)
Remove reset (4) or (5) from terminal box (3).
(3)
Install new reset (4) or (5).
(4)
Connect electrical wiring to manual limit capillary reset (4) and/or automatic limit capillary
reset (5).
e.
Replace airflow switch (1) and air probe (2):
(1)
Tag and disconnect electrical wiring to switch (1).
(2)
Disconnect air probe (2) from airflow switch (1).
(3)
Remove airflow switch and air probe from heater (3).
(4)
Install new air probe (2) and airflow switch (1).
(5)
Connect air probe (2) to airflow switch (1).
(6)
Connect electrical wiring to terminals on airflow switch (1).
f.
Close terminal box door (8).
g.
Operational check:
(1)
Turn electrical power ON.
(2)
Start and run heater to check for proper operation.
(3)
Remove "Out of Service" tag from circuit.
3-23
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