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 TM 55-1905-223-24-17
c.
Replace airflow switch (1) and air probe (2):
(1)
Tag and disconnect electrical wiring to switch (1).
(2)
Disconnect air probe (2) from switch (1).
(3)
Remove mounting screws.
(4)
Remove switch and air probe from heater.
(5)
Install new air probe (2) and airflow switch (1).
(6)
Connect air probe to airflow switch.
(7)
Connect electrical wiring to proper terminal on airflow switch.
d.
Replace control contactor (in Unit 8 and Unit 11 only).
(1)
Tag and disconnect electrical wiring at control contactor (6) terminals.
(2)
Remove the control contactor (6).
(3)
Install a new control contactor (6).
(4)
Connect electrical wiring to control contactor (6) terminals.
e.
Close terminal box door (7) to heater (3).
f.
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.
3-26
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