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 TM5-4120-38314
421 .
CONTROL
MODULE.-Continued
Removal.
a.
(1) Disconnect power at power source.
(2) Remove eight screws and return air louver.
(3) Loosen sensing bulb clamp screws and slip sensing bulb
out of clamps.
(4) Loosen control module mounting screw and carefully pull
control module out of unit. Use care to avoid damage to sensing
line.
(5) Carefully work sensing bulb through the frame and out of
unit.
Test/Repair.
(See fig. 4-17.)
b.
(1) See paragraphs 4-22 through 4-26 for testing of
individual components.
(2) Repairs are limited to replacement of individual
components and repair of wire connections.
If the control module is damaged beyond repair,
c.
Replace.
replace with a new control module.
(See fig. 4-16.)
Installation.
d.
(1) Carefully work sensing bulb through junction box frame
and into two mounting clamps behind return air louver.
(2) Tighten clamp screws.
(3) Slip control module into the opening in junction box.
Take care not to crush or kink sensing bulb capillary line.
(4) Tighten control module mounting screw.
(5) Install return air louver and secure with eight screws.
(6) Connect power at power source.
4-62
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