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 (1) Deenergize circuit at power panel, tag and
close first and open last.
Shim graphite contacts to
open the switch, then remove fuses from the power supply
compensate for normal wear.
panel.
(4) Check all connections for tightness and clean
(2) Tag and disconnect all electrical connections
contact surfaces.
at the controller.
(5) Check magnet coil for overheating. If the
(3) Remove mounting screws, then lift controller
magnet coil overheats, measure resistance of the 365 ohm
from mounting.
control resistor. Replace a shorted resistor. Check magnet
coil for shorted turns. Replace a defective coil.
e. Installation.
Install by reversing the removal
procedure.
c. Adjustment of Contacts.
(1) Check that contacts are touching when the
magnet is still open 1/4 inch at top of armature.
5-74. Axial Blower Assembly
(2) When opening is less then 1/4 inch, replace
the contacts.
and axial flow type, driven by a 4 hp, 115-volt dc, 1-750 rpm
d Removal.
motor, is rated at 9,000 cfm, and mounted vertically on the
overhead of the fidley (fig. 5-113) and exhausts into the stack.
5-158
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