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7.5
MCB
•
Disconnect electrical supply.
•
Remove front panel (below burner)
The MCB is located on the electrical panel plate situated on
the right hand side of the unit.
•
Disconnect the two cables from the MCB noting
which cables are connected to which terminals
•
The MCB is attached to a DIN rail using a spring
loaded din fixing clip - using a small flat head screwdriver,
prise the clip downwards to release the MCB.
•
Replace in reverse order.
7.6
Fan/Limit Stat Assembly
•
Remove the cover plate by re4moving 4 screws.
•
Loosen the cable gland then disconnect the three
cables from the fan stat (left hand) and the two cables
from the limit stat (right hand) noting which cables are
connected to which terminals.
•
Remove the two screws fixing the assembly to the
body of the heater.
•
Carefully withdraw the assembly through the hole
and replace in reverse order.
7.7
Fan Belts
Note
The maximum displacement at the mid point of the top edge
of the belt must not be greater than 16mm per metre of span,
when a force of 3kg is applied in a plane perpendicular to the
belt.
•
Disconnect electrical supply.
•
Remove front lower panel (below burner)
•
Loosen fan motor securing bolts on chassis.
•
Loosen fan motor slide adjustment bolt.
•
Slide fan towards fan to slacken belts.
•
Replace belts, pull fan motor away from fan until belts
are tight.
•
Tighten adjustment bolt to hold motor.
•
Tighten fan securing bolts ensuring that the fan is
square and the pulleys aligned.
•
Check belt tension, making final adjustments as
necessary.
•
Tighten and clamp fasteners to hold fan motor in
position.
7.8
Blower Motor
•
Disconnect electrical supply.
•
Remove front lower panel (below burner) and side
lower panel for ease of access.
•
Loosen fan motor securing bolts on chassis.
•
Loosen fan motor slide adjustment bolt.
•
Slide motor towards fan to slacken belts and remove.
•
Remove the four bolts and nuts securing the motor
feet to the motor slide and withdraw motor for ease.
•
Remove the motor electrical box cover by removing
four screws
•
Disconnect the electrical cables to the motor
connections noting which cables to which terminals.
•
Unscrew the cable gland on the side of the electrical
box and withdraw the motor cables.
•
Replace in reverse order.
7.9
Fan Blower
The fan blower is removed form the rear of the cabinet heater
(opposing side to burner). Ensure there is enough room to
work in and to withdraw the fan blower.
•
Disconnect electrical supply.
•
Remove all lower panels.
•
Loosen fan motor securing bolts on chassis.
•
Loosen fan motor slide adjustment bolt.
•
Slide motor towards fan to slacken belts and remove.
•
Remove the two bolts fixing the painted rear lower
edge tidy plate from the chassis and remove plate.
•
Remove the six screws fixing the rear air deflection
shield (three on the right, three on the left) two of which
screw into the centre diaphragm plate and two each
which screw into the side deflection shields.
•
Remove the four bolts fixing the fan feet to the base
plate.
•
Withdraw the fan blower by sliding it out from the
rear.
•
Remove pulley assembly
•
Replace in reverse order
Doc No. 20-45-159 Page 59 of 60
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