3-90-00674R20_08/12
The is a differen-
tial pressure switch that monitors the negative pres-
sure (Draft) in the rebox. If the draft becomes too
low for proper combustion, the switch opens, cutting
power to the feed motor and the igniter circuits. This
switch is connected into the AC (high voltage) wiring.
The combination is re-
sponsible for all high limit safety control. There are
2 high limits, one normal operation high limit and
one backup high limit. The control has an automatic
diagnostic circuit that continuously monitors the ESP
and Room Sensor for faults. If a fault should occur,
the control sends a status alert and at the same time
the unit goes down to minimum feed/minimum burn
as a safety condition.
Always check to see if the damper
plate swings freely inward and that
the seating edges are not covered
with dirt or lint.
Low Draft
Pressure
Switch
Feed Motor
Combustion Motor
Distribution Blower
(under unit)
See Fig. 10, Page 9.
Silicone
sponge
docking
gasket
The is found in
the rear corner of the hopper opening. If the hopper
lid is not fully closed, the switch opens, interrupting
the power to the feed motor and the igniter circuits.
This prevents possible injury from reaching into the
feeder mechanism during operation.
Hopper Lid
Position
Switch
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