The is a differential pres-
sure switch that monitors the negative pressure (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 responsible 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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