The is a differential
pressure switch that senses the negative pressure
(draft) in the rebox. If the draft becomes too low for
proper combustion, the switch opens, interrupting
power to the feed motor and the igniter. This switch is
connected into the AC (high voltage) wires.
The is located in
the rear corner of the hopper opening. If the hopper
lid is not closed properly, the switch opens, interrupt-
ing power to the feed motor and igniter circuits. This
is to protect against reaching into the feed mechanism
while in operation.
The combination is respon-
sible 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 cir-
cuit that continuously monitors the ESP and Room Sen-
sor 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.
Low Draft
Pressure
Switch
Combustion Air
Intake Backdraft
Damper
Combustion Blower
Igniter Wire
- Feeder Entry
Location
Feed motor
Hopper Lid
Position
Switch
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