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CONTROLS
WARNING: Installation, adjustment and service of
heater controls including timing of various operating
functions must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, heater malfunction,
property damage, personal injury, or death.
WARNING: Turn off the power to the heater before
installation, adjustment or service of the heater
controls. Failure to do so may result in heater
malfunction, property damage, personal injury, or
death.
CAUTION: This appliance has provisions to be
connected to more than one (1) supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock. More than one
(1) disconnect switch may be required to de-
energize the equipment before servicing.
Ignition Control Module
The interrupted proved ignition device conserves ener-
gy. When additional heat is needed, the combustion air
blower starts to purge all air from the combustion
chamber for about 15 seconds. On proof of air flow,
the air proving switch closes and the igniter is ener-
gized, eliminating the fuel costs of maintaining a
constant pilot.
To ensure safe operation, the gas valve cannot open
until the pilot igniter is verified. The 100% igniter safe-
ty is an electronic device which closes the main gas
valve within 8/10 of a second whenever the flame is
interrupted. Main burner is automatically lit when the
device is powered and pre-purged. Unit performs its
own safety check and opens the main valve only after
the igniter is proven to be capable of ignition.
Fig. 22: Ignition Module
High Limit (Manual Reset)
The heater is equipped with a manual reset high limit
temperature device. Push the reset button and adjust
the setting to 30° F or 40° F above desired operating
temperature.
Fig. 23: Manual Reset High Limit
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