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Controls
WARNING: Installation, adjustment and service of
controls, including timing of various operating func-
tions, must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, malfunction, property
damage, personal injury, or death.
WARNING: Turn off the power to the boiler before
installation, adjustment or service of any controls.
Failure to do so may result in board damage,
malfunction, property damage, personal injury, or
death.
CAUTION: This appliance has provisions to be
connected to more than one supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock: More than one
disconnect switch may be required to de-energize
the equipment before servicing.
Ignition Control Functions
When there is a call for heat, the combustion air blow-
er starts to purge air from the combustion chamber.
After the pre-purge, the igniter is energized. The stan-
dard ignition module will lock out after failing to light
four times or after losing flame three times during a
single heat demand. To reset it, press and release the
ESC/RESET button located on the user interface. The
control will automatically reset after 1 hour. When in
lock out, the control will run the blower for a 1 minute
purge cycle. Turning off the power to the heater
WILL NOT reset the ignition module.
The optional single-try ignition module will attempt to
light only one time before locking out. To reset it, press
the ESC/RESET button on the user interface.
High Limit — Manual Reset
This boiler is equipped with a fixed-setting manual re-
s
et high limit temperature device as standard or it may
have an optional adjustable setting manual reset high
temperature device.
T
he fixed-setting manual-reset high limit is located on
the outlet pipe of the heat exchanger on the left side of
the boiler (accessible through the front door for reset
as necessary).
Fig. 26: High Limit (Manual Reset)
High Limit — Auto Reset (Optional)
This heater is equipped with a fixed auto-reset high
limit temperature device.
The optional auto reset high limit is located on the heat
exchanger header, near the outlet.
Fig. 27: High Limit (Auto Reset)
NOTE: Each ignition module is specific to a single
model size. Care should be taken not to use a mod-
ule intended for a different model size.