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Ignition Control Module
The intermittent ignition device conserves energy by
automatically extinguishing the pilot when the desired
temperature is reached. When additional heat is need-
ed, the combustion air blower starts to purge all air
from the combustion chamber for about 45 seconds.
On proof of air flow, the air proving switch closes and
the pilot reignites electrically, eliminating the fuel costs
of maintaining a constant pilot.
To ensure safe operation, the gas valve cannot open
until the pilot relights and is verified. The 100% pilot
safety is an electronic device which closes the main
gas valve within 8/10 of a second whenever the pilot
flame is interrupted. Pilot flame is automatically lit
when the device is powered and pre-purged. Unit per-
forms its own safety check and opens the main valve
only after the pilot is proven to be lit.
Fig. 31: Ignition Module
High Limit — Manual Reset
This appliance is equipped with a manual reset, high
limit, safety device. Push the reset button and adjust
the setting to 40°F above the desired operating tem-
perature.
Fig. 32: High Limit — Manual Reset
Flow Switch
Dual-purpose control shuts off boiler in case of pump
failure or low water condition. Mounted and wired in
series with the main gas valve. Check with the manu-
facturer for proper paddle size. Utilize correct paddle
size for proper operation.
NOTE: Flow switch will not operate if flow is less
than 20 gpm.
Fig. 33: Flow Switch
High Limit — Auto Reset
This appliance is equipped with an automatic, high
limit, safety device. Set the auto high limit to 30°F
above the desired operating temperature.
Fig. 34: Auto Reset — High Limit
45
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