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The optional single-try ignition module will lock out
after failing to light one time. To reset it, press and
release the small, recessed black push button located
inside of the cut-out on the lower right-hand corner of
the ignition module case. Turning off the power to the
heater WILL NOT reset the 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 40 - 50°F above desired operating tem-
perature.
Flow Switch
This dual-purpose control, mounted and wired in
series with the main gas valve, shuts off heater in case
of pump failure or low water flow.
Operating Control
The heater may be equipped with different types of
operating controls. Consult the individual control data
sheets supplied with your heater paperwork. See the
Fig. 30: High Limit (Manual Reset)
Fig. 31: Flow Switch
Fig. 32: Operating Control
Low Water Cut-Off (Optional)
The low water cut-off automatically shuts down the
burner whenever water level drops below the level of
the sensing probe. A 5-second time delay prevents
premature lockout due to temporary conditions such
as power fluctuations or air pockets.
Fig. 33: Low Water Cut-Off
High and Low Gas Pressure Switches
The low gas pressure switch (standard) connection
mounts upstream of the gas valve to ensure that suffi-
cient gas pressure is present for proper regulator per-
formance. The low gas pressure switch automatically
shuts down the heater if gas supply drops below the
factory setting of 5.0 in. WC for natural gas, and 10.0
in. WC for propane gas.
The high gas pressure switch (optional) connection
mounts down-stream of the stage-1 gas valve. If the
gas pressure regulator fails, the high gas pressure
switch automatically shuts down the burner.
General Safety Section for safety precautions con-
cerning domestic hot water applications.