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high limit switch
The dual bulb controller (fig. 1) contains the high limit (energy cutoff)
sensor. The high limit switch interrupts main burner gas flow should
the water temperature reach 205°F (96°C).
In the event of high limit switch operation, the appliance cannot be
restarted unless the water temperature is reduced by at least 20°F
(11°C) and the high limit reset button on front of limit control (fig.1)
is depressed.
Continued manual resetting of high limit control, preceded by higher
than usual water temperature is evidence of high limit switch operation.
The following is a possible reason for high limit switch operation:
• A malfunction in the thermostatic controls would allow the gas
control valve to remain open causing water temperature to
exceed the thermostat setting. The water temperature would
continue to rise until high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
digital thermostat
figure 1.
electronic ignition control
each heater is equipped with a Honeywell ignition module. The
Direct Spark Ignition Control module controls the ignition
sequence and gas control operation of the water heater.
ignition module
figure 2.
features and components
barometric draft control
The heater is equipped with a double acting barometric draft
control. This control assembly is factory adjusted to automatically
regulate the chimney draft imposed on the unit.
barometric draft control
combustion chamber obserVation port
The combustion chamber observation access panel is located
above and to the left of the burner. A plug located under the
panel, see fig. 5, is inserted into the combustion chamber wall.
This plug should not be removed except, in rare cases, when
the combustion chamber requires cleaning or replacement.
uncrating
uncrate the heater by removing the outside mat and top locator.
The shipping pallet must be removed from the unit. It may be
possible to simply unbolt the base from the pallet and, with
the help of 2 or more persons, work the unit off the pallet.
Some units will be too heavy and will require the use of jacks
or lifting equipment to safely remove the pallet and move the
unit into position. Be careful when moving this heater. It will
tip over easily.
The heater is shipped with a burner and draft control. The
burner and draft control are shipped in separate cartons. They
should be installed as received without any alterations.
Discard the shipping crate and packaging cartons in an
appropriate manner.
7
figure 3.
figure 4.
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