TEMPERATURE CONTROL
38
HIGH-LIMIT THERMOSTAT ADUSTMENT
A Honeywell high limit thermostat is used on both On/Off and Hi/Lo
water heaters (refer to “Location of Controls” on page 26. The
thermostat has a capillary style temperature sensor located in a well
(pocket) fitted in the outlet header and senses the temperature of the
water leaving the water heater.
The high limit temperature setting is adjusted by removing the front
cover (loosen one Phillips-head screw) and turning the adjuster.
The high limit is reset by pressing the red button on the front of the
thermostat. It may be necessary to allow the system water
temperature to cool sufficiently before the high limit can be reset.
In general, the high limit should be set approximately 15°C above the operating temperature, however the following
maximum limits must be observed:
Water Heating Applications: 90°C maximum.
Mechanical/Process Heating Applications: 99°C maximum for vented systems and 90°C maximum for
unvented systems.
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