Servicing should only be performed by a Qualified Service Agent
7
WATER HEATER CONSTRUCTION
WATER HEATER CONSTRUCTION
Electronic Controls
The water heaters covered in this Service Manual are equipped with an electronic control
system - see page 56. The control system senses temperature electrically from an
Immersion Temperature Probe. The probe is installed in a threaded opening in the storage
tank (wet well) and senses water temperature directly. As the stored water temperature rises
and falls the control system de-energizes and energizes heating elements indirectly using
electromagnetic contactors. The control system energizes the electromagnetic contactor’s
(120 VAC) coil causing the switch contacts of the contactor to close which in turn supplies
power to the heating elements - see pages 34 - 38.
Heating Element Configurations
Depending on tank size and how they were ordered from the factory the water heaters
covered in this Service Manual may be equipped with 1 to 5 electric heating elements. Total
input KW ranges from 3KW to 90KW. The water heaters covered in this manual are
available in storage tanks sizes from 5 to 120 gallons.
Power Conversions
Other than power supply phase conversions on some models the water heaters covered in
this Service Manual cannot be field converted. Voltage and KW conversions ARE NOT
permitted. See the Instruction Manual that came with the water heater for more information.
If the Instruction Manual is not available copies can be obtained from the manufacturers web
site or by calling the technical support phone number shown on the water heater labeling
and the back cover of this Service Manual.
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