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Servicing should only be performed by a Qualified Service Agent
7
WATER HEATER CONSTRUCTION
WATER HEATER CONSTRUCTION
There are two types of commercial electric water heaters covered in this manual. See Figure
1 on page 8 and Figure 2 on page 9.
SURFACE MOUNT CONTROL MODELS
The first type of water heater covered in this manual is equipped with surface mount
thermostat/ECO controls - Surface Mount Control Models. There will be separate
thermostat/ECO (energy cut out) combination controls mounted to the surface of the storage
tank directly above the heating elements they control. IE: a water heater equipped with 9
heating elements will have 9 combination thermostat/ECO controls. These combination
thermostat/ECO controls sense temperature directly from the surface of the storage tank.
Each combination control will have a temperature setting adjustment screw. As the tank
(water) temperature rises and falls each individual thermostat will de-energize and energize
one heating element according to it’s temperature setting.
ELECTRONIC CONTROL MODELS
The second type of water heater covered in this manual is equipped with an electronic
control system - Electronic Control Models. 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 Banks of 3
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.
HEATING ELEMENT CONFIGURATIONS
Both types of water heaters covered in this manual are factory equipped with either 3, 6 or 9
heating elements depending on how they were ordered from the factory - see the Heating
Element Configurations table on page 21. Each group of 3 heating elements (physically
installed in diagonal rows of 3) is referred to as a “Bank” of heating elements. Bank 1 is the
lowest group of 3 heating elements, Bank 2 is the middle group of 3 heating elements and
Bank 3 is the upper group of 3 heating elements. See Figure 1 on page 8 and Figure 2 on
page 9.
Heating Element Voltage and KW Conversion Kits
Voltage and heating element KW conversion kits are available for the water heaters covered
in this manual. Voltage and KW conversions are not covered in this manual. Voltage and KW
conversion kits with instructions are available from local distributors and can be ordered
from the manufacturer’s parts department by calling the toll free number listed on the back
cover of this manual. Have the complete model and serial number along with the listed
voltage and input KW from the rating label of the water heater on hand before calling.
Service Note: There are field conversion kits to increase/decrease KW input and change
voltage. However, conversion kits do not allow adding heating elements to a water heater.
Water heaters must remain as they were configured with 3, 6 or 9 heating elements from the
factory. HEATING ELEMENTS CANNOT BE ADDED TO A WATER HEATER.