Installation / Operation Instruction Manual
18
Servicing Guide
This “Servicing Guide” section of this Installation and Operation Installation
manual is provided for the purpose of improving the effectiveness and the
efficiency of servicing this water heater. This information is intended to assist
qualified service personnel. Servicing of this water heater may require
knowledge of electrical testing instruments. If you are unfamiliar or unsure of
the electrical circuits or the testing instruments, consult a qualified electrician.
This section of these Installation and Operation Instructions is not intended
for use as a troubleshooting guide. For troubleshooting instructions please
contact the supplier from whom this water heater was purchased, or the
manufacturer listed on the rating plate.
This water heater has two distinct electrical systems. One system connects
the electrical power to the heating elements, while the other system controls
the water heater operation. The electrical contactors interconnect these two
systems.
In order to clearly illustrate the electrical circuits, two wiring
diagrams are provided. These diagrams are labeled as the “Power Circuit
Wiring Diagram” and the “Control Circuit Wiring Diagram” and they are
attached to the surface of the panels inside the water heater control cabinet.
Control Circuit Description
This description will explain certain aspects of the Control Circuit. The control
circuit operates with 120VAC electrical service. This voltage is provided by
the multi-tap transformer which
has the primary coil connected to the field
wiring that is serving the water heater. The Transformer, the Water Heater
Thermostat, the Hi-Limit Temperature Control, and the Contactor Coil are
always included in the Control Circuit.
Referring to the “Control Circuit Wiring Diagram,” the contactor coil is
energized when the Thermostat senses a need for heating. Electrical current
to the contactor coil will be interrupted when the water temperature is
sufficient to satisfy the temperature limits of the either the Thermostat or the
Hi-Li
mit Control. The Hi-Limit Control is provided with manual reset buttons.
Certain other control components are available as “Optional. “ When these
optional components are installed with the water heater, the control circuit
wiring diagram accordingly will include these components. The optional
equipment available from the manufacturer includes the following:
High Water Pressure Switch
Low Water Pressure Switch
Low Water Level Switch
Alarm Horn
Heating Element Sequencers
Electrical Door Lock