Bradford White 20A Instruction Manual download pdf (Page 19)

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

provide 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-Limit Control. The Hi-Limit Control is provided with manual reset buttons.

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Bradford White 20A Instruction Manual Page 19