Bradford White 80A Manual de instrucciones descargar pdf (Pagina 34)

SEQUENCE OF OPERATION

This water heater has two distinct electrical systems. One system, referred to as the “Control Circuit”, controls the

ater heater operation, while the other system referred to as the “Power Circuit”, connects the electrical power to the

heating elements, 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 “Control Circuit Wiring Diagram” and the

“

Power Circuit Wiring Diagram” and they are attached to the surface of the panels inside the water heater control

cabinet.

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, Thermostat, Hi-Limit

ontrol, and the Contactor Coil are always included in the Control Circuit.

Control Circuit Description-

Certain other control components are available as “Optional“. When these optional components are installed with the

ater 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

Control Circuit Wire Diagram

When the thermostat calls for heat, contacts close

inside the thermostat completing the circuit and

energizing the contactor coil.

The energized contactor coil causes the contactor to

close energizing the heating elements.

When the temperature setting of the thermostat is

reached, the contacts in the thermostat open. This

interrupts current flow through the control circuit de-

energizing the contactor coil.

The de-energized contactor coil causes the contactor

to open, interrupting current flow through the Heating

elements.

Page 10

NOTE: To help understand the concept of the operating sequence,

the control circuit shown is without any optional controls. See page

11 For control circuit showing all available optional controls

Control Circuit Sequence of Operation-

Line voltage from

power circuit

Line voltage is applied to control circuit fuse block.

Line voltage continues to transformer with one leg of

voltage connecting to the common terminal and the

other leg connecting to the appropriate line voltage

multi-tap terminal. Transformer output (always 120

volts) continues to high limit (ECO) control.

Hi limit (ECO) control is closed so one leg of 120 volts

continues to one side of the contactor coil. The other

leg is connected to the thermostat.

Appropriate line

voltage multi-tap

terminal

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Bradford White 80A Manual de instrucciones Pagina 34

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