Bradford White 80A Manuel d'instructions télécharger pdf (Page 36)

SEQUENCE OF OPERATION

The Power Circuit Wiring Diagram illustrates the electrical connections from the incoming power supply through the

contactors to the heating elements. The power circuits are available with internal circuit fusing and without internal

ircuit fusing.

As it would be impractical to show all wired configurations in this service manual, a reference wiring diagram is

llustrated below to aid in the understanding of the power circuit operating sequence. Service providers must refer to the

water heaters power circuit wiring diagram attached to the inside panel of the control cabinet for the specific connections

of the water heater being serviced.

he power circuit components and supporting information that appear on the wiring diagram include the following:

Field wiring connection via terminal block or other connection point

Fuse block with amperage ratings displayed (when provided)

Contactors with amperage ratings displayed

Electrical elements with voltage and wattage ratings displayed

Water heaters total amperage draw is displayed

Power Circuit Description-

Line voltage is applied across terminals of fuse block

or a terminal block. Line voltage continues down and

connects to terminals L1, L2 & L3 of one or more

contactors.

A) Contactor is open (no call for heat), so there is no

voltage across terminal T1, T2 & T3

of contactor.

B) The contactor is controlled by the control circuit

as explained on pages 10 & 11.

The control circuit senses a call for heat and

energizes the operating coil within the contactor.

The energized contactor coil causes the contactor to

close energizing the elements from terminals T1, T2

& T3 of the contactor.

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

elements.

Power Circuit Sequence-

ine voltage from

service panel

Line voltage to

control circuit

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Bradford White 80A Manuel d'instructions Page 36