Sequence Of Operation - Bradford White E32-50S Service Manual

E32 series medium duty, field convertible commercial electric water heaters are designed to operate using single phase
or three phase service connections. One size fits all Internal fusing is factory installed for all units. When field
conversions are required, no fuse change is necessary. Three surface mounted thermostats operating independently
are used to control a corresponding heating element.

Sequence of Operation.

1
Single phase line voltage is applied
across terminals L1 and L2 of terminal
block. Or Three phase line voltage is
applied to terminals L1 through L3 of
terminal block. Line voltage continues
through terminal block and fuse blocks
and connects to thermostats at
terminals L1 & L3.
2
ECO (high limit) in thermostat is closed,
so there is line voltage present at
terminal L4 of thermostats and to one
side of each element.
Water in tank is cold, so all thermostats
3
are closed at terminal T2 (calling For
heat). This completes the circuit and
allows current to flow through heating
element.
As each thermostat is satisfied,
4
it opens at terminal T2 interrupting
current flow through the respective
element. The system is now in stand-by
mode, waiting for the next call for heat.
1
Terminal Block
Thermostat open
at terminal T2
SEQUENCE OF OPERATION
Fuse Block
2
ECO Closed
4
Page 5
Thermostat closed
at terminal T2
Power to one
side of element
3