SEQUENCE OF OPERATION
Sequence of Operation:
Surface Mounted Thermostats.
OR Terminal Block
Fuse Block
Line Voltage
Heating Element
Surface Mounted
Thermostat
Line voltage is applied across terminals of fuse block or a
terminal block. Line voltage continues down and connects
to surface mounted thermostats at terminals L1 & L3.
1
1
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.
2ECO Closed
Power to one
side of element
2
3
Water in tank is cold, so
all thermostats are
closed at terminal T2
(calling For heat). This
completes the circuit and
allows current to flow
through heating elements.
3Thermostat closed
at terminal T2
4
As each thermostat is
satisfied, 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.
4
Thermostat open
at terminal T2
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