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EQUENCE OF OPERATION
Sequence of Operation:
Surface Mounted Thermostats.
OR
Terminal Block
F
use Block
L
ine 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.
2
E
CO Closed
P
ower 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.
3
Thermostat 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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