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This water heater may be equipped with an
optional electronic low water cut-off installed at
the factory. This low water cut-off device uses a
water level sensing probe located above the
heating element installed in the highest point in
the storage tank. If the internal water level drops
below this point, the low water cut-off will shut
down operation of the heating elements. An
electronic type low water cut-off is available as a
factory supplied option on all models. The
optional electronic low water cut-off has an LED
located on the main circuit board. This LED will
be illuminated and the control circuit will be
completed between the common and normally
open contacts on the circuit board when the
sensing probe is below the water level in the
storage tank. An optional manual reset function
and test button is available on the electronic low
water cut-off. The operation of a low water cut-
off should be inspected every six months.
A low water pressure switch is available as an
option on this water heater. A water pressure
switch is used to monitor the water pressure in the
water heater storage tank. If the water pressure
drops below an adjustable set point, the control
circuit is opened and operation of the water
heater is shut down. The low water pressure
switch may be specified with either a auto-reset
function or a manual reset function on low water
pressure.
A high water pressure switch is available as an
option on this water heater. A water pressure
switch is used to monitor the water pressure in the
water heater storage tank. If the water pressure
rises above an adjustable set point, the control
circuit is opened and operation of the water
heater is shut down. The low water pressure
switch may be specified with either a auto-reset
function or a manual reset function on high water
pressure.
As an option, a switch or multiple switches may be
provided to interrupt the 120 VAC control circuit
feed to the contactor coil or coils from the
immersion heating thermostat(s). This switch may
be used to manually turn off a portion of the heating
element input. This feature may be used to reduce
20
Control Board
Probe
LED
FIG. 24 Electronic Low Water Cut-off Control
LOW WATER PRESSURE SWITCH
(Optional)
FIG. 25 Low Water Pressure Switch
LOW WATER CUTOFF (Optional)
HIGH WATER PRESSURE SWITCH
(Optional)
FIG. 26 High Water Pressure Switch
MANUAL LIMITING SWITCHES (Optional)