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electrical input of the water heater in the summer
months when ground water temperatures are
warmer and full electrical input from the
immersion heating elements is not required. The
water heater may be restored to full input by
moving the switches to the “ON” position.
The water heater may be provided with an
optional time clock. The time clock will allow
the water heater to be turned on and off with a
pre-set schedule. The time clock may be
specified with a 24 hour scheduling period or
with a 7 day scheduling period. By the
adjustment of the setpoints on the time clock, the
water heater may be turned off when hot water is
not needed or in periods when the building may
not be occupied. The time clock allows the water
heater to automatically cycle on in advance of the
time when hot water may be needed. This will
insure that hot water is always available yet save
energy when there are scheduled periods when
there will be no requirement for hot water. This
feature is especially useful for schools and
building that are occupied on a fixed schedule.
As an additional feature, time clocks may be
furnished with a spring wound carry-over
function to insure that a switching schedule is
maintained in periods where there may be power
interruptions. The time clock works by making
and breaking the 120 VAC control circuit to the
contactor coils to shut down operation of the
heating elements in the desired time periods.
The water heater may be provided with optional
pilot lights to provide an external indicator for
each contactor or stage of heating elements that is
energized. Each pilot light is wired in parallel
with the 120 VAC control circuit feed to the
contactor coil(s). The pilot will be turned on as
the contactor coil(s) is energized by the
temperature controls.
Shunt trip disconnect provides a power
disconnect upon a control sensed malfunction via
a circuit breaker installed in the main power
supply to the water heater. The circuit breaker is
shipped as a separate item that must be field
installed. The water heater 120 VAC control
circuit provides a feed to the circuit breaker that
will shut down main power on either a low water
level condition (if equipped) or high water
temperature. Once the water heater is installed
and all power is connected, the toggle switch that
arms the shunt trip must be placed in the on
position to provide the shunt trip function on the
desired control sensed malfunction.
21
FIG. 27 Time Clock
TIME CLOCK (Optional)
PILOT LIGHTS (Optional)
SHUNT TRIP DISCONNECT (Optional)
ALARM BELL (Optional)
FIG. 28 Alarm Bell