Low Water Cut-Off; Low Water Pressure Switch - Bradford White VR-150-(kW) Installation And Service Manual

The "O" ring element gasket must be replaced with a new gasket when an element is removed for inspection,
cleaning or replacement.
SAFETY DOOR INTERLOCK:
The optional safety door interlock is an electrically operated locking pawl that is energized when main power
to the water heater is turned "ON." The interlock is mounted to the inside of the electrical control panel door
and extends behind a locking flange when energized. Main power may be turned off and the electrical access
door may be opened for service.
With the door open, main power may be energized if required to service or troubleshoot the operation of
selected components.
DANGER:
HAZARD OF ELECTRICAL SHOCK - Full power is present whenever the cabinet door is opened
and main power is turned "ON" even with the pilot switch(es) turned off.
LOW WATER CUTOFF (OPTIONAL)
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.

LOW WATER PRESSURE SWITCH:

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 an auto-reset function or a manual reset function on low water pressure.
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