Temperature Limit Control; Immersion Heating Elements - Bradford White VR-150-(kW) Installation And Service Manual

HIGH WATER TEMPERATURE LIMIT CONTROL:
times. The source of the problem must be found and corrected to insure proper operation. The limit control is
covered with an insulation blanket which must be removed to push the red reset button. The blanket of
insulation must be replaced before the power is turned on and the water heater is returned to service.
Disconnect the main power top the heater before opening the element access panel to reset the high
NOTE:
The high limit control will not re-set until the water temperature has dropped below the set point of the high
limit.
IMMERSION HEATING ELEMENT:
HAZARD OF ELECTRICAL SHOCK - Before opening the access panel to remove or service
the immersion heating elements, make sure the electrical supply to the water heater is tu rned
"OFF". Failure to do this could result in death, serious bodily injury or property damage.
The unit is equipped with a fixed setting manual reset
high water temperature limit control. The water heater
temperature limit control has a fixed limit setting of 195°
F (90.6° C). If water temperature exceeds the limit set
point, the limit will break the control circuit and shut
down the unit. The limit control can only be reset after the
water temperature has cooled below the set point of the
limit. The high water temperature limit control is mounted
on the surface of the tank, above the heating element
installed at the highest point in the tank. The high limit
control is reset by pushing the red reset button on the
control. Operation of the limit control usually indicates a
major problem with the thermostat, contactors or heating
elements. Do not continue to push the reset multiple
CAUTION:
limit control.
WARNING:
The heating input to this commercial electric water heater
is provided by low watt density immersion heating
elements. The heating elements are constructed from an
incoloy sheath with a tin plate on the exterior surface .
Three element blades are mounted on a single hex-head
screw-in mounting flange. The element flange mounts into
a 1 1/ 2" NPT threaded connection welded to the storage
tank. The hex-head screw- in mounting flange seals to the
tank with an "O" ring gasket at the base of the threaded
portion of the flange. The tank flange has a matching recess
for the "O" ring gasket to insure a proper water tight seal.
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