Bradford-White Corp 9kW, 900kW Disconnect the main power, Immersion Heating Element, Danger

reset multiple 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.

CAUTION: Disconnect the main power

to the heater before opening the element access panel to reset the high limit control.

NOTE: The high limit control will not reset until the water temperature has dropped below the set point of the high limit.

IMMERSION HEATING ELEMENT

FIG. 22 Immersion Heating Element

WARNING:

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 turned “OFF”. Failure to do this could result in death, serious bodily injury or property damage.

The heating input to this commercial electric water heater is provide 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. . 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 (Optional)

FIG. 23 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.

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