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The high limit control will not
reset until the water temperature has
dropped below the set point of the high limit.
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.
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.
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.
19
SAFETY DOOR INTERLOCK (Optional)
FIG. 22 Immersion Heating Element
NOTE:
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 turned “OFF”. Failure to do this
could result in death, serious bodily injury
or property damage.
WARNING:
Disconnect the main power
to the heater before opening the element
access panel to reset the high limit control.
CAUTION:
FIG. 23 Safety Door Interlock
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.
DANGER: