55
14.
If no arcing is detected, the unit is ready for operation.
Potentiometer - Replacement
The potentiometer is mounted on the box that houses the solid state step controller and is
mounted on the door of the solid state step controller panel. If it is determined to be bad
and must be replaced, follow the steps.
t
Solid state component boards are very fragile and subject to damage from any type
of electrical charge - even static electricity. Before touching any board, assure that
the electric power source has been shut off and locked out all static electricity has
been removed from your body by touching a suitable ground (such as the cold
water inlet piping).
1.
Turn off and lock out the power to the unit.
t
The combination of electricity and water can pose a
very dangerous situation
.
Assure that all power has been
shut off / disconnected and locked out
in an
approved manner, before attempting any installation or maintenance procedures.
2.
Locate the box, mounted on the exterior of the boiler, housing the solid state step
controller and potentiometer. Remove the cover.
3.
Tag the wires connected to the potentiometer to assure proper reconnection after
the new potentiometer is installed. Disconnect the wires.
Note: Care should be taken not to damage the solid state step controller or any of its
component boards during these procedures.
4.
Remove the potentiometer from its mounting.
5.
Verify that the new potentiometer is rated the same as the one being replaced.
6.
Mount the new potentiometer in the same position as the original potentiometer.
7.
Reconnect the wires in the same position from which they were removed from the
original potentiometer.
8.
Replace the cover of the box housing the potentiometer and step controller.
9.
After assuring that all tools and foreign materials have been removed from the
electric control cabinet, and that all personnel are clear of the unit, turn on the
power. As the power is turned on, visually inspect for signs of "arcing". If any
arcing is detected, immediately turn off the power, examine the wires, and assure
the tightness of all connections.
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Страница 62: ...59 9 If no leaks are found follow the startup procedures page 17 to put the unit back on line ...
Страница 63: ...60 Appendix A Typical Wiring Diagrams Figure A 1 Typical Wiring Diagram For Electric Water Heaters ...
Страница 64: ...61 Appendix A cont d ...
Страница 65: ...62 Appendix A cont d ...
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