Specifications
54
2. Locate the box housing the solid state step controller mounted on the exterior of
the boiler. Remove the cover.
3. If a specific board has been determined to be defective, locate the board and
remove it from its seat by pulling gently away from the step controller.
4. Each board can be reseated in the appropriate mother board receptacle by simply
aligning the board and gently pushing the board into place.
5. If the entire mother board is to be replaced, tag each individual board and note its
position. After all individual boards have been removed, carefully remove the
screws that secure the mother board in the step controller case and remove the
board. Installation of the mother board can be accomplished by reversing the
removal steps. Be sure to carefully reinstall each individual board in its original
location.
6. If the entire solid state step controller is being replaced, make a detailed sketch of
the position of each wire attached to the step controller. After the sketch has been
made, remove each wire.
7. After all wires have been removed from the step controller, remove the screws
securing the step controller to its housing. Remove the step controller unit.
8. Assure that the new step controller is rated the same as the one being replaced. In
addition, check to make sure that the individual boards contained in the new step
controller correspond exactly with those contained in the original controller.
9. Position the new step controller in the housing and secure with the original screws.
10. Reconnect all wires to their original location. Consult the sketch made earlier in
this process.
11. To adjust the solid state step controller, consult the manufacturer's documentation
supplied with the new unit. The new step controller should be set to the same
specifications as the original. Those specifications were factory preset for
optimum performance of the unit.
12. Replace the cover on the box housing the step controller.
13. 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.