Re: oil fired furnace X-10 off/on swich control

[Lewis Gardner <lgardner@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Lewis Gardner wrote:
> replace the switch with a center off DPDT switch
> that would provide X-10 OFF ON positions.
>
>                  /
> power -------o  o  o--------- furnace
>                 |/    |
>              o  o  o  |
>              |        |
>              |   /    |
>               --o  o--
>                 X-10

Whoops!

I was done in by my own over complication. A center off SPDT switch is
all that is needed. The previous DPDT drawing will not supply power to
the furnace in the right position...

                  ------
                 |      |
                 | /    |
power -------o  o  o    ------ furnace
              |      |
              |  /   |
               -o  o-

The top switch is a center off SPDT switch, the lower switch is a low
voltage x-10 module like the UM506.

In the right ON position the low voltage X-10 switch has control. The
center OFF position and left ON position work like current switch.

So it is ON OFF X-10 or as Bobby pointed out in simplified terms
SUMMER | OFF | WINTER


** Or if you want to keep the switch positions X-10 OFF ON here is a
schematic:

power ----------
                 |/
              o  o  o--------- furnace
              |        |
              |   /    |
               --o  o--
                 X-10


I kind of like the top one since the furnace is connected to nothing in
the center off position. It is a little easier to "read" as installed.
Sorry, it was late...