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Posted by hvactech2 on July 20, 2005, 6:19 pm
>Hi,
>
>I have an old Lennox furnace (circa late 60's) with an A/C added on. The
>schematic has not been marked up after an addition of the A/C. Had an air
>blower relay failure recently and noticed that A/C compressor still switched
>on, even without the blower running. That can't be right. When heat is
>used, the blower does not come on unitl the air is hot.
>
>Can someone point me to a "typical" schematic for a Furnace-A/C system.
>
>Rich
>
It is correct. in A/C mode there is no fan proof on a residential
system.
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