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Help Needed ... turn on circulation pump when furnace in AC mode?

2251 Views 12 Replies 3 Participants Last post by  Yoyizit
Short version: I have a pump that simply plugs in to an outlet and is on non-stop. It draws ~120w. I need it to only be on when the furnace is on, and in 'AC' mode. How can I make this happen?

Long version: We've recently finished building our home in the SF Bay Area (temperate climate) and rather than build a full AC system in (which is fairly uncommon around here), we ran two copper coils into the ground and have created a "poor mans" ground loop cooling system. We've got a water-to-air radiator in the outlet of the furnace before it runs into the ducts, and a pump that pumps the water in a loop throughout the system. Obviously we only want the pump running when the furnace is in AC mode...

(Don't ask how well it works yet ... we just finished plumbing it last night and honestly its not hot enough around here to do any good right now...)
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simple catch the C off the TR then Y for cooling within the furnace,then the NO contacts for the black wire for the pump.this is an enclosed relay you pop a knock out on the side of the furnace and the wires end up inside the control section http://bestbuyheatingandairconditio...oduct_Code=REL8225A17&Category_Code=r-general
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