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Honeywell RA889A Relay


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Posted by John Klingel on December 07, 2006 at 01:56:28:

I am using a Honey RA889A Relay Switch to ultimately have my 24 V Wirsbo digital thermostat turn on two items: (A) A radiant floor heat circ pump, 110 Volt and (B) the 24 volt Wirsbo "zone valve" on the floor heat pipe. The wiring looks fairly straight: (a) The black hot 110 volt wire is on L1 and its neutral is on L2. (b) The circ pump black wire is on N.O. and its neutral is tied to L2, and (c) I wired a jumper wire from L1 to COM. Apparently the relay will connect the N.O. to the COM to turn the circ pump on. OK so far? Question 1: Do I use X1 and X2 (auxillary low voltage) to send juice to the Wirsbo zone valve? Question 2: Does the RA889A also have a transformer in it so that the two wires that go between it and the thermostat are powered by the RA889A, or do I somehow power the thermostat with a separate transformer? Thanks again. john


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