Seisco SH-18 and Tekmar 256 Outdoor Reset
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Seisco SH-18 and Tekmar 256 Outdoor Reset
Currently I have a Seisco SH-18 wired to a Taco SR501 single zone relay which is controlling the Taco pump. The Seisco heats under any flow from the pump. I'd like to add an outdoor reset and purchased a Tekmar 256. I'm trying to understand how this will need to be wired. My initial assumption is that I keep the thermostat wired to the TT terminals in the SR501 and then go from 6 N/O and 5COM on the SR501 to 7 and 9 on the TEK256. I'd then go from 5 and 6 on the TEK256 to the disable control on the Seisco? I believe I'll need another 24V supply from somewhere for the TEK256 as well unless I'm missing something on the seisco or SR501?
http://docs.wixstatic.com/ugd/152e44...ac300ad728.pdf Seisco SH-18
http://www.tekmarcontrols.com/images...f?lbisphpreq=1 Tekmar 256
https://www.pexuniverse.com/docs/pdf/tc-102-375.pdf Taco SR501
http://docs.wixstatic.com/ugd/152e44...ac300ad728.pdf Seisco SH-18
http://www.tekmarcontrols.com/images...f?lbisphpreq=1 Tekmar 256
https://www.pexuniverse.com/docs/pdf/tc-102-375.pdf Taco SR501
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Last edited by doughess; 10-17-17 at 08:23 AM.
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The Tekmar 256 uses very little 24 VAC power and can be run off an existing transformer. As a precaution use 4 wires to Tekmar. two from 24 VAC source for power and two for contacts.
Last edited by doughess; 10-17-17 at 08:24 AM.