Seisco SH-18 and Tekmar 256 Outdoor Reset


  #1  
Old 10-14-17, 09:07 AM
O
Member
Thread Starter
Join Date: Oct 2017
Location: United States
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
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
 
  #2  
Old 10-17-17, 06:40 AM
D
Member
Join Date: Apr 2014
Location: us
Posts: 1,350
Received 105 Upvotes on 99 Posts
**************************************************
 

Last edited by doughess; 10-17-17 at 08:23 AM.
  #3  
Old 10-17-17, 06:45 AM
D
Member
Join Date: Apr 2014
Location: us
Posts: 1,350
Received 105 Upvotes on 99 Posts
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.
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: