Replies

1. 
   DanH | Mar 30, 2008 04:00am | #1

   You miswired it.

   What is wanted is not the will to believe, but the will to find out, which is the exact opposite. --Bertrand Russell
2. 
   dreadlock | Mar 30, 2008 05:40am | #2

   do you have a picture of the wiring?

3. 
   DanH | Mar 30, 2008 07:20am | #3

   I'd first point out that you need two relays to control two pumps with two thermostats.

   A more detailed description of your setup would be helpful.

   What is wanted is not the will to believe, but the will to find out, which is the exact opposite. --Bertrand Russell
1. 
   IMERC | Mar 30, 2008 09:17am | #4

   I read it as he has a 2 zone relay.... DPDT/CO or similar or even a NO/NC/NO contactor....

   but like ya said... more info please... 

   Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->

   WOW!!! What a Ride!Forget the primal scream, just ROAR!!!

1. 
   DanH | Mar 30, 2008 03:21pm | #5

   You mean an interlocking relay, so they don't both come on at the same time?
   What is wanted is not the will to believe, but the will to find out, which is the exact opposite. --Bertrand Russell

2. 
   BillHartmann | Mar 30, 2008 08:03pm | #8

   It is more than a simple relay.http://www.taco-hvac.com/uploads/FileLibrary/SR502(102-082).pdf
   http://www.taco-hvac.com/en/products/Switching%20Relays/track_file.html?file_to_download_id=17062http://www.blueridgecompany.com/radiant/hydronic/427My guess is that it is miss wired..
   .
   A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.

4. 
   USAnigel | Mar 30, 2008 03:36pm | #6

   Are you using electronic stats?

5. 
   802Mike | Mar 30, 2008 04:07pm | #7

   Is it a SR502?

   Did you the jumper in the wrong place?