Wiring for primary/secondary piping

coalmanjoe · Post by **coalmanjoe** » Mon. Nov. 18, 2019 5:46 pm

I am building our "retirement" home and will be installing an EFM DF520 with three zones for radiant, copper fin, and cast iron baseboard. I have installed several stokers for myself and others but this is my first time using primary/secondary piping. I have done considerable research and understand the piping but I have a question about the wiring for the primary and secondary pumps. I plan on using the old but reliable L8124A aquastat (I have 3 of these gems) to control the boiler----I'll use the ZR terminal for the timer. I would like to use a Taco SR5034 relay for the secondary pumps-----can I use this relay to turn on the primary pump whenever a secondary pump turns on?????? I do not want the primary pump to run 24/7 only when a secondary pump turns on. If I can't use this relay is there an alternative relay or setup to accomplish this??? Any help will be greatly appreciated.

nepacoal · Post by **nepacoal** » Mon. Nov. 18, 2019 6:05 pm

Look at the SR503-EXP-4 model... It has a connection for the primary circulator.

coalmanjoe · Post by **coalmanjoe** » Mon. Nov. 18, 2019 6:12 pm

Thank you for the info my friend!!!

nepacoal · Post by **nepacoal** » Mon. Nov. 18, 2019 6:14 pm

coalmanjoe wrote: ↑
Mon. Nov. 18, 2019 6:12 pm
Thank you for the info my friend!!!

Anytime... And don't forget to post pictures of your install. You know we love pictures!

coalmanjoe · Post by **coalmanjoe** » Mon. Nov. 18, 2019 7:16 pm

I surely will as I too enjoy the pictures on this site. Thanks again for the info.