radiant help

MikeA

I have a two zone radiant manifold four ports on zone one two ports on zone two with thermal actuators for zone control all WIrsbo. The actuators end switch goes into a simple Argo four zone relay w/o priority. The relay turns on circulator for radiant manifold. 



 Problem is the circulator wont turn on. If you jump the T&T at Argo, pump turns on. All actuators are opening and closing properly. When the actuators are open they complete the circuit and we have conductivity on the end switches. We pulled a new wire from remote manifold about 25 feet connected end switches to T&T same problem.  Everything is doing what its suppose to do independently but together it doest work.



 This system has been running four years and working properly up until now. I was thinking voltage loss and and maybe adding 24 volt isolation relay but why would the system work fine in years past and this just pop up?      

CMadatMe

Is that relay a Zone Valve Relay

If your using a zone valve relay the circulator needs to be wired as a system pump. The end switch from the control is wired to TT at the boiler. I believe on an Argo Zone relay there are 2 sets of ends switchs.  You should be able to use end switch 2 to power a pump. End switch 1 goes to TT on the boiler.  Go to Argo Industries web site. I'm sure there is a manual there.