Hello,
I wired up a new heating system in a large home the last couple of days. In the system, there are a number of solid-state control boards that switch motorized valves on and off. Also, in the boards is a set of dry contacts. When the zone valve closes, the contacts go from N/O to N/C. The literature calls them dry, but they act a little funny. Normally on a dry set of contacts that I am used to, when the coil closes, you will get continuity on the contacts if they switch to the N/C side. On these particular solid-state boards, the contacts will only close after you have the presence of the control voltage put on one side of the contact. I messed with the boards for about 20 minutes watching the valves open and close and could never get the dry contacts to give me continuity. Only after I put the control voltage on one side of the dry contact did it kick in. Is this common anymore on solid-state control boards? I got to thinking about it, and it doesn?t have a coil or anything to pull in a set of contacts, so I would say yes.
Thanks
I wired up a new heating system in a large home the last couple of days. In the system, there are a number of solid-state control boards that switch motorized valves on and off. Also, in the boards is a set of dry contacts. When the zone valve closes, the contacts go from N/O to N/C. The literature calls them dry, but they act a little funny. Normally on a dry set of contacts that I am used to, when the coil closes, you will get continuity on the contacts if they switch to the N/C side. On these particular solid-state boards, the contacts will only close after you have the presence of the control voltage put on one side of the contact. I messed with the boards for about 20 minutes watching the valves open and close and could never get the dry contacts to give me continuity. Only after I put the control voltage on one side of the dry contact did it kick in. Is this common anymore on solid-state control boards? I got to thinking about it, and it doesn?t have a coil or anything to pull in a set of contacts, so I would say yes.
Thanks