One-line summary: Is there a solid-state version of the White Rodgers 90-113 Fan Control Center (Transformer and Relay Combination)?
EDIT to answer question: The thermostat draws 0.146A (3.5VA / 24V).
I recently upgraded to a smart thermostat. As part of the installation, I had to have an electrician run a C wire from my basement up to my thermostat. He installed a junction box in my basement which contains both a 24V transformer and an isolation relay. (White Rodgers 90-113, which comes with Honeywell R8222D1014. I'll attach photos below.) The setup is working fine; heat is being delivered perfectly.
The problem is: every time the thermostat kicks in, there's a loud click from the isolation relay. The relay/transformer are directly below our main living area, and the click is very audible and bothersome.
If there were no choice, we'd live with it. But my understanding is that solid-state relays are a silent and reliable alternative to the electromagnetic type which I have now. My question is: what's the easiest way for me to replace the existing relay with its solid-state counterpart? (And is it even possible/advisable to do so?)
Do I just replace the relay but leave the existing transformer in place? Or do I replace the entire assembly? Are relays designed to some standard form factor, so that they're interchangeable as long as the voltage specs match? Or will I need to find a particular size/shape relay to replace my existing one? Would something like this (Resideo RT850T-240/U) work, as a drop-in replacement?
In case it matters, it's a radiant hot-water system powered by an oil furnace. Thanks!
