Folks, I am having problems connecting my Nest thermostat to a boiler. Given Laars Mini-term JVS series with Temperature Control PCB Module (pictured below)
When I short Com call and Heat call wires the boiler starts working. Being a naive person I would expect to detect 24v AC, however my multi-meter shows only 2.6v which is not enough. I have only 2 wires running from this controller to a thermostat.
Question 1: How do I connect my thermostat to something that does have standard R,C, W1, W2, etc. terminal?
Question 2: Is it possible to supply required voltage via these 2 wire to power off the thermostat and without damaging the controller (additional gadgetry is OK)
Question 3: Looking carefully in the middle of the PCB controller legend shows "hopeful" R,C,W2,W1 PCB connector which must be on the opposite side of the device. It is not easy to reach and therefor can't be a standard interface to the controller. Am I correct?