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What causes the boiler to fire?
From the manual of my switching relay ARGO ARM-6P
- isolated switch coil is energized and contact closes
- X-X switch is closed, and X-X indic light turns on
- controller relay close, ZC-ZR indicator light turns on. ZC to ZR connection is required by factory installed jumper or through boiler squastat. ZC-ZR are 120 VAC connection.
- zone circ relay closes, turning on circulator
i was looking at the relay board. the wires on the X-X head to the boiler. and connects to the R and G terminal:
but the schematic from the boiler manual shows it for 24v thermostat.
a little confused. the XX isolated end switch contact is for the 24v thermostat part on the boiler? or does it even matter? as long as the contacts of XX is closed, the boiler will fire up? XX is just a contact, it doesn't dedicate the voltage.