Boiler Controls Wiring Diagrams. Gas furnaces will automatically turn the indoor fan on by another control in the furnace. Furnaces are turned on by the w terminal by energizing a relay.
No boiler condensate drain required proprietary design available for natural gas or propane. If you are a business or a tradesman you can open a trade boiler spares account with dhs. Have a technical support question.
However most gas boilers you will be working on have 24 v controls.
Meet the stainless steel dream team versa ic intelligence with raymote access instant visibility of heaters and boiler status xvers l learn more xfiire learn more. The control box is a thm5421c and the wiring is set up as a 3 wire control which is what is required on the th9421c1004 and it is marked 123. If your system does not support opentherm you will need to select onoff boiler control instead of opentherm. Its important to protect you your system and your thermostat.