THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN.
A low voltage (24VAC) room thermostat is required for room temperature control with the Comfort Plus Hydronic system. Steffes recommends using a digital thermostat. If utilizing a mechanical thermostat, a load resistor may be necessary due to the low current draw (0.01 amps) on the heat call input circuit of the Comfort Plus system. Contact the factory for information on thermostats available from Steffes.
Please see the Table of Contents at the left or wiring diagrams below based on the needs of the application (click on the 
icon to see that topic). If using a 5100-Series in conjunction with one or more other boilers as primary or secondary heat source, please contact Technical Support.
NOTE: Low voltage wires MUST never enter any line voltage enclosure.
