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-   -   honeywell rth221b thermostat not signaling automatic draft to open (http://www.diychatroom.com/f17/honeywell-rth221b-thermostat-not-signaling-automatic-draft-open-161675/)

bronco77 10-30-2012 08:17 PM

honeywell rth221b thermostat not signaling automatic draft to open
 
OK i have a hotblast 1800 wood furnace, and just installed a new limit switch, fan center and thermostat. Everything seem to be working except for the automatic natural draft is not opening. I have wire hooked from r on thermostat to r on fan center and g to g. But when i jump r to g with wire on fan center it opens. Then when i remove wire it closes. I have wired exactly how my manual states. Any help would be great thank you

Houston204 10-30-2012 08:26 PM

Move the jumper behind the stat to HE...

Quote:

2.4 Fan operation setting
NOTE: This setting is not applicable if there is no fan connected to
the G terminal.
The jumper is located on the back of the thermostat faceplate. It
determines how the fan operates when placed in Automatic mode.
HG (factory setting): Leave the jumper in this position for gas or oil
heating systems. In this position, the heating system controls the
fan operation and activates the fan only when the plenum air is
sufficiently warm.
HE: Place the jumper to this position for electric heating systems.
In this position, the thermostat activates the fan only when there is
a call for heat.

bronco77 10-30-2012 08:35 PM

Quote:

Originally Posted by Houston204 (Post 1041394)
Move the jumper behind the stat to HE...

Mine has a switch labeled gas or electric / electric or heat pump. So i should switch it to heat pump?

bronco77 10-30-2012 09:01 PM

Thank you for your fast reply. Works great.


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