Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I just purchased an Honeywell RTH3100C thermostat to replace an older Honeywell Model. The older one has Y, W1, and W2. Y was jumped to W1 and E was jumped to W2. On the newer one I jumped E to AUX, and connected wire Y to Y, but I don't have a W1 to jump Y to. The manual says if the old thermostat had Y, W1, and W2 I need to contact a contractor for help.

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  • pac1101 Sep 25, 2009

    The old thermostat is a Honeywell T8411R. Here's what I've learned by reading other blogs. I cannot verify it's accuracy.

    "The R and W posts on the thermostat are for heating, the R and Y posts are for cooling."

    From the T8411R manual located at:http://customer.honeywell.com/techlit/pd... I found:
    REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPERATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).

    While the jumper was in place from Y (yellow wire)to W1 on the T8411R, there was no wire connected from the heat pump into W1. So for now, Y is connected to Y on the RTH3100C with no additional jumper to a W1 (since there isn't one) and all seems to be working.
    I did connect E to E and put in a jumper between E and AUX on the RTH3100C(i.e. I treated AUX on the RTH3100C as W2 on the T8411R).

  • pac1101 Sep 26, 2009

    Correction: The last statement of the above comment is incorrect. What I did was connect the wire that was connected to W2 on the T8411R to AUX on the RTH3100C. Then I placed a jumper from AUX to E on the RTH3100C. Same effect, but there was no wire connected to E on the old T8411R, it was just jumped off of W2.

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jgwhomeequip
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SOURCE: heat will not shut off

Take white off of Aux, and attach it to L

Posted on Feb 16, 2009

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  • 1 Answer

SOURCE: Wiring

This will depend on type of system, standard high efficent furnance or heat pump. The orange terminal is for the reversing valve on the heat pump for the cooling cycle. Your best bet would be to get a thermostat that is fitted to your furnace instead of a universal t-stat. If I knew what brand of furnace, I could be more help.

Posted on Jun 01, 2009

jeffbvegas1
  • 520 Answers

SOURCE: wireing a honeywell thermostat

Bill ..You dont have a heat pump.This controller will not work for a conventional system. Get the right thermostat

Posted on Jul 24, 2009

  • 149 Answers

SOURCE: where does the W2 wire go?

w2 wire is second stage heat does your furnace have two stages.look at gas valve it would have 2 valves/ sol w2 will go to w2 on stat. if a single stage furnace w2 is not used

Posted on Jan 25, 2010

hvac1960
  • 2133 Answers

SOURCE: Y1 W1 Wire from older Honeywell to new RTH honeywell

Y1 means for cool and W1 means for heat. Connect accordingly.

Posted on Dec 02, 2010

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