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

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Wiring a thermostat

How do i wire a RTH6300B thermostat i have 2 wires 1 W 1 R

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  • Anonymous Feb 20, 2009

    It seems that this thmostat cycles too quickly..is there a way to change this?

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2 Answers

Your red wire will go to the R, RC, or RH terminal on the stat does'nt matter which one ,this is the wire that provides 24 volt from the furnace. the white wire will connect to the W terminal on the stat. If there is a jumper wire that came on the stat going from RC to RH leave it on.

Posted on Mar 13, 2008

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Your red wire will go to the R, RC, or RH terminal on the stat does'nt matter which one ,this is the wire that provides 24 volt from the furnace. the white wire will connect to the W terminal on the stat. If there is a jumper wire that came on the stat going from RC to RH leave it on.

Posted on Mar 13, 2008

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SASSYBEAR
  • 148 Answers

SOURCE: wiring a thermostat

what kind of system are you hooking it to? heat pump or heat/ac?

Posted on Mar 08, 2008

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Sad to say but you have bought an non compatible thermostat, what you need is a thermostat that has "Heat Pump" somewhere on the package, Honeywell makes those also in the same models, sometimes they can be tricky if your not looking. It should also say 2heat, 1cool too. Hope this helps and good luck!

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I am replacing old 220 volt thermostat with a programable 220 volt thermostat. There are 6 wires in the box. (3 black & 3 red) There are only two black wires on the new thermostat. On the old...


Hi, this can be confusing. Be sure you have the power off before you wire it, but first you have to have an elect meter. The 6 wires in the box you will only use 2 of them. Cap the other 4 off. Use the 2 that have the correct voltage across them, 208, 220, 240 volts. The new stat is only set up for 2 hot wires 120 each. That will do it. Not to bad. be careful! Use care. Good Luck, Sincerely,
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You have to know what the wires go to.

(1) wire will come from the transformer and it connects to the r/c and r/h

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You will have to have schematics from the old wiring diagram. Then you will have to confirm its consistency with actual old wiring before you can be sure that the wires run to the proper places on the old heater and a/c system. This sounds like a gas furnace and is simpler than a heatpump. Once you know what distinguishes the wires with the same color, you should label them and then you may call them a different color if they were wired with wrong wire colors. You may be in luck if you go to the furnace control box an look at the terminals.. They are usually labeled with a R for Red and W for white and Bl for Blue and B or Black. If you have other colors on these then it sounds that it was wired with wire spare wire by someone who knew what they were doing but neglected to leave a path for someone else follow.
You may be able to use a continuity tester of circuit tester to id these wires that are in question...
ie, once indintified, you can match with the requirements of the new stat.

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I currently have a 2 wire system. I have one red and one white. I hooked the red to the R and the white to the W. I had to go into the system setup using the UP arrow button and the FAN button. The first setting is the 1 setting, and I selected number 2 ( Heating Only ). Then the 5 setting. I selected number 1 ( Gas/oil steam or gravity system ). Then 14 is usually 0 for Fahrenheit. I was just messing around and that is the buttons I used and I tested it. The furnace kicked on and then 10 to 15 secs later the air began to blow through the vents. I hope this works for others who read this.

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How to wire 1 plf 1504d heater


I have the solution, finally after looking for 2 days.

First off, I couldn't quite put it all together based on what I was reading. I finally tracked down the Fahrenheat web site (www.fahrenheatpro.com). And called tech support (800) 452-4179.

To wire 2 BB units to 1 tstat.

1. Use #14 wire for 0-12 amps, #12 wire for 12.1 to 16 amps and #10 wire for 16.1 to 24 amps.

2. I have a 12/2 wire going from the tstat to BB#1 and another 12/2 wire going from BB1 to BB2.

3. Onthe left side of the heater, you will have 2 sets of black wires tied together with a nut (on right side it's 2 sets of Black/Red wires). You can use either side of the heater. For the purpose of explaining this, lets use the left side, 2 sets of black wires.

4. Undo one of the sets of black wires (it doesn't matter witch), the other set will be left alone.

5. Take the black wire coming from the tstat and tie it into one of the black wires from the heater and the black wire going to the second BB unit. So you will have those 3 wires tied together with a nut at the 1st BB unit.

6. Take the white wire coming from the tstat and tie it into the other black wire from the heater and the white wire going to the other BB heater. Again, you will have 3 wire tied together here.

7. At the second BB unit, tie the black wire coming from the 1st unit to one of the black wires in one of those 2 sets of black wires. Again, only undo 1 set of wires at the 2nd unit, leave the other one alone. Tie the white wire coming from the 1st unit to the other black wire.

8. Make sure ground wire in grounded at the tstat and at both BB units.

Hope this helps...... If I was less clear than I hoped, call tech support and they will walk you thru it....

Kevin.

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Honeywell 5+2 day programmable thermostat will keep heating to 29 degrees!


Is sounds like you wired it correctly, The black is a little unusual perhaps its blue, anyway, try disconnecting the wires from the thermostat and see if it shuts off. If so, then it may need to re calibrated. I will need some more info to help you anymore.

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