Original message
| rjmarkin
 |  "complex thermostat for a simple application"
, posted Tue 22 Nov 01:06  
I have a Honeywell CT3500 programable thermostat and a simple pellet stove heat source with a 2 wire (red and white) 24 volt thermostat circuit. I can't seem to get the Honeywell to work appropriately and am wondering about the correct wiring. I've attached the red wire to the R terminal and the white wire to the B terminal. The stove comes on and provides heat but won't shut down when temp setting is reached. If I attach the white wire to the W terminal on the thermostat then the stove won't come on at all even when heat is called for. A simple mercury switch thermostat works just fine but I want the ability to program for reduced temperatures at night etc. Will this thermostat work with some changes in wiring hookup or will I need a different thermostat unit?
Jeff Markin
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Replies:
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| Flamesteel
| "Re(1):complex thermostat for a simple applica" , posted Fri 2 Dec 20:52
Hello Jeff, here's a couple of thoughts for you.
1. remove stat wires from stat, hold the stat wires together,
this should put your stove into "ON" demand. If not, then you have issues with the stove controller.
2. Stats are nothing more than a means of turning things
ON & OFF like a light switch. They operate as a means to sense and control temperature.
If your stove works by holding the two wires together, then the stat will function as advertise. Now you need to hook up the two wires properly to the stat in order for correct operation.
You should be able to hook up either wire to the "R" & "W" terminals. This is a multi-functional stat, but with your application either wire will work vis-versa.
Next is understanding the proper functions of the programmable stat. The owners manual does indicate that there should be a factory jumper wire connecting "R' & "RC" do not remove this wire. Program the stat, set the stat for heating, batteries?
Yes it does need batteries, use the temperature override buttons
to put the stat into a "heat" demand. If stove comes on, stat is functioning properly. Set stat for desired temperature. If stove does not come on, then you may have a faulty stat.
Here is a link for the Honeywell stat, if you do not have one.
God bless Honeywell for their E-support for the common man.
Hope this helps you out.
http://customer.honeywell.com/Techlit/Pdf/69-0000s/69-1199.pdf
Remember Safety First anyone who wishes to use any opinions should always research and obtain as much knowledge and information required before attempting any task. My suggestions are for informational purposes in which they may assist in your decisions.
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| kingtech123
| "Re(1):complex thermostat for a simple applica" , posted Mon 28 Nov 19:51
couple of things is this a gas or electric stove? make sure your switch is select on the right setting FEUL or GAS. Do you have the red wire connect to RC and RH ?
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