Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
The Q674L has the following wires w-white, b-black, g-green,r-red, x-blue, y-yellow and o-orange. The wiring diagram for the honeywell rth6350 is: L, AUX/E, G, O/B, Y, R AND RC. I already spoke to honeywell and it didn't work so any help would be appreciated.
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Posted on Jan 02, 2017
rh is hot for heating rc is hot for cooling looks to me like ya need a heat pump stat some thing to control the reversing valve.Tom
Posted on Jun 18, 2009
you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
Posted on Nov 01, 2009
The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.
Posted on Apr 02, 2010
I printed out the instructions for your thermostat. It looks like you should have the following.
There should be jumper wire between Rh & Rc
Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.
Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.
White wire to W. Powers the heat relay
Yellow wire to Y. Powers the cooling contactor
Green wire to G. Powers the indoor fan relay
There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.
Hope this helps.
Posted on May 24, 2010
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