Existing wiring is earth(yellow & green), Brown and Blue.
DT200 has 3 terminals A,B and C but C is covered over with a plastic tab.
I'm unsure where to put me existing wires,
SOURCE: I'm trying to install a
If the system worked before with three wires then the fan wire(green) must already be jumped to the Y terminal at the furnace. You should be able to run the red wire to Rh and Rc, run the white wire to W and run the yellow wire to Y on the new thermostat. You will not have control of the fan (ON or AUTO) from the thermostat. R is 24v from the furnace, W is the Heating circuit and Y is the Cooling circuit.
SOURCE: I just bought a honeywell
This thermostat will not work for your application. You need a Heat Pump thermostat. A comparable stat would be a Honeywell TH4210D1005
SOURCE: I have 2 Honeywell TH5220D thermostats installed
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.
6 pin socket
6 pin plug
7 pin
socket
7 pin plug
5 pin socket
5 pin plug
7 pin socket
7 pin plug
7 pin socket
7 pin plug
7 pin socket
7 pin plug
12 pin socket
12 pin plug
small 6 pin round plug
& socket
1 tail, clearance - brown
2 left hand turn - yellow
3 right hand turn - green
4 stop - red
5 electric brakes - blue
6 earth - white
small 7 pin
round plug & socket
1 left hand turn - yellow
2 reverse -
black
3 earth -
white
4 right hand turn - green
5 electric brakes - blue
6 stop - red
7 tail, clearance, side
markers - brown
round socket
large 5 pin round plug & socket
2 left hand turn - yellow
3 earth -
white
5 right hand turn -
green
6 stop - red
7 tail, clearance, side
markers - brown
large 7 pin
round plug & socket
1 left hand turn - yellow
2 reverse -
black
3 earth - white
4 right hand turn - green
5 electric brakes - blue
6 stop - red
7 tail, clearance, side
markers - brown
7 pin round
heavy duty plug & socket
1 earth -
white
2 left hand rear , clearance and marker - black
3 left hand turn - yellow
4 stop - red
5 right hand turn -
green
6 right hand rear , clearance and marker - brown
7 reverse/auxilary -
blue
7
pin flat plug & socket
1 left hand turn - yellow
2 reverse -
black
3 earth - white
4 right hand turn - green
5 electric brakes - blue
6 stop - red
7 tail, clearance, side
markers - brown
flat socket
12 pin flat
plug & socket
1 left hand turn - yellow
2 reverse -
black
3 earth - white
4 right hand turn - green
5 electric brakes - blue
6 stop - red
7 tail, clearance, side
markers - brown
8 battery supply -
orange
9 auxiliaries - pink
10 earth - white
11 rear fog lamp - grey
12 auxiliaries - violet
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