Hello, I'm trying to replace my old DICO Manual Thermostat with a new
Programmable HoneyWell RTH230B. There doesn't seem to be a model,
part, or serial number on the old thermostat, so I can't locate any
information on it via the Web (If you remove the fact place the
following numbers are stamped on the wall plate: 8639 E6 4). At any
rate, there are 4 wires going into the unit from the wall...they are
red, blue, green and white. Can anyone help me figure out which wire
goes to what? Thanks in advance...

wrote:
Hello, I'm trying to replace my old DICO Manual Thermostat with a new
Programmable HoneyWell RTH230B. There doesn't seem to be a model,
part, or serial number on the old thermostat, so I can't locate any
information on it via the Web (If you remove the fact place the
following numbers are stamped on the wall plate: 8639 E6 4). At any
rate, there are 4 wires going into the unit from the wall...they are
red, blue, green and white. Can anyone help me figure out which wire
goes to what? Thanks in advance...

http://toad.net/~jsmeenen/wiring.html

Note that color coding assumes that the installer followed the
standards. Many don't. If you aren't sure then check the thermostat
wiring where it connects to the air handler / furnace to be sure.

wrote in message
ups.com...
Hello, I'm trying to replace my old DICO Manual Thermostat with a new
Programmable HoneyWell RTH230B. There doesn't seem to be a model,
part, or serial number on the old thermostat, so I can't locate any
information on it via the Web (If you remove the fact place the
following numbers are stamped on the wall plate: 8639 E6 4). At any
rate, there are 4 wires going into the unit from the wall...they are
red, blue, green and white. Can anyone help me figure out which wire
goes to what? Thanks in advance...

How do you know if the Honeywell is even correct for the application?

4 wires could mean a plethora of different systems. Best to trace the wires
down and see what they do before you go much farther.

SQLit wrote:
How do you know if the Honeywell is even correct for the application?

As long as it isn't a HP, he's probably OK with that model.

http://customer.honeywell.com/Techli...0s/69-1800.pdf

On 29 Oct 2005 11:19:18 -0700, wrote:

Hello, I'm trying to replace my old DICO Manual Thermostat with a new
Programmable HoneyWell RTH230B. There doesn't seem to be a model,
part, or serial number on the old thermostat, so I can't locate any
information on it via the Web (If you remove the fact place the
following numbers are stamped on the wall plate: 8639 E6 4). At any
rate, there are 4 wires going into the unit from the wall...they are
red, blue, green and white. Can anyone help me figure out which wire
goes to what? Thanks in advance...

I need a lot more info than you give here is this Heat/Cool? I need
model and serial of all units.
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