On Thu, 31 Jul 2003 21:25:47 -0400, Peter
wrote:
On Thu, 31 Jul 2003 18:07:44 -0500, jim wrote:
Peter wrote:
On Thu, 31 Jul 2003 17:18:34 GMT, "Travis Jordan" wrote:
Peter wrote:
I'd like to find out whether there is any "standard" to the wiring
between home thermostats and the HVAC equipment.
The thermostats in my house are connected to the HVAC units in the
basement via a 5 conductor cable. Yellow, green, white, red, blue.
The blue is not connected. I *assume* that two of the other four are
the main on/off and the other two are for the fan on/auto switch.
Can I tell by color which is which or do I have to open up the
thermostat and look?
Thanks.
Peter
Most installers adopt the commonly used 'standard' wire color code.
Here's a sample of some typical usage:
R Red - Power 24 VAC transformer
C Black/Blue - Common of 24 VAC transformer
W White - Primary heat call relay
E Brown - Emergency heat relay
Y Yellow - Primary cool call relay
G Green - Fan relay
O Orange - Change-over to cool relay
B Blue - Change-over relay to heat relay
Here's as much as you will ever want to know about the various
manufacturer's equipment-to-thermostat connections:
http://hbctechlit.honeywell.com/tech...0s/70-6627.pdf
So, which two wires are for the fan On function. Green is one, which is
the other?
In other words, if I wanted to run a jumper between two of the terminals
to force the fan to be On all the time (as if I put the fan switch in the
On position), which two terminals would it be? I assume one is where the
green wire is connected. Which is the other?
Peter
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dont think you have to run any jumpers.. just put the switch on FAN and
the fan stays on.. AUTO means automatic and the fan will come on when
the compressor comes on.... and will go off when the compressor goes
off.
hope this helps.
What I actually want to do is put in a second On/Auto switch for the fan -
in parallel with the existing switch. (Don't ask why.) One side of the
new switch should be wired to the green wire terminal. The other side of
the new switch wired to what???
Peter
This has reached the poin where you might want to take a look at the
furnace and see what wires go where at that end.