Attaching lawn irrigation timer to hvac thermostat for fan
 

Help please! I would like to attach a lawn sprinkler irrigation timer
to my thermostat so that I can automatically run the fan (without a/c
or heat) for air circulation at various times of the day.

The reason for attempting to use an irrigation timer is that,
apparently, even if I upgrade to a digital/timer thermostat, I still
can't control the fan alone. (My current thermostat is an old-style
White-Rodgers.)

The irrigation timer outputs a 26v signal (which in normal usage goes
to a solenoid in a water line valve)....can I just run a wire from
this port and splice it into the green (fan) thermostat wire (which I
believe is 24v)?

And what about the 'common' connection? I certainly need to connect
the irrigation timer's com port to another colored wire coming out of
the thermostat. (I know nothing about wiring/electricity as you can
tell.)

Thanks in advance for any help and comments.

Attaching lawn irrigation timer to hvac thermostat for fan
 

"iamdsc" wrote in message
...
Help please! I would like to attach a lawn sprinkler irrigation timer
to my thermostat so that I can automatically run the fan (without a/c
or heat) for air circulation at various times of the day.

The reason for attempting to use an irrigation timer is that,
apparently, even if I upgrade to a digital/timer thermostat, I still
can't control the fan alone. (My current thermostat is an old-style
White-Rodgers.)

The irrigation timer outputs a 26v signal (which in normal usage goes
to a solenoid in a water line valve)....can I just run a wire from
this port and splice it into the green (fan) thermostat wire (which I
believe is 24v)?

And what about the 'common' connection? I certainly need to connect
the irrigation timer's com port to another colored wire coming out of
the thermostat. (I know nothing about wiring/electricity as you can
tell.)

Thanks in advance for any help and comments.

No, what you propose will not work, and it will surely fry something!

You can buy thermostats to control the fan. I have one on my wall right now,
and the last thermostat I had did too. Many programmable residential 'stats
will give you four time settings a day, allowing two separate periods to
control the fan. The temperature set points can also be set up or down at
these times.

Honeywell manufactures a nice touch screen thermostat, TH8000 Vision Pro
that will do what you want, plus it can run the fan in a setting where it
will cycle the fan 20 minutes and hour IIRC.

There is no need to cobble something together!

http://yourhome.honeywell.com/Consum...RO/Default.htm

Greg

Attaching lawn irrigation timer to hvac thermostat for f
 

Thanks Greg for your prompt reply. I will check out the Honeywell
solution. (I had earlier talked to the company with whom I have an
a/c maintenance contract, and they had no clues how to help me!!!)

Attaching lawn irrigation timer to hvac thermostat for fan
 

"iamdsc" wrote in message
...
Help please! I would like to attach a lawn sprinkler irrigation timer
to my thermostat so that I can automatically run the fan (without a/c
or heat) for air circulation at various times of the day.

The reason for attempting to use an irrigation timer is that,
apparently, even if I upgrade to a digital/timer thermostat, I still
can't control the fan alone. (My current thermostat is an old-style
White-Rodgers.)

The irrigation timer outputs a 26v signal (which in normal usage goes
to a solenoid in a water line valve)....can I just run a wire from
this port and splice it into the green (fan) thermostat wire (which I
believe is 24v)?



Drop a few bucks and get a VisionPro Thermostat from Honeywell. It has a
'circ' feature to randomly turn on the blower.