On 1/1/2012 6:50 PM, IGot2P wrote:
On 1/1/2012 8:09 AM, wrote:
On Jan 1, 12:24 am, Ignoramus21023ignoramus21...@NOSPAM.
21023.invalid wrote:
On 2012-01-01, Ed wrote:





On Sat, 31 Dec 2011 21:10:23 -0600, Ignoramus21023
wrote:

During the day, I want the temp to be 47 degrees, and at night, I
would be happy with 38 degrees or so.

Do programmable thermostats need a separate power supply, or can they
run themselves from just a pair of 24v wires that they open and close?

No wiring needed. Programmable stat use batteries to power the clock
but the same wires are all that is needed to make them work.

You will find that they have a minimum setting of 40 degrees. Yeah,
33 would save fuel, but 40 give a safety factor in case the heater
break down.

I've had good experience with Honeywell and White-Rodgers. We have a
couple dozen or so in our building.

And those, are two wire programmable thermostats with a battery?
Right?- Hide quoted text -

- Show quoted text -

Take a look at any of the programmable thermostats at HD or
online. Everyone that I've seen runs off batteries and will work
with a simple two wire connection. Some will
also use 24V, if available. Some also have an internal failsafe
switch that will close at around 40 or so in case the batteries
are dead. I'd check the min temp before you buy one. The
ones I've had for sure will not go down into the 30's. Think
45 might be the lower limit.
(snipped)

I do believe you are correct about the 45 degree F lower limit. I looked
all over a couple of years back to find one that would go down into the
high 30's with no success....45 was the lowest I could find.

Don


I have a Honeywell TB8220U1003 Commercial VisionPRO 8000 Touchscreen
Programmable Thermostat sitting here on the desk. It goes down to 40°F
in heat mode. I found it laying around in an electrical room where all
the separate thermostats had been removed to implement a remote
controlled energy management system. I put 3 AAA batteries in it so I
can use it as a thermometer and clock and the 3 1/2" X 2 5/8" LCD screen
back lights when I touch it. Just for giggles I looked it up and found
that it lists $439.29. Darn, this thing will do all sorts of stuff. o_O

http://customer.honeywell.com/honeyw...px/TB8220U1003

http://preview.tinyurl.com/7hhf2bj

TDD