Honeywell CT8775A 24vac help?
#1
Honeywell CT8775A 24vac help?
I have this t-stat and wondering how the wiring goes from the transformer to power on the t-stat since it doesnt have a battery. thanks
#3
Are you installing a new thermostat or do you have it already installed and just want to know how it works ?
If you are going to install one be sure to turn the a/c power off to the air handler/furnace.
When you remove the thermostat you must identify what color wire is on what terminal before disconnecting them. A picture is ok too.
That's a cool little thermostat. Pretty easy to program.
When the thermostat calls for heat it creates a short on the two heating wires and you get heat. When the thermostat is satisfied the contacts open and the thermostat is in series with the load and steals a little bit of power to keep the unit active.
If you are going to install one be sure to turn the a/c power off to the air handler/furnace.
When you remove the thermostat you must identify what color wire is on what terminal before disconnecting them. A picture is ok too.
That's a cool little thermostat. Pretty easy to program.
When the thermostat calls for heat it creates a short on the two heating wires and you get heat. When the thermostat is satisfied the contacts open and the thermostat is in series with the load and steals a little bit of power to keep the unit active.
#4
This is a new t-stat i'm using on a hot water loop in my basement. when i touch the ends directly to transformer it illuminates. some reason maybe not hooked up right between the boiler and transformer.?
The thermostat is just a basic 2 wire digital round non-programmable.
The thermostat is just a basic 2 wire digital round non-programmable.
#5
Yeah....and I posted easy to program I meant pretty easy to install.
What happens when you short the two wires out at the thermostat location ?
Does it activate anything or zone valve ?
What happens when you short the two wires out at the thermostat location ?
Does it activate anything or zone valve ?
#7
LOL. I wasnt sure if you meant same t-stat. well i have it hooked up into a Taco SR503. I want it to run zone 2. theres a 24vac transformer built in that and trying to get power from there for the t-stat.
#8
My ? is how come its not lit up when mounted on the wall.? got 2 t-stat wires going to relay/switch. well it works when plugged directly to transformer. i wanted to see since it was used and wasnt getting nothing on it there other way..
#11
No. There is a different type of voltage on those 2 wires at your thermostat location that go to the 503. The transformer is for something else. I can't remember. You can get it to work by installing a relay though.
#12
Oh cool. what kind of relay do i need? Part # if you have it. Also i'm hoping to hook up at HW L6006A to the 503 for my hot water loop. would that get hooked into that 503 box to? thanks