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Need Recommendation for Electronic, Non-Prgmble, 2-wire, 24V T-stat w Cycle Rate Adjustability
While I was able to adjust our old White-Rodgers t-stat anticipator, it appears my old Honeywell MagicStat32 is on its way out, 30 yrs old etc. Shuts off after two minute cycle. Somehow the room temperature reaches setpoint and shows it on Temp indicator. Don't know how that's possible unless heat is coming from large 1.25" uninsulated pipes just below in basement boiler room. The anticipator screw is supposed to be turned one revolution counterclockwise for hydronic cycles, but screw falls out if I loosen that much.
Anyway, wondering what the recommendation would be for an Electronic, Non-Programmable, 2-wire, 24V w cycle rate adjustability. Most of the simple ones don't have all this. Don't really need programmable as with our new properly sized boiler there will be no setbacks. But want it to run with 24v with battery backup.
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In my current setup I have a Lennox iComfort stat for the heat pump, ended up adding a T4 because I would have to give up communicating AHU features to go to a hardwire interface for dual fuel.
I also use the heat pump as a passive backup, setpoint set much lower, in case the boiler fails while I’m away from home, I’ll at least get enough heat capacity for freeze protection. It held 54F indoors when it was -10F outside 2 winters ago when my power damper failed when I was on vacation.
System type #3 is for 'Heat Pump, Hot Water or high-efficiency furnace. greater than 90% efficiency. I chose that one since it mentions hot water, though I have an atmospheric boiler. What would the cycle rate or anticipator difference be?
if you blanked off the numbers and just put
WARMER < A B C D E F > COOLER
on thermostats, there would be a lot less discussion on numbers and more on how comfortable you are.
The discussion might be more like this:
"Honey are you a little cold?"
"Yea"
"Can you check the thermostat?"
"It is between C and D"
"OK put it on C please"
"done"
"lets see how we feel in an hour"
But with the numbers it goes more like this:
"Honey are you a little cold?"
"Yea"
"Can you check the thermostat?"
"It is set on 68 but the temperature reading says it is 67"
"Well that not right"
"I'll call the service man"
"He will have to come out to fix it and I will complain about the bill when he says there is nothing wrong"
"that sounds like a great idea"
"That is why the numbers are on the thermostat in the first place...right?"
"Sure is!"
"By the way, if we turn the thermostat up to 70, we might feel warmer but the gas bill will be higher"
"I think we should leave it at 68 and complain to the the service company for overcharging us for a service call and telling us there is nothing wrong."
"Yea... Nothing wrong service calls should be free... right?"
Similarly, forced air gas furnaces are often oversized with poorly laid out and installed ductwork. Also can overshoot by a lot.
> But thanks I'll check out T6 --as long as it can work with two wire, 24volt with battery backup.
Yes, it takes 2 AA batteries. With a 2 wire hook up, I'm assuming R and W. It is a 24v thermostat, but with your configuration, its not "24v powered". You would need a third wire to make a Common (ground) side of the circuit. Hence the need for batteries in your case.
1. Heating system type: I have atmospheric boiler; their choices are conventional forced air, heat pump, radiant.
2. Heating equipment type: gas forced air, hi eff gas forced air, oil forced air, electric, hot water fan coil; air to air heat pump, geothermal heat pump, hot water radiant heat, steam.
3. Adaptive intelligent recovery: If I am using non-programmable--meaning same temp 24/7, then this may not apply since there is no setback to return from?
4. The 12 heating cycle stages would seem to be where I could control length of cycle and degrees from target temp that would start call for heat.
Right now even on a cold day the zone in question has 3 hours between cycles, so hopefully that can be corrected to hourly.
Heating System Type will be Radiant. I guess they're covering all hydronics in one word.
Heating Equipment Type will be Hot Water Radiant Heat. To start anyway. We'll come back to this.
The Adaptive Intelligent Recovery option will be deleted once you make it non programmable.
The Heating Cycle Rate I think you're referring to (#ISU 370) is not an option with your system so it will be deleted from the set up as well.
Heating Equipment Type (#ISU 205) will play the role of anticipator or CPH setting. The numbers don't correspond to CPH but you can play with the numbers if Option 9 doesn't work for you.