Need Thermostat Recommendation?

Yellowlab

Conditions:

1940's home with little insulation; formerly heated with coal, and plumbed with large dia piping and ci radiators. Currently with Am Stan GPM A-34 1BJ1 gas fired boiler. Unit uses a hi-limit switch and circulator. Thermostat is Honeywell digital: T8775A1009. Tried all dip switch settings and operates best set to "Steam/Gravity)

Operation is such that boiler starts cold (I know…this is NOT good…but a condition inherent to the house/piping). e.g. - Thermostat set to 70…outside 40…thermostat calls for heat (even though still reading 70)…boiler fires and runs 20 mins…radiators sufficiently warm and boiler shuts down (digital does not appear to undershoot or overshoot remaining at 70).

Need a stat with better cycle control…very grateful to anyone that can contribute their expertise.

p.s. - not a tech…limited experience, but can grasp concepts.

THANKS!

HotRod1975

that’s a great question. Because I have this in my grandparents house that I’ve basically taken over and the heat just goes and goes. It has some red and blue clips and have no clue how to set it.
if there was a way to set my Therm at 70 and to have 2-3 cycles of 15-20 mins

On and 15/20’off would be amazing is that possible???? And if so

Which thermostat I will run to

The store

Jamie Hall

https://forum.heatinghelp.com/discussion/202548/need-thermostat-recommendation

I'm not quite sure what you mean by "better cycle control". If the space temperature is staying constant within a small range, and the boiler is turning on and off to keep it that way, what's not to like?

ratio

https://forum.heatinghelp.com/discussion/202548/need-thermostat-recommendation

Sounds like it's working the way it should? Is there a complaint, "it''s too hot/cold" or "uses too much fuel"?

NB: ALL digital thermostats lie about the actual temperature. The temperature HAS to drop for them to realize it's time to turn on the heat, and the temperature HAS to rise for them to realize it's time to turn off the heat. If those on and off points are closer than a few degrees F, the system will just cycle itself to death, further apart is better from an efficiency standpoint (but not comfort).

Yellowlab

Thanks for helping me to better understand. (cycle control might not be the best choice of words). I think the fuel/comfort balance is the devil. As system operates now the radiators are virtually cold to touch between "cycles".

EBEBRATT-Ed

@Yellowlab you could put an outdoor air stat to control the circulator. When the temp outdoors drops into the 40s (adjustable) you bring on the circulator and let it run. Control the burner with the thermostat and lock the circ on when the stat is calling.

Circ does not use much power and comfort will be more even. Also you should have boiler return water temp to prevent condensation if needed.

Yellowlab

Boiler condensation is and has been a real concern.

EBEBRATT-Ed

Thats a problem that can be solved with a 3 way valve

Yellowlab

I will research Ed. I can take this suggestion and research…far from a pro, but with help from guys like you I can put the pieces together. THANKS!