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Maximum duty cycle value for boiler/hydronic systems
I've noticed that during long periods of set-back recovery, the thermostat is calling for heat non-stop for a long time.
This runs the boiler to the point where the pressure is 30psi and the pressure relief valve starts dripping or sometimes the aquastat limit is reached and the burner turns off.
I've found the setting in the thermostat that allows for changing maximum duty cycle rate (100% now) and of course the cycle rate.
What are the proper settings for this type of system? I've also seen all kinds of suggestions for cph for hydronic systems from 6cph down to 2cph. Is there a definitive guide for these settings? I'm now curious to know for forced air and heat pump types as well.