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Tekmar 561, high mass radiant, Tekmar 260. Will it short cycle the boiler?
I'm finalizing all the updates to our heating system, and one piece of that is to install a 561 thermostat on the radiant zone.
My understanding is that the 561 has a setting for radiant flooring that uses PWM to modulate the pumps on and off in one minute or so bursts to keep the floor temperature relatively constant once it comes up to temp.
I plan to connect the 561 to a 260 with ODR, which should (I think) work to keep the boiler operating in an efficient range for the radiant needs (supply temps of 100-140 degrees through a mixing valve).
Will the boiler short cycle when the 561 goes into PWM? If it only calls for heat for a minute, with the 260 be smart enough to heat a full differential cycle, or will it shut down once the call for heat goes away?