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Short Cycling in hydronic system
We are recent owners of a 1900sq ft home built on two levels that has
hydronic radiant floor heating on both levels, embedded in concrete
floors. The system runs with a natural gas fired Viessmann Vitogas 50
cast-iron atmospheric boiler and a Tekmar 360 digital mixing control with
associated pumps and sensors. We have only been in this home less than one
year so it is our first experience with high mass radiant floor heating
this winter. (Our winter is southern Vnacouver Island, temperatures
normally above freezing at their coldest and now getting up to about 8 deg
C during the day).
Before I call in the experts I wonder if there are any on this newsgroup
who might give me some advice on our system. The boiler seems to me to be
cycling too often. During the night the boiler will fire for about 3
minutes every 8 minutes, sometimes even more frequently. This seems to me
to be very rapid cycling given that the water in the radiant floor pipes
is unlikely to be cooling down that rapidly??
Is this sort of cycling of the boiler normal? If not, what adjustments
can be made to the mixing control to reduce the on-off cycle without
affecting system efficiency?
Any ideas greatly appreciated.
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