Moved into a new house this summer, my first experience with hot water
heat. Ran it for the first time today. Took nearly an hour to go up 3
deg. to the set point, but after the thermostat switched the heat off,
temperature continued to go up another 4 deg.
Admittedly it is not so cold yet, 50F today, so that's one reason it
is flabby. Still, the previous owners used Honeywell MagicStats (two
for to jones with separate pumps but one furnace), and I'd like to
upgrade to something that might give me more settings to control. I
can't find a thermostat on the web where the description indicates
that it might be good for precise control of a slow, 'massive'
hydronic heating system.
I have read about controlling temperature using PID (proportional,
integral, differential). But home thermostats for non-electrical-heat
seem to be just on/off based on set point...or am I wrong? Some of
them do have something called "anticipation". To me, anticipation
means that the controller looks at HOW FAST the temperature is
changing, and if it is going up at a good clip, stops heating early in
anticipation of continued temperature rise (differential control). In
HVAC usage, however, it seems to mean the same thing as cycles/hour.
Why is cycles/hour called anticipation?