Big_Jake wrote:

On Dec 26, 7:27 pm, "peter" wrote:

I have a thermostat/furnace combination that results in a hyper system --
sometimes the furnace turns on for a minute or less, turns off for a minute
or less, etc. This gets annoying.

I would like to reduce the frequency of switching on and off. In other
words, if it turns on, stay on longer. When it turns off, stay off longer.
This may results in more temperature fluctuation, which is ok.

So, is there a thermostat that allows me to control either: minimum on/off
duration or the on-temperature and off-temperature independently?

My temporary hack is to cover the thermostat with a box. This delays the
temperature change at the thermostat and lengthens the on/off cycle
duration. But I'd rather not have a box on the thermostat.

The current thermostat is a honeywell low voltage system, bought some 10
years ago.


I am surprised that nobody "has got it right" so far.

Many Honeywell thermostats cycle the furnace this way to "ease" the
temp up to the set point. The idea is to provide greater comfort
while not "overshooting" the temperature setting on the t-stat. My
"fancy pants" Honeywell VisionPro has a setting where you can choose
how many cycles per hour (max), to avoid really short cycles. I think
the current setting is 5 per hour. Yours won't have that option,
so...

I believe that the "work around" is to set the switches on the back
(If you have them) to "gravity hot water" which should defeat the
cycling completely. The trade off is that the t-stat might shut off
early, before it hits the set point, or it might overshoot the temp.
To me, I would rather lose a little comfort to keep the furnace from
cycling 50 times a day.

JK

5 an hour, or 50 a day, is a long way from once a minute. I suspect his
device is malfunctioning. Even 10 year old Honeywells were, I believe,
sophisticated enough to avoid such short cycles.

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