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2 Questions (Outdoor Reset, Short Cycle)
Boiler Triangle Tube Solo 110
Re: Outdoor Reset Sensor Accuracy
Does anyone compare the reading from the outdoor sensor with the actual outdoor temperature and make sure they are close? (within a degree or two) Checked mine a month or so ago when we started needing heat and the house seemed kind of cool. Found the outdoor sensor reading a consistent 6 to 8 degrees F higher than the actual temperature. (checked the temperature at the sensor location with a digital and outdoor dial thermometer which read within a degree of each other while the outdoor sensor was reading 6 to 8 degrees higher. Have done this several times over the last month, always with the same result.) I am assuming that this will make the “Target” temperature for the boiler lower than it should be since the sensor thinks the outdoor temperature is warmer than it actually is.
Short of changing the sensor, would raising the Reset Curve for Coldest and Warmest Day by 6 to 8 degrees compensate for the difference or would this cause some other problem that I’m not seeing?
Re: Short Cycling
Changed my primary zone pump from a Taco 007 to a 008 dT set to 20 degrees. When I did, I checked with TT Tech support to see if it the internal circulator setting should be changed. It is currently on the highest setting and he suggested leaving it there to prevent flashing in the heat exchanger. Except on a DHW call which maintains a 40 gal indirect tank, the system short cycles. Will be adding some high output baseboard to the system next year which should help but until then was wondering about the options. The CH Post Pump Time is currently set at the default of 1 minute. The boiler is firing for about a minute, getting the return temperature a couple of degrees above the target temperature and shutting down. The circulator continues to run and about 1 minute later the burner begins the firing sequence again. Since the burner won’t fire during the Post Pump, was thinking of extending the Post Pump time to 3 to 5 minutes to see if I can get a larger drop in the return
temperature and a longer firing time on the burner when it does fire. And again, could this cause any problem that I’m not seeing?
Any better (no cost) options than what I’m thinking.