Night setback in BB systems

tbuck

I have a customer with a new home. Baseboard on the main floors is sized 15% over design requirement. The homeowner wants to set back from 68 to 58 at night and can't understand why the house is not back up to 68 within an hour or 2. His last house was wall to wall BB.

Does anyone know/have an article or resource addressing this? I've been searching and can't come up with anything that explains why you don't set back baseboard more than 4 or 5 degrees.

Dave Yates (GrandPAH)_2

opportunity knocking

maybe

If they're using outdoor reset, then thermostat reset won't work as expected. If not and the boiler bounces off of its upper limit during operation, how quickly does it achieve that upper limit when recovering from thermostat setback? If that's fairly early in the recovery cycle, then they have a number of options:

* live with it and learn the reset curve recover time and program accordingly

* or - better yet - you can offer to install accessories that effectively oversize the heat emitter side so that recovery can be swift and, as a great side benefit, the overall temp required for maintaining comfort can be much lower - think modcon low. If modcon low, then why not flat panel rads to compliment the BB and look for radiant (not suspended or staple-up) opportunities.

* that leads to their second comfort issue and energy use - domestic hot water. Offer up a nice indirect or tankless unit.

$olution$