Best Of
Re: heat pump water heater with domestic coil backup
Thats just how I drew it. When I do it I'll make sure the expansion tank is below the shut off for the tank
Re: Blower motor shaking but not starting
Wow, what a difference! I definitely had the motor turning the wrong way. It sure blows out of the vents now!
I bought a voltage metre so would someone please tell me what I should be looking for?
Re: How efficient is my boiler? No really
I don't much care about the boiler rating. I care about the money I save. I leave the efficiency to the lab experts. I attribute the saving to the modulation and the outdoor reset features. God bless those engineers.
Now if they can only design a mod/con that last 40 yrs, but that would probably hurt their bottom line.
Re: Burner Cycle Time
you want to protect the boiler from thermal shock, most importantly. And ideally you would like nice long burner run cycles while maintaining return protection
Somewhere you will have to compromise. The heat load of the building is ever changing. If you were to adjust and install a bypass now in mild weather the dynamics will be different in full load heating conditions.
Lots of variables come into play. Is the boiler sized to the radiation? Is the radiation sized to the design load? Has the building or insulation changed since the install and calcs?
You may not gat a perfect long, efficient burn, in all load conditions regardless of the bypass, need to figure out all the variables.
The 10 minute minimun burn seems to be the number most of the respondents used when asked about cycling in the article. You should have good return temperatures in that time frame. Still think I would be more cocerned with the return temperature than the on / off cycle. Doilers will work with shorter cycles, drives me nuts, but plenty run their entire life short cycling. Low mass boilers do this commonly in low load conditions.
Sounds like you have a handle on the concept, but not quite sure how to fix it to you system. BP does a lot of these sucessfully, I'd use his method.
Here is a link to a B&G article on this subject.
http://www.bellgossett.com/press/thermalshock.htm
hot rod
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Re: Burner Cycle Time
http://www.pmengineer.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2732,90176,00.html
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Why your radiators aren't heating right, this weeks video
You could have the most efficient boiler in the world. If the rooms are still cold, it could be the baseboard radiation or radiators.
Geothermal Installation Video
finally pinned down the video man, got all the editing done. Tell me what you think
GW
Re: steam system tour
I've traced the 10/2 wire back to the panel and it is just dead ended inside of the panel so I'll pull out the 20 amp double pole breaker that used to feed the AC receptacle in the living room which never gets used (I have a 10K BTU window unit which is 120v now) and put in the appropriately sized breaker which is 30 amps. The 20 amp 240 volt receptacle in the living room that was for the air conditioner I've removed the receptacle and just put a blank cover plate over the box as well. I've already run a condensate line over to the sump pit with 3/4" PEX and I'm just going to use gravity to get it there. I've run it along the wet return for the steam system which never gets more than warm during an extended heat call. I think for me and my demand for hot water which is just a 10 to 15 minute shower once a day and load of laundry about once a week and running the dishwasher maybe once a week as well, running it in heat pump only mode or energy saver mode would be best for me. One of my friends who lives one town over and has eversource for electricity his only costs him about $5 or $10 a month in electricity. I think mine would be similar. My most expensive electric bill in the summertime is about $180 running a couple of window air conditioners upstairs set at 72° and I only run the one in the living room as needed.