Best Of
Re: Is this a hercules coal furnace ? What is this ?
Me too. My grandparents had one alongside their coal fired gravity hot air furnace.
Pumpguy
Re: Replacing pressure reducing valve
but if there is already a trap on the line, you don’t want a second trap
Find where that line ends up. If in fact you add a trap, by code and for proper operation it needs to be vented
hot_rod
Re: Why don't we pump away from expansion tank on dhw recirc systems?
Probably the simplest reason is that as many have implied there is very little if any chance of the pump cavitating, never mind pulling air. It would be a very rare domestic water setup which had a static pressure less than around 20 psig; 30 psig would be more normal. With that much static pressure you would need 60 feet of head loss or more between the expansion tank and the pump inlet to get in trouble. Not going to happen…
Re: Need help with new install of radiant with Buderus cast iron boiler
A Tekmar 256 will provide ODR for the boiler. Using the manual 4way valve that hot_rod posted will allow you to mix down for the radiant.
Set the ODR at 130-160* to begin and adjust the 4 way to achieve 75-100* going to the radiant. In other words, a parallel shift. This is a suggested starting point, some tweaking may be necessary.
Leave the indirect in the boiler loop, but you should add a domestic tempering valve to prevent scalding. You won’t need to hold the pump off on the boiler side if you let the indirect’s aquastat call the boiler on. Let your room thermostat control the radiant pump.
Pipe like this:
The indirect would be piped after (down stream) of the boiler pump, but before the closely spaced Tees. The expansion tank should be before (upstream) the boiler pump. This is also where you want your air eliminator (MBR).
Ironman
Re: Disgusted by today's electricians, Today's rant
I only did HVAC work, mostly oil burners, when I started in this trade. Many of my customers were shocked when they found out I didn't have an electricians' license.
Re: Disgusted by today's electricians, Today's rant
It's rough out there, and getting rougher. Two days ago, I had to rewire a new 277 volt exhaust fan where Sparky had taken the feed from one leg of the old 3 phase power to the old starter, fed from the switchgear—but then picked up the neutral from a nearby panel. This is the guy who kept pulling off this job to go work in a hospital.
Whiskey Tango Hotel.
ratio
Re: 60 PPM outside of "snowman" boiler
gA
Gas companies are #1 on my CO ignorance list. A fart could make his meter read 60ppm. The test must be done in the flue ahead o dilution air. Any other test is useless.
Re: Hodge Boiler Plant Photo (1890s)
Sorry to derail further, but I just sat down and watched the second half of the Bulding of the Eiffel Tower on television. As I understand it, a top notch riveter could install 1700 rivets per day (up to 12 hours). There are two and a half million rivets in the tower. Riveters were paid seventy cents per hour, almost double what riveters received at other less glamorous sites. They used sixty-six tons of paint when they repainted the tower for the nineteenth time recently. I apologize for the almost worthless information.
Re: Need help with new install of radiant with Buderus cast iron boiler
I had thought of the same thing that Kaos just suggested. The possible downside might be from the 3/4” coil in the indirect, but if the heat load is only 40k btus, that shouldn’t be an issue.
Ironman
Re: Need help with new install of radiant with Buderus cast iron boiler
No kidding, I'm down in Cuba, like an hour south of Orchard Park.
Are you taking DHW into account for the heat load? I planned to use the indirect for that.
Last year when I had deeper pockets I had the local HVAC company build me a quote for a modcon combi boiler setup, and based on all of my specs they recommended/quoted a 115k BTU unit. So I figured I'd be in the ballpark with the output of the Buderus.
My wife was unexpectedly unemployed for 7 months. We have 2 kids in college. She is back to work now but we are still playing catch up with tuition payments hence the low budget.
