Best Of
Re: Underperforming system in cold temps
Just looking at the control module, multiple knobs, this boiler probably has ODR outdoor reset function. Is that being used, a sensor mounted outside on a north wall, for example? That would explain the varying SWT temperature
That control display screen or info screen should tell you boiler supply, boiler return, and maybe boiler target, the temperature it is trying to get to? The operation manual would tell you how to access that info. Those would be the most accurate measurements as they are usually probes into the fluid stream, not strap on.
In my mind if the 3 way valve has 110 or whatever in the H port, the mix port, or AB port should be able to see 110. There should be no blending if the valve closes off the cold, or B port?
If the thermostat satisfies before the boiler reaches the setpoint temperature, you may not see the target temperature being reached. The load is satisfied, the boiler should ramp down.
At days end, are you warm and comfortable now and at the coldest days? If so you may not need to screw with it?
hot_rod
Re: Circulator wiring with Taco SR504 switching relay
Just an update. Using the ZR terminal did the job. So much better than before. I believe I will save a lot on wood this way. Again thanks for everyone's support.
Re: Simple Steam Heat Thermostat Recommendations
I too have single pipe steam system and was able to get a mercury Honeywell T87 just before mercury was banned years ago. It has performed flawlessly for a few decades - set it and forget it for the most part. Its possible these thermostats can still be had on Ebay etc.
All the Best,
RTW
RTW
Re: Boiler Zone 2 won't ignite boiler
Holy Crap!!!
HVACNUT you have solved the puzzle! I flipped the switch to the damper and now it appears the system is working.
Why did flipping that switch work? It was opening on the first cycle.
Re: Underperforming system in cold temps
Does the supply pipe going into the mixing valve feel like it is 150F?
And is that the supply pipe coming from the top or bottom in that photo with the Taco mixing valve?
I don't see the "supply sensor" going into the taco mixing vavle. Is it just bent over and not visible in photo? where is that sensor on your piping? What is that wire nut connecting?
Looks like someone has been fairly aggressive with a screwdriver on that mixing valve.
bjohnhy
Re: Sight glass full, boiler cycles on and off every 30 seconds.
First step is to drain the water to an acceptable level. About halfway full, give or take. I guess would be that it's cycling on pressure, which is building up due to the excessive water levels.
Re: 2 out of 3 heating zones not working
UPDATE! Sorry for the delay. Checked voltage on transformer and zone valves all checked out at 24V and were operating . The expansion tank was shot and full of water so replacing that was a no-brainer.
The single circulator pump was suspected of not working. although I did have heat on 2nd floor on a short cycle basis. The pump was replaced 6 years ago so I was hesitant on replacing it. I checked voltage to the aquastat and had 120V on L1/2 and 25V on T/T but C1/2 had nothing and relay was pulled in so the thermostats were calling. So no power to the circulator. Drained the boiler down a bit, removed the 30 year old aquasat and replaced with a new "HydroStat". Bleed the whole system again (I'm really good at it now) and fired it up. BEHOLD! Let there be heat! With temps as low as -10 I am relieved. Having heat on 2nd floor must have been natural convection or something not sure. But it works now without short cycling.
THANK YOU to all who gave input and advice, I truly appreciate it .
tmtruett
Re: New Crown boilers - updated piping
Did they repipe it after they installed it or is that how they installed it? As I see it they used a cheap vent and didn't fix some issues someone in the past left behind. They didn't do the best job but didn't do an awful job either.
mattmia2
Re: Air to Water Heatpump scenario for my abode.
"With the swt hardly breaking 140 at designed would an a2w hp be viable with the rads that I have? "
There's the rub. Both the output and the COP really fall off the table at cold temperatures when you raise the water temperature.
Let me ask this: Do you have AC? Would you like to have AC? As a rough back-of-the-envelope guess, based on your heating load and the weather station data I'd say your cooling load is about 1.5 tons. I'd think about two heat pumps, an air-to-water that does most of your heating, an air-to-air that provides cooling in the summer and more heat when the air-to-water can't get the water hot enough in the winter.
The other option would be adding more radiators or other emitters.
Re: Even more steam system questions……
Glad I was able to locate it, and acknowledge that it appears to be functioning properly. At the same time I was able look at a few pipes and connections behind finished areas to check for leaks, which I did not see any. Finished it off with a small 8 x 12 access panel for future viewing.
geemalar