Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
If our community has helped you, please consider making a contribution to support this website. Thanks!
Best Of
Re: Inquiry sent to Xylem today - Update with new circ (Grundfoss Alpha)
At 120F the valve starts modulates and you can see bypass flow start dropping, system flow starts moving. At 140F bypass is 100% closed, all system flow.
I did some adjusting and got almost 13 gpm, so over 6 fps
I have a short loop, so this happens quickly. Pump noise, boiler ramping up noise, but nothing I can hear in the valve?
I'll still try a delta P circ to see how flow responds as the valve modulates. But as one port closes the opposite opens that amount, so there is no increase in delta P I suspect.
I did some adjusting and got almost 13 gpm, so over 6 fps
I have a short loop, so this happens quickly. Pump noise, boiler ramping up noise, but nothing I can hear in the valve?
I'll still try a delta P circ to see how flow responds as the valve modulates. But as one port closes the opposite opens that amount, so there is no increase in delta P I suspect.
hot_rod
1
Re: Two quotes for combi boilers for radiant and DHW
We did a job in a small space like yours in Novato. The V. boiler had sooted up and was spewing carbon monoxide and we installed a Lochinvar heating only boiler in its place. Above it was a shelf with an on-demand heater for the DHW. Broke all the rules.
Eating & Cooling: Informal Breakfast Meetup AHR Expo 7:30 Tues Jan 23@Spoke & Bird 205 E18th
We try to find a decent place decently close to the conference. Last year at Rosie's in Atlanta @EdTheHeaterMan held court with a half dozen other wallie's. This year at the Spoke and Bird, 1/2 mile from the Hyatt Mccormick Place, you're the star. And you want to be around the show Tuesday Morning anyway when Coffee with Caleffi features some Heating Helpers at 11.
The Spoke and Bird
205 E18th Street
Chicago, IL
RSVP on this thread so I can try to block out enough seats.
directions or getting together at the show anytime text 401-439-7877
Brian
The Spoke and Bird
205 E18th Street
Chicago, IL
RSVP on this thread so I can try to block out enough seats.
directions or getting together at the show anytime text 401-439-7877
Brian
Re: pressuretrol problem
Thank you all for your feed back, but the solution was replacing the pressuretrol again for New i fought with the manufactor they gave a case number and went and installed new. so finally the 3rd one worked which is what i thought nothing wrong just poorly made control, had me second guessing something i was doing wrong but nope heat running and working just fine. i skimmed another time just because i had time and so far working like a charm. again thank you gentleman and fellow hvac/ plumbers for your help.
John732
1
Re: NEST With Two Wires
Hello @John732,
Actually reducing the Voltage @SteveSan is referring to gets more of the 24 VAC to the NEST.
Maybe think of it like this; With thermostats R wire is hot, C wire is common, neutral or low, the W wire is switched R wire. If a two wire NEST setup is calling for heat, R wire is connected to the W wire. The load, the heating equipment is between W wire and C wire.
The NEST charges during the idle time (no call for heat). With a thermostat switch open circuit the W wire is pulled low to the C wire (resistance of the heating equipment). However the NEST is drawing current through the load to charge so the voltage is raised on the W wire by the NEST charging current. The NEST helper resistor helps keep the W wire voltage low or closer to the C wire, so no false calls for heat and more charge current for the NEST. The lower the value of the helper resistor the lower the W wire voltage will be. The side effect is the lower the NEST helper resistance the more power is dissipated by the resistor during a call for heat, thermostat switch closed, since 24 VAC is now across the NEST helper resistor.
Actually reducing the Voltage @SteveSan is referring to gets more of the 24 VAC to the NEST.
Maybe think of it like this; With thermostats R wire is hot, C wire is common, neutral or low, the W wire is switched R wire. If a two wire NEST setup is calling for heat, R wire is connected to the W wire. The load, the heating equipment is between W wire and C wire.
The NEST charges during the idle time (no call for heat). With a thermostat switch open circuit the W wire is pulled low to the C wire (resistance of the heating equipment). However the NEST is drawing current through the load to charge so the voltage is raised on the W wire by the NEST charging current. The NEST helper resistor helps keep the W wire voltage low or closer to the C wire, so no false calls for heat and more charge current for the NEST. The lower the value of the helper resistor the lower the W wire voltage will be. The side effect is the lower the NEST helper resistance the more power is dissipated by the resistor during a call for heat, thermostat switch closed, since 24 VAC is now across the NEST helper resistor.
109A_5
4
Re: Hoffman 2 Vents?
I attach again the Hoffman discussion of vacuum for one-pipe steam. On page 25 is where the suggestion is to put just one of their vacuum vents on just one radiator to see the effect. You could see the same effect by installing a valve on a radiator before the vent and just closing it when the boiler turns off, even though all the other radiators are still open vented. This is often dismissed here as can't possibly be much of an effect, and also that it somehow only applies to banked coal fires. I disagree and side with the dead men. There is nothing different about the physics when a fire is just reduced and increased or if it goes out completely temporarily and then turns back on.
PMJ
3
Re: Hoffman 2 Vents?
Hello @SteamCoffee,
I have a small one pipe system. I kind of like the idea of vacuum, lower boiling point, less air in the system so less oxygen, less corrosion, and maybe the steam will move faster since it is not pushing against atmospheric pressure. However I understand there may be balancing issues if there is any leaks.
My system has a variety of vents Hoffman, Dole, Dole vacuum vent and it does drop into a slight vacuum when the burner stops that dissipates in a few minutes or so. One day I got the radiators good and hot, blocked off some but not all of the non-vacuum vents and shut off the boiler, the vacuum was deeper and lasted much longer. Some day I will block off all of them and see what happens. 2 of the vents are hard to get to.
I have not really noticed any greater heat output with the vacuum vents as compared to the other various vents, but never really focused on it either.
If my system seems to hold a vacuum between cycles I will probably build this valve and install it on all the vents.
The funny thing the old commercially made vacuum vents typically used a thin metal plate to trap the vacuum. I kind of thought with a mix of vents in the system it may take a bit more pressure to lift the metal plate so the non-vacuum vent vents may vent faster, just a theory of mine.
I have a small one pipe system. I kind of like the idea of vacuum, lower boiling point, less air in the system so less oxygen, less corrosion, and maybe the steam will move faster since it is not pushing against atmospheric pressure. However I understand there may be balancing issues if there is any leaks.
My system has a variety of vents Hoffman, Dole, Dole vacuum vent and it does drop into a slight vacuum when the burner stops that dissipates in a few minutes or so. One day I got the radiators good and hot, blocked off some but not all of the non-vacuum vents and shut off the boiler, the vacuum was deeper and lasted much longer. Some day I will block off all of them and see what happens. 2 of the vents are hard to get to.
I have not really noticed any greater heat output with the vacuum vents as compared to the other various vents, but never really focused on it either.
If my system seems to hold a vacuum between cycles I will probably build this valve and install it on all the vents.
The funny thing the old commercially made vacuum vents typically used a thin metal plate to trap the vacuum. I kind of thought with a mix of vents in the system it may take a bit more pressure to lift the metal plate so the non-vacuum vent vents may vent faster, just a theory of mine.
109A_5
3
Coffee With Caleffi LIVE at AHR on January 23
Our friends at Caleffi are hosting a panel discussion starring PME's "Next Gen All-Stars" and Carlson-Holohan Industry Award of Excellence Honorees.
AHR Expo, Chicago (Booth #S7981)
Tuesday, January 23
11 - 11:45 AM CST
Register here!
What happens when you mix PM Engineer’s “Next Gen All-Stars” with a seasoned group of Carlson-Holohan Honorees? Get ready to be inspired by a thoughtful interview from a selection of Next Gen All-Stars as the Honorees reminisce about the start of their careers, share memorable and applicable lessons learned along the way, and shed light on the secrets to their success. Take a look at our All-Star roster!
Starring:
Carlson-Holohan Honorees including founders Robert Bean* and Dan Holohan, Dave Yates, John Barba*, Ingrid Mattsson, John Siegenthaler, John Goshulak, Bob "Hot Rod" Rohr and David Hughes. (* pending AHR schedule)
BNP Next Gen All-Stars including Cody Mack (2022), Hannah Weir (2023) and Max Rohr (2023)
Carlson-Holohan Industry Award of Excellence: In the spirit of Gil Carlson and the vision of Dan Holohan the award was conceived in 2006. Every two years an individual from the United States or Canada who have demonstrated their passion for hydronic technologies manifested through education, marketing and philanthropy is selected by the inductees and presented with a replica of a Bell & Gossett System Syzer wheel invented by Carlson. The unique circular slide rule calculates the relationship between flow rate, temperature change and heat transfer rate.
Register to Win:
Register for free and join us to receive your limited edition Caleffi Gold Standard camo hat! (Limit one per registrant, while supplies last.) Simply show your digital or printed ticket after the Coffee with Caleffi LIVE session.
All attendees of Coffee wtih Caleffi LIVE events qualify for an opportunity to WIN a one-of-a-kind custom sculpture by Bob "Hot Rod" Rohr. The drawing will take place on Wednesday, Jan. 24 at 11 am.
And, The Caleffi Gold Standard Kit will be raffled during Bridging the Knowledge Gap event. Don't miss out!
Enjoy:
During Coffee with Caleffi LIVE, be sure to enjoy a specially prepared cappuccino, espresso or latte, made-to-order by our barista.
All this at Booth S7981 on Tuesday, Jan. 23 at 11 AM CST. Register today!
Re: The Mysterious btu
When you are in the freezer aisle and feeling cold because the heat in your body is going to the ice cream case. Your heat is warming up the ice cream and the freezer is pulling the heat out of the ice cream that you added.
Then thru the refrigeration process your added body heat is discharged outside into the parking lot and possibly helping melt the ice out there. There is another 30% or so of heat delivered outside because of the heat of compression involved in the refrigeration.
So just looking at the ice cream you have been involved in climate change!
Then thru the refrigeration process your added body heat is discharged outside into the parking lot and possibly helping melt the ice out there. There is another 30% or so of heat delivered outside because of the heat of compression involved in the refrigeration.
So just looking at the ice cream you have been involved in climate change!
JUGHNE
1
Re: A Bastian Morley Boiler
For those interested, the Bastian Morley boiler fired right up today after a slew of new parts.
SgtMaj
1