| General > General Technical Chat |
| Honeywell furnace flame detector |
| << < (5/7) > >> |
| WattsThat:
It might be by state here in the US. As mentioned, there are online dealers that sell boilers and other gas oil fired devices that don’t appear to have any licensing requirements, I’ve had no issues buying boilers in PA. Not shilling for them but I buy often from SupplyHouse dot com as service and prices are great and UPS ground has stuff here next day. Ordered a new ignition transformer for my oil burner last Friday at 5pm, they said it would be delivered Monday. UPS dropped it off Saturday due to the holiday work load. Gotta luv it when online commerce works well. The walk-up plumbing and hvac supply houses can all go suck an egg, they’ve done it to themselves by gouging non-trade walk-ins. My local Ace hardware has 90% of what I need most of the time and their prices are in line with the big box stores so that’s where most of my local biz goes, to someone in my community that I know and he employs 20+ full time people. The odd ball stuff goes to the specialty online retailers. |
| james_s:
--- Quote from: NiHaoMike on December 12, 2021, 02:53:41 am ---What license is needed to buy a residential gas furnace? Split heat pumps and A/C units just need EPA 608, which is pretty easy to get. A good book would be "Modern Refrigeration and Air Conditioning". --- End quote --- Walk into any HVAC supply house with your EPA 608 card (got mine 20 years ago) and ask to buy a furnace or split system, let me know when you find one that will sell to you. Every local HVAC supply house I'm aware of requires you to have a contractor license and be a professional HVAC installer. They will not sell to individuals, period. |
| jmelson:
--- Quote from: floobydust on December 09, 2021, 04:44:01 am ---Generally speaking, you are applying HV AC to the kanthal rod and looking for the rectification property of the flame. This is thermionic. Excitation is around 50-100VAC and very low current under 10uA. Older equipment used mains sine-wave and modern gear uses a square-wave driven by MCU as safety codes require a lot of self-test for flame detection circuit. The rod must not have soot etc. buildup which is easily cleaned off with steel wool. Also, any leakage current to ground due to rust or soot, or shoddy/melted/wet wiring or cracked porcelain can be a problem. Note this leakage does not count as a false-positive for flame present because it's just an ohmic resistance seen and not rectification. --- End quote --- First time out there, I cleaned the rod with what I had available (cloth), and put it back in. Worked fine for a week. Now, armed with knowledge of what to do, when it started going flaky again, I cleaned the rod with sandpaper. Before, the flame LED blinked twice before going solid on when the flame started. After sandpaper cleaning, the LED goes to solid on immediately when flame starts, no blinks. Thanks, guys, for the help. Jon |
| NiHaoMike:
--- Quote from: james_s on December 12, 2021, 06:56:20 am ---Walk into any HVAC supply house with your EPA 608 card (got mine 20 years ago) and ask to buy a furnace or split system, let me know when you find one that will sell to you. Every local HVAC supply house I'm aware of requires you to have a contractor license and be a professional HVAC installer. They will not sell to individuals, period. --- End quote --- There's plenty of split systems sold at Home Depot, some even include gas heating. Look at the details for one and I don't see any mention of license needed to buy. https://www.homedepot.com/b/Heating-Venting-Cooling-Air-Conditioners-Whole-House-Air-Conditioners/N-5yc1vZc4kd |
| james_s:
Interesting, I wonder if it varies by state? I've certainly never seen any on the shelves in the stores and the ones you can order are the same off-brands some of the online dealers sell cheaper. They do have a small HVAC display in the Home Depot near me but it's just a front for a network of contractors that install it. You can't just walk in and buy the equipment they have on display. The situation may be improving since the internet has made it possible to get this stuff, used to be the only places that sold it were HVAC supply houses. 20 years ago it was very difficult just to get a part like a gas valve or control board, now that part is easy at least. |
| Navigation |
| Message Index |
| Next page |
| Previous page |