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Honeywell furnace flame detector
SoundTech-LG:
The HVAC "pros" seem similarly determined to protect any possible "secrets" of the new "smart" thermostat installs. The manufacturers seem to refer customers to "pros" as well, rather than provide any details that might help a DIYer gain any insights. I have never dealt with any HVAC pro, and hopefully will never have to...
jmelson:
--- Quote from: SoundTech-LG on December 10, 2021, 04:22:46 pm ---The HVAC "pros" seem similarly determined to protect any possible "secrets" of the new "smart" thermostat installs. The manufacturers seem to refer customers to "pros" as well, rather than provide any details that might help a DIYer gain any insights. I have never dealt with any HVAC pro, and hopefully will never have to...
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Yes, they want LAWS to make it illegal to even change the furnace filter.
There was a proposed law that would require an electrician to change a burned-out light bulb and he would have to file for a building permit to do the work!
Amazingly, the state legislature didn't fall for it!
Jon
james_s:
--- Quote from: tom66 on December 10, 2021, 09:51:28 am ---Similar story with AC units in the UK. You can now legally buy mini-split units that contain propane as a refrigerant. It's not a gas that has a high GWP (global warming potential) or ODP (ozone depletion potential), so it's considered safe for consumers to handle with effectively zero training. Yes, it is flammable, but that is no different from a consumer setting up a gas barbeque/grill. Yet, reading on the AC repair/installers forums, they're completely up in arms over this clearly unsafe technology being accessible to every Joe with a hammer and drill. I will certainly be installing my own HVAC in my new home.
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The thing that blows a big hole in the hysterical rantings about safety is the fact that any consumer can walk into a hardware store, home center or plumbing wholesaler and buy a gas fired water heater off the shelf no questions asked. You cannot buy a gas furnace or boiler anywhere though, the hardware stores don't carry them and the HVAC wholesalers will refuse to sell to anyone who is not a licensed contractor because of "safety" and any number of other silly claims. They moan about hacks doing improper work, well duh, it's so hard to get hold of the parts and information to do the job properly so people make due with what they can get. Fortunately there are online dealers now that will sell to anybody, though information is still lacking. You can can easily buy a book that will teach you enough about nearly any trade to do the job properly yourself, except for HVAC. I have several good plumbing, electrical and carpentry books written by professional tradesmen that show a lot of the tricks and techniques. I am not aware of any good HVAC how-to books.
electr_peter:
This video is relevant to discussion on flame sensor Thermopile Testing, Construction, Current and Energy Harvesting
Actual power delivery and resistance is measured on good and faulty thermopile, teardown is done.
NiHaoMike:
--- Quote from: james_s on December 10, 2021, 08:18:02 pm ---The thing that blows a big hole in the hysterical rantings about safety is the fact that any consumer can walk into a hardware store, home center or plumbing wholesaler and buy a gas fired water heater off the shelf no questions asked. You cannot buy a gas furnace or boiler anywhere though, the hardware stores don't carry them and the HVAC wholesalers will refuse to sell to anyone who is not a licensed contractor because of "safety" and any number of other silly claims. They moan about hacks doing improper work, well duh, it's so hard to get hold of the parts and information to do the job properly so people make due with what they can get. Fortunately there are online dealers now that will sell to anybody, though information is still lacking. You can can easily buy a book that will teach you enough about nearly any trade to do the job properly yourself, except for HVAC. I have several good plumbing, electrical and carpentry books written by professional tradesmen that show a lot of the tricks and techniques. I am not aware of any good HVAC how-to books.
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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".
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