Mr. Grayfurnaceman, I would just like to say I appreciate your videos. Even though I don't work as a hvac tech, I went to school for it a couple of years ago. You are a great teacher, keep up the good work.
@@grayfurnaceman please never stop making video I am going through HVAC schooling and your videos have been a big help. I download all your HVAC videos.
What was the purpose of manufactures going from this type of draft to using the inducer type exhaust? Was it for safety reasons? Or is an inducer type more efficient? It seems that the heat exchangers became very thin compared to the exchangers in the natural draft units. I think it is great that you keep older furnaces to run and give examples! What is the oldest furnace you have? Thanks
Also folks if you have an older furnace like this especially in s confined space the bottom plate in the blower compartment must be screwed down or at least put a brick on it. If you have a side opening for the return. I saw a furnace come on and the pull of the blower lifted up the bottom plate and pulled in air from the room it was in plus from the draft hood and before you knew it it was making lots of CO.
I had a service call on a boiler today. The flame totally rolled out when I opened up the metal slide to view the flame. I noticed the boiler had quite a large draft hood. So I blocked it as a test and the flame was perfect. I took it off and the flame rolled out again. I also cleaned a bunch of soot from the burner section. Why would the flame go back to normal after blocking the draft hood?
grayfurnaceman yes. I ended up talking to another tech in my company who serviced this boiler before. He thinks that the flue is full of soot and needs to be cleaned. Thanks for the reply GFM! Ive learned so much from watching your videos.
Where is the inducer?...I can't find an inducer on mine either. I have a Grimbsy furnace or that's what it says on the front. I hear a loud buzzing motor for about a minute before the fan comes on then I don't hear it no more. I think its the inducer motor but I can't even find it. It needs greasing.
I have a furnace even older than this one. Its from 1954. Big blue housing. cast iron inside. Pilot always on. Everything operates but it is only sending out warm air. Not hot air like last winter.
Burner tubes are the devices that spread the flame across the heat exchanger. This is on older furnaces that used the ribbon type burner, not the inshot burners used now. GFM
So it sounds like back then they were more concerned about the burner continuing to burn than they were about carbon monoxide poisoning. They were more concerned about the flame rolling out then about people breathing that poisonous gas in. It would be better to have problems with your gas furnace then it would be to be constantly breathing carbon monoxide. Thank God people got smarter and came up with the inducer fan motor
As a practical matter, the draft hood appliances posed little danger as they would shut down if problems like draft hood spillage occured. That said, induced appliances are a better solution. GFM.
@@biblebloopers946 The recirculation of burned fuel from the draft hood entering the combustion air to the burners will shut down the burners and pilot flame. The lack of pilot will drop out the pilot safety. Shut down is not immediate as is newer flame rectification but when this technology was used, flame rectification technology was very expensive. The flame safety would cost more than the entire furnace at that time. GFM
Mr. Grayfurnaceman, I would just like to say I appreciate your videos. Even though I don't work as a hvac tech, I went to school for it a couple of years ago. You are a great teacher, keep up the good work.
This is the best explanation & demonstration of draft hood/draft diverter I have ever heard or seen. Great camera shots.
Thanks for the support.
GFM
Great vid. I would like to add that the vent also allows remaining gases to expel up chimney after the burners cut off.
Thank you for all your videos
Welcome
GFM
@@grayfurnaceman please never stop making video I am going through HVAC schooling and your videos have been a big help. I download all your HVAC videos.
What was the purpose of manufactures going from this type of draft to using the inducer type exhaust? Was it for safety reasons? Or is an inducer type more efficient? It seems that the heat exchangers became very thin compared to the exchangers in the natural draft units. I think it is great that you keep older furnaces to run and give examples! What is the oldest furnace you have? Thanks
Also folks if you have an older furnace like this especially in s confined space the bottom plate in the blower compartment must be screwed down or at least put a brick on it. If you have a side opening for the return. I saw a furnace come on and the pull of the blower lifted up the bottom plate and pulled in air from the room it was in plus from the draft hood and before you knew it it was making lots of CO.
I had a service call on a boiler today. The flame totally rolled out when I opened up the metal slide to view the flame. I noticed the boiler had quite a large draft hood. So I blocked it as a test and the flame was perfect. I took it off and the flame rolled out again. I also cleaned a bunch of soot from the burner section. Why would the flame go back to normal after blocking the draft hood?
I think you have a restriction in the venting above the draft hood.
GFM
grayfurnaceman yes. I ended up talking to another tech in my company who serviced this boiler before. He thinks that the flue is full of soot and needs to be cleaned. Thanks for the reply GFM! Ive learned so much from watching your videos.
You got it. In the simplest terms. As is the best way. Thanks for thoughts.
GFM
Where is the inducer?...I can't find an inducer on mine either.
I have a Grimbsy furnace or that's what it says on the front.
I hear a loud buzzing motor for about a minute before the fan comes on then I don't hear it no more.
I think its the inducer motor but I can't even find it. It needs greasing.
excellent explanation, thank you for your expertise...
Mr. Gray, where were you when I needed you 26 years ago in shop class huh? lol. Thanks.
Yes sir impeccable work
In simplest terms the draft hood disconnects the appliance from the chimney and the affects the chimney may have on the appliance
Great video 💯💯💯💯
I have a furnace even older than this one. Its from 1954. Big blue housing. cast iron inside. Pilot always on. Everything operates but it is only sending out warm air. Not hot air like last winter.
Another video mentioned a Spill Switch. Why doesn't this furnace have one? Something that came later?
+JustPlumDucky Spill switches were added on many units in later years. A good idea.
GFM
Burner tubes? Could you mean the heat exchanger?
Burner tubes are the devices that spread the flame across the heat exchanger. This is on older furnaces that used the ribbon type burner, not the inshot burners used now.
GFM
do all types of furnaces (forced air, boiler, etc) have draft hoods?...thanks...
pei bossman Draft hoods were eliminated on most units with the advent of the inducer fan, around 1990.
GFM
thank you...
Welcome
GFM
Thanks
This is similar to mine.
I don't like that open
So it sounds like back then they were more concerned about the burner continuing to burn than they were about carbon monoxide poisoning. They were more concerned about the flame rolling out then about people breathing that poisonous gas in. It would be better to have problems with your gas furnace then it would be to be constantly breathing carbon monoxide.
Thank God people got smarter and came up with the inducer fan motor
As a practical matter, the draft hood appliances posed little danger as they would shut down if problems like draft hood spillage occured.
That said, induced appliances are a better solution.
GFM.
@@grayfurnaceman what safety shuts off the natural draft furnace in the event of backdraft?
@@biblebloopers946 The recirculation of burned fuel from the draft hood entering the combustion air to the burners will shut down the burners and pilot flame. The lack of pilot will drop out the pilot safety.
Shut down is not immediate as is newer flame rectification but when this technology was used, flame rectification technology was very expensive. The flame safety would cost more than the entire furnace at that time.
GFM