How the draft hood on the gas furnace works

Подписаться 158 тыс.

Просмотров 38 тыс.

50% 1

A demonstration of the operation and testing of the draft hood or draft diverter.
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

Опубликовано:

7 окт 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 34

@deanmartin1966 12 лет назад

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.

@rickbraden4272 5 лет назад

This is the best explanation & demonstration of draft hood/draft diverter I have ever heard or seen. Great camera shots.

@grayfurnaceman 5 лет назад

Thanks for the support. GFM

@mugen-mundo 6 лет назад

Great vid. I would like to add that the vent also allows remaining gases to expel up chimney after the burners cut off.

@grayfurnaceman 11 лет назад

You got it. In the simplest terms. As is the best way. Thanks for thoughts. GFM

@geojor 9 лет назад

excellent explanation, thank you for your expertise...

@Machia80sbaby 4 месяца назад

Yes sir impeccable work

@leslieharlan1730 3 года назад

Thank you for all your videos

@grayfurnaceman 3 года назад

Welcome GFM

@leslieharlan1730 3 года назад

@@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.

@grayfurnaceman 11 лет назад

Welcome GFM

@DONALD1951 5 лет назад

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.

@ZteveW 11 лет назад

Mr. Gray, where were you when I needed you 26 years ago in shop class huh? lol. Thanks.

@RanjitMand-d9c 6 дней назад

Thanks

@nakiapringley5391 2 года назад

Great video 💯💯💯💯

@brentaudi9354 10 лет назад

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

@runsheeprun 7 лет назад

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.

@garysmith10449 11 лет назад

In simplest terms the draft hood disconnects the appliance from the chimney and the affects the chimney may have on the appliance

@shellyblanchard5788 Год назад

This is similar to mine.

@ThePaperKhan Год назад

Burner tubes? Could you mean the heat exchanger?

@grayfurnaceman Год назад

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

@mikerefrigeration5736 6 лет назад

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 6 лет назад

I think you have a restriction in the venting above the draft hood. GFM

@mikerefrigeration5736 6 лет назад

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.

@JustPlumDucky 8 лет назад

Another video mentioned a Spill Switch. Why doesn't this furnace have one? Something that came later?

@grayfurnaceman 8 лет назад

+JustPlumDucky Spill switches were added on many units in later years. A good idea. GFM

@geojor 9 лет назад

do all types of furnaces (forced air, boiler, etc) have draft hoods?...thanks...

@grayfurnaceman 9 лет назад

pei bossman Draft hoods were eliminated on most units with the advent of the inducer fan, around 1990. GFM

@geojor 9 лет назад

thank you...

@biblebloopers946 2 года назад

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

@grayfurnaceman 2 года назад

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 2 года назад

@@grayfurnaceman what safety shuts off the natural draft furnace in the event of backdraft?

@grayfurnaceman 2 года назад

@@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