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harvey_mason

05:37AM | 01/26/04
Member Since: 03/04/03
44 lifetime posts
Bvhvac
I have a 3/4 inch gas main coming into my basement, from there it splits off to feed my furance which looks like it is reduced to half inch and also feeds a gas heater out in the garage w/ half inch, as well as my 50 gal. water heater.

The rest of the gas lines I believe are 3/4 inch which feeds my dryer, and 2 gas stoves, I live in a mother daughter so I have a 2nd range on the 2nd floor.

When I had my new Bryant furance installed last year I had a couple of bids and one contractor said the 3/4 inch main coming into the house may need to be upped to 1 inch. The company who ended up doing the job said it was ok.

I find it funny that the furance is only fed w/ 1/2 inch?? isn't that the biggest gas appliance in the house consuming the most BTUs?? How can I tell if that my furance is being starved or any of my appliances are being starved by having a 3/4 main and not 1 inch?? Is there any kind of calculation I can do to determine this?? OR is there a max for 3/4 inch??

Maybe the old rule applies here "if it's not broke don't fix it" but I was just wondering esp. since the furance is only fed w/ half inch and not 3/4?? Could I be losing any effiency? or worse damage it?

Lastly, I was also toldl that if a gas appliance is being starved you will hear a high pitched squeal coming from that appliance? Is this true??

Your help is greatly appreciated,

TIA,
Harvey

[This message has been edited by harvey_mason (edited January 26, 2004).]

harvey_mason

08:28AM | 01/26/04
Member Since: 03/04/03
44 lifetime posts

Thanks for the reply,

I will post the btu specs on the appliances as you suggest tomorrow, I am at work right now....

But am I still wrong to assume that my furnace isn't the largesst consuming btu gas appliance and should be on 3/4 inch?(I will post the btu info tomorrow) I do not have a gas fireplace as you suggest, all of my gas appliances were posted in my previous post.
2 stoves,1 hot water heater,1 furance, 1 dryer and 1 gas space heater heating room in garage, this line is run underground out to my garage and approx 100 ft away)

My furnace water heater and dryer are all close to one another and about 15-20 foot from the 3/4 main coming into my basement

thanks in advance,
Harvey

plumber Tom

09:57AM | 01/26/04
Member Since: 05/10/03
810 lifetime posts
You would also need to know the gas pressure coming into the house. A rough btu guestimate I came up with was 271,00 with the appliances you mentioned. That's with both oven burners and 2 burners on each stove being used. That 3/4" main doesn't sound big enough, however you may have a higher service in your area. And yes the appliance that is starving you will notice a whistling.



harvey_mason

10:40AM | 01/26/04
Member Since: 03/04/03
44 lifetime posts
Thanks Tom for your response.

I have not noticed any whistling from any appliances, although it is very rare that all appliances are used at once.......

I am curious to check the btu rating of my new bryant furance, I will post it when I get home tonight as well as the btu ratings for the other appliances.

Thanks again,
Harvey

[This message has been edited by harvey_mason (edited January 26, 2004).]

harvey_mason

02:21AM | 01/27/04
Member Since: 03/04/03
44 lifetime posts

Ok guys....

my bryant furnace is 80,000 btu input 75,000 output on high.... on low it is input 52,000 output 49,000

water heater is 40,000 btu
dryer is 22,000 btu
garage space heater is 600 btu


the only appliance I couldn't find a plate for was stove but the stove is your run of the mill 4 burner stove w/ oven.

so with all that said do you gusy think 3/4 main coming in is big enough??

thanks in advance,
Harvey

plumber Tom

02:56AM | 01/27/04
Member Since: 05/10/03
810 lifetime posts
Yes your fine Harvey. I was estimating your furnace at 125,000 water heater at 50,000 space heater at 30,000 dryer at 22,000 and both oven burners and 2 stove burners on at 64,000. The stamped plate on the range is visible once you open the broiler, or maybe underneath the cooktop. So my estimate was way over and your original statement holds true. "If it Aint Broke, then don't fix it."

harvey_mason

09:16AM | 01/27/04
Member Since: 03/04/03
44 lifetime posts

Thanks Tom.

I will check the oven when I get home. IS there two ratings on each oven, one for oven adn one for 4 burners? Or is it cumulative to the whole stove??

Thanks agin Tom,

Harvey

plumber Tom

11:41AM | 01/27/04
Member Since: 05/10/03
810 lifetime posts
Two ratings . 1 for the oven burner and can be more then 1 for the burners depending on their size. Example: My Kenmore oven burner is 18,000. The large burner on the top is 14,000. The smaller burners are 8,000. medium burners have another rating so again check the nameplate.
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