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Quick help with Onan 12.5


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  #101  
Old 04-15-2017, 11:03:11 AM
Ray Lynch Ray Lynch is offline
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Default Re: Quick help with Onan 12.5

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Originally Posted by Max Thompson View Post
That info is in #T-015 gaseous fuels manual. I think it is on the twainslan site.
It's there.
Ray

http://www.twinslan.net/~n0nas/manuals/onan/
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  #102  
Old 04-15-2017, 11:47:47 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Quick help with Onan 12.5

Being I just had the T-015 manual out yesterday giving the propane company the consumption for a SK, I will post full load consumption for your 12.5 JC: 92 Cubic feet per hour propane and 228 cubic feet for natural gas.

Last edited by nothingbutdarts; 04-15-2017 at 01:18:53 PM. Reason: spelling
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  #103  
Old 04-15-2017, 12:00:14 PM
len k len k is offline
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Default Re: Quick help with Onan 12.5

That's ~ 230k Btu/hr , which is about 2x as much as your house furnace uses.
Look at the gaseous fuel manual, you may have to increase your gas pipe diameter to fuel the gen , and have gas co change the flow restrictor in the meter outlet.

Or have gas co up it's pressure to 2 psi.

Last edited by len k; 04-15-2017 at 12:54:49 PM.
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  #104  
Old 04-15-2017, 02:40:30 PM
Handyhiker1 Handyhiker1 is offline
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Default Re: Quick help with Onan 12.5

I have a 1.5" main line with the boiler and hot water tank sharing a 1/2" line. The only other gas I use is for the burners on the stove, the oven is electric. I only need to run about 25' to the outside wall where the generator hook up will be. From the chart that I looked at in the T-015 manual (thanks for the info), it looks like 1" pipe will work in the house.
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  #105  
Old 04-15-2017, 03:59:12 PM
len k len k is offline
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Default Re: Quick help with Onan 12.5

1" pipe sounds small, but I haven't looked at manual.
Others know this stuff off the top of their head without looking in manual.
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  #106  
Old 04-15-2017, 04:05:24 PM
Handyhiker1 Handyhiker1 is offline
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Default Re: Quick help with Onan 12.5

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Originally Posted by len k View Post
1" pipe sounds small, but I haven't looked at manual.
Others know this stuff off the top of their head without looking in manual.
I will recheck when I have a little more time to actually sit down and read it. Just took a quick glance today.
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  #107  
Old 04-15-2017, 08:16:15 PM
Max Thompson Max Thompson is offline
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Default Re: Quick help with Onan 12.5

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Originally Posted by len k View Post
1" pipe sounds small, but I haven't looked at manual.
30' of 1" BLK iron will deliver 377 CFH (377,000 BTU). Add 10' for each 90 degree turn, (going around a tee = a 90). Not knowing how long your run of 1 1/2" is, but "assuming 140 CFH for the boiler and 40 CFH for the water heater, I will bet you will be in good shape.

Double check the size of your existing trunk line. In my area, 1 1/2" (ID) is uncommon in a residential system, 1 1/4" was "standard" back in the old days and now we rarely run anything larger than 1". Commercial is a whole different game.
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  #108  
Old 04-16-2017, 08:24:50 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Quick help with Onan 12.5

My meter is right outside the front wall of the house and comes in the basement. It goes through 2 elbows to my main trunk line. it is all the same size at 1-1/2" pipe. The guy that built this house, we are the third owner, built it to commercial specs. I know that sounds weird but all of our 1st story floors are poured concrete with steel girders in the basement ceiling for support. I have no support posts in the basement. The basement walls are 18" thick and fire rated block, the upstairs walls are 2x6 stud plus brick and insulation board.
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  #109  
Old 04-16-2017, 10:25:14 AM
Max Thompson Max Thompson is offline
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Default Re: Quick help with Onan 12.5

Sounds like a "preppers" dream home.
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  #110  
Old 04-16-2017, 11:44:22 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Quick help with Onan 12.5

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Sounds like a "preppers" dream home.
When we bought it, the neighbors called it the "bomb shelter house". Everything is poured concrete.
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  #111  
Old 04-16-2017, 12:14:27 PM
len k len k is offline
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Default Re: Quick help with Onan 12.5

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Everything is poured concrete.
No termites.
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