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#4552234 - 10/23/17 05:42 PM HVAC help
Brybo86 Offline


Registered: 10/08/11
Posts: 2956
Loc: Chicago, IL
I have an old Rheem furnace that I need to know the amount of gas pressure it needs to read at the pressure tap

"Rheem Imperial Glass Lined" circa 1971
the Model number is 3404-125JD
Serial number CN3D2B3 F3674 1632
125,000 BTU input
100,000 BUT output




thanks
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#4552261 - 10/23/17 06:08 PM Re: HVAC help [Re: Brybo86]
dbias Offline


Registered: 12/24/14
Posts: 147
Loc: USA
its blurred in your picture but its in the lower left hand corner of the plate...... "WC that is inches of Water Column. there are conversion tables to turn that into psi
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#4552269 - 10/23/17 06:11 PM Re: HVAC help [Re: Brybo86]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
You can punch in your Water Column here and it will convert it to PSI for you.

https://www.google.com/search?client=ope...-8&oe=UTF-8
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#4552291 - 10/23/17 06:25 PM Re: HVAC help [Re: Brybo86]
Brybo86 Offline


Registered: 10/08/11
Posts: 2956
Loc: Chicago, IL
the EXT static pressure is just the air pressure created inside by the blower running

I need to know the manifold gas pressure im thinking it should be about 3.5" WC pressure

but i cannot find it listed anywhere on the unit
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08 Honda Accord EX-L 2.4L M1 EP 0w20 145k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 193k
95 Yamaha Jog

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#4552352 - 10/23/17 07:13 PM Re: HVAC help [Re: Brybo86]
Donald Offline


Registered: 03/21/04
Posts: 20548
Loc: Upstate NY
Time for new furnace. 1971 is OLD
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#4552356 - 10/23/17 07:17 PM Re: HVAC help [Re: Brybo86]
FSully1 Offline


Registered: 11/22/14
Posts: 46
Loc: Florida
Old but........build date was 36th week of 1974 in Fort Smith, Arkansas

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#4552396 - 10/23/17 08:16 PM Re: HVAC help [Re: Brybo86]
Donald Offline


Registered: 03/21/04
Posts: 20548
Loc: Upstate NY
The condensing and modulating gas furnaces will be significantly more efficient.
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#4552502 - 10/23/17 10:46 PM Re: HVAC help [Re: Brybo86]
Brybo86 Offline


Registered: 10/08/11
Posts: 2956
Loc: Chicago, IL


Hey we are at 3.5"WC
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08 Honda Accord EX-L 2.4L M1 EP 0w20 145k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 193k
95 Yamaha Jog

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#4552616 - 10/24/17 06:40 AM Re: HVAC help [Re: Brybo86]
dnewton3 Online   content



Registered: 05/14/07
Posts: 7403
Loc: Indianapolis, IN
3.5" wc is about right if you're on NG. (Propane would be around 11.5" wc or so).

Make sure you're measuring that wc when ALL devices are in operation. Your gas system needs to be sized and regulator set such that is can supply the pressure (3.5" wc) when not only it is running, but also all other gas appliances simultaneously. You may need to make altitude corrections if above 3000 feet (that's a generic answer for all; it won't be an issue in the Windy City).


BTW - your homemade manometer is nice. That's exactly how I did it when setting my propane regulator. No one needs an expensive tool when homemade gives you the correct answer!



Edited by dnewton3 (10/24/17 06:43 AM)
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The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money

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#4552931 - 10/24/17 11:24 AM Re: HVAC help [Re: Brybo86]
Brybo86 Offline


Registered: 10/08/11
Posts: 2956
Loc: Chicago, IL



Thanks for your reply dnewton!
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08 Honda Accord EX-L 2.4L M1 EP 0w20 145k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 193k
95 Yamaha Jog

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#4552937 - 10/24/17 11:30 AM Re: HVAC help [Re: Brybo86]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
A a child of the 1980's (just barely though), they must has had a sale on green/yellow pigments in the 1970's because everything was this colour it seems. LOL


Edited by StevieC (10/24/17 11:31 AM)
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#4552989 - 10/24/17 12:04 PM Re: HVAC help [Re: Brybo86]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3475
Loc: Columbus,Nebraska
Isn't gas pressure to homes regulated at about 1 psig or less?


Edited by HosteenJorje (10/24/17 12:08 PM)
Edit Reason: wrong data

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#4553146 - 10/24/17 02:28 PM Re: HVAC help [Re: Brybo86]
oldoak2000 Offline


Registered: 07/23/14
Posts: 119
Loc: North TEXAS
1971 ?!?!?!
I sure hope you have MULTIPLE working CO detectors in this dwelling

(and that they're not older than a few years old; they do 'wear out' and old ones (pre 2009) give NO WARNING at all . . .)

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#4553344 - 10/24/17 05:29 PM Re: HVAC help [Re: Brybo86]
Brybo86 Offline


Registered: 10/08/11
Posts: 2956
Loc: Chicago, IL
I have a couple brand new carbon monoxide detectors all testing well.
Where would this supposed Carbon monoxide come from?
I have inspected heat exchanger already, no cracks.

Also think about this,
the air in the actual heat exchanger is under much lower pressure than the air outside the heat exchanger that is being compressed by the blower.

With a crack or even a hole, the air is going to be pushed INT0 the heat exchanger which would cause the flame to look different or wavy. If really bad the flame would be pushed out of the front of the furnace where the gas and air enter.
_________________________
08 Honda Accord EX-L 2.4L M1 EP 0w20 145k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 193k
95 Yamaha Jog

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