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HVAC help #4552234
10/23/17 05:42 PM
10/23/17 05:42 PM
Joined: Oct 2011
Posts: 3,031
Chicago, IL
Brybo86 Offline OP
Brybo86  Offline OP

Joined: Oct 2011
Posts: 3,031
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


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
Re: HVAC help [Re: Brybo86] #4552261
10/23/17 06:08 PM
10/23/17 06:08 PM
Joined: Dec 2014
Posts: 375
Huntington WV
dbias Offline
dbias  Offline

Joined: Dec 2014
Posts: 375
Huntington WV
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


2011 VW JETTA Castrol Edge 0W-40
2012 FORD TRANSIT CONNECT Castrol Edge 5W-20
2016 HONDA CIVIC COUPE Frankenbrew 0W-20 to 5w-40
2017 AUDI A4 Mobil1 0W-40
Re: HVAC help [Re: Brybo86] #4552269
10/23/17 06:11 PM
10/23/17 06:11 PM
Joined: Aug 2008
Posts: 24,184
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 24,184
ON, Canada eh?
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


'18 Dodge Grand Caravan GT - 26k KM - AMSOIL SS 0w20
'06 Hyundai Santa Fe - 535k KM AMSOIL SS 0w30
Re: HVAC help [Re: Brybo86] #4552291
10/23/17 06:25 PM
10/23/17 06:25 PM
Joined: Oct 2011
Posts: 3,031
Chicago, IL
Brybo86 Offline OP
Brybo86  Offline OP

Joined: Oct 2011
Posts: 3,031
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


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
Re: HVAC help [Re: Brybo86] #4552352
10/23/17 07:13 PM
10/23/17 07:13 PM
Joined: Mar 2004
Posts: 21,877
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,877
Upstate NY
Time for new furnace. 1971 is OLD


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: HVAC help [Re: Brybo86] #4552356
10/23/17 07:17 PM
10/23/17 07:17 PM
Joined: Nov 2014
Posts: 62
Florida
FSully1 Offline
FSully1  Offline

Joined: Nov 2014
Posts: 62
Florida
Old but........build date was 36th week of 1974 in Fort Smith, Arkansas

Re: HVAC help [Re: Brybo86] #4552396
10/23/17 08:16 PM
10/23/17 08:16 PM
Joined: Mar 2004
Posts: 21,877
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,877
Upstate NY
The condensing and modulating gas furnaces will be significantly more efficient.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: HVAC help [Re: Brybo86] #4552502
10/23/17 10:46 PM
10/23/17 10:46 PM
Joined: Oct 2011
Posts: 3,031
Chicago, IL
Brybo86 Offline OP
Brybo86  Offline OP

Joined: Oct 2011
Posts: 3,031
Chicago, IL


Hey we are at 3.5"WC


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
Re: HVAC help [Re: Brybo86] #4552616
10/24/17 06:40 AM
10/24/17 06:40 AM
Joined: May 2007
Posts: 7,811
Indianapolis, IN
dnewton3 Offline
Global Moderator
dnewton3  Offline
Global Moderator

Joined: May 2007
Posts: 7,811
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!


Last edited by dnewton3; 10/24/17 06:43 AM.

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
Re: HVAC help [Re: Brybo86] #4552931
10/24/17 11:24 AM
10/24/17 11:24 AM
Joined: Oct 2011
Posts: 3,031
Chicago, IL
Brybo86 Offline OP
Brybo86  Offline OP

Joined: Oct 2011
Posts: 3,031
Chicago, IL



Thanks for your reply dnewton!


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
Re: HVAC help [Re: Brybo86] #4552937
10/24/17 11:30 AM
10/24/17 11:30 AM
Joined: Aug 2008
Posts: 24,184
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 24,184
ON, Canada eh?
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

Last edited by StevieC; 10/24/17 11:31 AM.

'18 Dodge Grand Caravan GT - 26k KM - AMSOIL SS 0w20
'06 Hyundai Santa Fe - 535k KM AMSOIL SS 0w30
Re: HVAC help [Re: Brybo86] #4552989
10/24/17 12:04 PM
10/24/17 12:04 PM
Joined: May 2014
Posts: 3,948
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline

Joined: May 2014
Posts: 3,948
Columbus,Nebraska
Isn't gas pressure to homes regulated at about 1 psig or less?

Last edited by HosteenJorje; 10/24/17 12:08 PM. Reason: wrong data
Re: HVAC help [Re: Brybo86] #4553146
10/24/17 02:28 PM
10/24/17 02:28 PM
Joined: Jul 2014
Posts: 141
North TEXAS
oldoak2000 Offline
oldoak2000  Offline

Joined: Jul 2014
Posts: 141
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 . . .)

Re: HVAC help [Re: Brybo86] #4553344
10/24/17 05:29 PM
10/24/17 05:29 PM
Joined: Oct 2011
Posts: 3,031
Chicago, IL
Brybo86 Offline OP
Brybo86  Offline OP

Joined: Oct 2011
Posts: 3,031
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 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
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