Checking and Adjusting the Outlet Gas Pressure going to the Burner Tubes on a Gas Furnace!

This HVAC Video is about how to check and adjust the outlet gas pressure in the water column for a natural gas furnace. I show you where you can find the target pressure on the rating plate, where the service port can be located, what tool to use to open the port with the gas off, and the connection to the digital water column manometer. I show how to increase or decrease the pressure to get it close to what the rating plate is calling for. as well as other tips! Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.

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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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[hozerhvac]

AC service tech is always on point with his videos. Probably the best out there. I didn't think you were going to do furnace videos. I was hoping you would. Thank you so much for these videos. A couple videos I think new guys would like to see would be: Static pressure test, heat exchanger examination, removing gas valve and installing. If you have a way for us to donate I would like to. You helped me this first summer of my refergeration apprenticeship. thank you so much.

[alwayslearning]

I attended a two year HVAC program years ago before computers. This guy is a great instructor. Thanks for the info.

[vernroach]

Excellent instruction...I have watched this more than once, compared to others, and this by far is the best.

[adamrenfrow]

Aka, Single “stage” gas valve. (For homeowners)
Love your videos man. Always reference them for AC

[alimahdavi]

Thanks, now it's clear for me how to adjust the manifold pressure with my manometer

[OneLeggedTarantula]

Best video I've seen on this, clearly explained. Thanks

[fonzario]

I ordered a replacement 74W26 gas valve for my Lennox furnace and there is no adjustment screw. It does indicate that it is factory set to 3.5 WC. I installed it and it ran like a charm.

[acuraintegrar]

Thank you for a clear and easy
Video to follow while learning!

[air]

Very cool and informative video, thanks . No matter how good you are at fixing broken stuff and fault finding, sometimes you just have to ask 👍 And extra credits for the link and tools list !!

[fredd]

your videos are quickly becoming my favorite.

[elguapo]

Excellent example of how to confirm and adjust Manifold Pressure.  A word of caution for Service Techs. If using any electronic meter to do so, you must have it's calibration certified yearly and put that certification certificate in a safe.  Should an incident occur, you have done your due diligence to ensure you are using a tested and accurate instrument.If you don't want to go through all that hassle, use an actual water manometer from Yellow Jacket.  You calibrate it every time by filling the water up to the Zero mark.Stay safe,

[meerscan]

very good video, quality and straight to the point

[wkobayashim]

2:14 my brass cover isn't coming off. Any tips to get it off without damaging the cover?

[yepper]

At 5:33 you say " you gotta make sure you're zeroed out with the inducer motor running". Is that right? Don't you mean without the inducer motor running? I'm just wanting to make sure I'm not missing something here. I appreciate your videos a lot, by the way! You speak clearly and not to slowly. And you get to the point without added peripheral stuff just to drag out to 10 minutes. Thank you!

[treyblaineOU]

Great info. I am new and almost done with my technical cert. program at Ivytech. Nice to have detailed videos to help.

[l.a.m]

What size Allen key to take off port to hook up my barb fitting?

[mark.r]

Hi, i am replacing a gas valve for a furnace. The old valve doesn't use this (vent port) as it's not a seal combustion burner. However, the new valve also has a vent port with a small 90 degree fitting on it.
Can i just remove this fitting and plug it up? And set manifold pressure to 3.5"wc? Thank you for all your helpful tutorials.

[subaru]

Loved the video.. Very informative, straight forward and direct, excellent and thoroughly explained. I endorsed this video..

[noelbijerez]

Excellent I like this video. It show everything on how to use a manometer. Clearly