Furnace Pressure Switch Troubleshooting- Definite Testing Procedure!
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- Опубліковано 8 вер 2024
- In this HVAC Furnace Troubleshooting Video, I go over how to definitely tell if your Pressure Switch is good or bad. The pressure switch is one of the most misdiagnosed components in furnaces. I use a modulating gas furnace with several pressure switches as an example. I use an SDMN6 with an internal pump in order to diagnose the pressure switch while comparing the pump pressure to the rated pressure on the pressure switch. Supervision is needed by a licensed HVAC Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
SDMN6 Dual Digital Water Column Manometer with Pump: amzn.to/2UGclNv
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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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For those that are looking for the tools used in the videos: (Linked Below)
Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2av8s3q
Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z
Here is the link for the Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V
Other tool links can be found in the video description section.
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out of all those tools you list no multimeter?
I would like to add a priceless tip that I learned from experience. Sometimes there will be calcium buildup or corrosion that will block the nipple at the inducer motor housing where the pressure switch tube connects. I've pulled my hair out before on units where the pressure switch tested perfect and there were no blockages in the vent only to later discover a blockage in that location. Now I always pull the tube from the inducer housing to check for a blockage prior to bothering with pressure switch testing
I am absolutely with you on that. The aluminum inducer motor housings will create a blockage at that port and you have to pierce through the blockage. The issue is that when checking with the manometer, It will give you pressure and other times not because the hole just started closing off completely. Thanks for the insight!
acservicetech hey man you are a good teacher but an excellent person!!! Sharing your knowledge with us it is priceless!!
Frontiermarvin71, I appreciate your comment and I always appreciate LiberalTears aredrowning me's posts! Thanks!
Frontiermarvin71, I appreciate your comment and I always appreciate LiberalTears aredrowning me's posts! Thanks!
Frontiermarvin71, I appreciate your comment and I always appreciate LiberalTears aredrowning me's posts! Thanks!
This is a great tool to check pressure switches. I see a lot of techs blowing into the tubes of pressure switches which ruins them because they cant take high pressure. Also i always check the bleed port on the pressure switch,if plugged it wont work properly. Thanks for posting this.
Yes bleed ports are very important, thanks for adding that!
Thank you for posting such a great video. This tip can help you out. When testing pressure switches press the HOLD button, and the pressure value indicated on the display when the red light comes on (closing) or goes out (opening) will be frozen giving the exact value.
Thank you again.
Great Tip Angel, Thanks
Love your vids man, you're articulate and thorough without rambling on about unimportant stuff like some others
Thanks a lot arkanoiddude!
This is a really cool video acservicetech now I know how this tool works and how to test the pressure switch better...Thank you.
Thanks Pedro Rodriguez!
Very useful. I just got this manometer. Just been using it to set gas pressures. Not anymore, thanks. I'll start using this feature.
I love that manometer. That tool really gave me the confidence to know that I will be able to figure the problem out for sure, thanks Daniel!
You could use it to check Static Pressure as well. It tells you very quick if a duct system was built properly. or if a zone is shoot close!....
I have learned so much from your videos. Thank you for posting them. May God bless you.
May God Bless you too gilberto patino, Thanks!
Just one addition to this video. Pressing the hold button while increasing/decreasing the pressure it will show you at what point the pressure switch makes or brakes. It also tell you if the diaphragm is rupture.
Yes Absolutely, thanks R R!
Thanks for the video & great explanation. I now understand how this tool works & will probably be my next purchase
Thanks Dl7279!
very cool, I didn't know there was a monometer that could also troubleshoot pressure switches.
thank u so much i needed that!! one last thing can u make a video using the manometer on that same meter?? thanks u are the best teacher!!
I am sure I will be doing that on a video coming up. Thanks Fred
Your videos are very informative.....thanks for taking the time to do them.
Thanks Adam!
This is a great video, thank you!
Thank you, great knowledge at end it is Very useful information to know.
Another terrific instructional video
Thank you Very Much!
Well done
Thanks a lot Gnanesh!
I would like to suggest, a video on replacing the heat exchanger. Thank you.
Ron I would have to wait until I got a warranty heat exchanger in order to do one. Thank you for letting me know what you would like to see!
Very nice tool. Very helpful
@acservicetech...Excellent instructional video...really enjoyed it !!
Thanks Paul HVAC!
do you truck stock universal pressure switches and set them in the field with the SDMN6?
very good video thank you for sharing!!!!
Thanks Jimbola77!
I would like to see a video like this using an adjustable pressure switch using a spring an adjusting it to a 0.74
I would like to do a video on replacing the pressure switch with an adjustable soon, thanks!
@@acservicetechchannel cool yeah when I do servicing I can't carry all different pressure switches to get ppl heat working in the middle of the night especially when supply houses are closed
Yeah I just replaced a switch with an adjustable one friday morning but was in a rush and didn't make a video. i would like to do one soon, thanks. Do you have the Fieldpiece SDMN6 to set them? Thats what I use. Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump- amzn.to/2jyK5Ka
@@acservicetechchannel no not yet I currently have Fieldpiece SDMN5 but not the 6 yet but will get it real soon.
It is very easy, just press the hold button and it will show you at what point the PS makes. Then, you will either add tension or loosen the spring.@@acservicetechchannel
I did some research since tech support told me pressure switches open according to the rating on the tag... not close.
I am currently dealing with a furnace issue. The inducer pulls 1.7" WC, but has a rating of 1.4"WC. It doesnt get continuity across the switch. Tech Support mentioned "the 1.4 inches WC rating is when the pressure switch opens. It takes about 1.75 inches WC to close". I always thought they close according to the tag rating. You mentioned the same thing in your video that they should close once they reach that pressure. Which one is right?
Awesome video!
Thank you for the videos.
Thanks Ron!
Great video again
Thanks Ronald Cach!
Very informative
Thanks Saeed!
GREAT video as usual. Please add the tool name to the title.
Hey Ivan Hall, Jesus is King, nice pic! I have the SDMN6 model number in the tags, description, and comment section so it should come up in the general search. Thanks
acservicetech thanks for the reply! Thanks for the complement as well! CHRIST IS KING! Be blessed and encouraged Bro!
what the bleed port is used for. Do I need to connect it every time or only if the switches don't have it
Why yours starts below 0.20 wc and mine starts increasing all the way up to 4.00 inwc by itself ?
Please help!!
Good video, great tool, but dont really need the tool. Would be nice to own one.
Hey Mark, have you seen this video yet? Thanks- ua-cam.com/video/v9QWIr9TIVU/v-deo.html
The SDMN6 has an accuracy of +/- of 0.02inWC in 0.00-2.00inWC range. Can't this make things very inaccurate when testing low static pressure?
If you're trying to measure butterfly farts then you will need to spend more than $300.
any idea where you can purchase those black leads for the pump aspect of the meter?
This tool is from fieldpiece and you could get replacement leads from them for this tool, thanks!
Just curios what brand furnace that is? Its not everyday I come across a variable inducer motor
Well I figured to show you the tool and process that I would use a harder furnace for intermittent problems in order to take one type of component out of play for the diagnosis of a problem. I believe this was a Bryant model 987MA042060V17 off the top of my head. Thanks
hey . can u do the video for the gas furnace with the sdmn6. thanks!
I think you are talking about teching out the pressure switches while that furnace is running, correct?
acservicetech. yes
that meter is also a manometer to check inlet and outlet gas pressure. i needed to see how to do that with that meter. thanks! Ac service tech!!
Do you recommend fieldpiece or UEI instruments?
Uei for multimeter, and this fieldpiece manometer and pressure switch tester. I have used uei for gauge and digital manometers too so I have great faith in them. This fieldpiece manometer however really fits the need with it's internal pump and works well. The links for these tools are in the descriptions. This manometer link is in the description of this video and the uei multimeter is in the description of every video.
Why do you keep tapping the switch?
I believe I was lowering and raising the pump pressure. I don't think I was using the hold in this video while doing it so I was going slower. Did you check this one out- ua-cam.com/video/QAEBLigVD5g/v-deo.html