Furnace Pressure Switch Testing and Replacement!
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- Опубликовано: 23 мар 2018
- In the HVAC Furnace Video, I go over The Testing and Replacement of a Bad Furnace Pressure Switch. I Explain Step by Step How to Troubleshoot the Heater. I Explain the Sequence of Operation for Heat, How to Measure Voltages, How to Read Tube Pressure, and How to Check the Pressure Switch Isolated from the Furnace. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
3/16" Brass Barbed Tee- amzn.to/3AmmBfo
1/8" NPTF x 3/16" barb fitting for reading WC pressure - amzn.to/2G563Bq
FieldpieceSDMN6 Dual Manometer Pump - amzn.to/2jyK5Ka
UEI DL489 Multimeter: amzn.to/47Fod5n
Alligator Jumpers- amzn.to/2PxqJXn
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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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#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #pressure #pressureswitch #furnace #gasfurnace #components #heater #components
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For those that are looking for the tools used in the videos: (Linked Below)
Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ
Here is the Link to the Supco Universal Adjustable Pressure Switch -.01wc -10.0wc amzn.to/2G1y0py
Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
Here is the link to the 3/16" x 3/16" x 3/16" brass barbed tee- amzn.to/2INSRhQ
Here is the link for the 1/8" NPTF x 3/16" barb fitting for reading wc pressure- amzn.to/2G563Bq
Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z
Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ
Here is the link to the 2 pairs of alligator clips- amzn.to/2CtIL5z
Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o
Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph
Here is the link for the Irwin Wire Stripper/Cutter/Crimper- amzn.to/2dGTj2V
Here is a link to the Stanley 6 in 1 screwdriver- amzn.to/2x7NuaZ
Other tool links can be found in the video description section.
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im new in the field
this manometer is nice & easy to use
Excellent video ACSERVICETECH!!!! I couldn't have done (nor many could) any better! Excellent!
Thanks Josh!
I am trying to remember how to troubleshoot vaccum switches and this video is good.
You mean learn , not remember. Once you know you know
Nice! Clearly shown and love the tool lists. One thing I aways do when troubleshooting something I’m not 100% sure of electrically is to put my meter on the source of the voltage and the other probe on my ground to ensure that the ground is indeed part of the circuit. Even if the schematic shows a grounded neutral or common doesn’t mean it was wired that way. Always prove your test equipment, too.
Yeah, you are right, thanks Jack!
Hi there just wanted to let you know I love your videos and the way you explain things iam not an hvac person iam a contractor but for the last few years I have been putting a lot of time into learning and I have learned a lot from you just want to thank you for the excellent work and your time i am front totonto Canada
Thank you again
Thanks for letting me know Ziyad d!
really like that magnet uses as the safety switch press down
All of your videos are awesome sir!!!
Thanks tootoocreative!
Great vid man keep up the great work
Thanks Kenneth!
Great video as always
Thanks Channel Cat Chaser!
Thank you for the video. Very helpful!!!💪🏻 Tell please in one of future videos about zoning systems. How it works, troubleshooting. Thank you so much.
Hey Tapch MC, thanks for letting me know what you would like to see. Sometimes it depends on what systems I have in front of me. I will keep it in mind, thanks
Nice video, thanks for posting. I myself carry the universal switches for replacement, setting them up with the Fieldpiece pump you have in the video. And I don’t use them as temporary, due to the fact I’ve never seen documentation that says they can’t be permanent or are only for temporary use, and they’ve lasted in Lochinvar boilers I have at the school district I work for. I like the fact I have a switch that’ll cover a myriad of switches, kind of like the universal igniters.
You absolutely can leave them in place. I just usually go and switch them out for the exact one. In this case, it was because I wanted to replace two in case the other would go in the future and they come as a set, thanks tcpHVAC/R!
Great video thank you
Thanks Ron!
Great video
Thanks Tank!
Wow! I have that Fieldpiece manometer but now I know what some of the buttons are for!
Glad to help Rinebo0011!
👍🏼👍🏼great video!
Thanks Darwin!
Shop through Amazon!- www.amazon.com/shop/acservicetech -Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.
If you want to support the ACSERVICETECH Channel and receive more HVACR content, check out www.Patreon.com/acservicetech
All of the ACSERVICETECH Playlists- ruclips.net/channel/UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public
Hey brother!! Love you videos.
I have a head scratcher.
What if you text the vacuum that the inducer is creating and its strong enough that it should open the valve.
Then you test the valve and it opens at about 1.6"wc
But not when its connected to the inducer housing.
I'm getting the inducer to pull about 4" wc
Awesome video...I was able to repair my WM Cgs-5 boiler today. Are you going to printing a service procedures book for heating like you did for AC?
Seems like I keep making the same comment on all of you videos, but great video.
I appreciate it Kenny!
On most furnaces does low voltage 24v typicall start with pressure switch form the transformer?
Great video @acservicetechllc !!!
I also recommend double check hose(s), port(s) for any obstruction(spider web, calcification, etc )
Question: What is that on the top of that 2" gas black nipple before the gas valve??? Is it a kind of flow switch ?
I never seen something like that before!!
That is a low pressure gas switch for units that run on propane instead of nat gas. These typically come in the conversion kits depending on the manufacturer but should really have one installed regardless if it is for lp. Look up "acservicetech low pressure gas switch" for a video on that, thanks!
thanks
what's your name ?
Craig Migliaccio from Southern NJ
AC Service Tech LLC thanks Craig
glad to help!
How would I know if the high stage pressure switch is good or bad?
Very good video as always.
Where can I get the “T” assembly you used to put the manometer in series with the inducer to make sure it was pulling the correct draft?
Hey Abner, I pinned the link for that tool at the top of this comment section with the other tools, thanks! I just got off a 16.5 hour day getting a furnace running, oh man!
acservicetech wow! I can’t imagine what you’ve been through trying to get that furnace going.
Thank you! I just purchased it through the link.
How do u determine the difference between low fire or high fire pressure switch? Is the high fire ps always in close to furnace or the one more out?
They are not always in the same position. Sometimes the low fire and high fire both need to be closed but on low stage only the low fire is closed, thanks
How do I know which pressure switch is right for my furnace? Considering the make/model and altitude?
A pressure switch can only be replaced with one the exact same wc size. When I order them with the supply houses, sometimes I just give them the model and serial and wait for them to tell me the size and that confirms it for me that they have the correct on, thanks.
Hi, I have a digital manometer. Where can I buy the Tee and extra tubing, so I can make the connections to the pressure switch like you did? Do the supply houses carry them or amazon? THANKS FRIEND
Hey Ronald, I pinned the amazon link for that tool at the top of this comment section with the other tools, thanks! I just got off a 16.5 hour day getting a furnace running, oh man!
Better get some sleep, THANKS you helping
Thanks Ronald!
Do they make universal hot surface ignitor to get ppl heat for the night?
Yes glowfly but sometimes you need one bigger and should go with an oem silicon carbide. These will work in many cases though- amzn.to/2r8gOJ6
I had a service guy come out yesterday and wanted to charge me 400.00 for replacing my switch....seemed a little high for just removing a couple of screws.
What kind of schooling did you attend to get to where you’re at in this trade?
Just field experience followed by teaching experience. No school other than manufacturers trainings here and there. In order to teach, I dug deep into testing and practices on equipment as well as how to communicate all of this proficiently, thanks
can i check voltage on pressure switch 2 terminal? not with ground with 1 terminal on pressure switch. like if there is 24volt on pressure switch, its open. if 0v, its closed. can i diagnose like that?
You could check it that way but I prefer checking it by using ground or common along with the hot. It is also easier for teaching someone when they are learning I believe, thanks
thank you for answering my question. i am really enjoying watching your video and learning a lot more than learning school. appreciate all your work.
ive had people replace the gas valve, thinking it was the gas valve, later to find it's the pressure switch. Most gas valves can't operate until pressure switch closes
Oh wow, that is even forgetting about ignition too, nice!
if you are getting 24 volts at gas valve most likely is the gas valve malfunctioning
Do you have a video about testing a zoning board?
Hey Anthony, if you are looking for boiler zoning then type "acservicetech boiler zone" thanks
Thank you that video was very helpful. You really are a genius and i definitely learn alot from these. Although i was leaning more towards a zone system for dampers in the duct system. I had a call and could not reach the damper without taking out drywall. I am not so keen on zone board troubleshooting, so my problem was trying to diagnose if the damper motor itself was bad. Or the zone board. One of the two would not allow any airflow and was stuck in the closed position.
if they're like most folks, it's just the propane tank empty :))
Yeah unfortunately that happens. That is one of the questions I ask them on the phone before coming. This way, if it is the propane empty or power off then they understand why I have to charge them for coming still, thanks
At 5:19 it gets confusing, you say the pressure is going up but don't you really mean the vacuum is increasing? Therefore , don't you mean the pressure is actually going down?
Good shit....... I’ve never touched a gas furnace since I’ve been in the trade. I live in Miami.... barely get any cold days....... nothing but heating strips and some heat pumps.
Thanks Oscar!
Oscarbm1234 wow! Never?
never...... I've been in the trade for 3 years and never met anybody that has serviced one either... just heat pumps
Everything out of focus, your hand in the way most of video coverage
Great video
Thanks Deanmartin!