Gas Appliances - Preparing for Heating Season Part 1
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- čas přidán 29. 08. 2024
- In this HVAC training video, Bryan Orr teaches a class to Kalos staff on preparing for heating season, focusing on gas appliances. This is part 1 of a video series preparing HVAC technicians for heating season service calls and maintenance.
Most systems in Florida use 80% open combustion furnaces, which is different than other parts of the country that use 90%+ high-efficiency or condensing gas furnaces.
The main tools we use with gas appliances include a combustible gas leak detector (to find leaks), combustion analyzer (to test the flue gases for commissioning), manometer (to adjust gas pressure at the gas valve, also used to measure static pressure), and low-level CO monitor (for personal safety). Since we typically have metal flues in our market, drilling a hole into the flue for combustion analysis is difficult; we may alternatively stick the probe into the outlet of the flue. Low-level CO monitors measure ambient carbon monoxide levels (NOT carbon dioxide / CO2) to protect HVAC professionals when they work.
The top skills you will need to work on gas appliances are carrying out a thorough visual inspection, examining the surrounding areas (not just a furnace), using a manometer to measure gas pressure (on either a standard or Gemini gas valve), using and selling low-level CO monitors, and using a combustible gas leak detector to find gas leaks.
The gas furnace sequence of operation begins with a W call from the thermostat, which prompts the board to confirm that the pressure switch is open. If the pressure switch is closed, the inducer fan will start, which leads to the pressure switch closing. The board will confirm that the safety circuit is closed, which is an ongoing process, before the ignition sequence begins. The gas valve then opens to allow natural gas to come through, and then a flame should propagate. From there, the flame rod (or flame rectifier) will prove the flame. (The furnace must be well grounded, and the rod must be clean and immersed in flame.) The blower turns on as the final step in the sequence of operation.
Topics covered in this video include:
Uses of tools like combustion analyzers, personal CO monitors, and gas leak detectors
Caps and leaking gas lines
Common issues to look out for, including gas line leaks, corrosion, improper burner alignment, improper combustion air, etc.
The importance of thorough visual inspections on gas appliances
Some gas pool heater practices
Practical skills like setting gas pressure, checking for ambient CO, and leak testing
An in-depth look at each step of the gas furnace sequence of operation
Silicon carbide vs. silicon nitride ignitors (for HSI modules)
Flame rectification
Signs of problems like scorching or heat damage
What really causes back drafting and CO spillage
Above all, it is important to be attentive to potential safety issues, protect the client, and use opportunities to suggest upgrades that keep the customer safe.
Presentation: hvacrschool.co...
Adjusting Gas Pressure on a Standard and Gemini Furnace Valve 3D video:
• Adjusting Gas Pressure...
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Lessons for free? In this economy?
well to be fair, he is teaching his employees. May aswell video it and make money from youtube.
@@BRADASSOFFGRIDHOMESTEAD
😂
Good lesson Brian! One thing to be aware of when doing combustion analysis is to make sure you are sticking the probe before any kind of draft hood to avoid a false reading.
Thanks for the upload. I'm not a tech. I'm a homeowner and I'm getting my annual furnace inspection this Friday. I want to stay informed and learn about what the technician is doing.
Started as an installer learned everything on the job no school , starting to do maintenance now your videos helped a lot !
I haven't finished the video. But a combustion analyzer is a really good tool. I use to tune care as a mechanic and my AFR told me everything. Working hvac now, it can show me a cracked heat heat exchanger.
Also undersized gas flex, sounds like an elk bugle. I see it on commercial unit heaters quite often.
Thanks for the content. I'm a new tech out of utah. This was very educational and helpful.
Great Gas 101 session. Thank You!
It's crazy, here in MD 80% furnaces are pretty rare. Most are 90%+.
My techs get amnesia every heating season. Furnaces become a new invention 😂
As always, great content. Thank you. #furnace #hvac #heating #gas #enjoylife
Thanks for the valuable lessons that you all provided. Not all of us could afford paying for hvac courses that we need to excell in our trade.
Beautiful, thanks for the upload!
no surprise! i learn something every time my boy opens his mouth! thx bra
Thanks it’s time in N Ga.
Great class muy bueno
confirm the crack in heat exchanger by engergizing fan R-G then getting bbq lighter and sticking in each hole, see which one dances, thats the culprit
22:18 Gas furnace sequence of operation
Good vid
Pressure switch checked by board before inducer starts...I wonder how many times that knowledge gets forgotten.
Im new and had someone did exactly that with the lighter to the gas piping. Im like WTF are you doing! If you looked in the truck we have a gas detector. "Ive done this all the time" bla bla bla boomer talk. No thank you, I learned alot of stuff through the fire academy as well mr I do this all the time. What if a customer saw you doing that? What if you cant control the flame that shoots out because it was that loose? I appreciate the videos so much.
Brian sir. Question for u I am dealing with a heat pump dual fuel split system. Heat pump runs fine on cool mode and dual fuel, my problem is on heat pump mode my pressures sky rocket to 575 on both sides high and low and also gives me an ambient sensor code. How can I address this is this a restriction, on what side evaporation coil of exterior or overcharged?
My outdoor temp was 67 and dual fuel switch over/lock out is set to 40. Once it kick out the low ambient fault code remains on defrost board until I reset then cycle starts again. My pressures still rise to 575 on both sides
Is your gas furnace running at the same time as your heat pump? They should never run together
Can you share the pdf for sequence of operation, please?
there you go hvacrschool.com/heating-prep-furnaces
Thank you so much!
👍👍👍
My grandfather died in a house explosion due to a gas leak.
Floridians need gas to heat the home? Huh