LETS GOOO LOL

Laugh Out Loud w/ me!

So , It’s frowned upon by the industry and I love it! The DIY Network doesn’t have people trying to really help you guys learn about heating and cooling. And sometimes when they do it is either too dry , or too hard to understand.

Let’s keep in simple , laugh and learn while doing it.

My goal with this whole site will be to assist handy homeowners with repairing their HVAC System. As for someone who just wants to learn a little more about their heating and air conditioning, it can help them too.

Honestly, any homeowner can benefit from this.

If you are someone who likes to do it yourself , but hasn’t attempted any air conditioning and heating repairs, this will help !

I was never good with schooling , hell that’s why I took up a trade! That being said, if you’re anything like me and didn’t take well to the structure of schools, I’m sure this site will even be able to help.

Even newcomers, apprentices. Whether you’re thinking of starting your apprenticeship.

Send some feedback , always wanting to Improve

Sincerely,

That Guy



Gas Furnace Sequence Of Operation

Let’s talk about the Furnace Sequence of operation, how easy it can be to understand your Gas furnace !

Some people like to make HVAC difficult. For a homeowner just trying to repair his stuff, with the right person at their side, it can be very easy and lot of money saved !

Let’s do it !

Tired of paying someone else to fix what you can do yourself ? Using minimal amount of tools.

Keep reading to learn how your furnace works. And as a bonus the top 10 problems you will see !

–Thermostat is raised at least one degree.

– Inducer motor starts up

-All safety’s proven

–Ignitor starts to glow

–Gas valve opens up allowing gas to flow

–Ignitor ignites gas, flames carry over to, lighting all burners

– Flame sensor sense flame and continues heating.

– After a set amount of time. Approx a minute, the system will allow the heat exchanger to heat up……… -Once heated the blower motor will then turn on to move hot air throughout the home.

Aaannndd its as easy as that.



Okay, now that You have the sequence down. Let’s get more into the components and what they do. You can check out my slide show presentation if you’d like , click here! Or my live video here.

FURNACE PARTS

Inducer Motor– Exhausts flue gases out the chimney for 80% AFUE Furnaces as seen in this picture. For 90% AFUE Furnaces it is direct vented out side of home by way of PVC.









Blower motor– what moves the air through your ducts. Recycling air in the home. By sucking in room air temperature through returns in the home and crossing that air over the sealed heat exchanger, thus creating warm air.











Pressure switch– your vent safety switch that has electrical contacts (low voltage) and an internal diaphragm that hits the internal electrical switch, when inducer turns on ramping to full speed.

TIP: If vent is blocked. Switch won’t close. No heat occurs











Hot surface ignitor- A heating just like the one in your oven. Glows and ignites gas.

TIP: If you have a bad ignitor , you may smell gas by furnace.

Furnace ignitor (2 wires) Opposite end has molex connection











Flame sensor (1 wire)



Flame sensor- A safety that senses the flame and either keeps everything running once flames lit , if clean , or if dirty will cut flames off after 15-30 seconds or so. If ignitor is bad this safety will close the valve once not sensing a flame.

High Limit- This is the safety that opens up when an overheating situation occurs. Automatically resets.







Flame rollout switches– Safety’s that open when flames roll out or it starts to overheat due to heat exchanger issue and some other causes









Gas valve- this will receive low voltage (24v) and open up allowing gas to pass through line to burners and through orifices.

Gas valve , burners , rollout switches







Burner Orifices- Small brass component screwed into units gas manifold – it is in like with each burner and is basically a smaller hole

Gas burners- Inshot burners that distribute the flame properly

Blower motor (Run Cap) Any capacitor is much like a battery. For motors. It stores electricity and gives it back upon motors operation.

Control board- This is the brain. The mother board. All things start here basically. Has every electrical connection high and low voltage to tell the gas furnace what to do











Transformer- this is a device. Either internal or external to the board. Or both. That reduces the voltage from 120v to 24v.











Door switch- 120v safety. If the door isn’t on all the way or if it is internally or physically broken. Nothing happens. Not even step one in the furnaces sequence of operation

Emergency switch- Electrical shut off to furnace. Usually located next to furnace. If furnace in basement it should also Switch at top of steps. And if in attic. It should have one either at bottom in hallway. Or right when you get up in attic. For safety

Should have red plate 🤦🏻‍♂️









Branch line shut off valve (gas)- this sure off the gas only to the furnace.













Squirrel cage (wheel)- this is the wheel that cups and throws air making you feel good.













The Top 10 Most Common Problems w/ gas Furnace.



👇🏼







– Dirty flame sensor – flames carry over to flame sensor. However after 30 seconds or less the flames will shut off. You will then see the igniter glow and the process restart. It will try 3x automatically then lock out allowing just blower to run , blowing cold air. Most likely will be flashing a code to point you in the direction of issue

– Bad thermostat – most common symptom will be the unit not turning on at all. However there are some instances where the system won’t turn off.

– Bad hot surface igniter – you will get to #3 on sequence. Then you will not see the igniter glow but will hear gas coming out and will smell gas. Don’t be alarmed, the flame sensor will not sense flame and that is why it’s turning flame off. After 3rd try it will lock out same way mentioned above.

– Bad blower motor capacitor – you will get to step #8 and Just hear a humming. Motor will not start.

– Pressure switch – you will get to step #2 and that’s it. Inducer motor will continue to run , nothing else will happen afterwards.

– Blower motor – same symptoms as above. Motor will be trying to start but can’t. However one difference could be that you smell burning. Shut emergency switch off of this is your issue.

– Control board – A lot many symptoms to list. I will be doing videos for each failure.

Gas valve – you will get to step #5. But no gas coming out. No flames igniting. Igniter will glow and then turn off. Trying 3 times as well

Transformer – many symptoms can occur. See video

Water leak 90% furnaces – usually from lack of maintenance , clogged condensation trap

MORE COMING SOON!!

Comment Below!

