Electric Heat Sequencers Explained (HVAC Training)

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Fieldpiece SC440 True RMS Clamp Meter with Temperature, Inrush Current, Capacitance and Backlight

Heat Sequencer

Modern Refrigeration and Air Conditioning

[taylerellis]

Im any HVAC pro 30 years. Sequencers are a thing of the past they were needed in the past to turn each element on one at a time to prevent the transformer up on the pole outside the home from blowing. With new transformers today they are 100% no longer needed. If yoy see a bad sequencer in electric heat repalce them with a contactor with lugs and up the wiring size to #10. Try to replace all push on terminals with eyelet type terminals as they prevent resistance to electrical flow that over heats and melts wiring. There are kits to replace the entire electrical heat system including all wiring, contactors, limits, safteys, elements, and breakers that are often less expensive than replacing individual parts and are very quick and easy to install. HKA-15C for example. These kits are all comming with contactors instead of sequencers like I said they are no longer used today as they are a failure point where contactors are much more robust.

[Robnord]

All my mobile home furnaces are gas because we're out in the sticks where propane rules, except one electric unit in the city...so thank you.
One thing worth mentioning for newbs; Wire used to replace crispy ones should all be high quality 105°C rated. The good stuff. Thanks for yet another informative vid Tad!

[Hvacmike]

I just started teaching hvac and have been recommending your channel to my students. Great content, much appreciated!

[damianmlamb]

Dude SAVED MY ASS! WOW THANK YOU ABOUT 400 DOLLARS WORTH OF CALLING SOMEONE YOU ROCK!

[countysecession]

Thanks for the video. I'm from west Texas. I bought 21 mobile home rentals in June. I'm learning about how to maintain them. The HVAC systems and the drain/sewer/septic issues are in a dead heat for what requires the most maintenance. I've learned tons about AC this summer and I got my first call for no heat yesterday.

[Alex-jooi]

Love the modern refrigeration and air conditioning. Gotta pick it back up. So much information it’s literally got every bit of knowledge you would need for the field

[kimberlyphillips]

Thank you so much for the very thorough explanation on how to do sequencers for my furnace out of all the ones I’ve seen on YouTube you are the best thanks again

[USA-GreedyMenOfNoIntegrity]

I always use 10 ga wire with good crimp terminals and you’ll have less overheating issues. Also good annual coil/drain cleaning, tape/silicone top of electrical compartment to keep water out will make your last longer.

[littleshopintheshed]

This exactly what just happened to us, but it was a heat strip relay that the contacts were welded closed. I bought a second for a back up, glad I did. After seeing you use the clampmeter, I did the same, found one of the other relays was clicking but not contacting. Thank you.

[seniorchief]

I installed one of these furnaces when we built the house in 1997. Never had a problem until last winter ended up having sequencers replaced twice about a month apart on two separate service calls. Finished out last winter ok. (Also had a couple of burnt wires each time). This past week it has started running uncontrolled again. When it does this I shut off the power for a while and after power on again it may run most of the day before before the problem repeats.

[michaelmartin]

I work in eastern NC and run into lots of mobile home units. Thanks for the video.

[michaelmaclachlan]

HVAC tech in Washington, thanks for the tip about going to the website to look up the specs on sequencers.

[justinmorrow]

Thanks Tad, was very insightful, good explanations. From Western NC, learned from your "customer complaints" part, and your diagnosis of the circuits of the sequencer.

[JoseLopez-gdtl]

Thanks man. ❤❤ you really know how to explain and I learn by watching you videos. God bless you sir.

[thehouseofhorsepowerautobo]

Thank you for taking the time to make this video and share! I'm having an issue with my intertherm electric furnace it will run for a bit heating only half what it normally does then in throws the breaker at the wall panel.

[skipanardoross]

Hoping someone here can give me some advice. I have some electrical knowledge but no furnace experience. Nordyne E3EB-015H blower made an unusual, sort of deep whir, sound and kicked its breaker. The fan is also hitting the enclosure slightly. I did a capacitor and resistance check on motor that seemed ok. I'll put the readings below. I couldn't feel any slop that would have been bearing related but there was some movement from the mounts. I thought that may have been ok since it has the rubber bumpers but, after watching another video, I believe that I should have tightened them. After reinstalling, the unit ran for a while before blowing warm air and shortly after that it sounded like it was changing speeds but then made the weird whirring noise and stopped. Instinctively the first thought is the motor/capacitor but I feel like something else is going on. I know that a relay was replaced about 8 months ago (I don't live there). Any ideas or advice? Readings: High = 25.7, Med = 29.7, Low = 37.7 Orange to Black = 22.6

[ColtonBarrett]

I'm getting ready to replace the OEM sequencer on my mobile home furnace. The replacement (an Emerson/White Rogers) has the labeling in a different order for the set of contacts (e.g., where M5 and M6 are on the old one it's reversed on the new one. On the old one, M5 is on the top terminals and M6 is on the bottom terminals, but on the new one it's the other way around). 

My question is should I still wire it exactly the same as the old one? From everything I've come to understand, this shouldn't matter, and I should be able to wire it exactly as it was on the old one. Wire for wire on the same terminals, regardless of this difference. 

Also, my old one has jumper wires, whereas the new one is already linked (like the one in the video). I'm assuming I no longer need those jumper wires? Not that I could connect them to the terminals with the link in the way anyway. I'm sure that seems obvious, but I just want to be thorough with regard to my limited experience.

[TheJohndeere]

My furnace has 4 elements and 3 stacks of sequencers. They burn out fairly often. I have probably replaced atleast 6 in 40 years. Would there be a way to use some heavy duty relays or magnetic starter in line between the sequencer and the elements to take the load off the sequencer. This way the sequencer would only have to supply the power to energize the relay instead of the large draw of the element.

[jessesmith]

I learned you are a great YouTuber!!! Thank you for the awesome video!!!

[jimmytindall]

Jimmy from Louisville ky I been looking on-line for a video like this I think u may have solved my problem I'll let u know when I get home