How to Check Continuity With Heat Sequencer
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I agree with tech it out if your confused about weather or not the sequencer is good or not... remove voltage from the contactor side of sequencer but leave control voltage on and I just use the audible continuity test to make sure the sequencer is closing it's contacts when your getting control voltage (if it beeps it closed)
- That is EXACTLY what I was trying to say, sorry tech it out. long day...
Originally Posted by RobFarns 
I agree with tech it out if your confused about weather or not the sequencer is good or not... remove voltage from the contactor side of sequencer but leave control voltage on and I just use the audible continuity test to make sure the sequencer is closing it's contacts when your getting control voltage (if it beeps it closed)
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I'm sure the original poster is now really confused.
- To funny I got it the first time Originally Posted by Tech it out
Okay, I give up. Nobody reads anymore
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- Why bother though, if you measure 240v across the the contacts when they should be closed, you already know the sequencer is bad. Originally Posted by RobFarns
I agree with tech it out if your confused about weather or not the sequencer is good or not... remove voltage from the contactor side of sequencer but leave control voltage on and I just use the audible continuity test to make sure the sequencer is closing it's contacts when your getting control voltage (if it beeps it closed)
It is better to test the circuit in normal operation anyway.
If the contacts are pitted/burned, it is not uncommon for them to sometimes close OK, especially absent the line voltage because of the lack of arcing as they close.
You can actually end up with a set of contacts that fails under normal voltage and current conditions, but passes a continuity test when it is not switching line voltage.Similar thing for a sequencer that is stuck closed.
The act of disconnecting the wires from it to do a continuity test can disturb it enough to cause the contacts to unstick and open.
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Agreed Mark. But the OP was asking how they worked, signifying he was unfamiliar with them enough to troubleshoot them. Sometimes when inexperienced on something you lack confidence. The ohms test was just a way for him to double check.
- I know that and you know that but I remember when I was new to the industry and some things that seem simple now were very confusing at times and it helped me to understand things if I reduced the number of things going on like in this case I remember doing the same thing (taking line voltage from sequencers to test only the sequencer) sometimes I would try and overthink things it helped me understand is all .. thought it might help this guy too. Originally Posted by mark beiser
Why bother though, if you measure 240v across the the contacts when they should be closed, you already know the sequencer is bad.
It is better to test the circuit in normal operation anyway.
If the contacts are pitted/burned, it is not uncommon for them to sometimes close OK, especially absent the line voltage because of the lack of arcing as they close.
You can actually end up with a set of contacts that fails under normal voltage and current conditions, but passes a continuity test when it is not switching line voltage.Similar thing for a sequencer that is stuck closed.
The act of disconnecting the wires from it to do a continuity test can disturb it enough to cause the contacts to unstick and open.
- I can't argue with yours & tech it out's logic but I do think its a bad practice to teach a tech to ohm out a sequencer when performing a real life diagnosis. Originally Posted by RobFarns
I know that and you know that but I remember when I was new to the industry and some things that seem simple now were very confusing at times and it helped me to understand things if I reduced the number of things going on like in this case I remember doing the same thing (taking line voltage from sequencers to test only the sequencer) sometimes I would try and overthink things it helped me understand is all .. thought it might help this guy too.
You're both correct as far as checking the operation in theory but in real life there are other variables to consider. A sequencer has a high rate of intermittent failures whether it be sticking closed or not opening. I would say the only time you would want to test a sequencer with an ohm meter would be if it was unsafe to access the terminals for testing with the power on.Gary
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The best things in life are free but not everyone is willing to pay the price.
- I agree it is Not the best way but it helped me understand the sequencer is all. Originally Posted by garyed
I can't argue with yours & tech it out's logic but I do think its a bad practice to teach a tech to ohm out a sequencer when performing a real life diagnosis.
You're both correct as far as checking the operation in theory but in real life there are other variables to consider. A sequencer has a high rate of intermittent failures whether it be sticking closed or not opening. I would say the only time you would want to test a sequencer with an ohm meter would be if it was unsafe to access the terminals for testing with the power on.
- Again someone need not reading enough of the thread to know what was previously posted. The ohm check was just if he wanted to make sure AFTER checking for voltage across the terminals of the sequencer. Although I am sure he is not even checking this thread anymore and neither am I after this. Originally Posted by garyed
I can't argue with yours & tech it out's logic but I do think its a bad practice to teach a tech to ohm out a sequencer when performing a real life diagnosis.
You're both correct as far as checking the operation in theory but in real life there are other variables to consider. A sequencer has a high rate of intermittent failures whether it be sticking closed or not opening. I would say the only time you would want to test a sequencer with an ohm meter would be if it was unsafe to access the terminals for testing with the power on.This thing has gone on and on over something as simple as a sequencer check. It has nothing to do with helping the OP anymore. There was nothing wrong with the explanation I gave on troubleshooting the sequencer, but if someone would like to they can start a whole new thread and explain how to properly do it. Please let this one DIE!
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amen
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Let no dead horse go unbeaten!
- Originally Posted by TACKERDOWN
amen
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Only 3 pages on how to test a sequencer.
Is that all?
Gary
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The best things in life are free but not everyone is willing to pay the price.
- Any way i could get to the attachment? Not sure why but it isn�t popped up for me to see. Thanks. Originally Posted by rundawg
See attachment.
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Maybe it�s like milk...... The thread spoils at the six year mark...
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It's All about Heat.............................to a degree
- Ding Ding Ding Originally Posted by under pressure
Maybe it�s like milk...... The thread spoils at the six year mark...
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We have a winner
- I think it may have been removed because I made the mistake of posting it in an "OPEN" forum. Originally Posted by under pressure
Maybe it�s like milk...... The thread spoils at the six year mark...
Instead of learning the tricks of the trade, learn the trade.
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Post Likes - 1 Likes, 0 Dislikes
- I do not post things of electrical in nature in "OPEN" forums as I mentioned above, and probably did by mistake earlier. Originally Posted by Beezler11
Any way i could get to the attachment? Not sure why but it isn't popped up for me to see. Thanks.
Your profile states you are a tech, but give us nothing of substance about you or your back ground.
My suggestion would be to completely fill out your profile, including an email address, so we can get to know you better.
After you do that, work on getting your "PRO" status which will allow you access into the "LOCKED" Pro forums where we do post manuals, wiring diagrams and things of a technical nature.
Instead of learning the tricks of the trade, learn the trade.
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Source: https://hvac-talk.com/vbb/showthread.php?1042651-Heat-strip-sequencer/page2
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