Tag Archives: digital meters

4 Bad Boards in 4 Days! (a new record)

Posted on May 21, 2014 by yorkcentraltechtalk

Yes, the title of this post is exactly what a contractor had done on a unit — replaced 4 boards in 4 days. I finally got the call from the owner of the building, who was very frustrated and upset … Continue reading →

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“SMART METERS”, “THE SMART GRID”, and POTENTIAL CONTROL PROBLEMS

Posted on March 6, 2014 by yorkcentraltechtalk

More and more, we are hearing about the Smart Grid and the use of Smart Meters. Illinois has announced that they want the entire state to be on Smart Meters and have started replacing older meters with the new Smart … Continue reading →

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Economizers –Revisited Part 4

Posted on October 6, 2013 by yorkcentraltechtalk

In this fourth and final post on Economizers, I’ll try to go through troubleshooting the mod motor and the logic module.  In the last post, we went over the enthalpy sensors and discharge/mixed air sensors diagnostics.  Now we begin  with the … Continue reading →

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How Electricity “REALLY” Works

Posted on August 25, 2013 by yorkcentraltechtalk

A sheet of paper crossed my desk the other day and, as I read it, a realization of a basic truth came to me.  So Simple! So obvious we couldn’t see it.  One of our engineers had discovered how power … Continue reading →

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MCA and MOP — What are they and How are they Calculated?

Posted on July 20, 2013 by yorkcentraltechtalk

On commercial equipment, there is some information on the data plate  of the unit that has to do with safely wiring and protecting the equipment.  These ratings are the MCA and MOP. To start this discussion, we first need to know what … Continue reading →

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How to Test Capacitors

Posted on May 15, 2013 by yorkcentraltechtalk

I know I am dating myself and I really hate to say this, but “when I started in this industry” I learned to test capacitors with an analog volt-ohm meter (Simpson 260 VOM to be exact and still a great … Continue reading →

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