Monthly Archives: July 2012

Index to all published Posts

Posted on July 31, 2012 by yorkcentraltechtalk

I am on Vacation for the next week so there will not be any new posts until I return on 8/14.  But if you are new to this site, here is a list of posts that you can keep as … Continue reading →

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Compressor Valves / Internal Relief Diagnostics

Posted on July 31, 2012 by yorkcentraltechtalk

I was recently asked the question, “How can I determine if I have bad valves in a reciprocating compressor or if the internal relief on a scroll compressor is going bad?” These are good questions and I’ll address each individually!  Whether the … Continue reading →

Posted in HVAC Tech Support | 18 Comments

Troubleshooting Cooling – Old Sunline Units

Posted on July 26, 2012 by yorkcentraltechtalk

The older Sunline units, before Simplicity boards were introduced, had a “lock-out” relay board in the units.  All of the safeties were wired in series and, if any one of them opened, it would engage the lock-out relay, shutting down … Continue reading →

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Air flow Effects on Air Conditioning – Revisited

Posted on July 20, 2012 by yorkcentraltechtalk

In my last post, we discussed the importance of keeping coils and filters clean and their effect on operating cost and longevity of the equipment.  We concentrated mostly on the outdoor condenser coil.  Now we will look at the effects … Continue reading →

Posted in Commentary, HVAC Tech Support | 18 Comments

Why Keep Coils and Filters Clean?

Posted on July 13, 2012 by yorkcentraltechtalk

If I don’t keep the coils and filters clean, what can I expect? Loss of cooling capacity. Premature component failure. Lack of humidity removal. Compressor failures. Higher than necessary electric bills. Excessive repair bills. Most modern air conditioners are operating … Continue reading →

Posted in Commentary | 1 Comment

Leak Repair – Packaged and Split Units with R-410a and P.O.E. OIL

Posted on July 9, 2012 by yorkcentraltechtalk

(Information in this post was provided by Bruce Porter, Manager UPG Field Service. Bruce has written many application bulletins for UPG and is well-respected for his expertise in the HVACR field.  He also teaches HVACR at Metro Technologies Center HVAC) The leak repair process for … Continue reading →

Posted in HVAC Tech Support | 4 Comments

Volatage Imbalance in 3-Phase Systems Commentary

Posted on July 3, 2012 by yorkcentraltechtalk

I received this comment from Bruce Porter, Manager UPG Field Service. Bruce has written many application bulletins for UPG and is well-respected for his expertise in the HVACR field.  He also teaches HVACR at Metro Technologies Center HVAC.  I felt it was important enough to … Continue reading →

Posted in Commentary, HVAC Tech Support | 2 Comments

Voltage Imbalance in 3-Phase Systems

Posted on July 3, 2012 by yorkcentraltechtalk

As part of my ongoing series of electrical diagnostics for air conditioning systems, in this posting we will discuss voltage imbalance in 3-phase systems. Most technicians know low voltage causes problems with motors, compressors, and other components in a HVAC system. … Continue reading →

Posted in HVAC Tech Support | 9 Comments