Monthly Archives: July 2012

Index to all published Posts

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

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

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

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 | 16 Comments

Why Keep Coils and Filters Clean?

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

(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

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