Tag Archives: free cooling

Indoor Coil Leaks

With A/C season officially here, I have been asked to address an issue that has been around our industry for a long time now and that is indoor coil leaks also known as formicary corrosion. Indoor coil corrosion failures are an … Continue reading

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Air Conditioning and Humidity Control

I recently received this question from one of this site’s readers: “Is it a good or bad idea to leave the ahu fan on in a commercial system?This facility is a bank and is experiencing a higher than normal moisture … Continue reading

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Spring Cleaning — Part 1

Well, here it is March 3 which places us in meteorological SPRING. (And, for those in the U.S., don’t forget that Day-light Savings Time starts THIS WEEKEND ). I know that those of us up north and out east are still dealing with … Continue reading

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TXV Issues — UPDATE

The purpose of this post is to provide UPDATED service guidance to address erratic thermal expansion valve performance which results in observed high superheat conditions, at times coincidental with compressor failure. Reports of failures of this type have been industry wide … Continue reading

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Subcooling Can Aid in Troubleshooting

Let’s take a trip back to the basics to understand subcooling in the first place. In a refrigeration cycle, the condenser converts a super-heated high pressure gas into a high pressure liquid so it can be used by the evaporator … Continue reading

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Cycling off A/C or Heat Pumps by Utility Companies Revisited

People are looking for ways to save money on their utility costs, especially, air conditioning.  To control the power usage in peak times, some Utility Companies regulate consumer usage by cycling off a consumer’s A/C outdoor unit at selected times during … Continue reading

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Spring Cleaning

Spring is officially here. Baseball season has officially started. The Final Four of College Basketball will be playing for the Championship. The schools are on spring break. So, what does this have to do with an HVAC blog?  I already … Continue reading

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New Honeywell Economizer Controls – Part 2

So, now that you have read my last post and have an “overview” of the new economizer control, we can get into the nitty-gritty of how to install and set-up, and diagnose the new economizer. The installation part is easy. The … Continue reading

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New Honeywell Economizer Controls

Spring is in the air (but we still have some snow too in the north central region) and as our thoughts turn to COOLING, we need to look at the ECONOMIZER.  Economizers still are the most misunderstood, misdiagnosed, most often … Continue reading

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100% Outside Air? (part 2)

In my last post, I “preached” that gas-fired roof top packaged unit should not be used as make-up air units with 100% outside air.  Now the question of attempting to use a unit  for 100% outside air in a cooling application … Continue reading

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