Tag Archives: reversing valve

Proper Charging with Sub-cooling Revisited

Sub-cooling seems to be a great mystery to a lot of service techs in the field yet, any unit with a TXV type metering device, should be charged by sub-cooling instead of super-heat. Since a TXV has a pre-set super-heat … Continue reading

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Spring Cleaning — Part 2

It has been a week since my last post, Day Light Saving started, and the temperature has been getting warmer.  At least around Chicago, the temps have managed to get into the 50’s.  Now, this temperature is still not where … 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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Spring Cleaning

Here it is, almost the end of February and the start of meteorological SPRING. Sure, the ground-hog saw his shadow meaning winter ain’t over yet but, for those readers in the U.S., daylight savings time starts March 8th , just … Continue reading

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How to repair a HEAT PUMP — in seven easy steps!

Winter is about half over and I’m sure we are all looking forward to the end of this heating season (especially the New England area and all their snow). I  figured a little “just for fun” post might be needed about … Continue reading

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Compressor Replacement — Heat Pump

In the past, I have written a post on compressor replacement in air conditioners, but is there anything special that should be done when replacing a compressor in a heat pump?   We need to keep in mind that Heat … 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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Mis-diagnostics of Time/Temperature Defrost Boards in Split Heat Pumps

In a previous post, I mentioned that control boards are replaced and there is really nothing wrong with them. In recent months, there has been an increased number of defrost boards from split system heat pumps returned for warranty.  In-house testing of … Continue reading

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Refrigerant Line Charge Adders

I am often asked how much refrigerant should be added to a split system?  We preach that the best way to charge a new install is to always WEIGH the charge into the unit. Well, that varies from manufacturer to manufacturer.  … Continue reading

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Heat Pump Cooling Basics

What is a heat pump?  It is an air conditioner that contains a valve that allows it to alternate between heating and cooling. Yes — it is an AIR CONDITIONER.  Some times we forget that fact — but a split system heat … Continue reading

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