Monthly Archives: March 2012

Everything You Ever Wanted to Know About Capacitors

What is a capacitor and why are they needed in a system and how do I check them out? First of all, capacitors are only installed on single phase motors and compressors  Three phase motors and compressors do not use … Continue reading

Posted in HVAC Tech Support | 14 Comments

Discharge Temperature as part of a Diagnostic

 One diagnostic reading that techs seldom take or look at is the Discharge Line Temperature. The discharge temperature of a compressor can usually tell the servicing technician what is happening inside an A/C system.  The discharge of the compressor is the … Continue reading

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Condenser Service Data

In the past few postings, we have been discussing the refrigerant cycle and some diagnostics.  We have discussed how important looking at the whole system  is to assuring a properly operating system. We have looked at troubleshooting using temperature and … Continue reading

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RTU Filter Chart

In a previous posting, I have discussed the importance of proper air flow to assure proper operation of cooling and heating.  In my last posting, I had pictures of a dirty blower and evaporator coil and discussed how this can affect the … Continue reading

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REFRIGERANT CYCLE – Part 2

Hopefully you have read my previous posting and understand how a simple refrigerant cycle operates.  Now I will go into some diagnostics of the refrigerant side of a system. The first thing to remember is that refrigerant does not wear … Continue reading

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REFRIGERATION CYCLE (revisited) – Part 1

Here it is March already, spring is just around the corner, and summer will be upon us before we know it.  With this in mind, it is a good time to think about air conditioning again and how it all … Continue reading

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Run Away Heat in a Roof Top Unit

Every year about this time I receive calls about older packaged roof top units that the heat will not shut off even when the thermostat wires are removed.  This occurs mostly on the Sunline roof top units and is usually a result of the … Continue reading

Posted in HVAC Tech Support | 16 Comments