Tag Archives: heat pump

Plenum Returns – Good or Bad?

I recently had this question sent to me —“What are your thoughts regarding plenum returns verses duct returns. One of the obvious is cost but how about system performance.”   Great question! In my opinion, I have always said that … Continue reading

Posted in Commentary, HVAC Tech Support | Tagged , , , , , , , , , , , , , , | 2 Comments

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

Posted in HVAC Tech Support | Tagged , , , , , , , , , , , , , | 5 Comments

Maintaining Equipment Efficiency

I participate in a blog called HVAC SERVICE SELLING  and this was posted on the site by Robert Baker who does commercial heating and cooling.  I felt this tied in nicely with my “Spring Cleaning” series of posts and thought I would pass … Continue reading

Posted in Commentary, HVAC Tech Support | Tagged , , , , , , , , , , , , , , | Leave a comment

Compressor Electrical Diagnostics — Revisited

In reviewing posts from time to time that have the most views i feel it is a good thing to bring back a post that was previously written.  The following was originally written back in 2011 but there have been … Continue reading

Posted in HVAC Tech Support | Tagged , , , , , , , , , , , , , , , , , | Leave a comment

SUPER-HEAT as a Diagnostic

Whether you are working on a 1½ ton unit or a 50-ton unit, the principles of the refrigeration cycle is the same.  The most important thing to remember about compressors is that they are VAPOR PUMPS. Compressors do not like … Continue reading

Posted in HVAC Tech Support | Tagged , , , , , , , , , , | 11 Comments

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

Posted in HVAC Tech Support | Tagged , , , , , , , , , , , , , | 4 Comments

Spring Cleaning — Completing the Maintenance

In this last part of my Series on “Spring Cleaning” (maintenance), we will now actually start the unit and do some checks with the unit operating.  You need to remember, SAFETY IS ALWAYS FIRST  when working on any live equipment. Make … Continue reading

Posted in HVAC Tech Support | Tagged , , , , , , , , , , , , , , , | Leave a comment