Monthly Archives: May 2012

It has finally gotten hot and it seems we are fully into air conditioning season (let’s hope it stays fo a while).  With air conditioning season comes a whole other set of diagnostics that we probably all have forgotten over the … Continue reading →

With the introduction of Microchannel condenser coils, some service practices have changed from traditional copper tube and aluminum fin coils. It is important to understand that Microchannel coils hold a relatively small volume of refrigerant.  First thing to remember is … Continue reading →

Over the years, as technology changed and new products were introduced, we have made changes to the various control boards we have used in our roof top units. For many years we used a simple “lock-out relay” board — one … Continue reading →

York’s HYBRID system using our Affinity Modulating furnace and Affinity Heat Pump with the York Guard VI control, have a unique distinction of being able to run the heat pump simultaneously with furnace by simply adding a bonnet sensor between the … Continue reading →

As I mentioned in my last post, the reason most contractors do not use the OEM start kit is because they either don’t understand how it works or don’t know how to wire it into the circuit. First, let’s see … Continue reading →

To start off, why do we even need start gear on a compressor in the first place? It’s a good question and I will try to answer it. A compressor is designed with a certain amount of starting torque which … Continue reading →

MicroChannel coils consist of tubes with microchannels running through the tubes.  The fins are welded to the tubes.  The coil is constructed of all aluminum. Because the coil is all aluminum construction, care needs to be taken when cleaning the coil. Here … Continue reading →

Ordinarily, suction line accumulators are not necessary on A/C units if the system is piped correctly and all of the precautionary guidelines are followed.  Refrigerant suction line accumulators should only be installed on systems where liquid flood back to the … Continue reading →