Videos

The condenser fans have been rewired. In the current configuration, the failure of one fan won’t take the other fans out. However, our main goal is to prevent fan failure altogether. We have moved the circuit board over to make room for the buck-boost transformers. Eric installed two transformers and drew out the schematic on […]

The remote headers for each rack are placed along the motor room walls, not within or immediately beside the racks. Each rack has multiple compressors that discharge compressed vapor into a single common discharge line. The discharge line leads to the oil separator, and then it leads to the heat reclaim or condenser. The oil […]

Commercial technician Eric Mele diagnoses improper dehumidification on a Seasons 4 system with reheat. He goes through the diagnostic process on the Seasons 4 RTU in the field. Eric starts by tracing the wiring so that he can understand exactly how the system is wired. He checks his control board to see where all the […]

As we experience more and more copper corrosion and pinhole leaks in ductless line sets, thorough leak detection and line isolation tests will become even more valuable procedures. First, you’ll want to perform a thorough leak check on the system. You may check for leaks with a pressure test. If there is refrigerant in the […]

In today's live stream, Eric Mele and Bryan talk about dehumidification and reheat on the residential and commercial sides of the HVAC industry. Recently, Eric diagnosed a commercial RTU that wasn't reaching the set dew point. In the hydronic system that Eric troubleshot, the analog output was flipped; it ran the valve for reheat in […]

proper system airflow You can learn more about the 2022 HVACR Training Symposium HERE. While Manual J deals with residential load calculations, Manual S deals with residential equipment selection. The equipment’s goal should be to maintain 70 degrees in the winter and 75 degrees in the summer (with a 62-degree WB). These are not Manual […]

You can find the long-line piping guide we’ve used HERE. Long lines can cause refrigerant migration. Long lines simply move more refrigerant, making migration much more likely. On top of that, a pressure drop is possible throughout longer suction lines. When you have a lot of refrigerant inside the suction line when a unit is […]

Many problems that occur during installations stem from poor duct design. Ductwork requires a lot more thought and planning than just using ACCA Manual D. Duct sizing is important, and HVAC systems often lose efficiency to takeoffs and return drops that are too small; Michael and Neil like to make the ductwork as large as […]

Ed has over 35 years of HVACR experience, both in the field and through teaching. He has lived and done business in New Jersey, which has a variable climate, and he has experienced a wide range of temperatures. When designing ductwork, we obviously want our static pressure to be close to our calculations. However, lower […]