Videos

Several components hook straight up to the control, including the suction pressure transducer and electronic valves. The control should also be able to read suction pressure, coil temperature, and return air temperatures. Accessory boards can also hold a few connections, such as to more electronic valves and sensors. Eric verifies that all of those boards […]

Before Eric went to work on the motor, it had burned out, was replaced, and burned out again. He also notices insect nests in the panel, the contactor in the supply airstream, a missing keyway, and an oversized breaker, which are all less than ideal. The pulley also cannot spin and is in poor shape […]

Universal components work across all systems, such as modern thermostats; you can see thermostats on gas furnaces, heat pumps, straight-cool A/Cs, and more, and they’ll all serve the same purpose. The “Universal” identifier merely indicates a part that works across several systems regardless of OEM. Universal controls aim to be easy for technicians to use […]

The load is the part of an electrical circuit that does something. Examples include motor windings (inductive) and filaments in lightbulbs (resistive). When you run multiple loads in parallel with each other, you connect each side to the power supply. In a series circuit, the loads are connected to each other, not each to the […]

A common belt myth is that you need to tension a belt so that it has an inch of deflection. Many factors can affect deflection, including the pressure you apply to the belt, the belt’s length, and what the belt is made of. There are no hard, fast rules of thumb for working with belts. […]

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 […]