This tech tip was written with the guidance of Nikki Krueger, the Director of Marketing & Business Development at Santa Fe Dehumidifiers. Nikki has been a longtime contributor to HVAC School as a recurring podcast guest and presenter at the HVACR Training Symposium. Most of the illustrations and instructions came from Santa Fe's Ultra V […]

Each commercial rooftop unit (RTU) needs to be mounted to a curb. A curb supports the RTU and provides openings for the supply and return ductwork (which can be massive compared to what we see in residential and light commercial HVAC). Occasionally, we’ll need to do an RTU changeout and put in a bigger or […]

As HVAC technicians, our responsibilities extend beyond the mechanical and refrigerant systems. The electrical power supply is an often overlooked factor in equipment longevity. Protecting an HVAC system from damaging voltage fluctuations is a strategic step that reduces service calls and enhances the reliability of our installations. This guide will discuss the importance of voltage […]

In this podcast, Jeremy Smith joins us to discuss demand cooling in low-temperature applications that use R-22 refrigerant. R-22 is NOT an ideal low-temperature refrigerant because it leads to high compression ratios. The discharge gas also gets really hot and can burn up the oil in the system. (The head of the compressor is even […]

Today, Jeremy Smith joins us to discuss low-ambient conditions and controls, condenser flooding, and headmaster valves. He has also given us a companion article on those subjects, which you can read below. Download the podcast directly HERE. As always, if you have an iPhone, subscribe HERE, and if you have an Android phone, subscribe HERE. […]

Jeremy Smith goes over floating suction and floating head refrigeration strategies. He also talks a bit more about low-ambient equipment operation. Floating suction controls developed when we started using low-pressure controls on rack refrigeration. As the electronics advanced, we developed controls that could control temperature, which impacts pressure as well. Nowadays, controls can cross data […]