Commercial HVACR Instructor @ Virginia Western Community College.
Sporlan power elements (thermostatic elements) that are pressure limiting—meaning they feature a Maximum Operating Pressure (MOP)—utilize specific refrigerant charges designed to prevent compressor motor overloading.
Head over to the app with the red button if you’d like to see a full service call for a downed process chiller.
Placing TXV sensing bulbs on the wrong suction headers causes a feedback loop where valves overfeed or starve the evaporator. This results in erratic superheat, fluctuating suction pressures, drastically reduced cooling capacity, and a high risk of liquid refrigerant flooding (slugging) back to the compressor.
Vertical angular shaft alignment refers to the angle difference between two coupled shafts when viewed from the side, meaning one shaft points slightly upward or downward relative to the other. Horizontal angular alignment is the same type of misalignment but viewed from above, where one shaft points slightly left or right compared to the other. In both cases, the shaft centerlines intersect at an angle instead of running perfectly parallel, which can cause vibration, premature bearing wear, coupling damage, and energy loss if not corrected.
Vertical Parallel Alignment: The centerlines of the two shafts are parallel, but the shafts are positioned at different heights. Horizontal Parallel Alignment: The centerlines are parallel in the same horizontal plane, but the shafts are offset side-to-side (left or right of each other).
A walk-in defrost timer (or “defrost clock”) manages the cycle between active cooling and coil-defrosting to prevent ice buildup. It uses an internal clock motor to slowly rotate a wheel with pins. At set times (usually 1–4 times a day), the pins trigger a switch that turns off the compressor and activates heaters to melt ice, before returning the unit to normal cooling.
Have you ever had to describe what something LOOKS like in order for someone to understand what you’re talking about? Or you try and google it but can’t find it? Try and learn AND commit to memory the precise names of what things are called and you will be surprised how clear and concise communication can up your game when working with others in this racket.
A dual pressure oil safety switch on a walk-in freezer compressor is basically watching two pressures at the same time:
* Oil pump discharge pressure
* Crankcase/suction pressure
It does not care about raw oil pressure by itself. It cares about the difference between those two pressures — called net oil pressure.
The compressor’s oil pump has to create enough pressure above crankcase pressure to force oil through the bearings and moving parts.
Posting content about a particular skill online is essentially inviting public observation of your performance, methods, and results, so constructive criticism naturally becomes part of the exchange. When people see someone demonstrate a skill, they compare it against their own knowledge, standards, and experiences. Some viewers will point out mistakes, inefficiencies or alternative techniques because the content itself creates an open forum for discussion and evaluation. In many ways, publishing skill-based content turns private work into a peer-reviewed environment where feedback, debate, and criticism are expected parts of participation.
Nothing boosts employee morale quite like finding proof of the boss’s mistake.
Component familiarization is critical in HVAC troubleshooting because you can’t diagnose what you don’t understand. Knowing what each component does, how it operates, and how it interacts with the rest of the system allows a technician to recognize normal operation versus failure conditions quickly and accurately. A technician who is familiar with the equipment layout, control sequence, and component function can isolate problems faster, avoid misdiagnosis, and troubleshoot with confidence instead of guesswork.