I see techs in the field get the most frustrated when they have a low-voltage short they can’t seem to locate. The challenge techs face with low voltage diagnosis is a combination of poor process and some root misunderstanding about what they are looking for.
HVACR technicians are special individuals. They have the intelligence, aptitude, and knack for problem-solving. In fact, they are expected to know how to diagnose and troubleshoot equipment of all types, sizes, and ages.
This app is derived from the proven troubleshooting charts in Refrigeration Training Services’ HVACR instructor CDs and book, “Commercial Refrigeration for Air Conditioning Technicians.”
This troubleshooting problem involves a 5-ton, R-22 rooftop air conditioning unit, and the customer’s complaint is that on days when the ambient temperature exceeds 90°F, the system doesn’t keep the store, which was recently remodeled, comfortable even though it seems to be running continuously.
Energy efficiency was the name of the game for Regal Beloit Corp., which debuted several new energy-efficient products, including the GlacAir™ motor and fan and Browning® Toolbox Technician motor efficiency calculator app, at the 2018 AHR Expo.
Tackling winter humidity issues can be a nightmare if you don’t have a grasp on the foundational principles that influence them. Have you ever wondered what causes some homes to be too dry even with a properly operating humidifier?
Bob and Tim arrive at the jobsite of a new customer. The customer is the owner of a shopping center that has a branch post office as one of its tenants. The complaint has been that the system is not controlling the indoor temperature in the postal facility. Tim tells Bob as they are arriving that the service ticket says that they are to service a 20 ton split system that uses a hot water coil for heating and an air conditioning coil and condensing unit for cooling. They are to do routine maintenance on the entire system.
In this troubleshooting situation, the customer is complaining that their comfort cooling system isn’t performing as it should. Their description of the problem is that the house always seems to be too “sticky”. They also say that the problem seems to be especially evident when the outdoor ambient reaches its highest level in mid-afternoon.
The outside temperature was 40°F, not really cold for the season but the humidity was high in the air. Moisture had just seemed to be laying in the air for several days.
Bob and Tim were called to a residence which reported a frozen heat pump. They arrived and talked to the housewife and she said, “My heat pump outdoor unit is a solid block of ice. When I look at my neighbors outdoor heat pumps they don’t look like mine. I think something is not right."
They all went to the window in the dining room and looked down on the heat pump outdoor unit and sure enough it was loaded up with ice.
