The Texas Chapter of the Air Conditioning Contractors of America (TACCA) kicked off its 2002 Fall Conference with a speech from a familiar Texas face. Daryl Johnston, former running back for the Dallas Cowboys and current TV broadcaster for Fox Sports, spoke about “Opportunities for Success.” Johnston should know a little about success, having played on three Super Bowl-winning teams.
Taking shortcuts while servicing refrigeration equipment can lead a technician to make costly mistakes. Not only can these mistakes be expensive; they can also cause harm to the equipment, as well as the technician.
The industry has developed multiple lengths of transducer-type liquid level probes for use with halocarbon refrigerants. Such controls are often focused directly on supermarket racks. The application supports monitoring, performance, and charge management, as well as troubleshooting, via a central microprocessor-based control panel.
In current designs, the electronics controlling the valve are separate from the valve itself. The correct term is therefore electronically controlled electric valves. Since electric valves are assigned their function in the system by the software in their controller, an electric valve can be used anywhere in the system — as an expansion valve, discharge gas bypass valve, evaporator control valve, heat reclaim valve, head pressure control valve, or crankcase pressure control valve. Several designs have evolved to meet different applications.
Modern supermarkets offer fresh fruits, vegetables, meats, and seafood, often from distant locations. Rapid refrigerated transport ends up being an important part of the food delivery equation. Once fresh food products leave the farm or the processing plant, proper temperature control is essential.
Key issues that were explored at the Aire Serv Fall Conference included training, marketing, and insurance. Attendees heard from Aire Serv franchisees and outside vendors over the duration of the three-day conference, which was designed to help attendees improve their businesses.
Wine cellars need to have a limited ambient temperature range and precise humidity control. But of most interest to HVAC contractors are the wine coolers used by some wine connoisseurs and most restaurants.
Pressure controls serve various functions, which may be divided into control and protection functions. Examples of control functions are compressor cycling, pumpdown, or defrost control. Protection functions included pressure limiting and cutout against excessive pressures, against loss of charge or for freeze protection.
What is the role of air filters in controlling mold? What air filtration efficiency is necessary to remove airborne spores? These are some of the questions HVAC contractors are asking filter suppliers to address regarding their concerns about mold. To answer these questions, Camfil Farr of Riverdale, NJ, says it has become one of the first filter manufacturers to develop specific guidelines on air filter selection for mold control in heating and cooling systems.
In 1997, during a period marked by numerous acquisitions of contracting firms by publicly traded consolidation groups, Gary Doty saw a good exit strategy for leaving the HVACR service business — at a very handsome selling price. On Sept. 30 of this year, Doty bought back his old company and was again an independent owner.