Occasionally a technician may need to temporarily add oil to a semi-hermetic reciprocating compressor to maintain an adequate oil level, if the oil has been trapped out in the evaporator or suction line. This additional oil should not be left in the system.
For years, refrigeration contractors and technicians have described compressors by their horsepower. Now such terminology is being phased out by at least one refrigeration compressor manufacturer in favor of capacity-based nomenclature.
New technology from Danfoss is offering compressor-drive packages that can achieve especially good energy savings in low- and medium-temperature applications, from 3,900 to 90,500 Btuh.
Would HVAC contractors be comforted to know that their insurance premiums slowed down to a respectable 9.2 percent increase in 2005? Or would they feel better knowing that fewer of their competitors are offering health benefits? These are the key findings of a recent study.
As the industry continues to look at creating cooling without R-22, compressor manufacturer Bitzer takes a look at using ammonia in some applications where R-22 had been the preferred refrigerant.
Even before a refrigerated truck sets out on its first trip, the checklist of what's needed in terms of technology can be extensive. Part of the successful equation for Camel Express is the inclusion of the TriPac auxiliary heating/cooling temperature management system from ThermoKing.
Time to talk ‘HOOPS'. No, not basketball hoops. The ‘HOOPS' here is Hot Oil Over Protector, a proprietary technology designed to minimize the time it takes to detect a thermal fault condition and react to it in order to protect a compressor.
A recent dynamic is component manufacturers working with OEMs on creating a refrigeration system. One example of such manufacturer involvement is Tecumseh. For five years now, the company has offered custom designed and complete refrigeration systems.
Today's commercial refrigeration market is demanding higher efficiencies, quieter compressors, and even non-HFC alternatives, according to manufacturer Embraco, which is responding to those demands with its NT and variable-capacity compressor (VCC) models, as well as CO2 prototype decks.
The tent business is booming and that's good news for HVAC contractors. Tents are becoming the choice for all types of temporary facilities. Paralleling this trend is the quest to air condition and heat them. Thus, tent contractors and end users are hiring mechanical contractors.
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