Chiller and condensing unit maintenance isn't one of those jobs that most technicians look forward to. In situations where the maintenance department is busy or understaffed, coil cleaning is likely to be deferred beyond the time when maintenance is actually required by the equipment.
The problem: a restricted liquid line after the receiver. Many technicians believe that when any part of the system's high side is restricted or plugged, head pressures will elevate. This simply is not the case, especially on a TXV/receiver system.
ICOR International has introduced the HFC refrigerant NU-22Bâ„¢ (R-422B).
Company officials said that the refrigerant has greater refrigerating capacity, and its operating characteristics are closer to HCFC-22 than its predecessor, NU-22 (R-417A).
Unquestionably, heat exchanger vessels do deteriorate and fail. But it is a myth that you have to wait for tubes to fail before you know which ones to replace. Through advancements in electronic technology, it is possible to identify defective tubes individually.
When troubleshooting walk-in freezers, technicians often find a frozen evaporator coil. Although there are several possible causes, one common cause involves the defrost system. In order to effectively troubleshoot this problem, a technician must understand the design and operation of the defrost systems typically used.
By the year 2000, it was time to do something at the Ronald McDonald House (RMH) of Connecticut. Complaints surfaced regarding inadequate ventilation and the comfort and control of temperature. Answers arrived from EMCOR Service/Tucker Mechanical, which recommended a ductless solution.
Bob Wilkins of International Service Leadership (ISL) helped kick off the group's recent three-day meeting by hosting an all-day HVAC Business Management class. His intention was to "break business basics down to the most common denominator."
The new leader of Excellence Alliance (EAI) used the organization's spring 2006 meeting to introduce himself to EAI members. Mike Baker, the EAI president and CEO, also took time out to talk about his vision for the organization with The NEWS.
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