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Special considerations must be taken when installing condensers in cooler climates. During the colder weather, a winterizing valve should be utilized to maintain head pressure. This valve is actuated by a pressure difference between its inlet and outlet. The figure shows a “Winterstat” brand. Other valves may be used such as a “Headmaster” valve. If system pump-down is a desired feature, the receiver must hold the normal refrigerant charge plus the condenser charge with the bypass valve operating ̶ that is, partially open or intermittently opening and closing.EXCERPT FROM “TOOLS, CONTROLS AND TROUBLESHOOTING“, available from the ONLINE STORE at RSES.ORG.
New, from Klein Tools!
Most supermarkets have a considerable number of glass door display cases.
This article will focus on frozen food cases that use direct expansion evaporators, and that are connected to supermarket rack systems that use HFC refrigerants.
Be prepared-remember that good troubleshooting requires a thorough understanding of the basics.
The service engineer should know the normal system operation, since a large part of troubleshooting is visualizing what is happening throughout a system.
One tool to aid the troubleshooter in understanding the system is the electrical flow chart provided by many equipment manufacturers.
Avoid the bad habit of skipping steps in the process.
Try not to draw quick and usually inaccurate conclusions before a complete analysis.
For the testing process, good, reliable test instruments are among the most valuable tools that any service technician can have.
Electrical meters are so commonly used by service technicians that most take them for granted. Rarely are meters considered a source of potential danger. But the electrical meter, being as versatile and easy to use as it is, can very easily become the path of current between the power supply and the technician!
In most cases, the voltage supply for HVACR equipment does not exceed 600 V. For such applications, it is important to use a meter with a Category III 1,000-V rating minimum. This rating means that the meter has the proper circuit protection (fusing) and insulating leads to be used safely in most HVACR applications. This figure shows a typical digital multi-meter.
It is a source of great satisfaction for the business owner when he can point to significant achievements on the road to success. Each achievement serves as a milestone, is a reward for past efforts, and provides hope and encouragement for future victories.
There have been many milestones along the way for Steve Tibbetts, founder and president of T&O Refrigeration, located in Fayetteville, GA. Together, all of T&O’s successes signify a journey of high excellence in the challenging and ever-changing world of supermarket refrigeration.