Rink

Start-up Checks and Maintenance A properly qualified person must start the refrigeration plant. In many arenas today, a refrigeration contractor does this. Prior to turning on any equipment, a number of procedures must be re-visited. All valves that were previously closed and tagged must be re-opened, including the water supply lines to the compressors and condenser. The proper level of primary refrigerant in the chiller must be confirmed. The correct oil level in each compressor's crankcase must be verified before it is started and then re-checked once the compressor is running. V belts on the compressors and condenser fan motors should be examined for tightness and alignment. Any fuses removed from electrical panels as part of the shut-down process must be re-installed, and all necessary electrical switches turned back on. Also, remember to check the battery inside any computerized controls and replace it if necessary. Prior to turning on the brine/glycol pump, the seal and coupling should be checked and the shaft examined for tightness and alignment. Once the pump is switched on, the brine/glycol level should be re-checked at the expansion tank and seals on the pump monitored for leaks. When the condenser pump is operated, the water nozzles must be checked again and the pump seal monitored for leaks. When all compressors and pumps are switched on and running, operating pressures and temperatures will begin to change. These must be observed regularly to confirm proper operating conditions. Carefully listen for any unusual noises that will indicate a problem, and follow up as necessary. Checks and Maintenance After Start-up Once the refrigeration plant has been successfully started, every operator is responsible on his/her shift for ensuring that the plant remains in good operating condition. This requires a number of checks that must be done daily on a per- shift basis, including: proper oil level in the compressors, liquid leaks in the system, adequate brine/glycol levels, proper refrigerant level at the chiller, plus monitoring all operating pressures and temperatures. Also, the condenser water tank must be examined for proper level and the buildup of any dirt or scale. As a result of the procedures listed above, some periodic maintenance may be required throughout the operating season. This may include such things as re-adjusting V belt tension, adding or draining oil (depending on primary refrigerant used), replacing worn couplings on pumps, adding brine/glycol and dealing with any electrical problems such as blown fuses, broken switches or faulty operating controls. It should be noted again that a properly trained and qualified person should perform any maintenance done on the refrigeration plant. One of the operator's most important tasks after start-up is that of maintaining an accurate logbook that records all operating conditions in the refrigeration plant plus any work done on the equipment. In many jurisdictions this is law. Please check all codes or standards that are applicable to your own arena so that you, as a supervisor or operator, clearly understand the responsibilities with respect to the logbook. The successful operation of a refrigeration system in today's arenas relies on a maintenance program that includes adequate funding for ongoing equipment maintenance or replacement, plus a partnership between owners, properly trained staff, equipment suppliers and contractors who are committed to keeping the system well maintained. This type of refrigeration system maintenance program will go a long way to contributing to a cost- effective, trouble-free season, which should be the goal of every arena. ★ 32 R INK MAGAZ INE march/april 2008 Condensers require regular maintenance before, throughout, and after the skating season. KEEP REFRIGERATED AFTER OPENING STAR PHOTO

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