Manitowoc FLAKE/CHIPLET QC0700 Service Manual

Also see for QC0700: Installation, use & care manual Building instructions Service manual Technician's handbook

Contents

Section 7 Refrigeration SystemPart No. 80-1214-3 7-5BEFORE BEGINNING SERVICEIce machines may experience operational problems onlyduring certain times of the day or night. A machine mayfunction properly while it is being serviced, butmalfunctions later. Information provided by the user canhelp the technician start in the right direction, and maybe a determining factor in the final diagnosis.Ask these questions before beginning service:• When does the ice machine malfunction? (night, day,all the time, only during the Freeze cycle, etc.)• When do you notice low ice production? (one day aweek, every day, on weekends, etc.)• Can you describe exactly what the ice machineseems to be doing?• Has anyone been working on the ice machine?• During “store shutdown,” is the circuit breaker, watersupply or air temperature altered?• Is there any reason why incoming water pressuremight rise or drop substantially?ICE PRODUCTION/QUALITY CHECKQuality CheckIce quality will vary with ambient and watertemperatures, and is measured by the amount of excesswater in the ice. An easy test is to squeeze a handful ofice. High quality ice releases only a small amount ofwater. As ice quality drops, more water can be removed.Generally speaking, higher incoming water temperatureresults in lower ice quality.Lower water temperature results in higher ice quality.Ice Production Check1. Run the ice machine a minimum of 10 minutes toallow the system to stabilize.2. Catch the ice in a non-perforated container for7 minutes and 12 seconds or for more accuracy14 minutes and 24 seconds.3. Weigh the container and ice, then deduct the weightof the container.4. Convert ounces to pounds.Example: 3 lbs. 12 oz. converts to 3.75 lbs.(12 oz. ÷ 16 oz. =.75 lb.)5. Determine the 24-hour ice production capacity.7 minutes 12 secondsMultiply the total ice weight by 200.14 minutes 24 secondsMultiply the total ice weight by 100.Example:Collected ice for 7 minutes 12 secondsTotal weight (minus container) = 3.75 lbs.3.75 lbs. x 200 = 750 lbs. of ice every 24 hours6. Compare the capacity to the 24-hour ice productionchart for the model being tested.Ice production checks that are within 10% of thecharted capacity are considered normal due tovariances in air and water temperatures. Actualtemperatures will seldom match the chart exactly.Revised 8/2003