Assessments - 4, GPA: 4
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3.3 Condenser Dissipates heat from the compressor and prepares the high pressure refrigerant for the capillary tube and ultimately the evaporator. 3.4 Condenser Cleaning It is very important to do this on an annual basis and as required. The condenser can be cleaned with a brush or compressed air. There are commercial condenser cleaners on the market that are acceptable. 3.5 Filter Replacement The Jet Spray unit comes with a foam type filter mounted on the inside of the side panel assembly. JT30 models have a filter mounted inside the rear panel of the chassis. These filters should be periodically removed and washed in warm soapy solution to remove dust and derbies. 3.6 Condenser Fan Draws air through the condenser coils and over the compressor to facilitate heat removal. 3.7 Dryer Cleans and removes moisture from the refrigeration system. The dryer should always be replaced whenever servicing or opening a refrigeration system. When ordering a dryer, specify model number and refrigerant type (or serial number) to insure the correct dryer is received. © 2000, IMI Cornelius Inc. - 9 Jet Spray (Cold) Training Manual 3.8 Evaporators There are two types of evaporators on the Jet Spray cold products, coil and dome. It is important on both to remember to keep product above the top of the coils to insure proper cooling of the product and correct operation of the cooling system. Sometimes there is an ice build up around the evaporator. This is normal. When operating a multiple bowl unit, it is necessary to have liquid above the level of the evaporators in each bowl, this balances the refrigeration unit. Never run with an empty bowl, fill with water if product is unavailable. 3.9 Air Flow It is very important to make sure that there is adequate air circulation around the machine. There should be a minimum of three inches of space all around the unit. Refer to the installation and owners manuals for additional information. 3.10 Refrigeration Charging Charging the capillary tube controlled system requires accurate charging equipment and technique. The amount of refrigerant in the system determines the operating pressures and temperature of the evaporators. It is necessary to utilize a refrigerant scale or graduated charging cylinder when charging the system. Load, ambient temperature, and operating conditions affect sealed system operating pressures. If the unit appears under charged, check for a dirty condenser. If the unit is running constantly but not cooling, the problem may be a low charge. If a low charge is suspected, it is recommended that the system is evaluated and leak tested. NOTE: Hooking up a high side hose to a system with a low charge causes a quarter or more of the charge to backup into the hose. This results in an incorrect reading. This is why operating pressures are not normally published. SYSTEM DETAILS - 10 -© 2000, IMI Cornelius Inc. Jet Spray (Cold) Training Manual 4. CONTROLS AND ELECTRICAL 4.1 Switches Separate spray and refrigeration switches are located on the front of each dispenser, excluding the JS7, JW6, and JW5. There are separate switches for each side of multi-bowl models. These switches can be tested by checking the continuity from one terminal to the other. They are either open or closed depending upon the position of the switch. 4.2 Spray Drive Motor Assembly To avoid electrical shock and death, use extreme caution when the access panels are removed and the power is ON. The spray drive motor assembly is located under the condensate tray. It is accessed by removing the front panel. Check to see if the motor shaft and magnet are rotating. Visually inspect the spray drive motor. If the power is ON and the motor is not rotating, check for line voltage at the terminal board. If power is present and the motor is not rotating, the motor will need to be removed to check for continuity. Disconnect power to the unit before removing the motor. The spacing of the drive assembly and the underside of the condensate tray are very important. Current production spray drive motor assemblies do not utilize the spacing lugs that are mounted in older units. When replacing the spray drive motor assemblies it is important to check for existing lugs. If they are present remove as per the instruction sheet that is included with the replacement part. . . © 2000, IMI Cornelius Inc. - 11 Jet Spray (Cold) Training Manual TROUBLESHOOTING 1. NO SPRAY 1.1 Pump assembly Be sure the spray switch is ON Check impella magnet. Impella should spin freely. If it does not, remove and clean both impella and support pin. NOTE: Check that the Impella assembly is in upright position, fins facing upward. Sugar and solids can crystallize and cause impella to bind. Do not allow these materials to dry on parts. Bearing in impella could be worn causing impella to scrap the base of the bowl. Replace the impella assembly. NOTE: Switch must be OFF when inserting the impella into the bowl to insure magnetic coupling. Long pieces of...
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