User manual SCOTSMAN C2648 SERVICE MANUAL 11-2010

[. . . ] C2648 Service Manual Introduction The design of this modular remote cuber is the result of years of experience with remote ice machine refrigeration systems. Standard features of this product include front accessible on-off switches, always-visible indicator lights, mechanical assist ice harvest for extra efficiency, automatically adjusting water purge and a control system that optimizes system operation. The manual includes installation information, technical details, diagnostics and service parts. Note the Caution and Warning symbols when they appear on the product or in this manual. [. . . ] Although energized throughout the harvest cycle, a harvest assist piston does not move until the ice has become partially loosened from the evaporator plate by the action of the hot refrigerant gas passing through the evaporator serpentine. November 2010 Page 6 C2648 Service Manual The remote condenser fan motor is powered by the compressor contactor, so it will be operating during the harvest cycle. The operating water pump and purge valve will shut off when the purge level setting time has been reached, either the manual time or the automatic time. The inlet water valve will remain on until it fills the reservoir. The Ready to Harvest light will switch Off when the ice falls from the evaporator. Harvest continues until the ice slab is ejected from the evaporator and falls, opening the curtain. When the curtain opens, the magnetic reed curtain switch opens, breaking the circuit to the controller. If all the curtains re-close within 30 seconds, the controller switches the machine back into another freeze cycle. If any curtain switch remains open, the controller shuts the machine down and puts it into a standby position. November 2010 Page 7 C2648 Service Manual Electrical Component Details Compressor · Operated by the compressor contactor. Contactor · Operated by the controller and the high pressure cut out switch. When energized the Compressor indicator light will be ON. Water Pumps · Operated by the controller, one of them thru a NC relay. When the Pump light is ON during a Freeze cycle, both pumps should be operating. When the Pump and Purge lights are both ON, one pump will be ON and one will be OFF. Inlet Water Solenoid Valve · Operated by the controller. When energized, the Water Solenoid indicator light will be ON. Purge Valve · Operated by the controller. When energized, the Purge Valve indicator light will be ON. Energized for a time during harvest. Fan Motor · Remote condenser fan motor is on whenever the compressor is. High pressure cut out · There is a high pressure cut out switch that shuts the power off to the compressor contactor if the discharge pressure is too high. It is an automatic reset. Harvest Assist Solenoids · Operated by the controller through a relay. Cycles on and off at the beginning of a restart. Line voltage coil. Liquid Line Valve · Opened by the controller to start a freeze cycle. Hot Gas Valves · Operated by the controller through a relay. In parallel with the harvest assist solenoid. Cycles on and off at the beginning of a restart. [. . . ] Vari-Smart Check Out If the machine's sump water is below 40 degrees or so, the Vari-Smart will only signal Bin Full at the end of a harvest cycle. If above 40, it should do so at the beginning of freeze. The easiest way to check it is as follows: 1. Set the Vari-Smart on 32" (point the arrow to the A in Adjust) 3. [. . . ]