valutazioni - 2, GPA: 3.5
(
)
)
|
Facilità d'uso
Discard ice and Sani-Sponges (Fig. 12). 12 Service Icemaker operation (all models) Follett’s icemaker consists of five distinct functional systems covered in detail as follows: • Water system • Electrical control system • Mechanical assembly • Refrigeration system • Bin full The Horizon icemaker overview The Follett Horizon icemaker uses a horizontal, cylindrical evaporator to freeze water on its inner surface. The refrigeration cycle is continuous; there is no batch cycle. The evaporator is flooded with water and the level is controlled by sensors in a reservoir. A rotating auger (22 RPM) continuously scrapes ice from the inner wall of the evaporator. The auger moves harvested ice through the evaporator into an ice extrusion canal. The ice is forced through a restrictive nozzle that squeezes out the water and creates the Chewblet. The continuous extrusion process pushes the Chewblets through a transport tube into a dispenser or bin. A solid state PC board controls and monitors the functionality of the ice machine. In addition to sequencing electrical components, the board monitors various operational parameters. A full complement of indicator lights allows visual status of the machine's operation. Additionally, the PC board controls the self-flushing feature of the icemaker. The evaporator water is periodically drained and replenished to remove minerals and sediment. A unique “bin full” detection system is incorporated in the Horizon icemaker. A switch located at the ice discharge port of the machine detects the position of the transport tube. When the bin fills up with ice, the transport tube moves out of the normal running position, and the switch turns the ice maker off. A domed housing at the end of the transport tube contains the ice extrusion loads during shut down. water inlet auger compression nozzle ice transport tube Harvest system diagram 13 Water system The water level in the evaporator is controlled by a feed solenoid and level detecting sensors. Referencing the diagram below, water sensing rods extend down into the reservoir at the end of the evaporator assembly. The system works via electrical conductivity as follows: One of the longest probes is a common. When water is between any of the other probes and the common, the PC board will sense the activation. During normal operation, the water level rises and falls between the Normal High and Normal Low sensors. As water is consumed to make ice, the level will fall until the Normal Low sensor is exposed, triggering the water feed solenoid on. Water will fill until the Normal High sensor is activated. Note: The potable water dissolved solids content must be greater than 10 ppm for the water control system to function properly. If using reverse osmosis water filtration system, ensure T.D.S level is greater than 10 ppm. Alarm LO Normal HI Common Normal LO Normal operating range Water system diagram Water level diagram CPU CPU CPU LO WATER LO WATER LO WATER HI WATER HI WATER HI WATER DRAIN CLOG DRAIN CLOG DRAIN CLOG 3. Ice machine is not making ice. 3. Normal purge indicator. After a selected period of ice 2. Ice machine is not making ice. 2. Normal time delay. When the bin fills with ice, the LOW BIN POWER POWER POWER HI PRESS HI PRESS HI PRESS HI AMPS HI AMPS HI AMPS SERVICE PURGE CLEANING SERVICE PURGE CLEANING TIME DELAY TIME DELAY SERVICE PURGE CLEANING TIME DELAY REFRIG ON REFRIG ON REFRIG ON AUGER ON AUGER ON AUGER ON LOW BIN LOW BIN LOW BIN making time has elapsed (1 or 2 hours), the ice machine will automatically self-flush. The compressor will shut down but the fan and gearmotor will continue to run. After the flush is complete the machine will refill and start without a time delay. light goes out and the refrigeration and auger drive systems immediately shut down. (Note: The fan motor will continue to run for 10 minutes to cool condenser) The TIME DELAY light comes on, initiating the time delay period. When the time delay expires, the machine will restart provided that the LOW BIN light is on. Electrical system Normal control board operation The PC board indicator lights provide all the information necessary to determine the machine's status. Green indicator lights generally represent “go” or normal operation; Yellow indicators represent normal off conditions; Red indicators generally represent alarm conditions, some of which will lock the machine off. A green light labeled POWER indicates power to the machine. A flashing green light labeled CPU is normal and indicates that the Central Processing Unit “heart beat” is working. All other normal operation status indicators are covered as follows: 1. Ice machine is making ice. 1. Normal running. Ice machine disposition Operating conditions ON OFFLegend: ON or OFF FLASHING 14 Test points: The Horizon PC board incorporates on-board test points that can be used to determine various electrical outputs. The test point holes allow a standard probe to be inserted for quick voltage measurement. For ...