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Hersteller: Ice-O-Matic Dateigröße: 3.32 mb Dateiname: Unterrichtssprache:

When time is added to the freeze timer the length of the freeze cycle is increased, therefore the ice bridge thickness is increased. When time is removed from the timer, the freeze cycle is shorted and the ice bridge thickness is decreased. Freeze Timer Ice Bridge The freeze timer can be adjusted by sliding one or more switches to either the ON or OFF position to obtain the setting which will produce the proper ice bridge thickness. Ice bridge thickness on C/UC/EC/EUC/ECP200/300 models should be 3/16" (5mm), all other models should have a bridge of 1 /8" (3mm). If bridge is too thick remove enough time from timer to achieve proper thickness. If bridge is too thin add enough time to timer to achieve proper thickness. Note: The freeze timer on ECP models is located on the circuit board. It operates and is adjusted as described above. Check the freeze timer for proper operation as follows: If the machine has one evaporator, make sure that the high temperature safety is not open, see page F9. Turn the machine OFF and disconnect incoming power by unplugging the machine or switching the circuit breaker OFF. Attach one lead of a voltmeter to terminal 1 and the other lead to terminal 3 of the timer. Reconnect incoming power and turn the machine to the ICE position. The volt meter should read 0 volts until the timer initiate closes at which point the timer will energize and line voltage should be read. On dual evaporator machines before March 1998, relay 2 should energize when the timer initiate closes, if it does not check the timer initiate and relay 2, see pages F3 and F4. When the timer counts out the volt meter will again read 0 Volts. The time it takes the freeze timer to time out, once it has been energized, should match the timer adjustment. If it does not or if the timer never closes, the timer is defective. Harvest Cycle Dual evaporator models beginning March 1998: Once the freeze timer has counted out, power is sent through cam switch 1 and 2 to energize both harvest motors and relays 1 and 2. The relays supply power to the hot gas valves (one valve for each evaporator) and the purge valve. There is a 4 second delay before these components are energized. Each harvest motor turns a clutch assembly, the clutches should move enough to actuate both cam switches during the 4 second delay. Each harvest motor remains energized until it has turned the clutch one complete revolution. The cam switch then returns to the normal postion and the motor is deenergized. Once both cam switches return to the normal position the machine returns to the freeze cycle. The purge valve and water pump remain energized throughout the entire harvest cycle. Dual evaporator models before March 1998 and all single evaporator models: Once the freeze timer has counted out, power is sent to relay 1 and the machine enters the harvest cycle. Once in harvest, the purge valve, hot gas valve and harvest motor(s) are energized. The water pump continues to run during the first part of the harvest cycle so that mineral laden water remaining in the water trough can be pumped through the purge valve to the drain. The harvest motor turns the clutch assembly to actuate the cam switch. There is one harvest assist assembly (harvest motor, clutch, probe and cam switch) for each evaporator. The cam switch is in the normal position during freeze and at the beginning of harvest. Once the clutch turns far enough to actuate the cam switch the water pump and purge valve de-energize. The harvest motor continues to turn the clutch. When the the cam switch (both cam switches on dual evaporator machines) return to the normal position the machine returns to the freeze cycle. On single evaporator machines, if the bin switch (thermostat on under counter models) is open when the cam switch is actuated by the high part of the cam, the machine will shut off. On dual evaporator machines, if the bin switch is open when the cam switches return to the normal position the machine shuts off. Remote units pump down before shutting off. Relay 1 Dual evaporator models beginning March 1998: Relay 1 is controlled by the right side cam switch (cam switch 1) . When the time on the freeze timer passes, power is sent to relay 1 through cam switch 1. When relay 1 is energized contacts R-1A close to bypass the bin control and contacts R-1B close sending power to the hot gas valves and purge valve via the harvest delay timer. Relay 1 will deenergized once the clutch completes one revolution and cam switch 1 returns to the normal position. The operation of relay 2 is identical to relay 1 except that it is controlled by the left side cam switch (cam switch 2). If one or both relays are energized power will be sent to the hot gas valves and purge valve via the harvest delay timer. Both relays must deenergize before the machine returns to the freeze cycle.. Dual evaporator models before March 1998 and all single evaporator models: When relay 1 is energized, contacts R-1B clo...

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