DCS RF151, Руководство по обслуживанию

Страница: 8 / 44

6
harvest cycle in process will continue until the harvest cycle is complete. Once complete, all loads will de-energize and remain so
until the bin thermistor senses a temperature at or above the “start production” setpoint. A new production cycle will then begin.
During the first production cycle only (the switch was previously in the “OFF” or “CLEAN” position), the evaporator thermistor
temperature will be ignored until the circulation pump has run for two minutes. During all harvest cycles, the evaporator thermis-
tor temperature cannot terminate the harvest cycle until the water solenoid is de-energized. The grid cutter output will always be
energized during the harvest cycle, and for the first 35 minutes into the production cycle.
If during any production or harvest cycle, the selector switch is put into the “CLEAN” position, any cycle in process will be immedi-
ately terminated and a clean cycle will occur. The unit will then repeat the entire above cycle.
If during any production or harvest cycle, the selector switch is put into the “OFF” position, the cycle in process will be stopped and
all loads will de-energize and remain so as long as the selector switch remains in the “OFF” position.
If during any production or harvest cycle, the selector switch is taken out of the “ON” position, a lockout will be started during
which the compressor relay will not re-energize regardless of a switch position.
If during any production or harvest cycle, there is a power loss/interruption of greater than 25 milliseconds, a lockout delay will
begin and the compressor relay will not re-energize upon reapplication of power until the lockout delay is complete. The lockout
delay begins with the loss of power and is unaffected by duration of power loss. All other loads will operate normally during the
lockout.
The setpoints are as follows:
Stop ice: 35.0 degrees F +/- 2 degrees F •
Start ice: 43.0 degrees F +/- 2 degrees F •
Harvest: 11.0 degrees F +/- 2 degrees F •
Production: 45.0 degrees F +/- 2 degrees F •
Setpoint versus Temperature and Voltage (120VAC): +/- 3 degrees F •
1.12 operation - Selector SWitch iS in the “clean” poSition
IMPORTANT: The assumptions before proceeding are that water is supplied to the Ice Maker (see Section 1.8, Water Require-
ments), there is proper electrical power to the Ice Maker (see Section 1.7, Electrical Requirements), the drain is properly plumbed
or the drain pump is operating properly, and both bin and evaporator thermistors are not defective. The refrigeration system
components, compressor, condenser fan, and hot gas valve, are never on in the clean cycle.
Upon setting the selector switch to the “CLEAN” position during the production or harvest cycle, the clean cycle will immediately
start, terminating the harvest or production cycle. Refer to the Timing/Operation Diagram in Figure 1.3. The following sequence
will now occur:
LED indicator on the control will light for 10 seconds upon the start of the clean cycle. See Section 5.3, Electronic Controller, 1.
for LED location.
The water solenoid will energize for three minutes and then de-energize. The circulation pump will now energize. 2.
After 30 minutes, the circulation pump will de-energize and the drain solenoid will energize. 3.
After 75 seconds, the drain solenoid will de-energize and the water solenoid will energize. 4.
After three minutes, the water solenoid will de-energize and the circulation pump will energize. 5.
After 10 minutes, the circulation pump will de-energize and the drain valve will energize. 6.
After 75 seconds, the drain solenoid will de-energize. The clean cycle is now complete. 7.
All loads will remain off as long as the selector switch remains in the “CLEAN” position and the power is not removed and reap-
plied.
If at any time during a clean cycle the selector switch is moved from the “CLEAN” position, all loads except the drain solenoid will
de-energize (this includes the “OFF” position). The drain solenoid will energize for 75 seconds and then de-energize. The unit will
now operate normally according to whether it is in the “OFF” or “ON” position.1.
INTrOduCTION