DCS RF151, Service Manual

Page: 7 / 44

5
1.10 Drain pUmp
DCS Drain Pump can be used to drain water when a gravity drain is not practical. Refer to drain pump instructions supplied with
the drain pump for installation.
As with the gravity drain, it may be necessary to wrap the drain tubing from the Ice Maker to the inlet of the drain pump with
wrap-type insulation. CONDENSATION CAN FORM ON THE DRAIN TUBING AND CAUSE SURROUNDING WATER DAMAGE.
1.11 operation - Selector SWitch iS in the “on” 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.
Input power must be applied at all times for proper operation. Any interrupt will lockout the compressor for no less than seven
minutes and up to nine minutes and restart the mode of operation. Figure 1.3 below is the Timing Diagram/Operation for the
electronic control.
*
Figure 1.3
Upon setting the switch to the “ON” position, the water solenoid will energize for one and a half minutes and then de-energize.
When the bin thermistor senses temperature at or above the “start ice” setpoint, and the evaporator thermistor senses tempera-
ture at or above the “production” setpoint, the production cycle will begin. The circulation pump, condenser fan, and compressor
relay will energize. When the evaporator thermistor senses temperature at or below the “harvest” setpoint, the harvest cycle will
begin. The circulation pump and condenser fan outputs will be de-energized and the hot gas solenoid and the drain solenoid will
energize. The drain solenoid will remain energized for 45 seconds and then de-energize, after which the water solenoid will en-
ergize for two minutes and then de-energize. Loads will remain in this state until the evaporator thermistor temperature rises to
the “production” setpoint. Once the evaporator thermistor temperature is at or above the “production” setpoint, a new production
cycle will begin. If at any time the bin thermistor senses a temperature at or below the “stop ice” setpoint, any production or
INTrOduCTION