Bedienungsanleitung Manitowoc Q130 (Seite 18 von 40) (Englisch)

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Operation Section 3

3-2

Part Number 000001130 12/08

Ice Making Sequence of Operation

INITIAL START-UP OR START-UP AFTER

AUTOMATIC SHUT-OFF

1. Pressure Equalization

Before the compressor starts the hot gas valve is

energized for 15 seconds to equalize pressures during

the initial refrigeration system start-up.

2. Refrigeration System Start-Up

The compressor starts after the 15-second pressure

equalization, and remains on throughout the entire

Freeze and Harvest Sequences. The hot gas valve

remains on for 5 seconds during initial compressor start-

up and then shuts off.

At the same time the compressor starts, the condenser

fan motor (air-cooled models) is supplied with power

throughout the entire Freeze and Harvest Sequences.

The fan motor is wired through a fan cycle pressure

control, therefore it may cycle on and off. (The

compressor and condenser fan motor are wired through

the relay. As a result, any time the relay coil is energized,

the compressor and fan motor are supplied with power.)

FREEZE SEQUENCE

3. Prechill

The compressor is on for 30 seconds prior to water flow

to Prechill the evaporator.

4. Freeze

The water pump starts after the 30-second Prechill. An

even flow of water is directed across the evaporator and

into each cube cell, where it freezes.

When sufficient ice has formed, the water flow (not the

ice) contacts the ice thickness probe. After

approximately 7 seconds of continual water contact, the

Harvest Sequence is initiated. The ice machine cannot

initiate a Harvest Sequence until a 6-minute freeze time

has been surpassed.

HARVEST SEQUENCE

5. Harvest

The water pump de-energizes stopping flow over the

evaporator. The rising level of water in the sump trough

diverts water out of the overflow tube, purging excess

minerals from the sump trough. The hot gas valve also

opens to divert hot refrigerant gas into the evaporator.

The refrigerant gas warms the evaporator causing the

cubes to slide, as a sheet, off the evaporator and into the

storage bin. The sliding sheet of cubes contacts the ice

damper, opening the bin switch.

The momentary opening and re-closing of the bin switch

terminates the Harvest Sequence and returns the ice

machine to the Freeze Sequence (steps 3 - 4).

AUTOMATIC SHUT-OFF

6. Automatic Shut-Off

When the storage bin is full at the end of a Harvest

Sequence, the sheet of cubes fails to clear the ice

damper and will hold it down. After the ice damper is

held open for 7 seconds, the ice machine shuts off. The

ice machine remains off for 3 minutes before it can

automatically restart.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to fall clear

of the damper. As the ice damper swings back to the

operating position, the bin switch re-closes and the ice

machine restarts (steps 1 - 2), provided the 3-minute

delay period is complete.

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