Ice Machine Operation

Section 3

Ice Making Sequence of Operation

Initial Start-Up Or Start-Up After Automatic

Shut-Off

1. Water Purge

Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds to purge the ice machine of old water. This ensures that the ice-making cycle starts with fresh water.

The hot gas valve is also energized during the water purge, although it stays on for an additional 5 seconds (50 second total on time) during the initial refrigeration system start-up.

2. Refrigeration System Start-Up

The compressor starts after the 45-second water purge, 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 contactor. As a result, any time the contactor 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 restarts after the 30-second prechill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. The water fill valve will cycle on, then off one more time to refill the water trough.

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 lock has been surpassed.

HARVEST SEQUENCE 5. Water Purge

The water pump continues to run, and the water dump valve energizes for 45 seconds to purge the water in the sump trough.

After the 45 second water purge, the water pump and dump valve de-energize. (Refer to “Water Purge Adjustment” for details.)

The hot gas valve also opens at the beginning of the water purge to divert hot refrigerant gas into the evaporator.

6. Harvest

The hot gas valve remains open and 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 swings the water curtain out, 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 7. Automatic Shut-Off

When the storage bin is full at the end of a harvest sequence, the sheet of cubes fails to clear the water curtain and will hold it open. After the water curtain 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 water curtain. As the water curtain 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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Manitowoc Ice Q 800 manual Ice Machine Operation Section, Ice Making Sequence of Operation
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Q 800 specifications

The Manitowoc Ice Q 800 is a state-of-the-art ice maker designed to meet the demands of the modern commercial kitchen. Renowned for its reliability, efficiency, and advanced features, the Q 800 stands out as a favored choice among establishments requiring high volumes of ice, such as restaurants, bars, hotels, and catering services.

One of the defining characteristics of the Manitowoc Ice Q 800 is its production capacity. Capable of producing up to 800 pounds of ice per day, this machine can handle the rigorous demands of a busy environment. Its production cycle is optimized to ensure a continuous supply of ice, minimizing downtime and ensuring that staff have constant access to the ice needed for drinks, food preservation, and other uses.

The Q 800 utilizes the innovative Manitowoc SmartClean technology, which significantly reduces the time and effort required for cleaning. This feature ensures that the interior components are maintained in prime condition, ultimately extending the lifespan of the machine. The automated cleaning system activates a deep-cleaning cycle that aids in bacteria control and ice quality, providing peace of mind for food safety.

Moreover, the unit incorporates an advanced air filtration system that minimizes dust and debris intake. This not only improves operational efficiency but also enhances ice quality by reducing contaminants. The air-cooled condenser system is designed for optimal energy efficiency, reducing electricity costs and contributing to a more sustainable operation.

The control panel of the Manitowoc Ice Q 800 is designed for intuitive use. With straightforward push-button controls, operators can easily adjust settings, initiate cleaning cycles, and monitor production and performance at a glance. Additionally, the machine features a durable and compact design, fitting snugly in most kitchen layouts while maintaining an easily accessible service area for maintenance.

With its combination of efficiency, advanced technology, and a user-friendly interface, the Manitowoc Ice Q 800 continues to uphold its reputation as a top-tier ice-making solution in the foodservice industry. Whether for creating refreshing beverages or chilling food, the Manitowoc Ice Q 800 is engineered to deliver superior performance for any commercial kitchen operation.
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