Manitowoc QF2300 Manual de usuario descargar pdf (Pagina 7)

•VERTICAL EVAPORATOR DESIGN

Sequence of Operation

1 Before the compressor starts, the water pump

and water dump solenoid are energized for 45

seconds, to completely purge the ice machine

of old water after automatic shut-off. This feature

ensures that the ice making cycle starts with

fresh water.

The harvest valve(s) is also energized during

water purge, although it stays on for an additional

5 seconds (50 seconds total on time) during the

initial refrigeration system start-up.

When Used - The air compressor energizes for

the last 10 seconds of the cycle.

2 The compressor starts after the 45 second

water purge, and it remains on throughout

the entire Freeze and Harvest Sequences.

The water fill valve is energized at the same

time as the compressor.

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.

Freeze Sequence

3 The compressor is on for 30 seconds (60 seconds

initial cycle) prior to water flow, to prechill the

evaporator. The water fill valve remains on until

the water level probe is satisfied.

4 The water pump restarts after the 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 and

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 10 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.

Figure 1. Freeze Sequence

Figure 2. Harvest Sequence

Figure 3. Automatic Shut-Off

Harvest Sequence

5 The water pump continues to run, and the water

dump valve energizes for 45 seconds to purge

the water in the sump trough. The water fill valve

energizes (turns on) and de-energizes (turns off)

strictly by time. The water fill valve energizes for

the last 15 seconds of the 45-second water purge.

After the 45 second water purge, the water fill

valve, water pump and dump valve de-energize.

6 The harvest valve(s) 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 (Step 3 - 4).

When Used - The air compressor energizes after

35 seconds and remains energized throughout

the entire harvest cycle. The air compressor will

automatically energize for 60 seconds when the

harvest cycle time exceeded 75 seconds in the

previous cycle.

Automatic Shut-off

7 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 30

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.

1 2 3 4 5 6 7 8 9 10 11 12 ... 16 17

Comentarios a estos manuales

Sin comentarios

Manitowoc QF2300 Manual de usuario Pagina 7

Comentarios a estos manuales

Relacionado con productos y manuales para Máquinas productoras de hielo Manitowoc QF2300