Manitowoc SN12 Specifications download pdf (Page 15)

Section 3 Ice Machine Operation

Part Number 000005544 12/09 3-3

Sequence of Operation

15 MINUTE TIME DELAY

The 15 minute delay must be expired before the

gearmotor or compressor will energize.

The delay period starts to time out upon application of

power or movement of the toggle switch from OFF to

ICE.

The delay period starts when:

• Tthe ice machine enters Automatic Shutoff

• Power is disconnected and reconnected

• The toggle switch is moved from OFF to ICE

This time delay period can not be overridden and will

reset to 15 minutes if any of the above conditions occur.

PRIOR TO STARTUP

When the toggle switch is placed in the ICE position the

following must occur in the listed order before ice

making will start.

• The ice chute damper must be in the closed or down

position.

• The 15 minute delay period must be expired. The

delay period starts upon application of power or

toggle switch movement from OFF to ICE.

• The water sensing switch must be closed (water

reservoir full of water and water sensing float in the

up position).

INITIAL STARTUP

Applying power and/or moving the toggle switch from

OFF to ICE will start a 15 minute delay period. This

delay period can not be overridden. With the water

sensing switch closed (reservoir full of water) the gear

motor will energize at the end of the 15 minute time

delay. The compressor and condenser fan motor

energize 5 seconds after the gearmotor.

FREEZE CYCLE

The float valve automatically maintains the water level in

the reservoir. The ice damper will open and close to

verify ice production. The ice machine will continue to

make ice until the ice damper is held open (up) as ice

fills the bin.

AUTOMATIC SHUTOFF

When the ice damper is held open by ice, the gearmotor,

compressor and condenser fan de-energize. The fifteen

minute delay period starts to time out. The ice machine

will remain off until the 15 minute delay period expires

and the ice damper closes.

RESTART AFTER AUTOMATIC SHUT-OFF

1. Less than 4 hours have passed since automatic

shut-off.

With the water sensing switch closed (reservoir full of

water) the gear motor will energize at the end of the 15

minute time delay. The compressor and condenser fan

motor energize 5 seconds after the gearmotor.

2. More than 4 hours have passed since automatic

shut-off.

The dump valve energizes to drain the evaporator. After

30 seconds the dump valve de-energizes. When the

reservoir fills with water, the water sensing switch closes

and the gearmotor energizes. The compressor and

condenser fan motor energize 5 seconds after the

gearmotor.

SafeGuards

The ice machine control board has safety features to

protect the ice machine from severe failures. The ice

machine will stop when conditions arise that would

cause major component failure. Refer to section 5 for

details

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Manitowoc SN12 Specifications Page 15

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