Manitowoc Ice Q130 manual Safety Limits, Safety Limit Stand-By Mode, Safety Limit Notes

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Section 5

Before Calling for Service

 

 

SAFETY LIMITS

General

In addition to standard safety controls, the control board has two built in safety limit controls which protect the ice machine from major component failures.

Safety Limit #1: If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle. If three consecutive 60-minute freeze cycles occur, the ice machine stops.

Safety Limit #2: If the harvest time reaches 3.5 minutes, the control board automatically returns the ice machine to the freeze cycle. If three consecutive 3.5 minute harvest cycles occur, the ice machine stops.

Safety Limit Stand-By Mode:

The first time a safety limit shut down occurs, the ice machine turns off for 60 minutes (Stand-by Mode). The ice machine will then automatically restart to see if the problem reoccurs. During the Stand-By Mode the harvest light will be flashing continuously and a safety limit indication can be viewed. If the same safety limit is reached a second time (the problem has reoccurred) the ice machine will initiate a safety limit shut down and remain off until it is manually restarted. During a safety limit shut down the harvest light will be flashing continuously.

Determining Which Safety Limit

Stopped The Ice Machine

When a safety limit condition causes the ice machine to stop, the harvest light on the control board continually flashes on and off. Use the following procedures to determine which safety limit has stopped the ice machine.

1.Move the toggle switch to OFF.

2.Move the toggle switch back to ON.

3.Watch the harvest light. It will flash one or two times, corresponding to safety limits 1 and 2, to indicate which safety limit stopped the ice machine.

After safety limit indication, the ice machine will restart and run until a safety limit is exceeded again.

Safety Limit Notes

A safety limit indication is completed before the water pump starts. Water contacting the ice thickness probe in the freeze cycle will cause the harvest light to flash. Do not mistake a harvest light flashing in the freeze cycle with a safety limit indication.

A continuous run of 100 harvests automatically erases the safety limit code.

The control board will store and indicate only one safety limit – the last one exceeded.

If the toggle switch is moved to the OFF position and then back to the ON position prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated.

If the harvest light did not flash prior to the ice machine restarting, then the ice machine did not stop because it exceeded a safety limit.

Part Number 000001130 12/08

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Contents Q130/Q210/Q270 UnderCounter Model Ice Machines Personal Injury Potential Safety NoticesProcedural Notices Read These Before ProceedingTable of Contents Section Before Calling for Service Table of Contents Section OperationSection Maintenance Model Numbers AccessoriesSection General Information Ice Machine Model Number Serial Number General Information Section Model/Serial Number LocationQ270 Models Model/Serial Number LocationGeneral Commercial Warranty Coverage GeneralAuthorized Warranty Service Service CallsGeneral Information Section Q130/Q210 ICE Machines Section Installation InstructionsIce Machine Dimensions GeneralSeries Heat of Rejection Ice Machine Air Conditioning Peak Installation Instructions Section Location of Ice MachineIce Machine Heat of Rejection Checking Ice Machine Level Section Installation Instructions Leveling the Ice MachineInstallation Instructions Section Electrical Service Drain Connections Section Installation Instructions Water Service/DrainsWater Supply Water Inlet LinesTypical Water Supply Drain Installation Personal Injury Potential Installation Instructions Section Installation Checklist Component Identification OperationInitial START-UP or START-UP After Automatic SHUT-OFF Operation Section Ice Making Sequence of OperationSection Operation Energized Parts Chart Water Float Valve Check Operation Section Operational ChecksSiphon System Siphon System CheckIce Thickness Check Section OperationWater Level Check ICE Bridge Thickness CheckOperation Section Cleaning and Sanitizing Procedure Section MaintenanceInterior Cleaning and Sanitizing Maintenance Section Float Valve Removal Q130 ModelsQ130 Water Distribution Tube Removal Q210/Q270 InstallationRemove the Water Trough Remove the ice damper Q130Remove the Bin Door Solution Type Water Mixed withSolution Type Water Mixed With Sanitizer Model Amount of Sanitizer Exterior CleaningICE Machine Inspection Water-Cooled Condenser Water Regulating Valve Cleaning the CondenserAir-Cooled Condenser Pry Open the Water Regulating Valve Maintenance Section Removal From Service WinterizationSELF-CONTAINED AIR-COOLED ICE Machines WATER-COOLED ICE MachinesThis page Intentionally Left Blank Maintenance Section Problem Possible Cause To Correct Section Before Calling for ServiceChecklist Safety Limit Feature Before Calling for Service SectionSafety Limit Notes Safety LimitsSafety Limit Stand-By Mode Determining Which Safety Limit Stopped The Ice MachinePossible Cause Check/Correct Safety Limit #1Safety Limit #2 This page Intentionally Left Blank