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Questions and Answers
During the cycle, what happens if the ice sheet doesn't drop after 3.5 minutes?
During the cycle, what happens if the ice sheet doesn't drop after 3.5 minutes?
What is the primary tool for troubleshooting issues with the machine?
What is the primary tool for troubleshooting issues with the machine?
What should you check first if the machine is not getting water?
What should you check first if the machine is not getting water?
What should you check during the cycle if the machine is not harvesting?
What should you check during the cycle if the machine is not harvesting?
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What should you check if the machine has a long freeze with water in the trough?
What should you check if the machine has a long freeze with water in the trough?
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What is the purpose of the sequence of operation?
What is the purpose of the sequence of operation?
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Where can you find more information on troubleshooting and the sequence of operation?
Where can you find more information on troubleshooting and the sequence of operation?
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What is the primary purpose of the purge cycle in the sequence of operation?
What is the primary purpose of the purge cycle in the sequence of operation?
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What valves are energized during the start sequence?
What valves are energized during the start sequence?
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What valves are energized during the freeze cycle?
What valves are energized during the freeze cycle?
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What is the maximum duration of the freeze cycle?
What is the maximum duration of the freeze cycle?
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What valves are energized during the harvest cycle?
What valves are energized during the harvest cycle?
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Where can the sequence of operation be found?
Where can the sequence of operation be found?
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Study Notes
Introduction to Sequence of Operation
- The sequence of operation is a step-by-step process that a machine goes through to complete a task, in this case, making ice.
- Understanding the sequence of operation is crucial for troubleshooting.
- The sequence of operation can be found in the Technician's Handbook.
Purge Cycle
- The purge cycle is the first step in the sequence of operation.
- During the purge cycle, the water pump and dump valve are energized to remove any water left in the tray.
- This ensures that the machine starts with fresh water.
Equalization Mode
- After the purge cycle, the machine enters equalization mode for 5 seconds.
- During equalization mode, the harvest valve and air pump (if equipped) are energized to equalize pressures in the system.
- This makes it easier for the compressor to start up.
Start Sequence
- After equalization mode, the machine enters the start sequence.
- During the start sequence, the harvest valve is energized for 5 seconds, and the air pump (if equipped) and contactor coil for the compressor and fan are energized.
Pre-Chill Cycle
- After the start sequence, the machine enters the pre-chill cycle.
- The pre-chill cycle lasts for 2 minutes on the initial startup and 30 seconds on subsequent cycles.
- During the pre-chill cycle, the water fill valve is energized, and the water level probe is monitored.
Freeze Cycle
- After the pre-chill cycle, the machine enters the freeze cycle.
- During the freeze cycle, the water pump, water fill valve, and contactor coil for the compressor and fan are energized.
- The freeze cycle lasts for a maximum of 35 minutes.
Harvest Cycle
- After the freeze cycle, the machine enters the harvest cycle.
- During the harvest cycle, the harvest valve, air pump (if equipped), and contactor coil for the compressor and fan are energized.
- The harvest cycle lasts for a maximum of 7 minutes.
Water Assist Function
- If the ice sheet doesn't drop after 3.5 minutes, the machine enters the water assist function.
- During the water assist function, the water solenoid valve is energized, and water is circulated over the evaporator to help free the ice sheet.
Troubleshooting
- The sequence of operation can help troubleshoot issues with the machine.
- Checking the energized chart can help identify where in the sequence the machine is and what components should be energized.
- Inputs and outputs can also be checked to determine where the machine is in the sequence.
Scenario 1: Machine Not Getting Water
- Check the water level probe to see if it's sensing water.
- If the probe is not sensing water, check the water inlet valve and supply.
- If the probe is sensing water, check the water level probe itself.
Scenario 2: Machine Not Harvesting
- Check the harvest valve to see if it's open or closed.
- Check the inputs and outputs to determine where the machine is in the sequence.
- Check the energized chart to see if the harvest valve should be open.
Scenario 3: Long Freeze with Water in the Trough
- Check the water pump to see if it's working correctly.
- Check the inputs and outputs to determine where the machine is in the sequence.
- Check the energized chart to see if the water pump should be running.
Conclusion
- The sequence of operation is a crucial tool for troubleshooting issues with the machine.
- Understanding the sequence of operation can help identify where in the process the machine is and what components should be energized.
- The Technician's Handbook provides more information on troubleshooting and the sequence of operation.### Upcoming Topics
- October: Cleaning a heavily scaled ice machine
- November: Quiet Cube and Remote Headmaster operation, troubleshooting
- December: Indigo and Indigo Next event log navigation, troubleshooting techniques
Quiz and Swag Bundle Giveaway
- Take the quiz within 2 hours of the original webcast or recorded webcast views
- Employees of Manitowoc Ice are not eligible
- Only one quiz submission per person
- Winners will be notified by email address
- For every 25 quiz submissions, one winner will be drawn for the swag bundle
- Swag bundle includes: hat, tote bag, tape measure, and selfie light
- QR code and link provided to take the quiz on any platform
Introduction to Sequence of Operation
- The sequence of operation is a step-by-step process that a machine goes through to complete a task, in this case, making ice.
- Understanding the sequence of operation is crucial for troubleshooting.
Purge Cycle
- The purge cycle is the first step in the sequence of operation.
- During the purge cycle, the water pump and dump valve are energized to remove any water left in the tray.
- This ensures that the machine starts with fresh water.
Equalization Mode
- After the purge cycle, the machine enters equalization mode for 5 seconds.
- During equalization mode, the harvest valve and air pump (if equipped) are energized to equalize pressures in the system.
- This makes it easier for the compressor to start up.
Start Sequence
- After equalization mode, the machine enters the start sequence.
- During the start sequence, the harvest valve is energized for 5 seconds, and the air pump (if equipped) and contactor coil for the compressor and fan are energized.
Pre-Chill Cycle
- After the start sequence, the machine enters the pre-chill cycle.
- The pre-chill cycle lasts for 2 minutes on the initial startup and 30 seconds on subsequent cycles.
- During the pre-chill cycle, the water fill valve is energized, and the water level probe is monitored.
Freeze Cycle
- After the pre-chill cycle, the machine enters the freeze cycle.
- During the freeze cycle, the water pump, water fill valve, and contactor coil for the compressor and fan are energized.
- The freeze cycle lasts for a maximum of 35 minutes.
Harvest Cycle
- After the freeze cycle, the machine enters the harvest cycle.
- During the harvest cycle, the harvest valve, air pump (if equipped), and contactor coil for the compressor and fan are energized.
- The harvest cycle lasts for a maximum of 7 minutes.
Water Assist Function
- If the ice sheet doesn't drop after 3.5 minutes, the machine enters the water assist function.
- During the water assist function, the water solenoid valve is energized, and water is circulated over the evaporator to help free the ice sheet.
Troubleshooting
- The sequence of operation can help troubleshoot issues with the machine.
- Checking the energized chart can help identify where in the sequence the machine is and what components should be energized.
- Inputs and outputs can also be checked to determine where the machine is in the sequence.
Scenario 1: Machine Not Getting Water
- Check the water level probe to see if it's sensing water.
- If the probe is not sensing water, check the water inlet valve and supply.
- If the probe is sensing water, check the water level probe itself.
Scenario 2: Machine Not Harvesting
- Check the harvest valve to see if it's open or closed.
- Check the inputs and outputs to determine where the machine is in the sequence.
- Check the energized chart to see if the harvest valve should be open.
Scenario 3: Long Freeze with Water in the Trough
- Check the water pump to see if it's working correctly.
- Check the inputs and outputs to determine where the machine is in the sequence.
- Check the energized chart to see if the water pump should be running.
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Description
Learn about the step-by-step process of ice making, including the purge cycle and its importance in troubleshooting. Find the sequence of operation in the Technician's Handbook.
