S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

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Electrical System Section 6 Water Level Control Circuitry WATER LEVEL PROBE LIGHT The water level probe circuit can be monitored by watching the water level light. The water level light is on when water contacts the probe, and off when no water is in contact with the probe. The water level light functions any time power is applied to the ice machine, regardless of toggle switch position. During the freeze cycle, the water level probe is set to maintain the proper water level above the water pump housing. The water level is not adjustable. If the water level is incorrect, check the water level probe position. Reposition or replace the probe as necessary. WATER INLET VALVE SAFETY SHUT-OFF In the event of a water level probe failure, this feature limits the water inlet valve to a 6-minute on time. Regardless of the water level probe input, the control board automatically shuts off the water inlet valve if it remains on for 6 continuous minutes. FREEZE CYCLE CIRCUITRY <strong>Manitowoc</strong>’s electronic sensing circuit does not rely on float switches or timers to maintain consistent water level control. During the freeze cycle, the water inlet valve energizes (turns on) and de-energizes (turns off) in conjunction with the water level probe located in the water trough. During the first 45 seconds of the Freeze Cycle: • The water inlet valve is on when there is no water in contact with the water level probe. • The water inlet valve turns off after water contacts the water level probe for 3 continuous seconds. • The water inlet valve will cycle on and off as many times as needed to fill the water trough. After 45 seconds into the Freeze Cycle: The water inlet valve will cycle on, and then off one more time to refill the water trough. The water inlet valve is now off for the duration of the freeze sequence. HARVEST CYCLE CIRCUITRY The water level probe does not control the water inlet valve during the harvest cycle. During the harvest cycle water purge, the water inlet valve energizes and deenergizes strictly by time. The harvest water purge jumper may be set at 45 seconds (top and center terminals) or 0 seconds (center and bottom terminals). Set the harvest water purge to 0 seconds when reverse osmosis or deionized water is used. Use the factory setting of 45 seconds for all other types of water. HARVEST WATER PURGE ADJUSTMENT 45 SECOND JUMPER POSITION 0 SECOND JUMPER POSITION SV3139 SV3140 6-24 Part Number 80-1634-3
Section 6 Electrical System DIAGNOSING WATER LEVEL CONTROL CIRCUITRY Problem: Water Trough Overfilling During The Freeze Cycle Step 1 Start a new freeze sequence by moving the ICE/ OFF/CLEAN toggle switch to OFF, then back to ICE. (if water flows with the switch off, check the water inlet valve). Important This restart must be done prior to performing diagnostic procedures. This assures the ice machine is not in a freeze cycle water inlet valve safety shut off mode. You must complete the entire diagnostic procedure within 6 minutes of starting. Is water flowing into the water trough? GREEN WATER LEVEL LIGHT WATER LEVEL PROBE CONNECTION Step 3 Step 2 Wait until the freeze cycle starts (the freeze cycle starts when the water pump energizes). Step 3 Disconnect water level probe wire from control board and connect a jumper from the control board terminal and any cabinet ground, then refer to chart. Important For the test to work properly you must wait until the freeze cycle starts, prior to connecting the jumper wire. If you restart the test you must disconnect the jumper wire, restart the ice machine, (step 1) and then reinstall the jumper wire after the compressor starts. Step 3 Jumper wire connected from control board terminal to ground The Water Level Light is: The Water Inlet Valve Solenoid Coil is: Cause Part Number 80-1634-3 6-25 SV3135 NO ON De-Energized The water level probe is causing the problem. Clean or replace the water level probe. YES ON Energized The control board is causing the problem. YES OFF De-Energized The water fill valve is causing the problem.
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S1800 Marine Model Ice Machines Ser
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Section 1 General Information Secti
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Section 6 Electrical System Section
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Section 1 General Information Model
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Page 11 and 12: Section 2 Installation Instructions
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Page 35 and 36: Section 4 Maintenance Water Inlet V
Page 37 and 38: Section 5 Before Calling For Servic
Page 39 and 40: Section 6 Electrical System Energiz
Page 41 and 42: Section 6 Electrical System 2. REFR
Page 43 and 44: Section 6 Electrical System 4. FREE
Page 45 and 46: Section 6 Electrical System 6. HARV
Page 47 and 48: Section 6 Electrical System Wiring
Page 49 and 50: Section 6 Electrical System S1800 -
Page 51 and 52: Section 6 Electrical System Symptom
Page 53 and 54: Section 6 Electrical System PTCR DI
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Page 57 and 58: Section 6 Electrical System ICE/OFF
Page 59 and 60: Section 6 Electrical System General
Page 61: Section 6 Electrical System DIAGNOS
Page 65 and 66: Section 6 Electrical System Diagnos
Page 67 and 68: Section 7 Refrigeration System Sequ
Page 69 and 70: Section 7 Refrigeration System S180
Page 71 and 72: Section 7 Refrigeration System BEFO
Page 73 and 74: Section 7 Refrigeration System ICE
Page 75 and 76: Section 7 Refrigeration System SAFE
Page 77 and 78: Section 7 Refrigeration System Safe
Page 79 and 80: Section 7 Refrigeration System ANAL
Page 81 and 82: Section 7 Refrigeration System HARV
Page 83 and 84: Section 7 Refrigeration System HOW
Page 85 and 86: Section 7 Refrigeration System Pres
Page 87 and 88: Section 7 Refrigeration System Refr
Page 89 and 90: Section 7 Refrigeration System SYST
Page 91 and 92: Section 7 Refrigeration System 10.
Page 93 and 94: Section 7 Refrigeration System FILT
Page 95 and 96: Section 7 Refrigeration System REFR
Page 97 and 98: Section 7 Refrigeration System HFC
Page 100: Attend A Manitowoc Factory Service
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S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

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