S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

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Electrical System Section 6 DIAGNOSING START COMPONENTS If the compressor attempts to start, or hums and trips the overload protector, check the start components before replacing the compressor. Capacitor Visual evidence of capacitor failure can include a bulged terminal end or a ruptured membrane. Do not assume a capacitor is good if no visual evidence is present. A good test is to install a known good substitute capacitor. Use a capacitor tester when checking a suspect capacitor. Clip the bleed resistor off the capacitor terminals before testing. Relay The relay has a set of contacts that connect and disconnect the start capacitor from the compressor start winding. The contacts on the relay are normally closed (start capacitor in series with the start winding). The relay senses the voltage generated by the start winding and opens the contacts as the compressor motor starts. The contacts remain open until the compressor is deenergized. Relay Operation Check 1. Disconnect wires from relay terminals. 2. Verify the contacts are closed. Measure the resistance between terminals 1 and 2. No continuity indicates open contacts. Replace the relay. 3. Check the relay coil. Measure the resistance between terminals 2 and 5. No resistance indicates an open coil. Replace the relay. HARVEST ASSIST AIR COMPRESSOR Function The air compressor breaks the vacuum between the sheet of ice and the evaporator which results in shorter harvest cycles. Specifications 115 Volt or 230 Volt - matches the ice machine voltage. Check Procedure 1. Verify when the air compressor should be running in the sequence of operation. 2. If the compressor is not running when it should be check voltage at the control board. 3. If there is no voltage present at the control board, replace the control board. 4. If there is voltage present at the control board check for voltage at the air compressor connector. 5. If there is no voltage present at the air compressor connector replace wire. 6. If there is voltage at the air compressor connector, use a volt ohm meter to verify there is no continuity through the motor windings then replace motor. 6-18 Part Number 80-1634-3
Section 6 Electrical System ICE/OFF/CLEAN TOGGLE SWITCH Function The switch is used to place the ice machine in ICE, OFF or CLEAN mode of operation. Specifications Single-pole, single-throw switch. The switch is connected into a varying low D.C. voltage circuit. Check Procedure NOTE: Because of a wide variation in D.C. voltage, it is not recommended that a volt meter be used to check toggle switch operation. 1. Inspect the toggle switch for correct wiring. 2. Isolate the toggle switch by disconnecting the Molex connector. 3. Check continuity across the toggle switch terminals. Note where the wire numbers are connected to the switch terminals, or refer to the wiring diagram to take proper readings. Switch Setting Terminals Ohm Reading 1-6 Open ICE 1-2 Closed 2-6 Open 1-6 Closed CLEAN 1-2 Open 2-6 Open 1-6 Open OFF 1-2 Open 2-6 Open 4. Replace the toggle switch if ohm readings do not match all three switch settings. Part Number 80-1634-3 6-19
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S1800 Marine Model Ice Machines Ser
Page 3 and 4:
Section 1 General Information Secti
Page 5 and 6: Section 6 Electrical System Section
Page 7 and 8: Section 1 General Information Model
Page 9 and 10: Section 1 General Information Model
Page 11 and 12: Section 2 Installation Instructions
Page 19 and 20: Section 3 Ice Machine Operation Com
Page 21 and 22: Section 3 Ice Machine Operation HAR
Page 23 and 24: Section 3 Ice Machine Operation HAR
Page 25 and 26: Section 4 Maintenance General You a
Page 27 and 28: Section 4 Maintenance Interior Clea
Page 29 and 30: Section 4 Maintenance REMOVAL OF PA
Page 31 and 32: Section 4 Maintenance 3. Water Dist
Page 33 and 34: Section 4 Maintenance Water Dump Va
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
Page 55: Section 6 Electrical System There a
Page 59 and 60: Section 6 Electrical System General
Page 61 and 62: Section 6 Electrical System DIAGNOS
Page 63 and 64: 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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