S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

More documents

Recommendations

Info

Electrical System Section 6 Ice Thickness Probe (Harvest Initiation) HOW THE PROBE WORKS Manitowoc’s electronic sensing circuit does not rely on refrigerant pressure, evaporator temperature, water levels or timers to produce consistent ice formation. As ice forms on the evaporator, water (not ice) contacts the ice thickness probe. After the water completes this circuit across the probe continuously for 6-10 seconds, a harvest cycle is initiated. SV3135 Ice Thickness Probe HARVEST LIGHT This light’s function is to be on as water contacts the ice thickness probe during the freeze cycle, and remain on throughout the entire harvest cycle. The light will flicker as water splashes on the probes. FREEZE TIME LOCK-IN FEATURE The ice machine control system incorporates a freeze time lock-in feature. This prevents the ice machine from short cycling in and out of harvest. The control board locks the ice machine in the freeze cycle for six minutes. If water contacts the ice thickness probe during these six minutes, the harvest light will come on (to indicate that water is in contact with the probe), but the ice machine will stay in the freeze cycle. After the six minutes are up, a harvest cycle is initiated. This is important to remember when performing diagnostic procedures on the ice thickness control circuitry. To allow the service technician to initiate a harvest cycle without delay, this feature is not used on the first cycle after moving the toggle switch OFF and back to ICE. MAXIMUM FREEZE TIME The control system includes a built-in safety which will automatically cycle the ice machine into harvest after 60 minutes in the freeze cycle. ICE THICKNESS CHECK The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (.32 cm). NOTE: Make sure the water curtain is in place when performing this check. It prevents water from splashing out of the water trough. 1. Inspect the bridge connecting the cubes. It should be about 1/8" (.32 cm) thick. 2. If adjustment is necessary, turn the ice thickness probe adjustment screw clockwise to increase bridge thickness, or counterclockwise to decrease bridge thickness. Set a 1/4” gap between the ice thickness probe and evaporator as a starting point. Then adjust to achieve a 1/8” bridge thickness. NOTE: The starting point before final adjustment is approximately a 3/16 inch gap. ADJUSTING SCREW 1/8” ICE BRIDGE THICKNESS Ice Thickness Check Make sure the ice thickness probe wire and the bracket do not restrict movement of the probe. Ice Thickness Probe Cleaning 1. Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of water) in a container. 2. Soak ice thickness probe in container of cleaner/ water solution while disassembling and cleaning water circuit components (soak ice thickness probe for 10 minutes or longer). 3. Clean all ice thickness probe surfaces including all plastic parts (do not use abrasives). Verify the ice thickness probe cavity is clean. Thoroughly rinse ice thickness probe (including cavity) with clean water, then dry completely. Incomplete rinsing and drying of the ice thickness probe can cause premature harvest. 4. Reinstall ice thickness probe, then sanitize all ice machine and bin/dispenser interior surfaces. 6-22 Part Number 80-1634-3 SV3132
Section 6 Electrical System DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY Ice Machine Does Not Cycle Into Harvest When Water Contacts The Ice Thickness Control Probe Step 1 Bypass the freeze time lock-in feature by moving the ICE/OFF/CLEAN switch to OFF and back to ICE. Step 2 Wait until the water starts to flow over the evaporator (freeze cycle). Step 3 Disconnect the ice thickness control from the control board, then connect a jumper wire from the control board to any cabinet ground and monitor the harvest light. Monitoring of Harvest Light Correction The harvest light comes on, and 10 seconds later, ice machine cycles from freeze to harvest. The ice thickness probe is causing the malfunction. The harvest light comes on but the ice machine stays in the The control circuitry is functioning properly. The ice machine is freeze sequence. in a six-minute freeze time lock-in (verify step 1 of this procedure was followed correctly). The harvest light does not come on. The control board is causing the malfunction. HARVEST LIGHT ICE THICKNESS PROBE CONNECTION Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe Step 1 Disconnect the ice thickness probe from the control board. Step 2 Wait until water starts to flow over the evaporator, then monitor the harvest light: Monitoring of Harvest Light Correction The harvest light stays off and the ice machine remains in the freeze sequence. The harvest light comes on, and 10 seconds later, the ice machine cycles from freeze to harvest. The ice thickness probe is causing the malfunction. Verify that the Ice Thickness probe is adjusted correctly. The control board is causing the malfunction. Part Number 80-1634-3 6-23
Page 1 and 2:
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 and 56: Section 6 Electrical System There a
Page 57 and 58: Section 6 Electrical System ICE/OFF
Page 59: Section 6 Electrical System General
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
show all

S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

Create successful ePaper yourself

Delete template?

Save as template?