Scotsman CU50 Service Manual Download

Page: 20 / 30

Controller

The controller is located at the front of the unit,
under the top panel.

It is powered by a 12 volt transformer. It has 5
indicator lights:

•

Compressor

- Light is ON if compressor is

powered

•

Water

- Light is ON if inlet water solenoid

valve is powered

•

Hot Gas

- Light is ON when Hot Gas Valve is

powered

•

Fan

- Light is ON when Fan motor is

powered

•

Power

- Light is ON when power is

connected to controller

Control Safeties

No Water

. If the Water Sensor cannot detect

water, and the inlet water solenoid valve has been
on for the maximum fill time, the controller will stop
all action and wait 20 minutes to re-try water fill.
During this time the Check Water light on the
control panel will be blinking,

Maximum Freeze Time

. If the freeze cycle should

extend to 60 minutes, the controller will
automatically put the machine into a Harvest cycle.

Maximum Harvest Time.

6 minutes

Time between restarts

. After the machine has

operated and then turned off, the controller will not
restart the machine for four minutes.

March 2010

Page 20

CU50
Service Manual

Comp

Water

Hot Gas

Fan

Power

Evaporator

Thermistor

Water Sensor

Bin
Thermostat

Control Panel
Ribbon

High

Voltage

Connector

Power Supply
Connector

Summary of Contents for CU50

Page 1: ...y Page 5 Door Covering Page 6 Door Panel Attachment Page 7 Custom Panel Page 8 Door swing change Page 9 Installation Water Drain Page 10 Gravity Drain Page 11 Electrical Page 12 Cube Size Adjustment Page 13 Harvest Time Adjustment Page 14 Control Settings Page 15 Use Page 16 How to clean the condenser and winterize Page 17 How to remove scale from the ice making system Page 18 System Information P...

Page 2: ... Power consumption 275 400 Watts Varies during Freeze and Harvest cycles Voltage limits Minimum 104 volts Maximum 126 volts Options Kickplate Extension In some situations the leg levelers will be extended enough to become visible A kit to extend the kickplate over the legs is KKPF Cabinet Stability In some free standing installations it may be prudent to add a bracket that secures the back of the ...

Page 3: ... FLOOR D R AIN A C CESS HOLE 34 38 873 25 3 85 97 79 29 66 753 24 22 29 566 17 23 89 606 68 1 60 40 51 3 20 81 28 3 27 82 99 2 44 62 04 1 57 39 75 7 44 188 98 3 83 97 16 115 V PO WER C ORD PO TABLE W A TER INLET 1 4 C OMPRESSION FI TTING D R AIN FLEXIBLE TUBING 3 8 I D PUMP MODEL INC LUDED 5 8 I D G R A VI TY MODEL N O T INC LUDED ...

Page 4: ...ey meet or exceed the standards of agencies like U L Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any parts and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and designs are subject ...

Page 5: ...al scale can shorten machine life To keep the machine operating properly these impurities or minerals will have to be regularly dissolved by an acid cleaning using Scotsman Ice Machine Scale Remover Directions for this may be found in the section under cleaning Filters and Treatment In general it is always a good idea to filter the water A water filter if it is of the proper type can remove taste ...

Page 6: ...cabinet bracket 5 Attach top hinge to lower cabinet bracket using original screws 6 Remove original bottom hinge 7 Remove two plugs or screws from upper cabinet bracket 8 Attach bottom hinge to upper cabinet bracket using the original screws 9 Place the door on bottom hinge tip up to slide under top hinge 10 Insert hinge pin into top hinge and door 11 Tighten hinge pin 12 Replace screws or plugs i...

Page 7: ... edges and the floor Built In Situations If a finished floor is to be installed in the area after the ice machine has been built in shims the expected thickness of the floor should be installed under the unit to keep the machine level with the planned floor level Installations on a slab Use a pump model and pump the water to the point of drainage Pump models will pump 1 story 10 feet high Installa...

Page 8: ...n fitting on the tubing and connect to the inlet of the solenoid Drains There are two types of ice machine models one that drains by gravity and one that has an internal drain pump Drain Pump Model drain installation 1 Locate the coil of 3 8 ID plastic drain tubing secured to the back of the unit 2 Route the plastic drain tube from the back of the unit to the drain connection point IMPORTANT NOTE ...

Page 9: ...barbed elbow and take off the plastic cover in the base pan below the drain hose 4 Connect a straight 5 8 barbed connector to the drain hose securing with the clamp removed in step 4 5 Cut an 8 piece of 5 8 ID X 7 8 OD tygon clear plastic tubing Slide one end of the tube onto the outlet of the barbed connector and secure with a clamp Leave the other end of the tube lying on the floor of the base p...

Page 10: ... the drain been tested for flow and leaks 5 Has the unit been connected to the proper electrical supply 6 Has the unit been leveled 7 Have all packing materials been removed from the machine 8 Has the door covering been installed Initial Start Up 1 Turn on the water supply 2 Switch on the electrical power 3 Push and release the On Off switch to start the machine The Ice Making light next to the On...

Page 11: ... light out 3 Push and release the On Off button 4 View the lights Compare to the table below Cube Size Change Table On Off Water Clean Default off off off Add 1 minute on off off Add 2 minutes off on off Add 3 minutes off off on Add 4 minutes on on on 1 minute flash off off 2 minutes off flash off 3 minutes off off flash 4 minutes flash flash flash 5 Select the amount of change 6 Push and release ...

Page 12: ...ights Compare to the table below Harvest Time Table On Off Water Clean Default off off off Add 10 seconds on off off Add 20 seconds off on off Add 30 seconds off off on Add 40 seconds on on on 10 seconds flash off off 20 seconds off flash off 30 seconds off off flash 40 seconds flash flash flash 4 Select the amount of change 5 Push and release the Clean button until the correct light pattern is di...

Page 13: ...then repeat step 1 All lights will flash once To return to Automatic purge selection 1 Press and hold the ON button for 5 seconds then release 2 Wait between 5 and 20 seconds then repeat step 1 All lights will flash twice Manual Harvest from the OFF or Standby Mode powered but no lights are on 1 Press and hold the Clean Reset button for 5 seconds and release 2 Wait between 5 and 20 seconds then re...

Page 14: ...is cleaned using the process on page 13 Noise The ice machine is designed for quiet operation but will make some noise during the ice making cycle During a freezing cycle it is normal to hear the fan moving air and the water pump circulating water Ice hitting the bin or ice in the bin can be heard during harvest Maintenance There are 5 things to keep clean 1 The outside cabinet door 2 The ice stor...

Page 15: ...ng system 2 Open the door and push and release the On Off switch to turn the machine off 3 Turn off the water supply 4 Drain the water reservoir by removing the rubber cap under the reservoir it s near the back wall of the ice storage bin 5 Disconnect the incoming water line at the inlet water valve 6 Open the door push and release the on off switch to turn the machine on 7 Blow air through the in...

Page 16: ...e On Off switch The machine will begin to flush out the cleaning solution 7 Operate the machine for another hour 8 Push and release the On Off switch The machine will stop the cleaning process 9 Pour a gallon of hot 95o F 115o F water into the bin to flush out the drain 10 Clean the bin liner of mineral scale by mixing some ice machine scale remover and hot water and using that solution to scrub t...

Page 17: ...o the inverted cup mold As the water is cooled and ice begins to form in the cups the temperature of the evaporator will fall The freeze cycle continues until the temperature of the thermistor attached to the evaporator outlet tube falls to about zero degrees F At that point the controller starts a freeze cycle timer whose default time is 10 minutes At the end of the freeze cycle s timed portion t...

Page 18: ... with an ice making cycle Instead it will blink the Water light and try filling the reservoir in 20 minutes Reservoir water dilution The process of making ice from circulating water causes the pure water to freeze first because it freezes at the warmest temperature The remaining water will develop an increasing concentration of minerals If that mineral concentration were allowed to continue eventu...

Page 19: ... Page 19 CU50 Service Manual Control Panel Bin Light and Curtain Evaporator Platen Scoop and Thermostat Bracket Evaporator and Controller Condenser and Bin Thermostat Inlet Water Solenoid Valve Model and Serial Tag Location ...

Page 20: ...enoid valve has been on for the maximum fill time the controller will stop all action and wait 20 minutes to re try water fill During this time the Check Water light on the control panel will be blinking Maximum Freeze Time If the freeze cycle should extend to 60 minutes the controller will automatically put the machine into a Harvest cycle Maximum Harvest Time 6 minutes Time between restarts Afte...

Page 21: ... 20 50 20 21 19 20 18 19 17 18 16 17 15 16 40 18 19 17 18 16 17 15 16 15 16 15 16 Harvest Cycle Seconds Air Temperature 100 90 80 70 60 50 Water Temperature 80 100 55 60 60 70 70 80 80 90 90 100 110 115 70 80 65 75 70 80 75 85 85 95 95 105 115 120 50 70 70 80 75 85 85 95 125 135 140 150 160 170 40 50 100 120 115 125 130 140 150 170 180 200 210 230 Total Cycle Minutes Air Temperature 100 90 80 70 6...

Page 22: ...Refrigeration System March 2010 Page 22 CU50 Service Manual Suction Pressure 10 0 10 20 30 40 50 60 70 Time PSIG Discharge Pressure 50 60 70 80 90 1 00 1 1 0 1 20 1 30 1 40 1 50 Time PSIG ...

Page 23: ...4463 113 4367 114 4273 115 4182 116 4093 117 4006 118 3921 119 3838 120 3757 121 3678 122 3601 123 3526 124 3452 125 3381 126 3311 127 3243 128 3176 129 3111 130 3047 131 2985 132 2924 133 2865 134 2807 135 2751 136 2696 137 2642 138 2589 139 2537 140 2487 141 2438 142 2390 143 2343 144 2297 145 2252 146 2208 147 2165 148 2123 149 2082 150 2042 151 2003 152 1965 153 1927 154 1890 155 1855 156 1819...

Page 24: ... Inlet water valve leaks through during freeze Check inlet water valve Low on refrigerant Check cube formation Connected to hot water Check for bleed thru from missing check valve in building water supply Cannot make ice Spray pump not pumping Check pump motor Fan motor not turning Check fan motor check fan blade check controller for voltage output Pump hose disconnected Check hose Very low on ref...

Page 25: ...r temperature very low Adjust harvest time Fan motor does not stop Check voltage replace controller Makes poor quality ice Problem Likely Cause Probable Solution Spray pattern poor Spray jets dirty Clean jets Runs out of water Water leaking from reservoir Correct leak High TDS water supply Groundwater supply Treat water Makes ice but melts rapidly Problem Likely Cause Probable Solution Restricted ...

Page 26: ...coil 6 Remove two screws holding valve to chassis 7 Squeeze hose clamp larger and push away from solenoid valve outlet 8 Pull hose from outlet of valve 9 Reverse to reassemble Curtain 1 Shut unit off 2 Loosen both thumbscrews holding curtain bracket to freezing chamber 3 Pull out and remove curtain with bracket from ice machine 4 Reverse to reassemble Spray Platform 1 Remove curtain 2 Lift spray p...

Page 27: ...crews holding transformer to controller box and pull transformer up and out of the ice machine 6 Reverse to reassemble Controller Note If unit is built in it must be pulled out to change the controller 1 Disconnect electrical power 2 Remove top panel 3 Remove controller box cover 4 Unplug all connections 5 Remove screws holding controller to housing and lift controller from unit Note To avoid dama...

Page 28: ... Remove controller box cover 11 Disconnect thermistor from controller pull wire back to suction line 12 Remove curtain hanger 13 Locate elbows where water flows onto the evaporator platen 14 Pull clip up Push inner elbow back and rotate it until it points straight up then push it back through the hole in the back of the freezing compartment 15 Pull water inlet elbow out of inner elbow March 2010 P...

Page 29: ...or at back of bin 22 Remove 1 screw at each corner of the base 23 Lift bin assembly off the base Note Prop evaporator assembly up A 3 length of 3 4 PVC tubing with one end inserted into the cup mold and the other against the base will hold it up The hot gas valve fan motor condenser and compressor are now exposed for service March 2010 Page 29 CU50 Service Manual Chassis Shown in Front of Bin Asse...

Page 30: ... on type valve with valves that are brazed onto the process tubes of the system Use a low flow of dry nitrogen when brazing on the system Install a new filter drier when replacing a refrigeration component or after a refrigerant leak repair Evacuate the system to at least 300 microns and use a micron gauge to measure the evacuation level Weigh in the nameplate charge The machine is critically char...

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