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System Controller

Indicator Lights:

•

Bin Full: On when bin is full, goes on and
off as ice falls during a harvest cycle.

•

Freeze: On when the unit is in the Freeze
cycle, blinks when a freeze cycle is pending.

•

Harvest: On when the unit is in the Harvest
cycle.

•

Clean: On when the unit is in the Clean
cycle.

•

Off: On when the unit has been switched
off, blinks when the machine is preparing to
shut off.

•

Water: On when the controller has identified
a problem with the water system.

•

Refrigeration: On when the controller has
identified a problem with the refrigeration
system.

Cycle Definitions:

•

Freeze: The refrigeration system is operating
to remove heat from the evaporators. The
compressor, remote fan motor and water
pump are ON.

•

Harvest: The refrigeration and water
systems are operating to harvest the ice
cubes. While the compressor and fan motor
is on for the full cycle, the water pump will be
off at the beginning and the inlet water valve
will switch off before the end.

•

Clean: Water valve opens to fill the reservoir.
The Water pump starts. The Clean indicator
light is switched ON. A manually initiated
rinse cycle flushes the system.

1

2

3

4

5

6

7

8

9

BIN FULL

FREEZE

HARVEST

CLEAN

OFF

WATER

REFRIGERATION

RESERVOIR WATER

LEVEL SENSOR

ICE SENSOR

ICE SENSOR

RESERVOIR & DISCHARGE

LINE THERMISTORS

LOW VOLTAGE IN/OUT

WATER VALVE

HOT GAS VALVE

PURGE VALVE TIMER

CONTACTOR COIL

STACKING and/or

THERMOSTAT

FUTURE USE

FACTORY USE

PUSH BUTTON

CONTROL SWITCHES

HI VOLTAGE IN/OUT

WATER PUMP

INDICATOR LIGHTS:

DIAGNOSTIC LIGHTS:

CME2006R

July 1998

Page 17

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Summary of Contents for CME2006R

Page 1: ... Remote Condenser Location PAGE 11 Coupling Instructions PAGE 12 Electrical PAGE 13 Plumbing PAGE 14 After Utility Connections PAGE 15 Component Location and Function PAGE 16 System Controller PAGE 17 Initial Start Up PAGE 18 Startup Three Phase Compressor PAGE 19 Adjustments PAGE 20 How To Operate The System Controller PAGE 21 How The Electronic Cuber Works PAGE 22 How The Electronic Cuber Works ...

Page 2: ...tered in any way including the use of any parts and or other components not specifically approved by Scotsman Bins All models will fit a standard 48 wide or wider open top Scotsman Ice Storage Bin Some examples are BH900 BH1100 BH1300 BH1600 In addition there may be other bins that can be used check Scotsman s sales literature for application information Note Slope front bins must have an internal...

Page 3: ... LIE S BE FO RE SER VI CIN G RISK OF ELECTRIC SHOCK M WARNING ERC611 17 87 in 45 4 cm 88 DIA KNOCKOUT REMOTE CONDENSER FAN REMOTE CONDENSER LIQUID LINE 3 8 MALE CPLG REMOTE CONDENSER DISCHARGE LINE 1 2 MALE CPLG WATER INLET 3 8 FLARE ICE OPENING ICE OPENING PLAN VIEW BACK VIEW 6 00 in 15 2 cm MINIMUM FOR UTILITY CONNECTIONS 6 00 in 15 2 cm MINIMUM FOR AIR VENTILATION 4 20 in 10 7 cm 10 15 in 25 8 ...

Page 4: ...an what ends up in the bin as ice While most water is used during ice making a portion is designed to rinse out the water system to keep hard water scale from clogging up the machine That water rinse combined with water filters prolongs the times between needed water system cleaning Service Technicians All models covered here come set from the factory with at a Standard water rinse Standard water ...

Page 5: ...el the top edge of the bin front to back and left to right If the ice machine has not been unpacked do so now Remove the carton from the skid Remove shipping straps Remove the left side and front panels Remove all packaging materials including the compressor shpping brackets After all packing materials have been removed from the ice machine lift or hoist the machine onto the bin Align the sides an...

Page 6: ...hine with the two 3 pronged knobs supplied with the unit 6 Pull back into the ice machine any excess capillary tubing 7 Return the baffle to the bin and continue with the installation Note If the machine is located at an altitude higher than 2 000 ft adjust the thermostat by removing the plastic cover and rotating the adjustment screw per the table Bin Thermostat Bulb Route Bin Thermostat Bulb Int...

Page 7: ...at Bracket Attach Thermostat Bulb to Bracket Minimize Excess Tube in Bin Attach Bracket to Bottom of Ice Machine Bin Thermostat Capillary Tube Three Pronged Knob Thermostat and Bracket Mount Bulb Here CME2006R July 1998 Page 7 ...

Page 8: ...the front to back support bracket over the left edge of the freezing compartment 11 Remove two existing screws and secure the bracket to the freezing compartment back panel and front channel with the 2 existing screws and 1 large and 4 small screws from the kit Both Machines 12 Place the top ice machine onto the bottom one Secure together with hardware from the top machine Remove left front and le...

Page 9: ...Stacking Gasket for Metal Edges of Bottom Unit Gasket on Plastic Walls of Lower Unit Shield Hanger Bracket Shield Mounting Straps and Hardware Front To Back Bracket CME2006R May 2001 Page 9 ...

Page 10: ...ess valves goes to the ice maker Note The openings in the building ceiling or wall listed in the next step are the minimum sizes recommended for passing the refrigerant lines through 2 Have the roofing contractor cut a minimum hole for the refrigerant lines of 2 Check local codes a separate hole may be required for the electrical power supply to the condenser Caution Do NOT kink the refrigerant tu...

Page 11: ...o NOT meet these requirements must receive prior written authorization from Scotsman Do NOT Route a line set that rises then falls then rises Route a line set that falls then rises then falls Calculation Example 1 The condenser is to be located 5 feet below the ice machine and then 20 feet away horizontally 5 feet x 6 6 33 33 20 53 This location would be acceptable Calculation Example 2 The conden...

Page 12: ...s are properly engaged 4b Using two wrenches one to rotate the swivel nut and one to hold the tubing in place tighten each coupling It is CRITICAL that ONLY the NUT on the pre charged tube be turned or the diaphragms will be torn by the piercing knives and become loose in the refrigeration system causing severe operational problems Note As the coupling is tightened the diaphragms in the quick conn...

Page 13: ...e ice machine A separate knockout hole has been provided in the ice maker electrical junction box Electrical connections are made in the junction box in the back of the cabinet 1 Remove the junction box cover 2 Knock out both holes for a field supplied strain relief 3 Install wires and strain reliefs per code Note Condenser fan motor wires are tagged 4 Connect to wires and secure ground wire to gr...

Page 14: ...ater filters must flow at least 2 7 GPM or they will cause severe operational issues Check with the filter manufacturer When replacing a prior ice machine do NOT assume that the water flow capacity of the filter will be adequate All Drain Tubing Material must be RIGID Flexible tubing will eventually cause a restricted drain Drain All models have 1 gravity drain connection a 3 4 FPT fitting at the ...

Page 15: ...n properly made with the correct size tubing ___ 5 Have all the drain connections been properly made ___ 6 Has the unit been leveled Level the unit at the bin ___ 7 Have all unpacking materials been removed ___ 8 Is the water pressure adequate ___ 9 Is the machine secured to the ice storage bin ___ 10 Is the bin control system been properly installed ___ 11 Have the drain connections been checked ...

Page 16: ...Water Pump Forces the water from the reservoir to the top of the evaporator s The motor is kept separate from the water to minimize contact with moisture Hot Gas Valve Closed during freeze it opens during harvest to divert hot discharge refrigerant gas into the inlet of the evaporators Purge Valve Opens during the first part of harvest when the water pump restarts the water in the reservoir is div...

Page 17: ...ompressor remote fan motor and water pump are ON Harvest The refrigeration and water systems are operating to harvest the ice cubes While the compressor and fan motor is on for the full cycle the water pump will be off at the beginning and the inlet water valve will switch off before the end Clean Water valve opens to fill the reservoir The Water pump starts The Clean indicator light is switched O...

Page 18: ...l re fill the reservoir The second time it starts the Harvest Cycle Harvest Cycle The Harvest indicator light will be ON The hot gas valve will open The purge valve will be open for 74 seconds The pump is off it will restart in 74 seconds The purge valve closes The Inlet water valve will open for a short time The Bin Full indicator light will go on and off as ice falls from the evaporators Note Up...

Page 19: ...be refrigerating the water it s likely that it s running backwards To fix this two of the three compressor motor leads need to be reversed 1 Disconnect electrical power 2 Remove left front panel 3 Pull off compressor terminal cover 4 Locate terminals switch any two wires 5 Return compressor terminal cover to its original position 6 Reconnect electrical power 7 Push freeze button compressor will st...

Page 20: ... This switches the machine Off 2 Push and hold the OFF button for more than 3 seconds just until all Lights flash on then release it Do not hold it in it too long 3 Examine the green Lights They should have all flashed once then certain ones will have turned on to indicate which purge level the machine is set at There are 5 levels of purge available 1 Maximum Purge is when All 5 lights are ON Use ...

Page 21: ... Clean Button Pushing and releasing this button will cause the machine to empty the reservoir refill and leave only the water pump on for circulation of ice machine cleaner After the ice machine cleaner has circulated for about 10 minutes a second push of this button will switch on the rinsing system to flush out the dissolved scale and ice machine cleaner 4 Off Button Pushing and releasing this b...

Page 22: ...r inlets At the same time a Harvest Bypass Valve opens for a few seconds to add the refrigerant needed for harvest After that the Harvest Bypass Valve and the closed Discharge Check Valve keeps the refrigerant in the condenser out of the Hot Gas Circuit This warms up the evaporators and the surface of the ice frozen to the evaporator surface melts Ice then falls into the bin The Check Valves also ...

Page 23: ... machine by monitoring several input measures and switching various loads on and off Controller Inputs 1 Reservoir water temperature This is measured by a thermistor located in the water pump outlet 2 Discharge line temperature This is measured by a thermistor located on the compressor discharge line 3 Water level This is measured by an infrared sensor and float The float rises and falls with the ...

Page 24: ...the System Controller then measures how long it takes to lower the water level If the water level does not fall the machine Shuts Down on a Water Error 7 Once per freeze cycle the machine will shut off the water pump It only does this when the water temperature reaches a preset minimum The pump will only be off for a few seconds 8 As the machine makes ice the water level in the reservoir will ulti...

Page 25: ...f time to keep refrigerant out of the compressor oil Single Phase Power Interruptions If the power supply to a single phase unit is interrupted for less than a second a time delay relay will keep the compressor from restarting until 30 seconds have passed Because the controller should still be operating Continuous Run Time A unit that operates 24 hours a day 7 days a week is too small for the user...

Page 26: ... 9 After the ice machine cleaner has circulated for 10 minutes push and release the Clean button This starts the rinsing process The Clean indicator light will be ON Note The rinse process flushes any residual cleaner out of the ice machine s water system 10 Continue the rinsing process for 20 minutes then push the off button to switch the machine off 11 Go to the next step to sanitize the machine...

Page 27: ...oir cover lift cover out of machine 4 Locate drain plug at the back of the reservoir Note Top unit of a stack will drain thru the bottom machine 5 Pull the drain plug to release the water On units over an ice storage bin the water will drain into the bin 6 Reverse steps 2 5 to reassemble 7 Push and release Freeze button 8 Return the left front panel to its original position To Sanitize the Ice Sto...

Page 28: ...orators The Water Distribution Channels must be free from mineral build up If build up is evident scrub the channels with Scotsman Ice Machine Cleaner and a plastic bristle brush 9 Examine the water distributors Although they are made of a material that is resistant to mineral build up some may be present Soak or scrub the distributors in or with a solution of Scotsman Ice Machine Cleaner and warm...

Page 29: ...f screen Note Screen is not replaceable and may only be removed by taking off the covering bracket The bracket forms part of the inlet water system and must be water tight to the valve body removal is not recommended 9 Reverse to reassemble Water Level Sensor The water level sensor contains two photo electric eyes and each eye has an emitter and a receiver For proper operation the receiver must be...

Page 30: ...racket check that they are clear of mineral build up They may be wiped clean with ice machine cleaner to assist in removal of the build up Note Do NOT use abrasive materials or cleaner on the ice sensor lenses A soft toothbrush works well to get into the hard to reach spots 8 Reverse steps 1 6 to reassemble To Clean the Remote Air Cooled Condenser 1 Disconnect and lock out the electrical power 2 A...

Page 31: ...e is OK replace the water level sensor Unit is off on a Refrigeration Error Low discharge or long freeze cycle Check refrigeration Light If the Light is glowing there is a probable refrigeration problem Check fan motor harvest bypass valve and or controller Harvest problem Check refrigeration Light If the Light blinks once and repeats look for a harvest problem where some cubes were sensed Check r...

Page 32: ...es Check for a leak thru the purge valve Low ice capacity Dirty condenser Clean condenser Recirculation of air Block air re circulation or move condenser Low refrigerant charge Check system If there is a low charge find the leak recover the refrigerant repair the leak replace the dryer evacuate and weigh in the nameplate charge Too much water Check for inlet water valve leak thru Unit does not shu...

Page 33: ...both sides of valve during freeze Mechanical problem in valve Replace valve Water Inlet Valve does not open Open solenoid coil Replace valve Stuck valve Replace valve No power to valve best checked at the beginning of Freeze Check wire connections if ok replace System Controller Water Inlet Valve does not flow enough water Restriction in water supply Check water filters and or inlet screen Water I...

Page 34: ...air the fan motor Extreme hot location Relocate the cabinet Extremely hot condenser location Move condenser or provide shade Overcharge of refrigerant Recover evacuate and weigh in the nameplate charge Hot gas valve leaks thru unit off on refrigeration error At the end of the freeze cycle there should be a definite difference in temperature between the inlet and outlet of the Hot Gas Valve If not ...

Page 35: ...160 0 2 4 6 8 10 12 14 Beg 2 mins 3 mins 5 mins 1st fill 10 mins End Hvst End Hvst Three Phase Amp Draw Freeze Cycle Harvest Number of Evaporators 6 Refrigerant Charge 336 ounces of R 404A Compressor Type Three Phase Copeland Scroll ZS30K4E TF5 230 Single Phase Copeland Scroll ZS30K4E PFV 230 Typical Compressor Amps single phase freeze 19 6 harvest 22 5 three phase 11 to 9 freeze 11 harvest Typica...

Page 36: ...Pressure CME2006 Suction Pressures 0 20 40 60 80 100 Time PSIG 70 70 50 Freeze Harvest Freeze CME2006 Suction Pressures 0 20 40 60 80 100 120 Time PSIG Freeze Harvest Freeze 90 90 50 CME2006R July 1998 Page 36 ...

Page 37: ...g the replacement part 1 Touch a grounded surface 2 Remove left front panel 3 Disconnect electrical power 4 Remove high voltage box cover 5 Locate timer board at the back of the high voltage box 6 Unplug all the wires to the board 7 Compress each of the four stand off posts to release the board from the stand offs 8 Remove the board from the unit Reverse to reassemble Water Pump 1 Disconnect the e...

Page 38: ...er 4 Pull float ball from float stem it is a snap fit Pull stem out 5 Locate water level sensor mounting tabs compress together to release sensor from bracket 6 Remove harness from sensor 7 Reverse to replace 8 Replace front panel 9 Re connect electrical power Water Level Sensor 1 Remove front panel 2 Push and hold the OFF button Release it when the machine stops 3 Trace wire harness from water le...

Page 39: ...Electric Eyes Ice Sensors These must be replaced as a set 1 Remove both front panels 2 Push and release the Off button 3 Remove evaporator cover 4 Remove lower inner splash panel 5 Locate the back electric eye Pull out on the rectangular tab until the sensor is free of its installed position 6 Unplug the back sensor from its wire harness 7 Unplug the front sensor its wire harness 8 Locate retainer...

Page 40: ...ot start check the starting components first If the machine has low capacity check for proper charge TXV operation hot gas valve leak thru or inlet water valve leak thru The metal bracket in front of the compressor must be removed to access the compressor Note This machine uses a Copeland Glacier scroll compressor which has the following unique operating characteristics 1 Do NOT bypass the low pre...

Page 41: ...in the right side of the freezing compartment Then while the helper lifts the right most evaporator slightly push the bracket in from below Keep doing this and push up on the left end of the new bracket The freezing compartment walls may be pushed apart slightly to make this easier 9 Push up enough on the left end of the bracket until it snaps into the vertical channel in the left side of the free...

Page 42: ...geration wrench and check that the valve stem is fully UP or OUT If recovering remove the schrader core before opening the valve 2 Remove the port caps and attach refrigerant manifold hoses 3 Open the valves and purge the hoses Note Open liquid line valve half way to access both sides of the liquid line 4 When service is complete shut the liquid line access valve first fully up Then with the machi...

Page 43: ...e check the scale 6 If all of the refrigerant charge has not been weighed into the discharge side it must be carefully added thru the low side Close the discharge service access valve 7 With a sight glass or charge faster in the hose to the low side port start the ice machine 8 Open the low side service access valve 9 Crack open the low side manifold valve and watch the scale and sight glass Open ...

Page 44: ...Locate the System Controller If a red diagnostic light is glowing note which one and its blink rate Then push and release the off button 3 Push and release the Freeze button 4 The machine should begin to operate If there is a lack of water it will soon shut off again 5 Return the front panel to its normal position If the machine shuts down again call for service To Shut the Machine Off 1 Remove th...

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