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SERVICE DIAGNOSIS: Water

SYMPTOM

POSSIBLE CAUSE

PROBABLE FIX

No ice is made

Inlet water valve will not open or
is dirty

Clean inlet screen, check coil,
replace valve if required

No water being pumped over
evaporators.

Check pump motor, replace pump
if motor will not run.

No water in reservoir, check inlet
water valve, check reservoir for
leak.

Water inlet valve leaks thru at
high rate

Replace inlet water valve

Cubes are not uniform in shape

Water distributors are dirty

Clean water system

Long Freeze Cycle

Inlet water valve leaks through

Replace inlet water valve

See electrical/adjustment

Makes thick ice/freezes up

Water inlet valve restricted

Clean or replace valve

Low water pressure

Check water filter or supply

Cubes too large

Inlet water valve leaks through

Replace inlet water valve

See electrical/adjustment

Low Capacity

Incoming water very warm

Check water temperature to
building

Lack of water

See unit runs out of water

Unit runs out of water

Reservoir leaks

Repair leak

Inlet water valve restricted

Clean or replace valve

Short harvest cycle

Adjust timer

Water pressure too low

Check supply

CME650R

October 1994

Page 23

Содержание CME650R

Страница 1: ...THE ELECTRICIAN 7 FOR THE PLUMBER 10 FINAL CHECK LIST 11 COMPONENT LOCATION 12 COMPONENT DESCRIPTION 13 INITIAL START UP 15 FREEZING CYCLE OPERATION 17 HARVEST CYCLE HOT GAS BYPASS 18 CLEANING SANITIZING 19 SYSTEM SPECIFICATIONS 21 ADJUSTMENTS 22 SERVICE DIAGNOSIS Water 23 SERVICE DIAGNOSIS Electrical and or Adjustments 24 SERVICE DIAGNOSIS Refrigeration and or Mechanical 25 REMOVAL AND REPLACEMEN...

Страница 2: ...psi 80 psi Voltage 10 10 Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance They meet or exceed the standards of U L N S F and C S A 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 ...

Страница 3: ... the water is very important in obtaining pure ice and in maximizing product life The water to the ice machine should be filtered Water filters vary greatly in ability and function Install one that filters out suspended solids to a dimension of 5 microns or less The finer the filter the better but finer filters may plug up sooner than course ones It may be necessary to add a course filter ahead of...

Страница 4: ...tubing on it will fit into the hole in the base of the machine 3 Locate and uncoil a portion of the bin thermostat capillary tube Route the end of the capillary tube into and through the bin thermostat bracket tube It should be inserted the full length of the tube but not past the end Stacking This machine will stack onto any CM250 CME250 CM450 CM500 CME500 CM650 or CME650 with the same cabinet de...

Страница 5: ...ant lines consists of a 3 8 inch diameter liquid line and a 1 2 inch diameter discharge line Both ends of each line have quick connect couplings the end without access valves goes to the icemaker 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 t...

Страница 6: ...l Connections 3 Begin tightening the couplings together by hand then using two wrenches it is important that ONLY the nut on the precharged lines be turned the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be loose in the refrigeration system tighten the coupling until it bottoms out or a definite increase in resistance is felt 4...

Страница 7: ...esponsible for serious damage to the icemaker The remote condenser is designed to be powered from the ice machine There is a separate electrical junction box at the back of the ice maker for the remote condenser Wire the remote condenser to the ice maker in accordance with local and national electric codes All outdoor wiring must be in rain proof conduit The condenser fan motor will run whenever t...

Страница 8: ...nd wire to the Ground Screw 2 Route connecting wires from the first ice machine s fan junction box and connect to the relay kit terminal strip marked No 1 Ice Machine 3 Route connecting wires from the second ice machine s fan junction box and connect to the relay kit terminal strip marked No 2 Ice Machine 4 Attach wires at the KCMR230 terminal strip marked To Remote Fan and route them to the remot...

Страница 9: ... test with a volt meter compressors must be operating for this test 1 Switch on ice maker 1 then ice maker 2 2 Test with a volt meter between terminals 2 and 4 then between terminals 1 and 3 Compare the data to that in this table If there is full voltage where there should be No voltage Switch off ice maker 2 compressor switch also and then switch off ice maker 1 Reverse the connections at the KCM...

Страница 10: ...gives about the best overall performance DRAIN Connections All drains are gravity type and must have a minimum of 1 4 inch fall per foot on horizontal runs The drains to be installed to conform with the local plumbing code Install a vertical open vent on drain line high point to insure good draining The ideal drain receptacle is a trapped and vented floor drain Recommended bin drain is 5 8 inch O ...

Страница 11: ...nnections been made 8 Is the water supply line shut off valve installed and electrical wiring properly connected 9 Check all refrigerant lines and conduit lines to guard against vibration or rubbing and possible failure 10 Have the bin and cabinet been wiped clean 11 Has the Manufacturers Registration form been properly filled out Check for correct model and serial numbers from Serial nameplate th...

Страница 12: ...rators Water distributor Control box with cube size control adjustment ON OFF switch Compressor switch Inside the control box is the control system for the ice machine Timer Cube Size Control Master Switch Compressor Switch Bin Thermostat Water Distributors Drain Trough Bin Thermostat Bracket Water Inlet Valve Water Pump Bin Thermostat Control Box Component Location Overflow Standpipe CME650R Marc...

Страница 13: ...ssembly The function of the timer begins when activated by the cube size control The outer surface or large diameter lobe of the timer cam determines the timer cycle for finish freezing of the ice cubes while the inner surface or small diameter lobe determines the time cycle for the harvest cycle When the microswitch button is pushed in there is power connected to the coil of the relay and the uni...

Страница 14: ... evaporator where it enters the water distribution system Water Distribution System The water distribution system evenly supplies water to all cells of the evaporator plates The water pump pumps water from the sump up the vertical tygon tube to the tee From there water is channeled through the water manifold to the water distributors above each evaporator plate and from six holes within each distr...

Страница 15: ...art the timer The timer starts when the actuator arm on the microswitch drops off outer cam into cam slot See Front View of Timer 6 Move the Master ON OFF switch to the ON position 7 Allow the reservoir to fill If needed rotate the timer clockwise a to begin another harvest cycle to add more water to the reservoir Note Some water will drip off the evaporators this is normal and there will be a red...

Страница 16: ... making but longer harvest cycles Do NOT adjust harvest time too short as this will cause a freeze up of the evaporators To Adjust Harvest Time A Disconnect electrical power B Locate timer cam in the control box C Loosen set screw holding the two halves of the cam together and rotate the front half to increase or decrease the harvest portion of the cam low part D Re tighten the set screw E Reconne...

Страница 17: ...reezing cycle The timer will keep the icemaker operating in the freezing cycle for a selected length of time This will give the ice cubes time to fully form After that selected length of time the timer will switch the icemaker into the harvest cycle through the contacts of the timer assembly microswitch Low Temperature Freeze When the outside air temperature is low the Head Pressure Regulator will...

Страница 18: ...ce cubes drop into the ice storage bin below At the end of the harvest cycle the timer cam will push the actuator arm to the microswitch IN If the ice level control is still CLOSED a whole new cycle will begin If the ice level control is OPEN the icemaker will begin to shut OFF Pump Down Cycle When the ice level control is open at the end of the harvest cycle power is removed from the liquid line ...

Страница 19: ... ON 16 Replace the front panel 17 Discard the next batch of cubes to make sure all of the acid sanitizer is gone CAUTION DO NOT use ice cubes produced from the cleaning or sanitizing solutions Be sure none remain in the bin 18 Pour hot water into the storage bin to melt the cubes and also clean out the bin drain 19 Wash the bin liner with a solution of household bleach 1 ounce of bleach to 2 gallo...

Страница 20: ...s of Scotsman Ice Machine Cleaner to 4 pints of hot 950 F to 1100 F water 2 Remove all ice from the bin 3 Using rubber gloves dip a nylon scouring pad into the cleaning solution and scrub the scale off of the liner 4 After the scale has been removed rinse all of the surfaces inside the bin with clean potable water To sanitize the bin and ice machine Follow local codes for frequency of sanitizing U...

Страница 21: ...Preset at 2 66 minutes may be adjusted to suit local conditions Typical Suction Pressure in Harvest 90 95 PSIG 70o F air and 50o F water 100 110 PSIG 90o F air and 70o F water Typical Compressor Amp Draw 7 8 freeze 9 10 harvest High Pressure Cut Out Cuts out at 450 PSIG manual reset Pump Down Pressure Switch Closes at 35 PSIG Opens at 15 PSIG Compressor Copeland CS12K6E Bin Thermostat Adjustable C...

Страница 22: ...re a corresponding adjustment of the cube size control Rotating the shaft of the timer cam clockwise will allow putting the machine into either the freezing cycle or harvest cycle as required in the cleaning instructions To Adjust The Timer Switch Assembly The length of the harvest cycle can be changed by loosening the set screw on the cam and then rotating the shaft so that the opening between th...

Страница 23: ...Freeze Cycle Inlet water valve leaks through Replace inlet water valve See electrical adjustment See electrical adjustment Makes thick ice freezes up Water inlet valve restricted Clean or replace valve Low water pressure Check water filter or supply Cubes too large Inlet water valve leaks through Replace inlet water valve See electrical adjustment See electrical adjustment Low Capacity Incoming wa...

Страница 24: ...ater valve Timer stuck Replace timer Relay does not energize unit stuck in harvest Replace relay Long freeze cycle Water inlet valve leaks through Replace inlet water valve Water temperature too high Advise user Cubes too small Cube size set wrong Adjust cube size Cubes size control stuck closed Replace cube size control Cubes too large Water inlet valve leaks through Replace inlet water valve and...

Страница 25: ...plate charge Hot gas valve leaks thru At the end of the freeze cycle there should be frost on the evaporator end of the hot gas tubes if not replace the hot gas valve Liquid and discharge lines are in contact with each other Separate and insulate them Unit shuts off before bin is full Bin thermostat adjusted to open too soon Rotate knob on the thermostat clockwise to a colder setting Compressor cy...

Страница 26: ...nt for the left water distributor tube and notch also that the distributor manifold connections at the top center of each evaporator plate is snug against the top of the plate Cube Size Control To remove the cube size control 1 Remove front panel 2 Remove cover from control box 3 Trace capillary tube from the cube size control to the refrigerant suction line 4 Remove the coiled capillary tube bulb...

Страница 27: ...sen and remove outlet water line from the inlet water solenoid valve assembly 3 Remove screws and pull the water solenoid valve out to gain access 4 Pull electrical cord from solenoid coil terminals 5 Remove inlet water fitting from the water solenoid valve To replace the inlet water valve assembly reverse the removal procedures 6 Reverse to reassemble Electrical Shock Hazard Electrical shock can ...

Страница 28: ...ing this valve be certain that the valve is the cause of the problem 2 Remove the top service and front panels 3 Discharge and recover the refrigerant 4 Unplug the coil of the valve 5 With the refrigeration system open unsweat the valve from the tubing 6 Place the new valve in position 7 Wrap the new valve body with wet rags Do not get any moisture in the valve 8 Carefully braze the valve to the t...

Страница 29: ...ks Usually a leak detector capable of detecting a Halogenated refrigerant or HFC 134a will work Check with the leak detector manufacturer if in doubt As with any other refrigerant do NOT mix HP62 with pressurized air when leak testing Pressure Temperature Chart for HP62 VAPOR VAPOR TEMP PRESSURE TEMP PRESSURE DEG F PSIG DEG F PSIG 20 17 70 146 18 18 72 150 16 20 74 155 14 21 76 161 12 23 78 166 10...

Страница 30: ...refrigerant there is a leak and it must be found and repaired This system has a critical charge it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine or performance will suffer Anytime the refrigeration system has been opened the dryer should be replaced Note Only a HFC type dryer should be used When brazing the tubing connections to components s...

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