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SCCG50 & SCCP50
Service Manual
Introduction:
This ice machine is the result of Scotsman’s decades of experience as an industry leader in the design and manufacture of both commercial and residential ice machines.
This manual includes the information needed to install, start up and maintain the ice machine. Note any Caution or Warning indicators, as they provide notice of potential hazards. Keep this manual for future reference.
Table of Contents
Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Repair - Cabinet Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30
June 2008
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SCCG50 & SCCP50
Service Manual
Specifications
This ice machine is designed to be used indoors, in a controlled environment. It can be used in a wide variety of environmental conditions, but there are limits. Use outside of the listed limitations is misuse and will void the warranty.
Options:
Door Panel kits: Finished door panels are available from Scotsman for attachment to the machine, or a custom panel can be made.
Air temperature limits:
The ice machine will operate adequately within the limits, but functions best in temperatures between
70 and 80 degrees F.
•
Minimum – 50 degrees F. (10 o
C)
•
Maximum – 100 degrees F. (38 o
C)
Kit Number Panel Finish
KDFW White
KDFWS White
KDFB
KDFBS
KDFS
Black
Black
Handle Finish
White
Stainless Steel
Black
Stainless Steel
Stainless Steel Stainless Steel
Water temperature limits:
•
Minimum – 40 degrees F. (4.5
o
C)
•
Maximum – 100 degrees F. (38 o
C)
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.
Water pressure limits:
•
Minimum – 20 psi (1.4 bar)
•
Maximum – 80 psi (5.5 bar)
Cabinet Stability: In some free standing installations it may be prudent to add a bracket that secures the back of the cabinet to a wall. That kit number is KATB.
Drain Conversion:
Because the ice machine is making a food product, the water supply to the ice machine must be potable, or fit for human consumption.
Electrical
A gravity drain model can be converted to a drain pump model by installing a drain pump kit. The drain pump kit consists of a drain pump, wiring harness and associated tubing. The kit number is
A39462-021.
•
115 volt, 60 Hz. Plug into dedicated 15 amp circuit.
•
Power consumption: 275 - 400 Watts. Varies during Freeze and Harvest cycles.
Warranty Information
Voltage limits:
•
Minimum - 104 volts
•
Maximum – 126 volts
Warranty information is supplied separately from this manual. Refer to it for coverage. In general, the warranty covers defects in materials or workmanship and does not cover corrections of installation errors or maintenance.
Models: There are six models, all air cooled:
•
SCCP50M-1WU – Pump model, white cabinet
•
SCCG50M-1WU – Gravity drain model, white cabinet
•
SCCP50M-1BU – Pump model, black cabinet
•
SCCG50M-1BU – Gravity drain model, black cabinet
•
SCCP50M-1SU – Pump model, stainless cabinet
•
SCCG50M-1SU – Gravity drain model, stainless cabinet
July 2008
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SCCG50 & SCCP50
Service Manual
Cabinet Layout
20 3/8"
3 7/8"
FLOOR DRAIN
ACCESS HOLE
14 7/8"
22"
.75 SHEET METAL DOOR FRONT
.63 MIN. CABINET DOOR
29 1/4"
AIR OUT AIR IN
4"
2 3/4"
33 3/8" MIN.
34 3/8" MAX.
1" LEG ADJUSTMENT
(4) PLACES
115 V
POWER CORD
DRAIN
FLEXIBLE TUBING
3/8 I.D. PUMP MODEL (INCLUDED)
5/8 I.D. GRAVITY MODEL (NOT INCLUDED)
POTABLE WATER INLET
1/4" COMPRESSION FITTING
3 3/4"
7 3/8"
1 1/2"
2 1/2"
3 1/4"
June 2008
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SCCG50 & SCCP50
Service Manual
Air flow
The machine takes in room temperature air at the lower right front and forces warm air out the lower left front. Restricting the airflow will adversely affect the ability of the ice machine to make ice.
Control Panel
Ice Making
Area
Warm Air Out
Air Intake
Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They 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 to change without notice.
June 2008
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SCCG50 & SCCP50
Service Manual
Water Quality
All water, including potable water supplied by municipalities, contains some impurities or minerals. Water absorbs impurities from the air as rain and/or as it flows through the ground. Some of the impurities are solid particles, these are known as suspended solids, and a fine particle filter will remove them. Other impurities are chemically bonded to the water molecules, and cannot be filtered out, these are called dissolved solids.
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 and odors as well as particles. Some methods of water treatment for dissolved solids include reverse osmosis, and polyphosphate feeders.
RO Water
Ice made by this machine will have a lower mineral content than the water it was made from. This is due to the method of making ice. Purer water will freeze first in the ice making molds. The reason for this is that anything dissolved in water lowers the water’s freezing temperature. This concentrates most of the impurities in the ice machine water reservoir where they may form hard deposits known as scale. The machine dilutes the concentration of minerals by over-filling the reservoir during the harvest cycle (with the excess water flowing down the drain). s. Between 2 and 4 pints of water flow into the unit each cycle.
Between 1 and 3.5 pints of that rinses the reservoir and goes down the drain.
This machine can be supplied with Reverse
Osmosis water, but the water conductivity must be no less than 10 microSiemens/cm.
A reverse osmosis system should include post treatment to satisfy the R.O. water’s potential aggressiveness.
Deionized water is not recommended.
Because water softeners exchange one mineral for another, softened water may not improve water conditions when used with ice machines. Where water is very hard, softened water could result in white, mushy cubes that stick together.
Some impurities will inevitably remain, and will stick to the parts in the machine, and will cause malformed ice cubes. Eventually, built up mineral scale can shorten machine life.
If in doubt about the water, contact a local point of use water specialist for recommendations on water treatment.
Installation Overview
The ice machine must:
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.
•
•
•
• be connected to cold, potable water be connected to a drain be connected to the proper power supply be able circulate air through the vents at the front.
Note: Do not build in so that the door is recessed.
June 2008
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SCCG50 & SCCP50
Service Manual
Door Covering
Door Panel Custom Panel
The ice machine is supplied without a conventional door covering so it can be decorated to the user’s preference. Scotsman offers several coverings including white, black and stainless steel. In addition, a custom built panel can be placed onto the door.
A custom panel of wood or other material not exceeding 15 lb can be attached to the door.
Attachment is from the ice side of the door. Holes are provided in the door for this purpose.
See instructions in information packet to create and attach a custom panel:
Door Panel Attachment
To attach a Scotsman supplied panel:
Note: If door swing is to be changed, it must be done before panel is attached.
The panel will be held on by 6 sheet metal screws and 2 machine screws.
1.
Remove the gasket and retain for later use.
2.
If the door panel is stainless steel, remove any plastic covering the stainless steel panel.
3.
Place the panel onto the outside of the door, and secure it to the door using two machine screws, located at the left center and right center.
4.
Fasten the panel to the door using the 6 sheet metal screws. In the hinge area, use the outermost screw holes.
5.
Place the covers over the hinge areas, and secure each cover to the door using a sheet metal screw.
6.
Insert hole plug over screw installed in step 5.
7.
Return the gasket to its original position.
June 2008
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SCCG50 & SCCP50
Service Manual
Door Panel Attachment
Use Upper
Hole at the
Top
Gasket
Machine
Screw
Hole Plug
Cover
June 2008
Page 7
Use Lower
Hole at the
Bottom
Scotsman
Door Panel
SCCG50 & SCCP50
Service Manual
Custom Panel
A custom panel of wood or other material not exceeding 15 lb can be attached to the door.
Attachment is from the ice side of the door. Holes are provided in the door for this purpose.
To create and attach a custom panel:
•
Panel width: 14 7/8”
•
Panel height: Between 29 3/8” and 30 3/8”.
•
Panel thickness: 5/8” to ¾”
1. Measure overall height of cabinet opening where ice machine will be
(floor to bottom of countertop edge).
2. Determine desired kickplate space (from bottom of door to floor).
This could be equal to the adjacent cabinet’s kickplate space or another space the user wants.
3. Subtract kickplate space from cabinet opening.
13/16"
13/32"
4. Subtract 1/8 or more for clearance space between top of door and bottom of countertop edge from cabinet opening. This is the maximum door length.
14 11/16"
Ø 1/8"
TYP. (10)
5. Cut panel to width.
6. Cut panel to length (cabinet space
- kickplate space - top clearance = length).
7. Determine top of panel.
8. Mark hole locations using drawing on the back of these instructions.
Drawing assumes top of panel will be flush with top of door. Measure hole locations from the top of the panel.
13 31/64"
9. Drill pilot holes for wood screws.
Use drill stop to prevent drilling through the panel.
13/32"
10. Mount panel to door using wood screws or supplied panel mounting screws.
Note: When installed Ice machine must be adjusted for height to position top of door to desired clearance.
6 25/32"
4 1/8"
{Centerline}
14 7/8"
13 9/16"
8 1/4"
30 3/8"
29 3/8"
June 2008
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SCCG50 & SCCP50
Service Manual
Door swing change
The door can be attached to open with hinges on the left or right using new brackets shipped loose in the ice bin. Retain all screws for re-use.
8.
Remove the upper hinge and move it to the door's opposite side, bottom location. Secure using the original screws.
To change:
1.
Remove innermost screw holding each hinge to cabinet, loosen the other.
9.
Remove the original lower hinge and move it to the door's opposite side, upper location.
Secure using the original screws.
10. Install a screw removed in step 2 in outermost hole of upper and lower cross braces.
2.
Slide hinges to the side and remove door from cabinet. Remove screws loosened in step
1 from both hinge brackets.
3.
Remove two screws securing top panel to back, pull top panel back and remove from cabinet.
Door Hinge
Bracket
4.
Remove two screws at the top and lift the door hinge bracket out of the cabinet. Replace with the one supplied loose with the machine. Fasten it to the cabinet using the original screws.
5.
Return the top panel to the cabinet and fasten it with the original screws.
6.
Remove kickplate and front service panel.
7.
Remove two front screws and two bottom screws holding the bottom cross brace to the cabinet. Replace the brace with the one supplied loose with the machine. Secure it using the original screws.
11. Attach the door to the cabinet using the original screws.
12. Return kickplate and front service panel to their original positions and attach to the cabinet using the original screws.
Installation Notes
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.
Installations over a crawl space or basement:
Either gravity drain or pump model units may be used, if there is not enough room behind the machine for a drain/waste receptacle, the drain will have to be below the floor.
Note: When installed in a corner, the door swing may be limited due to handle contact with the wall or cabinet face.
Screw Below
June 2008
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SCCG50 & SCCP50
Service Manual
Installation: Water & Drain
The recommended water supply tubing is ¼ inch
OD copper. Stainless steel flex or reinforced PVC tube may also be used. Install an easily accessible shut-off valve between the supply and the unit. This shut-off valve should not be installed behind the unit.
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
Note: Do not use self-piercing type valves.
1. Locate the coil of 3/8” ID plastic drain tubing secured to the back of the unit.
1.
Remove the front service panel.
2. Route the plastic drain tube from the back of the unit to the drain connection point.
IMPORTANT NOTE: Often an air gap is required by local codes between the ice maker drain tube and the drain receptacle.
Screw
Securing
Front Service
Panel
2.
Route the tubing through the right hole in the back to the inlet water solenoid valve inlet.
3.
Install a compression fitting on the tubing and connect to the inlet of the solenoid.
Water Inlet
Tube (field supplied)
Drain Tube,
Route to building drain
Back View, Drain Pump Model
June 2008
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SCCG50 & SCCP50
Service Manual
Gravity Drain
Caution: Restrictions in the drain system to the machine will cause water to back up into the ice storage bin and melt the ice. Gravity drain tubing must be vented, have no kinks and slope to the building drain. Air gaps are typically required by local code.
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 pan until the unit is positioned over the floor drain.
1. Place the ice machine in front of the installation opening. Adjust leveling legs to the approximate height.
2. Remove the front service access panel and the upper back panel.
Note: If you are connecting a gravity drain model and the drain opening has been located in the floor under the base pan according to the pre install specifications, follow steps 3 through 5 to drain the unit through the base. If not, proceed to step 6b.
6. Route the drain tube. Either a) Insert the drain tube through the base pan into the floor drain or b)
Route the drain tube through the left hole in the lower back panel and connect to barbed elbow and secure with a clamp.
7. Reinstall the upper back panel.
3. Remove the clamp and barbed elbow and take off the plastic cover in the base pan below the drain hose.
8. Reinstall the service access panel. Level the unit.
Drain Hose
Barbed Elbow
Water Inlet
Tube (field supplied)
Drain Hose,
Route to building drain
Back View, Gravity Drain Model
June 2008
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SCCG50 & SCCP50
Service Manual
Electrical
The ice machine is supplied with a power cord. Do not remove the grounding pin from the cord’s plug.
Do not use extension cords. Follow all codes.
Connect the machine to its own 115 volt, 15 amp circuit.
Installation check list:
1.
Has the unit been connected to the proper water supply?
2.
Has the water supply be checked for leaks?
1.
If the electrical outlet for the ice maker is behind the unit, plug in the unit.
3.
Has the unit been connected to a drain?
4.
Has the drain been tested for flow and leaks?
2.
Position the unit in the installation opening.
3.
Turn on the water supply. Make sure that the ice maker is plugged in and the power is on.
5.
Has the unit been connected to the proper electrical supply?
6.
Has the unit been leveled?
4.
Slide unit into installation opening, paying careful attention to water supply and drain connections. Do not kink!
7.
Have all packing materials been removed from the machine?
5.
Pour a couple of quarts of water into the ice storage bin; on drain pump equipped machines the drain pump should start and water should pump out. Check for leaks.
8.
Has the door covering been installed?
Initial Start Up
1.
Turn on the water supply.
6.
Replace the service access panel.
2.
Switch on the electrical power.
7.
Level the unit as needed.
3.
Push and release the On/Off switch to start the machine. The Ice Making light next to the
On/Off switch will glow Green.
4.
Water will begin to flow into the unit. When the reservoir is full, water will start to drain from the machine. After a few minutes the compressor, water pump and fan motor will begin to operate and the first ice making cycle will have begun.
No adjustments are needed.
After about a half hour, ice will fall into the ice storage bin. The machine makes 24 cubes per batch. It is normal for the first batches of ice to melt, that continues until the bin has cooled. It will take 8 to 10 hours of continuous run time to fill the ice bin. When the bin is full of ice, the ice machine will shut off. It will automatically restart when the ice level falls, either from use or normal meltage.
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SCCG50 & SCCP50
Service Manual
Cube Size Adjustment
The cube size can be adjusted by changing the amount of freeze cycle time. This is done by a button press sequence.
Note: There is only one correct cube size. See the illustrations.
To adjust cube size:
1. Shut the machine off: If it's off on bin full press and release the On/Off button once, switching the
Ice Making light off. If the machine is making ice hold the On/Off button in until the Ice Making light is off.
2. Press and hold the Clean button for 5 seconds
(light on), then release (light out)
3. View the lights. Compare to the table below.
Cube Size Change Table
On/Off
Default off
Add 1 minute on
Add 2 minutes off
Add 3 minutes off
Add 4 minutes on
- 1 minute
- 2 minutes flash off
- 3 minutes
- 4 minutes off flash
Water off off on off on off flash off flash
Clean off off off on on off off flash flash
4. Select the amount of change.
5. Push and release the On/Off button until the correct light pattern is displayed.
6. Push and release the Clean button to select that setting.
7. Push and release On/Off to return to ice making.
Side Views of Cubes
Too Small, Adjust Cycle Longer
Just Right
Too Large, Adjust Cycle Shorter
June 2008
Page 13
Harvest Time Adjustment
The harvest time can be adjusted so that all the ice harvests during the cycle, plus a few seconds extra. This is done by a button press sequence.
Note: Do not set harvest time shorter than the actual time it takes to release all the cubes.
To adjust Harvest Time:
1. Shut the machine off by holding the On/Off button in until it shuts off (Ice Making light off).
2. Press and hold the On button again for 5 seconds, then release (Ice Making light will switch off).
3. View the lights. Compare to the table below.
Harvest Time Table
Default
- 40 seconds
On/Off Water off off
Add 10 seconds on
Add 20 seconds off
Add 30 seconds off
Add 40 seconds on
- 10 seconds
- 20 seconds
- 30 seconds flash off off flash flash off on off on off flash off
Clean off off off on on off off flash flash
4. Select the amount of change.
5. Push and release the Clean button until the correct light pattern is displayed.
6. Push and release the On button to select that setting.
7. Push and release On/Off to return to ice making.
June 2008
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SCCG50 & SCCP50
Service Manual
SCCG50 & SCCP50
Service Manual
Control Settings
Automatic water purge enable / disable
The control is set at the factory to automatically select the proper amount of water purge. If desired, that can be disabled, and a typical purge amount used.
To disable Automatic purge selection:
1. Press and hold the On/Off button until the unit shuts off. No lights should be on.
2. Press and hold the ON button for 5 seconds, then release.
3. Wait between 5 and 20 seconds, 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 repeat step 1. All lights will flash once. The On/Off light will be on until harvest has timed out.
Reset time to clean indicator light
Press and hold the Clean-Reset button for 3 seconds.
June 2008
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SCCG50 & SCCP50
Service Manual
Use
No special instructions are needed for use. Just take as much ice as you need, the machine will replace it. A scoop is provided, and it can be stored in the machine using the loop of tubing on the right side as a holder.
The machine can be shut off anytime by just pushing and releasing the On/Off button. The machine will shut off at the end of the next cycle.
To shut off immediately, push and hold the On/Off button in until the machine stops.
What shouldn’t be done?
Normal cubes are tapered cylinders. If the cubes are ragged and mis-shaped, mineral scale must be removed from the ice making system
Never keep anything in the ice storage bin that is not ice. Objects like wine or beer bottles are not only unsanitary, but the labels can slip off and plug up the drain.
Maintenance
There are 5 things to keep clean:
Never allow the machine to operate without regular cleaning. The machine will last longer if it is kept clean. Regular cleaning should happen at least once per year, and preferably twice. Some water conditions will dictate even more frequent cleaning of the ice making section, and some carpets or pets will dictate more frequent cleaning of the condenser.
1. The outside cabinet & door.
2. The ice storage bin.
3. The condenser.
4. The ice making system.
5. The ice scoop.
Note: The Time to Clean light will switch ON after 6 months of use. It will remain ON until the ice making system is cleaned using the process on page 13.
Noise:
How to clean the cabinet.
Wipe off any spills on the surface of the door and handle as they occur. If anything spilled on the door or gasket dries onto the surface, wash with soap and warm water to remove.
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.
How to clean the ice storage bin.
The ice storage bin should be sanitized occasionally. It is usually convenient to sanitize the bin after the ice making system has been cleaned, and the storage bin is empty.
If ice making noise is objectionable, an appliance grade timer can be added to the power supply. Set the timer to turn the machine off at the time(s) of day when the noise is most objectionable.
A sanitizing solution can be made of 1 ounce of household bleach and two gallons of hot (95
115 o o
F.) water. Use a clean cloth and wipe the
F. – interior of the ice storage bin with the sanitizing solution, pour some of the solution down the drain.
Allow to air dry.
June 2008
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SCCG50 & SCCP50
Service Manual
How to clean the condenser and winterize.
Condenser cleaning
The condenser is like the radiator on a car, it has fins and tubes that can become clogged with dirt and lint. To clean:
1. Remove the kickplate and front service panel.
2. Locate the condenser surface.
Winterizing
1. Clean the ice making 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.
Rubber Cap
3. Vacuum the surface, removing all dust and lint.
Caution: Do not dent the fins.
4. Return the kickplate and front service panel to their original positions. Fasten them to the cabinet using the original screws.
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 inlet water valve; a tire pump could do the job.
8. Drain pump models should have about 1/2 gallon of RV antifreeze (propylene glycol) poured into the ice storage bin drain.
Note: Automotive antifreeze must NOT be used.
9. Switch off and unplug the machine.
June 2008
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SCCG50 & SCCP50
Service Manual
How to remove scale from the ice making system.
1. Scoop out all of the ice, either discard it or save it in an ice chest or cooler.
9. Pour a gallon of hot (95 o
F. – 115 o
F.) water into the bin to flush out the drain.
2. Press and HOLD the On/off button in for 3 seconds until the Green light goes out.
3. Press and HOLD the both the Clean-Reset and
On/Off buttons for 5 seconds. The Time to Clean light will blink on and off.
4. Pour 8 ounces of Scotsman Ice Machine Scale
Remover (available from a local Scotsman
Distributor or Dealer) into the ice machine reservoir.
10. Clean the bin liner of mineral scale by mixing some ice machine scale remover and hot water, and using that solution to scrub the scale off of the liner.
11. Rinse the liner with hot water.
12. Sanitize the bin interior.
13. Replace the ice removed in step 1.
14. Push and release the On/Off button to restart ice making.
The ice scoop should be washed regularly, wash it just like any other food container.
Pour Scale
Remover Here
5. Operate the machine for about ½ hour.
6. Push and release the On/Off switch. The machine will begin to flush out the cleaning solution.
7. Operate the machine for another ½ hour.
8. Push and release the On/Off switch. The machine will stop the cleaning process.
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SCCG50 & SCCP50
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System Information
Overall: Electrical Sequence:
•
Refrigerant: 8 oz R-134a
•
Compressor: Hermetic, 1300 BTUH, X HP
•
Condenser: Forced draft
•
Fan blade: 5 blade, 7 inch
•
Evaporator: Inverted, 24 cube cells. Copper cups attached to continuous serpentine
•
Metering device: Cap tube
•
Defrost method: Hot gas bypass with water assist
•
Spray method: 6 water jets
•
Water charge: 40 ounces
•
Water valve: 115 volt solenoid, .19 GPM
•
Water fill time: Varies with harvest time & purge setting
•
Spray pump: Pedestal type.
•
Drain pump: Magnetic drive, controlled by pressure switch
•
Purge method: Overflow standpipe
•
Control method: Electronic
•
Cycle control: Thermistor + timers
•
Freeze cycle timer: 10 minutes, + - 4
•
Harvest cycle timer: 20 seconds, + - 40
•
Cube size adjustment: Freeze timer change.
•
Harvest cycle adjustment: Harvest timer change
•
Bin control: Thermostat. Opens on temperature fall, Cut Out: 35 degrees F. Cut
In 45 degrees F. Range is adjustable.
A closed bin thermostat signals to the controller a need for ice. The controller checks for water, if water is needed , the controller opens the inlet water solenoid valve to fill the reservoir. The hot gas valve is open to equalize the system. When the reservoir is full, the compressor, fan motor, water pump are switched on. After 5 seconds the hot gas valve shuts and ice making begins.
Water is sprayed up into 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 the controller switches to the harvest cycle.
The harvest cycle begins with the controller stopping the water pump and fan motor. At the same time it opens the hot gas valve and the inlet water solenoid valve. The ice is released by the combination of discharge refrigerant gas entering the evaporator serpentine and warming up the copper, plus the inlet water that flows to the evaporator, floods across the plastic platen to warm it up and be pre-chilled for the next cycle. Ice cubes drop individually and harvest continues until the thermistor attached to the suction line warms up to about 50 degrees F. At that point a harvest timer starts, whose default time is 20 seconds. At the end of that time the harvest cycle ends and the freeze cycle restarts.
Electrical Components:
•
Compressor
•
Fan motor
•
Spray pump motor
•
Drain pump motor
•
Drain pump switch
•
Bin light - LED type
•
Bin light switch - magnetic reed
•
Inlet water solenoid valve
•
Hot gas valve
•
Transformer
•
Controller
•
Water sensor
•
Thermistor
•
Bin thermostat
Bin control.
The machine's on and off modes are regulated by a bin thermostat. The cap tube for the bin thermostat is in the tube that holds the scoop. The machine will only begin ice making when the thermostat's contacts close. If the contacts re-open before the temperature of the evaporator drops below a preset point, the machine will stop. If the temperature is below that point when the contact s open, the machine will continue through a complete cycle and stop at the end of the harvest cycle.
September 2008
Page 19
SCCG50 & SCCP50
Service Manual
Water System
The controller uses a Water Sensor to check for the presence of water in the reservoir and to measure the conductivity of the water.
The water sensor consists of two stainless steel probes located in a holder next to the water pump.
The probes sense the conductivity of the water.
The higher the mineral content of the water, the better it can conduct electricity. The control system is capable of sensing water as clean as 10 microSiemens/cm.
If the controller cannot sense water and the bin thermostat is closed the controller will power the inlet water solenoid valve to fill the reservoir. The water fill is timed. There is a maximum amount of time allowed from the time the controller turned on the inlet water valve until the water sensor signals to the controller. That time is 2 minutes. If water is not sensed within 2 minutes, the controller will not proceed 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, eventually the ice machine would become coated with mineral scale.
To combat the mineral build up, the reservoir water is diluted with fresh water every cycle. The controller adds enough water to fill the reservoir and extra water to overfill it. The extra water drains out through the standpipe in the reservoir.
The controller keeps the inlet water solenoid valve open until the evaporator temperature set point is reached, plus some extra time. The extra time is either pre-set or automatically determined by the controller.
Pump
Evaporator
Reservoir
Drain
Freeze Cycle Water Schematic
Standpipe
Inlet Water Solenoid Valve
Harvest Cycle Water Schematic
June 2008
Page 20
SCCG50 & SCCP50
Service Manual
Components
Scoop and Thermostat Bracket
Model and
Serial Tag
Location
Control Panel, Bin Light and Curtain
Evaporator Platen Evaporator and Controller
Inlet Water Solenoid Valve
June 2008
Page 21
Condenser and Bin Thermostat
SCCG50 & SCCP50
Service Manual
Controller
High
Voltage
Connector
Evaporator
Thermistor
Comp
Water
Hot Gas
Fan
Power Supply
Connector
Power
Bin
Thermostat
Water Sensor
Bin Light
Control Panel
Ribbon
The controller is located at the front of the unit, under the top panel.
Control Safeties:
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
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.
June 2008
Page 22
SCCG50 & SCCP50
Service Manual
Performance Information
Freeze Cycle, Minutes
Water
Temperature
60
50
40
100
90
80
70
100
37-38
36-37
36-35
32-33
27-28
20-21
18-19
90
36-37
35-36
32-33
28-29
25-26
19-20
17-18
80
Air Temperature
70
34-35
33-34
30-31
27-28
24-25
18-19
16-17
32-33
31-32
28-29
25-26
22-23
17-18
15-16
60
31-32
30-31
27-28
23-24
20-21
16-17
15-16
50
29-30
28-29
26-27
22-23
19-20
15-16
15-16
Harvest Cycle, Seconds
Water
Temperature
80 -100
70 - 80
50 - 70
40 - 50
100
55-60
65-75
70-80
100-120
90
60-70
70-80
75-85
115-125
80
Air Temperature
70
70-80
75-85
80-90
85-95
85-95
130-140
125-135
150-170
60
90-100
95-105
140-150
180-200
50
110-115
115-120
160-170
210-230
Total Cycle, Minutes
Water
Temperature
100
90
80
70
60
50
40
100
38-39
38-39
37-38
33-34
29-30
21-22
20-21
90
37-38
36-37
33-34
29-31
27-28
20-21
19-20
Ice per cycle: 1 lb
Water drained / cycle: Varies by harvest cycle length and purge setting. Typical amounts are @
70/50 = 52 oz. @ 90/70 = 13 oz
Compressor amps: 2.6 - 3.2
80
Air Temperature
70
36-37
35-36
34-35
33-34
31-32
28-29
25-26
19-20
19
30-31
26-27
24-25
19-20
18-19
60
33-34
32-33
29-30
25-26
22-23
19
19
50
31-32
30-31
27-28
24-25
21-22
18-19
19-21
June 2008
Page 23
150
140
130
120
110
100
90
80
70
60
50
Refrigeration System
10
0
-10
40
30
20
70
60
50
Suction Pressure
Time
Discharge Pressure
Time
June 2008
Page 24
SCCG50 & SCCP50
Service Manual
SCCG50 & SCCP50
Service Manual
Thermistor Values
Deg. F · Ohms
0· · · · 85325
1· · · · 82661
2· · · · 80090
3· · · · 77607
4· · · · 75210
5· · · · 72896
6· · · · 70660
7· · · · 68501
8· · · · 66415
9· · · · 64400
10 · · · 62453
11 · · · 60571
12 · · · 58752
13 · · · 56995
14 · · · 55296
15 · · · 53653
16 · · · 52065
17 · · · 50529
18 · · · 49043
19 · · · 47607
20 · · · 46217
21 · · · 44872
22 · · · 43571
23 · · · 42313
24 · · · 41094
25 · · · 39915
26 · · · 38774
27 · · · 37669
28 · · · 36600
29 · · · 35564
30 · · · 34561
31 · · · 33590
32 · · · 32649
33 · · · 31738
34 · · · 30855
35 · · · 30000
36 · · · 29171
37 · · · 28368
38 · · · 27589
39 · · · 26835
40 · · · 26104
41 · · · 25395
42 · · · 24707
43 · · · 24041
44 · · · 23394
45 · · · 22767
46 · · · 22159
47 · · · 21569
48 · · · 20997
49 · · · 20442
50 · · · 19903
51 · · · 19381
Deg. F · Ohms
52 · · · 18873
S3 · · · 18381
54 · · · 17903
55 · · · 17439
56 · · · 16988
57 · · · 16551
58 · · · 16126
59 · · · 15714
60 · · · 15313
61 · · · 14924
62 · · · 14546
63 · · · 14179
64 · · · 13823
65 · · · 13476
66 · · · 13139
67 · · · 12812
68 · · · 12494
69 · · · 12185
70 · · · 11884
71 · · · 11592
72 · · · 11308
73 · · · 11031
74 · · · 10763
75 · · · 10502
76 · · · 10247
77 · · · 10000
78 · · · 9760
79 · · · 9526
80 · · · 9299
81 · · · 9077
82 · · · 8862
83 · · · 8652
84 · · · 8448
85 · · · 8250
86 · · · 8056
87 · · · 7868
88 · · · 7685
89 · · · 7507
90 · · · 7333
91 · · · 7164
92 · · · 6999
93 · · · 6839
94 · · · 6683
95 · · · 6530
96 · · · 6382
97 · · · 6238
98 · · · 6097
99 · · · 5960
100 · · 5826
101 · · 5696
102 · · 5569
103 · · 5446
Deg. F. · Ohms
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
104 · · 5325
105 · · 5208
106 · · 5093
107 · · 4981
108 · · 4872
109 · · 4766
110 · · 4663
111 · · 4562
112 · · 4463
113 · · 4367
114 · · 4273
115 · · 4182
116 · · 4093
117 · · 4006
118 · · 3921
119 · · 3838
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
June 2008
Page 25
Deg. F.
Ohms
172 · · 1350
173 · · 1326
174 · · 1302
175 · · 1279
176 · · 1256
177 · · 1234
178 · · 1212
179 · · 1190
180 · · 1169
181 · · 1149
182 · · 1129
183 · · 1109
184 · · 1090
185 · · 1071
186 · · 1052
187 · · 1034
156 · · 1819
157 · · 1785
158 · · 1752
159 · · 1719
160 · · 1687
161 · · 1655
162 · · 1624
163 · · 1594
164 · · 1565
165 · · 1536
166 · · 1508
167 · · 1480
168 · · 1453.
169 · · 1427
170 · · 1401
171 · · 1375
188 · · 1016
189 · · 998
190 · · 981
191 · · 965
192 · · 948
193 · · 932
194 · · 916
195 · · 901
196 · · 885
197 · · 871
198 · · 856
199 · · 842
200 · · 828
201 · · 814
202 · · 800
203 · · 787
204 · · 774
205 · · 761
206 · · 749
207 · · 737
Deg. F. · Ohms
224 · · 560
225 · · 551
226 · · 543
227 · · 534
228 · · 526
229 · · 518
230 · · 510
231 · · 502
232 · · 495
233 · · 487
234 · · 480
235 · · 472
236 · · 465
237 · · 458
238 · · 451
239 · · 444
208 · · 724
209 · · 713
210 · · 701
211 · · 690
212 · · 679
213 · · 668
214 · · 657
215 · · 646
216 · · 636
217 · · 626
218 · · 616
219 · · 606
220 · · 597
221 · · 587
222 · · 578
223 · · 569
240 · · 438
241 · · 431
242 · · 425
243 · · 419
244 · · 412
245 · · 406
246 · · 400
247 · · 394
246 · · 389
249 · · 383
250 · · 377
SCCG50 & SCCP50
Service Manual
Service Diagnosis
No Ice
Problem
No power to unit
No power to controller
Shut down on maximum water fill time - water light flashing
Likely Cause
Power disconnected
Transformer open
Water shut off
Very long freeze cycle
Cannot make ice
Water leak
Dirty condenser
Restricted location, intake air too hot or blocked
Evaporator thermistor not sensing properly
Spray jets dirty
Inlet water valve leaks through during freeze
Low on refrigerant
Connected to hot water
Spray pump not pumping
Fan motor not turning
Pump hose disconnected
Very low on refrigerant
Compressor not operating
Hot gas valve leaks through during freeze
Compressor inefficient
Probable Solution
Check breaker or fuse. Reset or replace, restart and check
Replace transformer
Restore water supply
Check curtain, sump
Clean condenser
Eliminate restriction, have machine moved
Check thermistor
Remove spray platform and clean spray jets
Check inlet water valve
Check cube formation,
Check for bleed thru from / missing check valve in building water supply
Check pump motor
Check fan motor, check fan blade, check controller for voltage output
Check hose
Add access valve, add refrigerant as a test. If unit makes ice, find and correct leak.
Check compressor start components, check PTCR resistance and temperature
Check compressor voltage
Check compressor windings
Check hot gas valve for hot outlet during freeze
Check compressor amp draw, if low and all else is correct, change compressor
June 2008
Page 26
SCCG50 & SCCP50
Service Manual
Service Diagnosis
Makes excessive noise
Problem
Fan blade vibrates
Compressor vibrates
Water pump vibrates
Panels vibrate
Makes ice, does not harvest
Likely Cause
Blade is bent
Fan motor mount is broken
Mounting loose
Pump bearings worn
Mounting screws loose
Problem
Ice wrong size
Likely Cause
Environment changed
Hot gas valve does not open
Little heat to evaporator
Problem
Restricted drain
Pooled water in bin
Water temperature very low
Fan motor does not stop
Makes poor quality ice
Problem
Spray pattern poor
Runs out of water
High TDS water supply
Makes ice, but melts rapidly
Likely Cause
Spray jets dirty
Water leaking from reservoir
Groundwater supply
Likely Cause
Gravity drain hose has air block
Pump model switch not starting pump
Probable Solution
Replace fan blade
Replace motor mount
Check mounting
Replace pump
Tighten screws
Probable Solution
Adjust cube size
Check voltage to coil when unit is in harvest, check controller indicator light.
Adjust harvest time
Check voltage, replace controller
Probable Solution
Clean jets
Correct leak
Treat water
Probable Solution
Check for kinks or traps
Check / replace switch
June 2008
Page 27
SCCG50 & SCCP50
Service Manual
Removal and Repair
Bin Thermostat
1. Disconnect electrical power.
Electrical Shock
Hazard.
Disconnect electrical power before beginning removal
2. Remove service panel.
3. Remove back panel.
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.
Note: If unit is built in it must be pulled out to change the bin thermostat.
4. Pull cap tube out from the back of the ice storage bin and cap tube holder.
5. Remove two screws and the bin thermostat contact section from its mounting bracket.
6. Disconnect two wires from the bin thermostat contact section and remove the thermostat from the ice machine.
7. Reverse to reinstall.
Inlet Water Solenoid Valve
Spray Platform
1. Remove curtain.
2. Lift spray platform up until it disconnects from its fitting.
3. Pull forward and remove from the ice machine.
4. Reverse to reassemble.
Water Pump
1. Remove spray platform
2. Remove back panel.
Note: If unit is built in it must be pulled out to change the water pump.
1. Disconnect electrical power.
2. Remove service panel.
3. Shut water supply OFF.
4. Disconnect inlet water supply tube from inlet water solenoid valve.
5. Unplug wire harness from valve 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.
3. Disconnect power and ground wires from pump motor.
4. Rotate pump body CW and lift up to remove it.
5. Reverse to reassemble.
June 2008
Page 28
SCCG50 & SCCP50
Service Manual
Removal and Repair
Evaporator Thermistor
Note: If unit is built in it must be pulled out to change the evaporator thermistor.
5. Remove screws holding transformer to controller box and pull transformer up and out of the ice machine.
6. Reverse to reassemble.
Controller
Electrical Shock
Hazard.
Disconnect electrical power before beginning removal
1. Shut machine off. If unit was making ice, manually harvest the ice.
2. Disconnect electrical power.
3. Remove top panel.
4. Remove cover from controller box.
5. Disconnect thermistor wire from controller.
6. Locate thermistor sensor, it is attached to the suction line, just above the accumulator and is covered with insulation tape. Remove the insulation.
7. Disconnect sensor bulb from suction line (it's held on with a metal clip).
8. Remove thermistor from ice machine.
9. Reverse to reassemble. It is very important that the bulb be re-insulated.
Transformer
Note: If unit is built in it must be pulled out to change the transformer.
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 damaging the controller, touch the metal chassis of the unit prior to touching the replacement controller.
6. Reverse to reassemble.
Control Panel
1. Disconnect electrical power.
2. Remove top panel
3. Remove controller box cover.
4. Unplug ribbon cable connection.
5. Push control panel away from the front of the machine. Begin at the ribbon cable attachment point.
Note: Control panel is held on by adhesive and the adhesive is thinnest at the cable point.
1. Disconnect electrical power.
2. Remove top panel.
3. Remove controller cover.
4. Unplug leads from transformer.
6. Separate control panel from controller box and remove from the ice machine.
7. Reverse to reassemble.
June 2008
Page 29
SCCG50 & SCCP50
Service Manual
Removal and Repair - Cabinet Removal
Certain components require the removal of the cabinet for repair access.
1. If the machine is in a freeze mode, perform a manual harvest.
2. Remove all ice.
3. Drain reservoir.
4. Remove service panel and kick plate.
5. Remove back panel.
6. Disconnect electrical power.
12. Remove curtain & hanger.
13. Locate elbows where water flows onto the evaporator platen.
Clip
Electrical Shock
Hazard.
Disconnect electrical power before beginning removal
Inlet
Elbow
7. Disconnect water and drain tubing.
8. Remove door.
9. Remove top panel.
10. Remove controller box cover.
11. Disconnect thermistor from controller, pull wire back to suction line.
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.
Thermistor
Connector
Inlet
Elbow
Inner
Elbow
15. Pull water inlet elbow out of inner elbow.
June 2008
Page 30
SCCG50 & SCCP50
Service Manual
18. Remove two screws holding freezing compartment brace to cabinet, lift brace up.
Brace
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.
19. Lift evaporator platen up and tilt back enough for bin assembly to clear the base.
Air Baffle
20. Remove air baffle.
21. Unplug 7 wire harness connector (at back of bin).
22. Remove 1 screw at each corner of the base.
June 2008
Page 31
Chassis Shown in Front of Bin Assembly
Refrigeration Service
This ice machine use R-134a type refrigerant.
There are specific rules for handling that refrigerant.
To check for system pressures, add a field supplied clamp-on type service valve as a temporary means of system access. After diagnosis and before final repair, replace the clamp-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 charged and a partial ounce mis-charge will affect performance.
SCCG50 & SCCP50
Service Manual
June 2008
Page 32
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