INTRODUCTION
CME1356 and CME1656
This product manual contains the information
needed for the setup, installation, initial start up,
sanitation and maintenance of this ice machine.
Keep it for future reference.
There are 2 models covered in this manual:
• CME1356, having 5 evaporators
• CME1656, having 6 evaporators
TABLE OF CONTENTS
Specifications .................PAGE2
Air Cooled Layout ...............PAGE3
Water Cooled Layout .............PAGE4
Pre-Installation .................PAGE5
Location & Assembly .............PAGE6
Stacking ....................PAGE7
Be certain that the information applies to the model
in question. If no model is listed, the information
applies to all models.
This manual is organized in the same way as the
expected use of the machine, it begins with
specifications, goes thru unpacking and setup,
shows where everything is; continues with initial
start up, then describes how it works. After that is
the sanitation section, followed by service diagnosis
and repair.
Technicians Only: Harvest Cycle Operational
Sequence ...................PAGE23
Sanitation and Cleaning ............PAGE24
Additional Maintenance ............PAGE25
Additional Maintenance: Water Distributors . . PAGE 26
Additional Maintenance: Inlet Water Valve
Screen .....................PAGE27
Stacking ....................PAGE8
Bin Control: Installation ............PAGE9
Bin Control ...................PAGE10
Plumbing ....................PAGE11
Electrical ....................PAGE12
After Utility Connections ............PAGE13
Component Description and Function .....PAGE14
System Controller ...............PAGE15
Initial Start Up .................PAGE16
Adjustments ..................PAGE17
Adjustments ..................PAGE18
How To Operate The System Controller . . . PAGE 19
How The Electronic Cuber Works .......PAGE20
Additional Maintenance: Ice Sensors, Condenser
........................PAGE28
Service Diagnosis: Controller Diagnostic Light
Analysis ....................PAGE29
Service Diagnosis ...............PAGE30
Service Diagnosis: Components .......PAGE31
PTCR .....................PAGE32
Operational Characteristics: CME1356 ....PAGE33
Operational Characteristics: CME1656 ....PAGE34
Removal and Replacement ..........PAGE36
Removal and Replacement: System Controller PAGE 37
Removal and Replacement: Water Level Sensor
........................PAGE37
Removal and Replacement: Fan Blade and/or Fan
Motor .....................PAGE38
How The Electronic Cuber Works .......PAGE21
Technicians Only: Freeze Cycle Operational
Sequence ...................PAGE22
Parts Lists and Wiring Diagrams are Located in the Center of this Manual
May 2000
Page 1
Access Valves .................PAGE39
Liquid Charging ................PAGE40
Before Calling for Service ...........PAGE41
CME1356 and CME1656
Specifications
These ice machines are designed to be installed
indoors, in a controlled environment. They can
operate satisfactorily under a wide variety of
conditions. Do NOT operate the machine in
temperatures it has not been designed for. Do
NOT operate the machine above or below the
voltage limits for the particular model. Do NOT
operate the machine with too little or too much
water pressure.
Operational Limits
Minimum Maximum
Air Temperature 50
Water Temperature 40
Water Pressure 20 psi 80 psi
Voltage (60 Hz model) 198 253
Voltage (50 Hz model) 207 253
Inlet water flow required is 2.7 GPM.
A stacking kit, for
like models, is KSCME6-LG-B
o
F. 100oF.
o
F. 100oF.
Voltage note: The control system transformer in
the control box of this ice machine has two primary
taps, one for 208 volt power and one for 240 volt
power. The machine ships with the power supply
connected to the 208 volt tap. Change to the 240
volt tap when the voltage supplied to the unit is
greater than 229 volts
All models will fit a standard, 48" wide Scotsman
Ice Storage Bin. Some examples are BH900,
BH1100, BH1300, BH1600. There may be other
bins that can be used, check Scotsman’s sales
literature for application information. Slope front
bins must have an internal baffle like the BH900.
Baffle must be approximately in the position shown
in the diagram on page 5.
Scotsman reserves the right to make design
changes and/or improvements at any time.
Specifications and designs are subject to change
without notice.
Dateplates on the ice machine contain charge and
electrical requirements. Always go by the dataplate
information. The table below is for reference.
Basic Information
Model Number
CME1356AS-32 A thru E 48 ½ x 24 x 28 208-230/60/1 Air Cooled 26.7 30 64 ounces
CME1356WS-32 A thru E same 208-230/60/1 Water Cooled 23.9 30 62 ounces
CME1356WS-32 F same 208-230/60/1 Water Cooled 23.9 30 58 ounces
CME1356AS-3 A thru E same 208-230/60/3 Air Cooled 17.8 20 64 ounces
CME1356WS-3 A thru E same 208-230/60/3 Water Cooled 14.9 20 62 ounces
CME1356WS-3 F same 208-230/60/3 Water Cooled 14.9 20 58 ounces
CME1356AS-6 A thru E same 230/50/1 Air Cooled 26.7 30 64 ounces
CME1356WS-6 A thru E same 230/50/1 Water Cooled 23.9 30 62 ounces
CME1356WS-6 F same 230/50/1 Water Cooled 23.9 30 58 ounces
CME1656AS-32 A thru D same 208-230/60/1 Air Cooled 26.7 30 64 ounces
CME1656WS-32 A thru E same 208-230/60/1 Water Cooled 23.9 30 62 ounces
CME1656WS-32 F same 208-230/60/1 Water Cooled 23.9 30 58 ounces
CME1656AS-3 A thru E same 208-230/60/3 Air Cooled 17.8 20 64 ounces
CME1656WS-3 A thru E same 208-230/60/3 Water Cooled 14.9 20 62 ounces
CME1656WS-3 F same 208-230/60/3 Water Cooled 14.9 20 58 ounces
Model
Series
Dimensions
W" x D" x H"
(w/o bin)
Basic
Electrical
Condenser
Type
Minimum
Circuit
Ampacity
Maximum
Fuse
Size
Refrigerant
Charge
(R-404A)
CME1656AS-6 A thru E same 230/50/1 Air Cooled 26.7 30 64 ounces
CME1656WS-6 A thru E same 230/50/1 Water Cooled 23.9 30 62 ounces
CME1656WS-6 F same 230/50/1 Water Cooled 23.9 30 58 ounces
November 2004
Page 2
Air Cooled Layout
CME1356 and CME1656
26.10 in
66.3 cm
MINIMUM BIN
TOP OPENING
6.00 in
15.2 cm
MINIMUM FOR
UTILITY CONNECTIONS
6.00 in
15.2 cm
MINIMUM FOR
AIR VENTILATION
PLAN VIEW
CONDENSER FINS
4.20 in
10.7 cm
ICE
OPENING
.88 DIA. KNOCKOUT
ELECTRICAL INLET
10.15 in
25.8 cm
2.50 in
6.4 cm
AIR VENTILATION
WATER INLET
3/8" FLARE
18.75 in
47.6 cm
3.81 in
9.7 cm
6.00 in
15.2 cm
MINIMUM FOR
ICE
OPENING
BACK VIEW
DUMP
VALVE
DRAIN
3/4" F.P.T.
23.87 in
60.6 cm
12.30 in
31.2 cm
5.87 in
14.9 cm
1.96 in
5.0 cm
2.82 in
7.2 cm
May 2000
Page 3
CME1356 and CME1656
Water Cooled Layout
26.10 in
66.3 cm
MINIMUM BIN
TOP OPENING
6.00 in
15.2 cm
MINIMUM FOR
UTILITY CONNECTIONS
6.00 in
15.2 cm
MINIMUM FOR
AIR VENTILATION
INLET WATER
3/8" FLARE
PLAN VIEW
4.20 in
10.7 cm
ICE
OPENING
CONDENSER INLET
3/8" F.P.T.
.88 DIA. KNOCKOUT
ELECTRICAL INLET
10.15 in
25.8 cm
2.50 in
6.4 cm
18.75 in
47.6 cm
3.81 in
9.7 cm
CONDENSER DRAIN
1/2" F.P.T.
ICE
OPENING
23.30 in
59.2 cm
BACK VIEW
DUMP
VALVE
DRAIN
3/4" F.P.T.
5.96 in
15.1 cm
May 2000
Page 4
18.67 in
47.4 cm
5.87 in
14.9 cm
3.58 in
9.1 cm
21.87 in
55.5 cm
11.87 in
30.1 cm
2.46 in
6.2 cm
23.87 in
60.6 cm
Pre-Installation
Other Applications:
Check Scotsman sales information for
recommendations regarding applications.
Check the nameplate for electrical requirements.
The nameplate is located on the back of the ice
machine. While the model and serial number are
on the nameplate, a serial number plate is located
at the front of the machine, near the purge valve..
Water:
There is no such thing as pure water. All water
contains some impurities. There are two ways
water carries the impurities: suspended and
dissolved. Suspended solids can be filtered out.
Dissolved solids must be diluted or treated. Water
filters are recommended to remove suspended
solids. Some filters have treatment in them for
suspended solids. Check with a water treatment
service for a recommendation.
CME1356 and CME1656
Nameplate
Cube Ice machines use more water than 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 at a “standard” water
rinse, which is compatible with typical water
conditions. They may be adjusted to “Minimum" or
“Maximum" water rinse after start up. If the prior
ice machine worked acceptably well with the local
water conditions, leave the machine at the factory
setting. If severe water conditions are present, and
water filters do not solve the problem acceptably,
adjust the machine to use more water. If water
conditions are excellent, adjust the machine to use
less water. See the Adjustments section.
Note: Water use adjustments are customer
convenience adjustments; they are NOT factory
defects and are NOT covered by warranty.
Serial Number Plate
Note: Slope front bins must have an internal baffle.
Scotsman’s BH900 has the required baffle. Baffle
must be approximately in the position shown in the
diagram.
Baffle
12.0"
May 2000
Page 5
4.0"
Side View
CME1356 and CME1656
Location & Assembly
The air cooled models take room temperature air
in from the left side and the front and discharge
warm air out the back.
A 6 inch minimum clearance on the back, and
both sides is required for the proper operation and
service of the air cooled model.
Unpacking and Assembly:
Begin with unpacking the ice storage bin. Remove
the carton, and using part of the carton as a
cushion, tip the bin on its back to remove the skid
and attach the legs or casters.
Cabinet Panel Removal:
Note: The top panel holds the upper edges of the
side panels in place.
1. Remove the front panel by removing the two
screws connecting the front panel to the machine.
2. Lift up at the front edge and push the top panel
back until it releases from the tabs connecting it to
the back panel.
3. Remove the screws at the front edge of the left
side panel, and pull forward until it releases from
the tabs connecting it to the back panel.
Note: Stacked applications may not use casters.
Return the bin to an upright position. Check the
bin top gasket for gaps and tears, fill any in with
food grade sealant prior to placing the ice machine
on the bin.
Level 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. After
removal of the shipping straps, lift the ice machine
off the skid directly onto the bin.
Note: The machine is heavy! Use a mechanical
hoist if necessary.
Secure the ice machine to the bin with the
hardware provided (two metal straps and 4 bolts).
Locate the Bin Thermostat Bracket and hardware.
Retain for later use.
Aiir cooled: Remove baffle from its shipping
position and secure to the back of the cabinet.
Follow the directions on the baffle for proper
installation.
August 2003
Page 6
Stacking - Kit KSCME6-LG-B
CME1356 and CME1656
Only like models may be stacked. Begin after the
bottom unit has been placed on the ice storage
bin and secured. Stacking requires heavy duty leg
kits. Casters are NOT recommended.
Note: Instructions are for either model.
Bottom Machine:
1. Remove front panel, left side panel, and top
panel.
2. Remove & discard top cover from over the
freezing compartment.
3. Install gasket materials to freezing compartment:
Cut about 22" of gasket material from the roll in
the kit. Apply it to the back side top edge of the
freezing compartment.
Cut two lengths of gasket material to fit the right
side top edge of the freezing compartment and
apply them.
4. Place a bead of food grade sealant to the top of
the back wall’s gasket.
5. Place the shield bracket (has a large hole in the
center) from the kit over the center of the freezing
compartment.
Insert the tabs of the bracket into slots on the
back of the unit.
6. Secure bracket at the front with screws from the
kit.
7. Hang the plastic shields from the bracket
installed in the prior step. Use the slots in the
shields to hang them from the stainless steel
hooks.
Note: The notch in the bottom of the shield goes
to the front.
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 left side panels.
13. At the back of the ice machines, on the
compressor end, remove the upper knock-out from
the bottom machine and the lower knock out from
the upper machine.
14. Place a strain relief (from the kit) into each hole.
15. Insert wire harness from kit thru strain-relief
and hole in upper corner of the lower ice machine’s
back panel.
NOTE: Harness is marked which end goes to
which machine.
Bottom Machine:
16. Remove harness from controller terminal 7 and
bin thermostat.
17. Route wire harness in lower ice machine to the
controller. Connect to terminal #7. Plug the two free
wires onto the thermostat terminals #1 and #2.
18. Return left side panel to its original position on
the lower ice machine.
Top Machine:
19. Remove harness from controller terminal 7.
20. Route wire harness thru upper unit’s lower
knock-out hole and strain relief and continue
internally to the controller. Plug wire onto terminal 7
of the controller.
Note: The tabs on the shields must fit inside the
ice outlet port.
8. Check the position of the shields. They must
move freely and be vertical.
Note: The suction line may need to be moved
slightly so the tubing clears the bracket & shields.
9. Place a bead of food grade sealant onto the top
left edge of the freezing compartment.
10. Install the front-to-back support bracket over
the left edge of the freezing compartment.
May 2001
21. Return all panels and covers to their normal
positions.
22. Complete the balance of the installation.
Service Notes:
A. The shields must be positioned so they hang
vertically and move freely left to right. Their
purpose is to guide the ice past the bottom
machine’s evaporators and into its cube port.
B. The drain lines from each ice machine must be
kept separate.
Page 7
CME1356 and CME1656
Stacking
Upper Unit
Gasket on
Plastic Wall of
Lower Unit
Gasket for Metal
Edges of Bottom
Unit
Mounting
Straps and
Hardware
Front-to-Back
Bracket
Shield Hanger
Bracket
Shield
May 2001
Page 8
Bin Control: Installation
CME1356 and CME1656
The bin control is a thermostat. It must be field
installed after the ice machine has been placed on
the bin.
Before starting, remove the left front panel and any
baffle in the bin.
1. Locate bin thermostat bulb.
2. Route bulb thru routing tube (located between
the compressor and the reservoir).
3. Locate bin thermostat bracket.
4. Carefully position the thermostat bulb on the
bracket (see the diagram on the next page).
5. Fasten the bracket to the bottom of the ice
machine 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 Altitude Correction Table
CW Turns of Range Screw (under plastic cover)
Feet Turns Feet Turns
2000 55
4000 160
6000 250
o
o
o
8000 340
9000 385
10000 405
o
o
o
Use This Table to Adjust Thermostat
Bin
Thermostat
Body
Bin Thermostat Bulb
Thermostat
Bulb
Routing
Tube
Route Bin Thermostat Bulb Into Bin
May 2000
Page 9
CME1356 and CME1656
Bin Control
Bin Thermostat
Bracket
Insert Bulb
Tip Here
Bin Thermostat
Capillary Tube
Mount Thermostat
Capillary Tube Here
Attach Thermostat Bulb to Bracket
Minimize Excess
Tube in Bin
Three-Pronged
Knob
Thermostat and
Bracket
Attach Bracket to Bottom of Ice Machine
May 2000
Page 10
Plumbing
CME1356 and CME1656
All models require an adequate potable water
supply and a gravity drain. The recommendations
for tubing are:
• Water supply to be
• Drain to be
3
⁄4" OD.
3
⁄8" OD.
Note: When replacing a prior ice machine, do not
take a short cut and reuse the old inlet and drain
system. INSTALL A NEW SYSTEM.
Supply:
Air cooled models have 1 water supply connection,
3
⁄8" male flare at the back of the cabinet. Connect
a
to cold potable water that has adequate pressure.
Note: Using water supply tubing smaller than3⁄8"
will cause severe operational issues.
Water cooled models have an additional " FPT
3
8
condenser inlet connection at the back of the
cabinet.
Water Filters:
The water 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:
Air cooled models have 1 gravity drain connection,
3
⁄4" FPT fitting at the back of the cabinet. Use only
a
RIGID TUBING. Flexible tubing may be easily
kinked or become cracked.
The drain tube must be vented at the back of the
cabinet. Use an 18" high vent.
Water cooled models have an additional condenser
drain. It is a ½ “ FPT fitting at the back of the
cabinet. Do NOT vent this drain.
The ice storage bin will have a drain out the back or
base, depending upon the model.
The drain for the ice machine and the ice storage
bin must be SEPARATE or the ice machine’s drain
water may run into the bin and MELT THE ICE.
Insulation is recommended for the ice machine
reservoir and bin drains.
Follow all applicable codes
Potable
Water Inlet
Vent
Water Inlet
Drain
Bin Drain
Floor Drain
May 2000
Page 11
CME1356 and CME1656
Electrical
All models must be installed with the correct wire
size and type per the National Electric Code.
Locate the nameplate on the back of the cabinet
and find the numbers for Voltage, Phase, Minimum
Circuit Ampacity and Maximum Fuse Size. Either
fuses or HACR type circuit breakers may be used.
Electrical connections are made in the junction box
in the back of the cabinet.
1. Remove the junction box cover.
2. Knock out 1 hole for a field supplied strain relief.
3. Install wires and strain relief per code.
4. Connect to wires and secure ground wire to
ground screw inside the junction box.
Follow all Local, State and National codes.
Electrical
Power Supply
Condenser
Water
Supply
Junction Box
Condenser
Drain
Water Cooled Model Shown
May 2000
Page 12
After Utility Connections
1. Level the cabinet, use the leg levelers on the
end of the legs to adjust the cabinet height.
2. Wash out the bin. If desired, the interior of the
bin could be sanitized.
3. Locate the ice scoop (if supplied) and have it
available for use when needed.
Final Check List:
___ 1. Is the unit located indoors in a controlled
environment?
___ 2. Is the unit located where it can receive
adequate cooling air?
___ 3. Has the correct electrical power been
supplied to the machine?
___ 4. Have all the water supply connections been
properly made?
CME1356 and CME1656
___ 5. Have all the drain connections been properly
made?
___ 6. Has the unit been leveled?
___ 7. Have all unpacking materials been removed?
___ 8. Has the bin control been installed?
___ 9. Is the water pressure adequate?
___ 10. Have the drain connections been checked
for leaks?
___ 11. Has the bin interior been wiped clean or
sanitized?
___ 12. Have any water filter cartridges been
replaced?
May 2000
Page 13
CME1356 and CME1656
Component Description and Function
Reservoir: Contains the water for ice making.
Water Inlet Valve: Opens to allow water into the
reservoir.
Water Level Sensor: Controls the size of the ice
cube by measuring how much water is used in a
cycle. It consists of a float, stem and electric eye.
The stem will move slightly when the pump is on,
this is normal. As the machine makes ice the
reservoir water level will fall and the visible portion
of the stem will slide down thru the slot in the
sensor body.
Evaporators/Freezing Compartment: Location
of the evaporators. Ice forms on the evaporators
and is released when warmed up during the
harvest cycle. The freezing compartment is fully
insulated for maximum efficiency.
Cube Deflectors: The slots in the inclined
deflectors let the water falling from the evaporators
back into the reservoir, but when ice falls during
harvest, the ice slides off into the bin.
Refrigeration Service Access Valves: Only to be
used by a certified technician. Allows access to the
refrigeration system for diagnostic information.
Water Pump: Forces the water from the reservoir
to the top of the evaporators. The motor is
separated from the reservoir water to minimize
contact with the water.
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 early part of the
harvest cycle to drain the reservoir.
Ice Sensor: A photo-electric eye
set, located at the front and
back of the cube port.
Hot Gas Valve
Water Pump
Evaporators
Cube
Deflector
Cube Port
Inlet Water Valve
Purge Valve
Reservoir
Water Level
Sensor
May 2000
Page 14
AutoIQ Controller
CME1356 and CME1656
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 mode is pending.
• Harvest: On when the unit is in the Harvest
cycle.
• Clean: On when the unit is in the Clean
cycle, blinks when preparing for a clean
mode.
• 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.
LOW VOLTAGE IN/OUT
WATER VALVE
HOT GAS VALVE
PURGE VALVE TIMER
CONTACTOR COIL
Cycle Definitions:
• Freeze: The refrigeration system is operating
to remove heat from the evaporators. The
compressor, fan motor (if air cooled) and
water pump are ON.
• Harvest: The refrigeration and water
systems are operating to harvest the ice
cubes. While the compressor is on for the full
cycle, the water pump will be off at the
beginning and inlet water valve will switch off
before the end.
• Clean: The Inlet Water Valve opens to fill the
reservoir. The Water Pump starts. The Clean
indicator light is switched ON. A manually
initiated rinse flushes the system.
HI VOLTAGE IN/OUT
WATER PUMP
89
STACKING and/or
THERMOSTAT
FUTURE USE
RESERVOIR & DISCHARGE
LINE THERMISTORS
ICE SENSOR
ICE SENSOR
RESERVOIR WATER
LEVEL SENSOR
FACTORY USE
7
6
5
4
3
2
1
PUSH BUTTON
CONTROL SWITCHES
INDICATOR LIGHTS:
BIN FULL
FREEZE
HARVEST
CLEAN
OFF
DIAGNOSTIC LIGHTS:
WATER
REFRIGERATION
May 2000
Page 15
CME1356 and CME1656
Initial Start Up
1. Remove the front panel.
2. Locate the AutoIQ Controller.
3. Switch on the electrical power. The controller’s
indicator lights all flashed on briefly. Blue
controllers also begin to flash their red lights and
the Freeze light will be on. After 20 seconds the
red lights stop flashing, the Freeze light goes out,
the Bin Full and Off lights switch on and then the
Bin Full light goes out. The Off light will be glowing.
4. Open the water supply valve.
5. Push and release the Freeze switch (the Freeze
indicator light blinks until the compressor starts).
Initial Start
The Freeze light will begin to blink.
·
The Hot Gas Solenoid valve will be open.
·
The Purge valve will be open.
·
The Water pump is on.
·
The hot gas and purge valves close and the
·
inlet water valve opens to fill the reservoir and
shuts off when the reservoir is full.
The compressor starts.
·
Freeze Cycle:
·
The Freeze indicator light will be on. The
machine will stay in a Freeze cycle for many
minutes.
·
The pump will stop for a few seconds a few
minutes into the freeze cycle.
·
The fan motor (of air cooled models) will begin
to turn and soon warm air will be forced out the
back of the cabinet.
·
The freeze cycle will continue until the water
level in the reservoir drops to its factory set
point; the first time that happens in the freeze
cycle will cause the controller to open the inlet
water valve to refill the reservoir, the second
time in the freeze cycle that this set point is
reached 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 water pump will stop. It will restart in less
than 74 seconds.
·
The purge valve closes and the Inlet water
valve will open for a short time to add water.
The Bin Full indicator light will go on and off as
·
ice falls from the evaporators.
6. Machines are shipped from the factory with the
purge level set to accommodate average water
conditions. To achieve optimal machine
performance, set the purge level to the minimum
setting.
Note: While the amount of water purge is
adjustable, only those installations with a water
supply known to be excellent (very low TDS)
should adjust to the minimum setting. See page 18
for purge adjustment instructions.
7. The machine’s correct
ice falling from the evaporator in vertical strips of 8
- 10 cubes; the top 2 cubes might fall individually.
8. After about 6 minutes the machine will return to
a freeze cycle.
Note: After the first harvest, the controller will
adjust harvest time as needed to release all ice.
9. The water valve will re-fill the reservoir at the
beginning of freeze.
10. Collect and discard the first batch of ice. Rinse
out the bin.
11. Fill out the Customer Evaluation and Warranty
Registration. Send it to Scotsman.
12. Replace the left front panel.
13. Inform the user of the location and telephone
number of the local service company. Also inform
the user of the required maintenance of the
machine.
Notes On Operation:
1. The bin control signals the ice machine to shut
off whenever the bin becomes full, but the machine
will not stop until it has finished the next harvest
cycle. This last harvest cycle will be longer than
the rest.
2. After the bin has filled the unit will not be able to
restart for 4 minutes. However, if needed, the
Freeze button may be pushed to restart the unit.
For example: If ice is removed from the bin
immediately after the machine has filled up and
shut off, the Bin Full light will be ON and the
machine will not restart for 4 minutes.
3. If the bin controls sense a bin full signal before
any water is used (float stem up), the machine will
shut off on bin full
cube size should result in
March 2003
Page 16
Adjustments
If there was a problem during Initial Start Up:
If an error light came on, check the following.
1. Water error.
A water error could have been determined by the
AutoIQ Controller if the inlet water valve does not
fill the reservoir, or if the water pump does not start
and lower the water level.
2. Refrigeration error.
A refrigeration error could have been determined
by the AutoIQ Controller if the water temperature
did not drop during the freeze cycle. The controller
will next check the compressor discharge
temperature, If the discharge temperature is too
low, the refrigerant error light will be switched on,
and the machine will Shut Down.
Note: Reset and restart the machine by
pushing and releasing the Off push button
switch, and then pushing and releasing the
freeze push button switch.
CME1356 and CME1656
Splash Panel Positioning: It is critical that the
lower splash panel be properly positioned. If
removed during installation or start up, check that
it has been properlyreturned to its original position.
Insert Bottom Tabs in 5th
Slot of Cube Deflectors
Insert Into Slot
Lower Inner
Splash Panel
Lower Splash Panel Positioning
May 2000
Page 17
CME1356 and CME1656
Adjustments
How to adjust the water cooled discharge
pressure
Water cooled models use a water regulating valve
to control how much cooling water flows thru the
water cooled condenser. At the top of that valve,
located in the back of the ice machine, is an
adjustment stem.
To Adjust:
1. Attach a refrigeration manifold gage to the
discharge access valve.
2. While the unit is in the freeze cycle, determine
the discharge pressure, it should be about 245
PSIG.
3. If needed, rotate the adjustment stem to
increase or decrease the pressure:
A. To increase discharge pressure (reduce water
flow) rotate the stem counter-clockwise.
B. To decrease the discharge pressure (increase
water flow) rotate the stem clockwise.
Remove the manifold when done. Note: The water
outlet temperature should be between 100-110
when the valve is properly set.
Thermostatic Expansion Valve:
The TXV is not adjustable, do not attempt to adjust
it.
How to Adjust the Amount of Water Purge
Adjustment is done by use of the control buttons on
the AutoIQ Controller. Examine the next section to
become familiar with the AutoIQ Controller before
beginning.
1. If the machine is on, push and hold the OFF
button for more than 3 seconds, then release it.
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 for extreme water conditions. Note:
This setting may extend the Harvest cycle
and reduce capacity.
• 2. Heavy Purge is when these 4 lights are
Freeze, Harvest, Clean, Off. Use for
ON:
severe water conditions.
• 3. Standard Purge (factory setting) is when
these 3 lights are ON:
Use for moderate to severe water conditions.
Harvest, Clean, Off.
• 4. Moderate Purge is when these 2 lights are
Clean, Off. This is for typical water
ON:
conditions.
• 5. Minimum Purge is when this light is ON:
Off. For excellent water conditions.
Adjust by pushing and releasing the Freeze button.
Pushing and releasing the Freeze button increases
the purge one level up to the maximum, then it goes
to the minimum.
Typical Ice Level When Unit Shuts Off
4. The machine will automatically restart after 60
seconds of no switch inputs, or restart the machine
by pushing in and holding the Off button for more
than 3 seconds, then releasing it. The unit will then
be Off. From there the machine may be placed in a
freeze cycle by pushing and releasing the Freeze
button.
May 2000
Page 18
How To Operate The AutoIQ Controller
The AutoIQ Controller is a
microprocessor based device
that receives input from several
sources and switches various
components on and off.
Its manual control is thru the use
of the Push Button Control
Switches
CME1356 and CME1656
1. Freeze Button. Pushing and
releasing this button starts or
restarts the machine. The AutoIQ
Controller remembers what cycle
it was last in and returns to that
cycle.
2. Harvest Button: Pushing and
releasing this button will cause
the machine to go directly to a
Harvest Cycle. Can be done from
Freeze or Off. The machine will
switch Off at the end of the
Harvest cycle.
3. 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 button will switch
the machine OFF at the end of
the next cycle. If the button is
pushed and HELD for more than
3 seconds, the unit will switch off
immediately.
7
6
5
4
3
2
1
89
PUSH BUTTON
CONTROL SWITCHES
INDICATOR LIGHTS:
BIN FULL
FREEZE
HARVEST
CLEAN
OFF
DIAGNOSTIC LIGHTS:
WATER
REFRIGERATION
To Reset Machine (machine
off, error light on): First push
and release the Off button, then
push and release the Freeze button.
May 2000
Page 19
CME1356 and CME1656
How The Electronic Cuber Works
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
water level, and switches the sensor on and off as
it moves.
4. Bin fill level. A thermostat signals to the
controller if ice is needed or not, based on the
temperature at the thermostat’s sensing bulb.
5. Time. The controller measures and compares
how long it takes for various events to happen. It
stores that data for future reference.
Controller Outputs:
A. 24 volt:
• 1. Lights
• 2. Inlet water valve
• 3. Hot Gas Valve
• 4. Contactor Coil
B. High Voltage
• 1. Water Pump
• 2. Purge Valve
• 3. Air cooled Fan Motor
May 2000
Page 20
How The Electronic Cuber Works
CME1356 and CME1656
This section is intended for the technician. It is not
necessary for the normal operation and
maintenance of the machine.
The AutoIQ Controller operates the ice machine by
monitoring several input measures and switching
various loads on and off.
Water System:
Water flows into the ice machine during the
harvest cycle thru the inlet water valve. The water
valve will NOT be open the complete length of the
harvest cycle. The water pump forces water to the
top of the evaporators, both in the Freeze and
Harvest cycles. Un-frozen water falls thru the cube
deflector and back into the reservoir. As water is
turned into ice, the water level in the reservoir falls,
and at the point where the cubes are fully formed,
the Water Level Sensor indicates to the AutoIQ
Controller that it is time to begin the Harvest cycle.
During the Harvest cycle, water again enters the
water reservoir, and a purge valve opens to drain
the reservoir and dilute the concentration of
accumulated minerals. The purge valve is opened
for a fixed amount of time, but the water pump
does not start right away, but at a time determined
by the AutoIQ Controller’s purge setting. The
higher the purge setting,
the sooner the water pump
will start, and more water
will be drained out.
Hot Gas Valve
Refrigeration System:
The refrigeration system is similar to that of most
commercial cube ice machines. Heat is removed
from the water and discharged out the condenser
during the freeze cycle. As liquid refrigerant passes
thru the Thermostatic Expansion Valve, it enters the
bottom of the evaporators, and will form on the
bottom first. When cubes need to be released
(Harvest) the Hot Gas Valve is opened and hot
discharge gas flows directly from the compressor to
the evaporator inlets. This warms up the
evaporators and the surface of the ice frozen to the
evaporator surface melts. Ice then falls into the bin.
Evaporators
Water Pump
May 2000
Page 21
Cube
Deflector
Cube Port
Inlet Water Valve
Purge Valve
Reservoir
Water Level
Sensor
CME1356 and CME1656
Technicians Only: Freeze Cycle Operational Sequence
Assuming the machine has been operational, the
Freeze cycle begins with the end of the Harvest
Cycle:
• Condenser fan is OFF
• Water Inlet Valve is CLOSED
• Water Pump may be ON
• Compressor is ON
• Hot Gas Valve is OPEN
AutoIQ Controller Operation, Beginning freeze:
1. Switches on the Freeze indicator light and shuts
off the hot gas valve.
2. Opens the water valve to top off the reservoir.
Water must fill the reservoir within 250 seconds or
the controller shuts the machine down. It will
automatically try to restart in 20 minutes.
3. Measures the discharge temperature.
4. Starts the fan motor (air cooled only). The
Controller checks the discharge temperature and
cycles the fan every on for 30 seconds and off for
20 seconds if the temperature is low.
If the discharge temperature exceeds the design
maximum, shuts the machine down on a
Refrigeration Error.
restarts, the inlet water valve opens to refill the
reservoir.
8. As the machine makes ice, the water level in the
reservoir will ultimately fall to the Harvest Level .
The first time that happens during a freeze cycle
prompts the controller to re-fill the reservoir. The
next time it happens, the unit will begin to go into a
harvest cycle.
Air cooled models will switch off the fan motor a few
seconds before harvest begins.
Note: If the freeze cycle exceeds the preset
Maximum (36 minutes), the AutoIQ Controller will
Shut Down on a Refrigeration Error.
9. At the end of Freeze cycle:
• Water level = below harvest position
• Condenser fan will be off
• Water inlet valve will be off
• Water pump will be ON
• Compressor will be ON
• Hot gas valve will be off
At this point Harvest begins and the AutoIQ
Controller switches the Harvest indicator light ON.
Restarts:
5. Checks for a “bin full" signal throughout the
cycle.
6. Measures the reservoir water temperature. If the
machine is operating correctly, the reservoir water
temperature will fall at a standard rate. The AutoIQ
Controller will be checking to see if the water
temperature fall matches that rate.
If not, it re-checks the discharge line temperature.
If too low, it Shuts Down on a Refrigeration Error.
If the discharge temperature is acceptable, the
water system is checked by shutting off the water
pump and determining if the water level goes up
enough. If it does not, it is assumed that there is a
water pump problem and the machine Shuts Down
on a Water Error.
If the water level does “measure up" the water
pump is restarted and the AutoIQ 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 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. After the pump
If restarting after shutting off because the bin was
full, the first freeze cycle sequence is like this:
1. Purge valve is open.
2. Pump starts.
3. Purge valve closes.
4. Water valve opens to fill the reservoir.
5. Compressor starts.
Note: If there is a power interruption, after power is
restored the machine will restart, go thru a brief
Freeze cycle and then go thru a 6 minute Harvest
cycle. The Freeze light will be blinking - even when
the machine is in harvest.
Error Restarts:
The machine automatically attempts to restart 50
minutes after a shut down. If another problem
occurs in the next cycle, the machine will attempt
one more restart. If another problem occurs in the
next cycle, the machine will be off and must be
manually reset.
May 2000
Page 22
CME1356 and CME1656
Technicians Only: Harvest Cycle Operational Sequence
Harvest
The (air cooled model) fan is off.
The purge valve opens, and will remain open for
74 seconds.
The water pump shuts off, it will restart in less than
74 seconds, depending upon the Purge Level set.
The water pump restarts and pumps out water thru
the open purge valve until the valve closes.
The inlet water valve then opens for about 30
seconds to add some water.
During the Harvest Cycle, ice will be falling from
the evaporators and between the ice sensor’s
electric eyes. The AutoIQ Controller monitors the
ice falling and stays in the Harvest Cycle until ice
quits going thru the electric eyes.
The maximum harvest time is 14 minutes. The first
Harvest after a restart will be a long one to
establish a base line, then the actual time it took to
release the ice is used to determine the length of
the next harvest cycle.
If no cubes fall (or are sensed) by the end of
Maximum Harvest Time, the machine senses a
refrigeration error. If the next cycle also produces
a refrigeration error, the machine Shuts Down.
Note: The last harvest cycle before shutting off on
bin full is 6 minutes long.
The machine will not restart for 4 minutes after
switching off on Bin Full, unless the freeze button
is pressed.
Note: If during a Bin Full shut down, the machine
has not restarted for 12 hours, the compressor will
run for 30 seconds to clear the oil of refrigerant.
Continuous Run Time:
A unit that operates 24 hours a day 7 days a week
is too small for the user’s needs. To maintain
harvest integrity, the controller will extend the
harvest time to 6 minutes minimum every 15th
consecutive harvest cycle.
If the bottom unit is in harvest and receives a signal
from the top unit that it is also in Harvest, the
bottom unit will stay in harvest for about 6 minutes.
If the bottom unit is shut off, but its controller still
has power, the top unit may continue to operate. If
the bottom unit’s power is shut off, the top unit will
shut down on bin full at the end of the next cycle. If
the top unit’s power is shut off, it does not impact
the lower unit.
An error shut down on one unit does not affect the
other. Either may be switched off at the controller.
Diagnostic Lights and Manual Resets
The controller will shut the machine off if a
malfunction is sensed. The Controller will restart the
machine 2 times, with a 50 minute interval between
restarts. If a malfunction is still present after the
second restart, the machine will then shut off and
must be manually reset. During the restart interval,
the machine will be off and a diagnostic code
indicated.
The exception to this is lack of water. The machine
will always try to re-fill the reservoir every 20
minutes.
Diagnostic Code Table
If a Diagnostic
Light
Blinks once and
repeats
Blinks twice and
repeats
Blinks three
times and
repeats
Is ON all the
time
Both On all the
time
Water Light
Water pump did
not start
Lack of water fill No harvest of ice
not used
Water valve
leaking thru
rapidly
Check for thermistor set unplugged
or failed
Refrigeration
Light
Very long ice
harvest
High Discharge
Temperature
Check for low
discharge
temperature or
long freeze cycle
Bin Thermostat (for those units so equipped):
In normal ambients the thermostat will react to ice
on the bulb in a few seconds. Reaction after
removal will take about a minute under normal
conditions, and longer in colder rooms.
Stacked Units:
May 2000
Page 23
CME1356 and CME1656
Sanitation and Cleaning
It is the User’s responsibility to keep the ice machine and ice storage bin in a sanitary condition. Without
human intervention, sanitation will not be maintained. Ice machines also require occasional cleaning of
their water systems with a specifically designed chemical. This chemical dissolves mineral build up that
forms during the ice making process.
Sanitize the ice storage bin as frequently as local health codes require, and every time the ice machine is
cleaned and sanitized.
The ice machine’s water system should be cleaned and sanitized a minimum of twice per year.
In Place Cleaning of the Ice Machine Water System:
1. Remove all ice from the bin.
2. Remove the front panels.
3. Push and release the Harvest button (this
releases any ice that may be on the evaporators and
warms them up).
4. Wait for the machine to finish the Harvest cycle
(the machine will stop).
5. Remove the the insulated plastic evaporator
cover, the two inner splash panels (part number
02-3680-01 and the one above it), both cube
deflectors, and the ice sensors. Place the splash
panels and the cube deflectors in a separate
container. Place the ice sensors in the reservoir, but
be sure that the ends of the connecting wires are not
in the water.
6. Push and release the Clean button. The Clean
indicator light will be blinking, and the pump will
restart.
7. Pour 24 ounces of Scotsman Ice Machine Cleaner
into the reservoir water. Return the evaporator cover
to its normal position.
8. Mix a solution of 8 ounces of Scotsman ice
machine cleaner and 1 gallon of warm (95-115
water. Use the solution to scrub the splash panels
and cube deflectors in the separate container.
Scotsman Ice Machine
Cleaner contains acids.
Acids may cause burns.
If concentrated cleaner
comes in contact with
skin, flush with water.
If swallowed, do NOT
induce vomiting. Give
large amounts of water or
Milk. Call Physician
immediately. Keep out of
the reach of children.
o
F.)
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 or go
to step 19 to finish the cleaning process.
12. Mix 2 gallons of Sanitizer solution. Follow local
codes for Sanitizer.
Note: A possible sanitizing solution may be made by
mixing 1 ounce of liquid household bleach with 2
gallons of warm (95-115
13. Push and release the Clean button again.
14. Pour 24 ounces of Sanitizer solution into the
reservoir water.
15. After the solution has circulated for 10 minutes
push and release the Clean button. This starts the
rinse process. Sanitize the ice storage bin while
waiting.
16. Continue the rinsing process for 20 minutes, then
push the off button to switch the machine off.
17. Remove the evaporator cover and spray or wash
all interior surfaces of the freezing compartment
including the evaporator cover with sanitizer solution.
18. Thoroughly immerse the splash panels and cube
deflectors in the sanitizing solution.
19. Return the ice sensors, splash panels and cube
deflectors to their original positions.
20. Return the evaporator cover to its original position.
Push and release the Freeze button.
21. Return the front panels to their normal positions
and secure them to the machine with the original
screws.
o
F.) potable water.
May 2000
Page 24
Additional Maintenance
CME1356 and CME1656
To drain reservoir completely (if desired):
1. Remove front panel.
2. Push and hold the Off button.
3. Push and hold the Clean button for 3 seconds to
activate the purge valve.
4. Push and release Freeze button.
5. Replace front panel.
To Sanitize the Ice Storage Bin
1. Remove all ice.
2. Remove baffle.
3. Switch ice machine OFF or wait for it to be in a
cleaning cycle.
o
4. Mix a 1 gallon solution of warm (95-115
and sanitizer. Follow local codes for sanitizer.
5. Wash or spray the entire interior of the ice
storage bin with the sanitizer solution. This includes
the bottom of the ice machine and the inside of the
door, the door gaskets (if any) and door frame.
6. Pour excess sanitizer into the bin to flush the
drain system.
7. If the approved sanitizer requires a rinse, rinse all
interior surfaces with potable water.
F.) water
May 2000
Page 25
CME1356 and CME1656
Additional Maintenance: Water Distributors
It may become necessary to remove the water
distributors from the top of the evaporator and
clean (de-mineralize) them outside of the ice
machine.
1. Remove front panes.
2. Push and release the OFF button.
3. Remove the evaporator covers.
4. Pull the tab at the front of the evaporators
forward and lift the front of the water distributors
up until they clear the tab.
Water
Distributors
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 potable water.
10. Return the water distributors to their normal
installed position.
11. Return the two inner splash panels and the
evaporator cover to their original positions.
Check That Water
Channels Are Clear
Remove Distributors as a Set
5. Repeat for all evaporators and distributors.
6. Pull the distributors forward as a set.
Manifold
Pull Manifold Out
7. Remove the distributors from the manifolds.
8. Examine the top of the evaporators. 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.
12. Push and release the clean button to flush the
water system.
Insert Bottom Tabs in 5th
Slot of Cube Deflectors
13. After the machine stops, push and release the
Freeze button.
14. Replace the front panel.
May 2000
Page 26
Additional Maintenance: Inlet Water Valve Screen
CME1356 and CME1656
The inlet water valve has a screen on its inlet side
to keep debris from flowing into the valve. In some
cases, this screen may become clogged or
restricted by debris build up. Check for the proper
water flow:
Flow rate is 2.7 G.P.M.
1. Remove left front panel.
2. Obtain a measuring cup and a watch.
3. Pull the water discharge tube out of the
reservoir and place it in the cup.
4. Push and release the Harvest button.
5. If working properly, the water valve will fill a 16
oz cup in about 3 seconds. Be prepared to push
the Off button. If it does not, the water valve inlet
or other water device is restricted.
To Check the Inlet Water Valve Screen.
1. Disconnect the electrical power.
2. Shut off the water supply.
Air Filter Replacement
1. Remove the left front panel.
2. Remove a screw holding one clip to the front
panel.
3. Replace the air filter.
Note: Filter size is 20 x 20 x 1. Use a like
replacement, equal to UL class 2, 377A.
4. Return the front panel to its original position.
Secure it to the cabinet.
3. Remove the left front panel.
4. Unplug the electrical connection of the inlet
water valve.
5. Remove the screws holding the inlet water valve
to the cabinet.
6. Remove outlet tube from inlet water valve.
7. Rotate inlet water valve from inlet fitting and
remove valve from machine.
8. Examine the inlet screen, if dirty, brush off
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.
May 2000
Page 27
CME1356 and CME1656
Additional Maintenance: Ice Sensors, Condenser
The ice sensors use a system of infrared emitting
and receiving components to sense ice. They are
located at the bottom of the ice outlet port. They
must be free of mineral build up to function
properly. To check:
1. Remove front panels.
2. Push and release the off button.
3. Remove the evaporator cover.
4. Remove the lower splash panel.
5. Push the front sensor back and out of its holder.
6. Pull the back sensor forward and into the cube
port.
7. Examine the bottom of the brackets, there are
two sensors in each bracket, 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. Be sure to drain the reservoir or go
thru a Clean cycle to remove residual cleaner.
Note: Do NOT use abrasive materials or cleaner
on the bin sensor lenses. A soft toothbrush is an
effective tool for cleaning these sensors.
To Clean the Air Cooled Condenser
1. Remove the front panel.
2. Push and release the Off button.
3. Remove the top panel.
4. Remove the left side panel.
5. Clean or replace the air filter.
6. Check the fan blade and condenser for grease or
dust build up.
Because air flow is from the inside of the cabinet
out, the inside of the condenser fins will have the
most build up.
A. Place the inlet hose of a vacuum cleaner in the
condenser shroud.
B. While the vacuum cleaner is on, blow
compressed air from the back of the condenser thru
the fins.
C. If grease is present, use coil cleaner on the
condenser. Be sure to wipe up any excess coil
cleaner.
7. Additional access can be gained by removing the
top of the fan shroud.
Upper Half of Fan
Shroud
Remove
4 Screws
to
Remove
Upper
Half
Insert Bottom Tabs in 5th
Slot of Cube Deflectors
8. Reverse to reassemble.
8. After cleaning, return all panels except the right
front to their original positions.
9. Push and release the Freeze button.
10. Replace the front panel.
May 2000
Page 28
CME1356 and CME1656
Service Diagnosis: Controller Diagnostic Light Analysis
Problem or Symptom Possible Cause Probable Correction
Machine is off Bin is full, ice in cube port Use some ice
Power is off, check lights. If all lights are out, check power supply,
restore power if off
Bin thermostat is closed Check thermostat for ice on the bulb. If none,
check adjustment.
Transformer is open If all lights are out and there is power, check
transformer output for 24 vac
Unit is off & Water
diagnostic light is ON
or BLINKING
Unit is off &
Refrigeration
diagnostic light is ON
or BLINKING
Unit has been switched off
Off lite is glowing
Compressor will not start Not enough water or water not sensed.
Unit has Shut Down Check for Refrigeration or Water Error
Water inlet valve
malfunction
Water pump malfunction Check that pump hose is attached and if
Water level not sensed or
not high enough
Low discharge or long
freeze cycle
Harvest problem If the Refrigeration light blinks once and
High Discharge Temp If the refrigeration diagnostic light blinks 3
Push and release Freeze button to restart unit.
Check water diagnostic light, if it blinks 2
times and repeats, check the water inlet valve
for proper water flow.**
pump is plugged in and working.
Check harness from sensor.
If the Refrigeration light is glowing steadily,
there is a probable refrigeration problem
repeats, look for a harvest problem.** This
also indicates that cubes were “sensed” by
the bin controls.
If the lite blinks 2 times and repeats, check for
a harvest error - no cubes sensed.
times and then repeats, check for a reason for
high discharge temperatures.
Unit does not go into
harvest - exceeds
maximum freeze time
Exceeds maximum harvest
time
Unit runs and both
Diagnostic lites are ON
Same, but 1 light is on Reservoir temp. wrong Reset and check water temp and sensor.
* Machine may be reset by pushing and releasing the Off button, then pushing and releasing the Freeze
button. ** See following pages
Temperature sensors out
of range
May 2000
Page 29
Push and release Off button. Push and
release Freeze button. Check operation.
Push cube size float down and check
operation.
Check for cause of long harvest cycle**
Replace the temperature sensor set (water
and discharge).
CME1356 and CME1656
Service Diagnosis
Problem or Symptom Possible Cause Probable Correction
Unit is off because of
a “Harvest Problem”
Cubes are too large Cube size control float is
Cubes are too small Purge valve leaks thru Check purge valve
Low ice capacity Dirty condenser or filter Replace filters, clean condenser
Bin controls did not sense
ice falling, unit stayed in
harvest until the maximum
harvest time ran out.
Bin controls or AutoIQ
Controller may have failed.
Other components may
have failed
sticking.
Inlet water valve leaks thru Check water valve
Not enough water Check for leak in reservoir
Recirculation of air Block air re-circulation or move condenser
Low refrigerant charge Check system. If there is a low charge, find the
Check bin controls. The bin full light should be
off. If it is on or blinking the bin controls may be
dirty. Clean if dirty. The board and bin controls
may also need to be checked.
Push and release Off button. Push and release
Freeze button. Check machine operation.
Check if ice is made and harvests.
See “Unit does not shut off” below.
Check the next page
Check/clean
leak, recover the refrigerant, repair the leak,
replace the dryer, evacuate and weigh in the
nameplate charge.
Unit does not shut off
or cannot sense ice
falling
Too much water Check for inlet water valve leak thru
Ice sensor system may
have failed.
Check ice sensors. Check bin full light, if off,
place something between the electric eyes.
The bin full light should begin to blink (after 20
seconds of continuous blockage it will glow
steadily). If not, check operation of electric eyes
by unplugging #4 and jumping out the two pins
on the controller (first discharge any static
electricity by touching the cabinet with the tool).
If the bin full light blinks, replace the bin
controls. If it does not blink, replace the
controller. Note: Leaving #4 unplugged and
jumped for 20 seconds will shut the machine
down on a bin full (at the end of the harvest
cycle). It will restart after 4 minutes or may be
reset by pushing the Freeze button.
May 2000
Page 30
CME1356 and CME1656
Service Diagnosis: Components
Problem or Symptom Possible Cause Probable Correction
Fan motor does not
turn. Refrigeration
light may be on
steadily or blinks 3
times and repeats.
Pump motor does not
turn
Hot Gas Valve does
not open.
Hot Gas Valve leaks
thru (warm tube
temperatures on both
sides of valve during
freeze)
Open motor windings, or
seized bearings
No power to fan motor Fan motor unplugged, check for voltage from
Open motor windings, or
seized bearings
No power to pump Check electrical connections. If the unit is in
Open solenoid coil. Replace hot gas valve
Stuck valve Replace hot gas valve
No power to coil in Harvest Check wire connections, if ok, replace AutoIQ
Mechanical problem in
valve
Replace fan motor
controller. If none, replace controller.
Replace pump
Freeze the pump should have power to it. If
not, replace the AutoIQ Controller.
Controller
Replace valve
Water Inlet Valve
does not open
Water Inlet Valve
does not flow enough
water
Water Inlet Valve
leaks thru
Compressor does not
work
Open solenoid coil Replace valve
Stuck valve Replace valve
No power to valve (early
part of harvest)
Restriction in water supply Check water filters and/or inlet screen.
Mechanical problem in
valve
Unit in Clean cycle Push and release Freeze button.
Contactor coil open Replace contactor
Open starting components Check and replace
Open windings Check and replace compressor
Internal valve failure Replace compressor
Water level too low or not
sensed
Check wire connections, if ok, replace AutoIQ
Controller
Replace valve
Unit must be full of water before controller will
start compressor. Check water level and
sensor and harness.
May 2000
Page 31
CME1356 and CME1656
PTCR
The “D” series cubers use a PTCR (Positive
Temperature Coefficient Resistor) in place of a
conventional start relay and start capacitor.
Power from the contactor connects to the PTCR and
to the Run Capacitor
A wire connects the other terminal of the PTCR to
the compressor’s start winding.
Another wire connects the run capacitor to the start
winding.
A parallel circuit connects power from the contactor
to the Run winding of the compressor.
A PTCR changes resistance sharply when its
temperature changes. When the PTCR is cold, it
connects full current to the compressor’s start
winding. After a very short time, the PTCR heats up
and shuts off the current flow. Under normal
conditions, the PTCR’s case is at about 180oF.
At that temperature the PTCR has very high
resistance and will not allow current to flow. It must
cool down to about 120oF. Before current will pas
through it again.
Diagnosis:
1. Disconnect electrical power.
2. Check if the PTCR is cool enough to handle
safely. If not, wait 5 minutes for it to cool off.
3. Disconnect both leads to the PTCR and measure
its resistance with an ohmmeter. If the PTCR reads
less than 21 ohms or more than 39 ohms, replace
May 2000
Page 32
CME1356 and CME1656
Operational Characteristics: CME1356
Cycle Times (minutes):
Air Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Freeze 12 - 13 17 - 19
Harvest 2 ½ - 3 2
Water Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Freeze 13 - 14 15 - 16
Harvest 2 ½ - 3 2 ½ - 3
System Pressures (PSIG):
Air Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Suction: End of Freeze 27 - 29 31 - 33
Suction: Peak in Harvest 82 - 84 92 - 94
Discharge: 5 minutes into Freeze 215 - 225 285 - 295
Discharge: Minimum in Harvest 165 - 175 165 - 175
Water Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Suction: End of Freeze 28 - 30 29 - 31
Suction: Peak in Harvest 81 - 83 93 - 95
Discharge: 245 245
Refrigerant Charge, R-404A
• Air cooled: 64 ounces
• Water cooled: 62 ounces (A thru E series)
• Water cooled: 58 ounces (F series)
Typical Air Cooled Machine Amps
Single Phase
• 5 minutes into Freeze: 17
• Harvest: 13
Three phase
• 5 minutes into Freeze 9.5
Typical Harvest Ice Weight
• 16 lb
Superheat (near the end of freeze)
• The TXV will control a nominal superheat
point that can vary unit to unit from 11
o
F. While controlling that point the
17
superheat can also range + or - 4
affecting performance.
Water Cooled:
• Discharge Pressure: 245 PSIG
• Hi Pressure Cuts Out at: 450 PSIG
• Harvest 8.5
o
F. to
o
F. without
June 2002
Page 33
CME1356 and CME1656
Operational Characteristics: CME1656
Cycle Times (minutes):
Air Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Freeze 15 - 17 18 - 20
Harvest 3 2 ½
Water Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Freeze 14 - 16 16 - 17
Harvest 2 ½ 2 ½
System Pressures (PSIG):
Air Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Suction: End of Freeze 21 - 23 34 - 36
Suction: Peak in Harvest 88 - 92 101 - 105
Discharge: 5 minutes into Freeze 210 - 220 285 - 295
Discharge: Minimum in Harvest 115 - 125 165 - 175
Water Cooled 70oF. indoor air, 50oF. water 90oF. indoor air, 70oF. water
Suction: End of Freeze 31 - 34 31 - 34
Suction: Peak in Harvest 75 - 85 80 - 90
Discharge: 245 245
Refrigerant Charge, R-404A
• Air cooled: 64 ounces
• Water cooled: 62 ounces (A thru E series)
• Water cooled: 58 ounces (F series)
Typical Air Cooled Machine Amps
Single Phase
• 5 minutes into freeze: 17
• Harvest: 15.5
Three Phase
• 5 minutes into freeze: 11
Typical Harvest Ice Weight
• 19.2 lb
Superheat (near the end of freeze)
• The TXV will control a nominal superheat
point that can vary unit to unit from 11
o
F. While controlling that point the
17
superheat can also range + or - 4
affecting performance.
Water Cooled:
• Discharge Pressure: 245 PSIG
• Hi Pressure Cuts Out at: 450 PSIG
• Harvest: 9
o
F. to
o
F. without
June 2002
Page 34
Removal and Replacement
CME1356 and CME1656
Water Pump
Electrical Shock Hazard
Disconnect electrical
power before beginning
service
Disconnect the electrical power.
2. Remove the left front panel.
3. Check that controller lights are out.
4. Unplug water pump from its electrical
connection.
5. Remove 1 plastic bolt and the reservoir cover.
6. Lift water pump up and disconnect outlet tube.
7. Pull float ball from float stem (it is a snap fit).
Pull stem out.
Inlet Water Valve
1. Remove the left front panel.
1.
2. Shut off the water supply.
3. Push and release the OFF button.
4. Pull the wire harness off the inlet water valve.
5. Remove screws holding the inlet water valve to
the cabinet.
6. Pull the valve away from the cabinet and
disconnect the outlet tube.
7. Unscrew the water valve from the water inlet
tubing.
8. Reverse to reassemble.
9. Push and release the Freeze button
10. Return the left front panel to its original position
and secure it to the cabinet.
8. Locate water level sensor mounting tabs,
compress together to release sensor from bracket.
9. Remove water pump brackets from pump.
10. Reverse to replace.
11. Replace front panel.
12. Re-connect electrical power.
May 2000
Page 35
CME1356 and CME1656
Removal and Replacement: AutoIQ Controller
Electric Eyes (Harvest Control Sensors)
Electrical Shock Hazard
Disconnect electrical
power before beginning
service
1. Disconnect the electrical power.
2. Remove the front panel.
3. Remove mounting screw holding controller to
cabinet.
4. Touch a metal surface to discharge any static
electricity.
5. Pull controller out slightly and unplug all
electrical connections.
Note: Do NOT touch the back of the controller.
6. Carefully remove the new controller from its
packaging. Again, do NOT touch the back of the
controller.
These must be replaced as a set.
1. Remove front panels.
2. Push and release the Off button.
3. Remove evaporator cover.
4. Remove both splash covers.
5. Reach into cube port area and pull the back
sensor forward until the harness connector is
available, then unplug it and remove the sensor
from the cabinet.
Back Sensor
7. Plug all electrical connectors into the new
controller.
8. Re-attach the controller to the cabinet.
9. Switch on the electrical power. All lights should
lite up.
10. Push and release the Freeze button.
11. Replace the front panel.
89
7
PUSH BUTTON
6
5
4
3
2
1
CONTROL SWITCHES
INDICATOR LIGHTS:
BIN FULL
FREEZE
HARVEST
CLEAN
OFF
DIAGNOSTIC LIGHTS:
WATER
REFRIGERATION
Front Sensor
and Holder
6. Push front sensor back into the cube port. When
it is free of the sensor holder, twist it 90 degrees
and pull it up and out of the cube port.
7. Trace wire back to the controller and unplug.
8. Reverse all steps to reassemble.
May 2000
Page 36
Removal and Replacement: Water Level Sensor
CME1356 and CME1656
1. Remove front panel.
2. Push and hold the OFF button. Release it when
the machine stops.
3. Trace wire harness from water level sensor to
the AutoIQ Controller (#2). Unplug the harness
from the controller.
4. Lift the pump and mounting plate up enough to
remove the float from the stem.
5. Remove two screws holding the sensor to the
pump bracket and lift the sensor up and out of the
machine.
6. Reverse to reassemble.
Float Stem
1. Remove the left front panel.
2. Remove the reservoir cover.
3. Pull up on float stem, reach under pump cover
and pull the float off the stem.
4. Pull stem out and reverse to replace.
Note: Replacement float stem depths are factory
set, but confirm them before installing the new
stem:
CME1356 uses a tan float stem
CME1656 uses a brown float stem
Water Temperature Sensor
Note: This sensor is replaced as a set with the
Discharge Temperature Sensor.
1. Remove left front panel.
2. Push and release Off button.
3. Remove 1 plastic bolt and the reservoir cover.
4. Locate water temperature sensor (inserted into
pump discharge hose).
5. Pull out to remove.
6. Trace back to AutoIQ Controller, unplug from #5.
7. Remove the Discharge Line temperature sensor
(see the next page).
8. Reverse to reassemble.
Purge Valve Timer
The purge valve timer is sensitive to electrostatic
discharge. Be certain to touch a grounded surface
before touching this component. Do the same when
handling the replacement part.
1. Touch a grounded surface.
2. Remove left front panel.
3. Disconnect electrical power.
Observe machine for proper cube size after
replacement of the float stem.
Electrical Shock Hazard
Disconnect electrical
power before beginning
service
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.
May 2000
Page 37
CME1356 and CME1656
Removal and Replacement: Fan Blade and/or Fan Motor
1. Disconnect electrical power.
Electrical Shock Hazard
Disconnect electrical
power before beginning
service
2. Remove left front and top panels.
If stacked, removal is possible thru the front only.
Shut off the water and disconnect the inlet water
line from the solenoid valve. Move it up and out of
the way. Also remove the water pump to get better
access to the fan motor. Skip steps 3 and 4.
3. Remove the 4 screws holding the top part of the
fan shroud to the bottom fan shroud.
4. Tip the top of the fan shroud forward and pull it
up and out of the cabinet.
5. Note location of fan blade on shaft and loosen
fan blade set screw.
Note: If the transformer is not supplying power,
check the AutoIQ Controller for blacking at the top
connections. If the connections appear to have
blacked, replace the AutoIQ Controller before the
transformer is replaced.
Discharge Line Temperature Sensor
1. Remove left front panel, push and release the Off
button.
2. Remove top and left side panels.
3. Locate discharge line sensor. It is attached to the
discharge line of the compressor, 6" from the
compressor discharge port.
4. Unwrap the insulation and un-snap the clip
holding the sensor to the discharge line.
5. Trace the sensor wires back to the controller,
they are plugged into #5 with the water temperature
sensor, and must be replaced with it.
6. Reverse to replace, be sure that the discharge
line sensor is 6" up from the compressor discharge
port. Be sure to re-wrap the insulation.
6. Remove the four bolts holding the fan motor to
the bracket.
7. Tip fan motor and blade up, move fan blade as
needed to clear internal parts.
8. Replace the blade or motor as needed.
Note: The fan is properly on the motor shaft when
the hub faces the motor and the shaft end is ½ “
from the fan blade.
Transformer and Compressor Starting
Components
Single phase compressors use a start relay, start
capacitor and run capacitor. All are located in a
sheet metal box to the right of the AutoIQ
Controller. The compressor contactor is also
located in that box.
1. Disconnect electrical power.
2. Remove left front panel.
3. Remove 2 screws at the front edge of the metal
box, and pull the cover forward and out.
Note: Route wires so they do NOT contact the
discharge line.
The sensor for the Discharge line is marked
with a small piece of yellow tape. Do not
reverse the sensors.
4. To check components, reconnect electrical
power.
Note: The contactor coil is 24 volt.
May 2000
Page 38
Access Valves
CME1356 and CME1656
To use the access valves:
1. Be sure that the valve is closed. Remove the
stem cap and insert a 3/16" allen wrench. Check
that the valve is closed.
Allen
Wrench
Torque Stem
to 6-8 ft. lb.
Torque Stem Cap
to 8-12 ft. lb.
Torque Core Cap
to 7-12 ft. lb.
Access Valve
Access Valve
2. Remove the port cap and attach refrigerant
manifold hoses.
3. Open the valve and purge the hoses.
4. When service is complete, shut the discharge
access valve first. Then, with the machine running
and the middle hose outlet securely fastened to
the manifold or refrigerant tank (closed) open both
manifold valves. This allows any liquid refrigerant
in the discharge hose to flow thru the manifold and
into the suction side.
Refrigeration System Components
Due to the expected level of training and
experience of a refrigeration mechanic, detailed
instructions regarding the replacement of
refrigeration components will not be presented.
However, critical items will be noted here.
Refrigerant:
1. This ice machine uses R-404A or HP62 as a
refrigerant. It has several unique characteristics.
A. It is a near-azeotrope, and must be liquid
charged.
B. It must use polyol ester refrigerant oil, and that
oil is very water absorbent. The system must not be
open for more than 15 minutes.
C. An electronic leak detector capable of locating
HFC-134a type refrigerant must be used to locate
refrigerant leaks.
D. A special HFC type liquid line dryer must be
used.
E. When brazing, use a low pressure nitrogen
purge.
F. When evacuating, use of an electronic micron
gage is recommend. Evacuate to 300 microns.
5. After the gages have equaled, shut the manifold
valves and the suction access valve.
6. Remove the gages and replace the stem and
port caps. Make certain that they are tightly closed.
May 2000
Page 39
CME1356 and CME1656
Liquid Charging
Because R-404A is a near-azeotrope, only liquid
refrigerant can be used to recharge the
refrigeration system. To do that may take some
special techniques:
1. Use an electronic scale to measure the charge.
2. Place a drum or cylinder of R-404A on the
scale, liquid out side up (check container).
3. A refrigeration manifold should be attached to
the service access valves. Attach the charging
hose to the cylinder of R-404A. Open the
cylinder’s valve and purge the hose to the manifold.
4. Close the low side service access valve.
5. Open the discharge side manifold valve and
weigh in the name plate charge. After the charge
is weighed in, wait a few minutes and re-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.
Evaporators
In the unlikely event that an evaporator may need to
be replaced, do NOT braze the evaporator joints
when the evaporators are seated in the freezing
compartment, instead lift them up slightly so that
the joints to be brazed are above the top edge of
the freezing compartment.
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 and close
the low side manifold valve to flow liquid into the
manifold but flash off to vapor before it enters the
suction side of the refrigeration system. This
should only be a few ounces at most.
10. After the scale = the correct charge, shut off
the valve on the refrigerant cylinder.
11. With the ice machine running and the
discharge access valve closed, open both
manifold valves to allow the refrigerant in the
hoses to enter the system.
12. Shut the suction service access valve.
13. Remove the refrigeration manifold gages.
14. Replace and tighten all caps.
May 2000
Page 40
S
CME1356 and CME1656
Before Calling for Service
Check the following:
1. Has the water supply to the ice machine or building been shut off? If yes, the
ice machine will automatically restart within 25 minutes after water begins to
flow to it.
2. Has power been shut off to the ice machine? If yes, the ice machine will
automatically restart when power is restored.
3. Has someone shut the water off to a water cooled unit?. If yes, the ice
machine may need to be manually reset.
4. Does the bin control have ice on it? If so, remove the ice and the machine
should start in a few minutes.
To Manually Reset the machine.
1. Remove the left front panel.
2. Locate the AutoIQ 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 the left front panel.
2. Locate the AutoIQ Controller.
89
7
PUSH BUTTON
6
5
4
3
2
1
AutoIQ Controller
CONTROL SWITCHE
INDICATOR LIGHTS:
BIN FULL
FREEZE
HARVEST
CLEAN
OFF
DIAGNOSTIC LIGHTS:
WATER
REFRIGERATION
3. Push and hold the Off button for 3 seconds or until the machine stops.
May 2000
Page 41
Bulletin Number: PS-4-2002
Bulletin Date: February 2002
SERVICE BULLETIN
Subject: New Ice Sensors in CME1356, CME1656 and CME2006. New Ice
Sensors, new Water Level Sensors and new Controllers in CME306 and
CME456.
Ice Sensors: Scotsman has begun production of ice machines equipped with a new style of ice
sensor. The new sensor is interchangeable with the prior sensors, which are still in use on other
Scotsman modular cubers.
Controllers: Scotsman has also added the new blue controller (see PS-3-2002) to models CME306
and CME456.
Water Level Sensor: A new water level sensor is also being used on CME306 and CME456.
Service parts for the ice sensors and water level sensor have not changed.
Ice machines built prior to this change are not affected.
The new sensors’ use will be phased in by model throughout 2002.
Additional information is on the back of this bulletin.
Ice Sensor
Photo-Eyes in New Ice Sensor
Sensor Holder
Push to Release Photo-Eye
The new ice sensor’s have a photo-eye module that
can be separated from the holder.
Once separated, the lenses of the photo-eyes can
easily be cleaned with a soft cloth or cotton swab. Ice
machine cleaner may be used if needed.
Like the other style of sensor, the photo-eye part can
be placed in the reservoir when the ice machine is
being cleaned with ice machine cleaner.
When re-assembling, be sure that the wire is not
sticking out past the edges of the sensor holder.
Module
Photo-Eye Module Separated
from Holder
Route Wire Under Clip, Push
Module Into Place
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