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CME650R
INTRODUCTION
To the owner or user: This service manual is intended to provide you and the maintenance or service technician with the information needed to install, start up, clean, maintain and service this ice system.
The CME650R uses HP62 as the refrigerant, and polyolester oil for compressor lubrication.
Table of Contents
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
HARVEST CYCLE - HOT GAS BYPASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SERVICE DIAGNOSIS: Electrical and/or
SERVICE DIAGNOSIS: Refrigeration and/or
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.
Keep this manual for future reference.
This manual was printed on recycled paper.
October 1994
Page 1
CME650R
FOR THE INSTALLER
The CME650R will fit the following Scotsman ice storage bins:
••
*BH550
••
*HTB500, HTB350, HTB250
••
BH800 (with bin top KBT23)
••
BH900 (with bin top KTB22)
••
BH1360
It will also fit these Scotsman Dispensers:
••
CD200
••
IS150 (with adapter kit KADCM1)
••
RS150 (with adapter kit KADCM1)
*These smaller bins are recommended.
Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of U.L., N.S.F., and C.S.A.
Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any parts and/or other components not specifically approved by Scotsman.
Scotsman reserves the right to make design changes and/or improvements at any time.
Specifications and designs are subject to change without notice.
A remote condenser and precharged tubing kit are required to assemble this ice system.
The normal finish for the machine is enamel. An optional stainless steel panel kit (SPKCMD-1) can be field installed. It contains a stainless steel top, side panels, service panels, and front panel.
Model Number Dimensions
(without bin)
W" x D" x H"
Basic
Electrical
Minimum
Circuit
Ampacity*
CME650RE-32A 30 X 24 X 27 208-230/60/1 16.9
Maximum Fuse
(or HACR Circuit
Breakers) Size
20
Refrigerant
Charge**
HP62 (R-404a)
208 oz.
Condenser
Type
Remote Air
CME650RE-3A 30 X 24 X 27 208-230/60/3 5.9
15 208 oz
* Minimum Circuit Ampacity is used to determine wire size and type per the National Electric Code.
Remote Air
** The unit is shipped with the full charge in the receiver. For re-charging purposes, if the nameplate charge is different than this number, go by the nameplate.
Use Scotsman remote condenser RCE651-32A, RCE652-32A or ERC201-32A or ERC402-32A. Use precharged tubing kit RTE25 (25’) or RTE40 (40"). Fan relay kit KCMR230 required when two ice machines are powering 1 remote condenser.
This ice system (except remote condenser) is designed to be installed indoors, in a controlled environment.
Air Temperature
Water Temperature
Water Pressure
Voltage
MINIMUM
50
0
F.
40
0
F.
20 psi
-10%
MAXIMUM
100
0
F.
100
0
F.
80 psi
+10%
December 1995
Page 2
CME650R
Installation
Water
The water supply for this ice machine has been in contact with many materials since it fell from the sky as rain. All rain is slightly acidic, and tends to dissolve the materials it comes in contact with.
During water’s journey to the ice machine, it has flowed over and through the ground, been picked up by a municipal or private pump, forced through a series of pipes of differing construction and may have been treated by the municipality providing the water.
The water supplied to this ice machine will then contain a variety of substances that will likely show up as solids during the ice making process. These solids are similar to those found when water is boiled out of a saucepan. Only the water boils away, and the minerals that were in the water solidify in the pan. During ice making only the water is frozen into ice, the minerals stay behind in the reservoir. This machine dilutes the water in the reservoir every cycle to minimize the amount of minerals in the water system, but after time the minerals will appear and have to be dissolved by ice machine cleaner, then flushed away during the cleaning process.
An ice machine is a food manufacturing plant; it takes a raw material, in this case water, and transforms it into a food product, ice. The purity of the water is very important in obtaining pure ice and in maximizing product life.
The water to the ice machine should be filtered.
Water filters vary greatly in ability and function.
Install one that filters out suspended solids to a dimension of 5 microns or less. The finer the filter the better, but finer filters may plug-up sooner than course ones. It may be necessary to add a course filter ahead of the fine filter to prolong filter life.
Even though there isn’t one filter that will cure all water problems, a good filter combined with a polyphosphate feeder gives about the best overall performance.
Have the water tested. Acidic water or alkaline water will both cause corrosion. Dissolved solids cannot be filtered out. Check with a water treatment specialist regarding testing, treatment and filters.
Space is required for service access at the sides and utility connections at the back. 6 inch clearance is recommended.
The ice machine is not designed for outdoor use. It must be installed indoors, in a controlled environment. The air and water temperatures must not exceed rated limits.
Pre-installation:
1. Inspect the place where the ice machine is to be installed. Check for:
•• space for the cabinet,
•• water supply,
•• drain availability
•• and electrical power supply.
No extension cords are allowed. The building drain inlet must be lower than the drain outlet of the ice bin. The water supply must have a hand shut off valve accessible when the unit is installed.
October 1994
Page 3
CME650R
Installation
Assembly:
1. Attach the legs, or optional casters, onto the ice storage bin. Units that are stacked should only use legs, not casters.
2. Place the ice machine onto the storage bin.
3. Line up the ice machine, check that there is a good seal between the ice machine and the storage bin.
4. If on a Scotsman bin, attach the ice machine to the bin using the straps and bolts shipped with the ice machine. If on another brand bin, follow the directions included with that bin.
Bin Thermostat Installation:
1. Remove rubber cap from the end of the thermostat bracket.
2. Attach the bin thermostat bracket to the bottom of the ice machine using the thumb screws provided. There are pre-drilled and tapped holes located just behind the cube drop area. The end of the bin thermostat bracket with the plastic tubing on it will fit into the hole in the base of the machine.
3. Locate and uncoil a portion of the bin thermostat capillary tube. Route the end of the capillary tube into and through the bin thermostat bracket tube. It should be inserted the full length of the tube, but not past the end.
Stacking:
This machine will stack onto any CM250,
CME250, CM450, CM500, CME500, CM650 or
CME650 with the same cabinet depth (24").
1. Remove and discard the top panel from the lower unit.
2. Carefully lift the uncrated top unit onto the bottom unit. Use of a mechanical lift is recommended for this step.
3. Align the two ice maker cabinets.
4. Secure the top unit to the bottom one with the hardware and straps shipped with the upper machine.
5. Locate and uncoil all of the bin thermostat capillary tube.
6. Route the bin thermostat capillary tube from the upper unit, through the hole in the back of the reservoir, through the lower unit and into the bin thermostat bracket. Discard upper unit bracket.
March 1994
Page 4
Strap
Bin Thermostat Bracket
Bin Thermostat
Installation
Thermostat
Capillary Tube
Bin Thermostat
Bracket
Stacking
Capillary Tube
Routing Hole
Reservoir
CME650R
FOR THE INSTALLER: Remote Condenser
Locate the condenser as near as possible to the interior location of the ice maker.
Location of the condenser is limited by the specific length of precharged refrigerant tubing supplied for the application. The pre-charged tubing connects the icemaker to the remote condenser. The condenser must be above the ice maker.
Select the best available location, protecting the condenser from extremes of dirt, dust, and sun.
Meet all applicable building codes.
Roof Attachment:
Install and attach the remote condenser unit to the roof of the building, using the methods and practices of construction that conform to the local building codes, including having a roofing contractor secure the condenser to the roof.
Locate Condenser No
Lower Than Ice Machine
Remote
Condenser
Excess
Tubing
Inside
Building
Precharged Line Routing
///////////////////////////////CAUTION/////////////////////////////////
Do not connect precharged tubing until all routing and forming of the tubing is complete. See the coupling instructions for connecting instructions.
////////////////////////////////////////////////////////////////////////////////
1. Each set of precharged refrigerant lines consists of a 3/8 inch diameter liquid line, and a 1/2 inch diameter discharge line. Both ends of each line have quick connect couplings, the end without access valves goes to the icemaker.
Note: The openings in the building ceiling or wall, listed in the next step, are the minimum sizes recommended for passing the refrigerant lines through.
2. Have the roofing contractor cut a minimum hole for the refrigerant lines of 1.75". Check local codes, a separate hole may be required for the electrical power to the condenser.
///////////////////////////////CAUTION//////////////////////////////////
DO NOT KINK OR CRIMP REFRIGERANT
TUBING WHEN INSTALLING IT.
////////////////////////////////////////////////////////////////////////////////
3. Route the refrigerant lines through the roof opening.
Follow straight line routing whenever possible.
Any excess tubing MUST be retained within the building.
4. Spiral any excess length of pre charged tubing inside the building. Use a horizontal spiral (as illustrated) to avoid any traps in the lines.
Note: Spiral need not be as tight as illustrated.
5. Have the roofing contractor seal the holes in the roof per local codes.
TYPICAL
INSTALLATION
October 1994
Page 5
CME650R
FOR THE INSTALLER: Coupling Instructions
////////////////////////////////CAUTION/////////////////////////////////
The couplings on the sets of precharged lines are self sealing when installed properly. Carefully follow the instructions:
////////////////////////////////////////////////////////////////////////////////
Initial Connections:
1. Remove the protector caps and plugs. Wipe the seats and threaded surfaces with a clean cloth to be certain that no foreign matter remains on them.
2. Lubricate the inside of the couplings, especially the O-Rings with refrigerant oil.
••
The 1/2 inch discharge line (schrader valve end) goes to the remote condenser fitting marked “discharge line”.
••
The 3/8 inch liquid line (schrader valve end) goes to the remote condenser fitting marked
“liquid line”.
Final Connections:
3. Begin tightening the couplings together by hand, then using two wrenches (it is important that
ONLY the nut on the precharged lines be turned, the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be loose in the refrigeration system) tighten the coupling until it bottoms out or a definite increase in resistance is felt.
TIGHTENING THE QUICK CONNECTS
••
The 1/2 inch discharge line goes to the icemaker fitting marked “discharge line”.
••
The 3/8 inch liquid line goes to the icemaker fitting marked “liquid line.”
Discharge Line
Schrader
Valves
4. Using a marker or pen, mark a line lengthwise from the coupling union nut to the bulkhead. Then tighten the coupling and additional 1/4 turn. As the nut turns, the line will show when 1/4 turn is made.
5. After all connections are made, and after the king valve has been opened, check the couplings for leaks.
Note: The system charge is contained in the receiver tank of the ice machine. Only "holding" charges are present in the "precharged" tubing or the condenser.
Liquid Line
Insulation
Ice Maker Connections
March 1994
Page 6
CME650R
FOR THE ELECTRICIAN
SEE NAMEPLATE for current requirements to determine wire size to be used for electrical hookup. When the cuber and the remote condenser are connected, each must be grounded to the other using the ground screws provided in the respective junction boxes. The cuber then requires a solid chassis to chassis earth ground wire. See Wiring Diagram.
Be certain the cuber is connected to its own electrical circuit and individually fused. Voltage variation should not exceed ten percent of the nameplate rating, even under starting conditions.
Low voltages can cause erratic operation and may be responsible for serious damage to the icemaker.
The remote condenser is designed to be powered from the ice machine. There is a separate electrical junction box at the back of the ice maker for the remote condenser. Wire the remote condenser to the ice maker in accordance with local and national electric codes. All outdoor wiring must be in rain proof conduit.
The condenser fan motor will run whenever the compressor is running.
Electrical connections are made at the rear of the icemaker, inside the junction box.
All external wiring should conform to the national, state and local electrical code requirements. Usually an electrical permit and services of a licensed electrician will be required.
ELECTRICAL CONNECTIONS
INTERCONNECTING
WIRES
HAND
DISCONNECT
SWITCH
REMOTE CONNECTION
October 1994
Page 7
CME650R
ELECTRICAL CONNECTIONS: KCMR230 Kit
When 2 ice machines are connected to 1 remote condenser and the fan motor is powered from the ice machines, a relay kit is required to maintain power to the fan motor.
All external wiring should confrom to the national, state and local codes.
1. Attach the control box of the KCMR230 to a permanent location that is convenient for each ice machine’s connection and for future service.
Attach a solid earth ground wire to the Ground
Screw.
2. Route connecting wires from the first ice machine’s fan junction box and connect to the relay kit terminal strip marked: No. 1 Ice Machine.
3. Route connecting wires from the second ice machine’s fan junction box and connect to the relay kit terminal strip marked: No. 2 Ice Machine.
4. Attach wires at the KCMR230 terminal strip marked: To Remote Fan, and route them to the remote condenser junction box.
5. Make the proper electrical connection at the junction box.
Conform To All Applicable Codes
Remote Condenser
Junction Box
Possible Location for KCMR230
Fan Juntion Boxes
KCMR230 Installation
March 1994
Page 8
KCMR230: Phasing Check
Check the phasing of the fan relay electrical circuit as follows:
Note: 3 phase machines must have the same "leg" or line connected to L3 on BOTH ice machine’s contactors and if there is "Wild Leg" current, it must be connected to L3 on BOTH ice machines.
A. Before initial start up: Compare the illustration of the KCMR230 terminal strip to the connections at the KCMR230.
••
Terminals #1 and #3 must be connected to the same side of the line (such as L1).
••
Terminals #2 and #4 must be connected to the same side of the line (such as L2).
CME650R
B. After initial start up, test with a volt meter
(compressors must be operating for this test).
1. Switch on ice maker #1, then ice maker #2.
2. Test with a volt meter between terminals #2 and
#4, then between terminals #1 and #3.
Compare the data to that in this table.
Test Terminals
1 - 2
1 - 3
2 - 3
2 - 4
3 - 4
1 - 4
Correct Voltage Readings
Full Voltage (208-230)
No Voltage
Full Voltage
No Voltage
Full Voltage
Full Voltage
If there is full voltage where there should be No voltage:
••
Switch off ice maker #2 (compressor switch also), and then switch off ice maker #1.
••
Reverse the connections at the KCMR230 terminal strip marked ice maker #1 (put the wire that was on 1 on 2 and the wire that was on 2 on 1).
Do all wiring with the electrical power disconnected to BOTH ice makers at the source.
October 1994
Page 9
CME650R
FOR THE PLUMBER
The recommended water supply line is a 3/8-inch
O.D. copper tubing with a minimum operating pressure of 20 PSIG and a maximum of 80 PSIG.
Connect to cold water supply line with standard plumbing fittings, with shut off valve installed in an accessible place between the water supply and the cuber. In some cases a plumber will be required.
Water Limitations:
An ice machine is a food manufacturing plant, it takes in a raw material, water, and turns it into a food product, ice. The purity of the water is very important in obtaining pure ice and in maximizing product life. Even though there isn’t one filter that will cure all water problems, a good filter combined with a polyphosphate feeder gives about the best overall performance.
DRAIN
Connections: All drains are gravity type and must have a minimum of 1/4-inch fall per foot on horizontal runs. The drains to be installed to conform with the local plumbing code. Install a vertical open vent on drain line high point to insure good draining. The ideal drain receptacle is a trapped and vented floor drain. Recommended bin drain is 5/8 inch O.D. copper tubing and should be vented and run separately. Insulation for high humidity areas is recommended.
The ice machine sump drain is 3/4" FPT. There must be a vent at this connection for proper sump draining.
Optional
Filter
Sump Drain Must
Be Vented
Potable
Water
Supply
3/4" FPT
3/8" Male
Flare
Hand Shut
Off Valve
Vent
Maintain The Code
Required Air Gap
Between Drain Lines
And Building Drain
BIN DRAIN
Note: Some
Bins Drain Out
The Bottom
March 1994
Page 10
WATER SUPPLY AND DRAIN CONNECTION
FINAL CHECK LIST
1. Is the cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified?
2. Is there clearance at the left and back sides of the cabinet for service access?
3. Has water supply pressure been checked to insure a minimum of 20 PSIG and a maximum of
80 PSIG operating pressure?
4. Is the cabinet level?
5. Check that any shipping material has been removed from inside the cabinet.
6. Check that the bin thermostat bracket has been installed, and the bin thermostat capillary tube has been routed thru the bracket.
7. Have all electrical, water and drain connections been made?
8. Is the water supply line shut off valve installed and electrical wiring properly connected?
9. Check all refrigerant lines and conduit lines, to guard against vibration or rubbing and possible failure.
10. Have the bin and cabinet been wiped clean?
11. Has the Manufacturers
Registration form been properly filled out? Check for correct model and serial numbers from
Serial nameplate, then mail to the SCOTSMAN factory.
12. Has the owner/user been given the Service Manual and instructed how to operate and maintain the icemaker?
13. Has the owner been given the name and telephone number of the authorized
SCOTSMAN Service Agency serving him?
PRECHARGED
LINES
CONNECTED
HAND SHUT
OFF VALVE
FINAL INSTALLATION
OPTIONAL
FILTER
LEVEL
ASSEMBLY
BIN
DRAIN
CME650R
SUMP
DRAIN
October 1994
Page 11
CME650R
COMPONENT LOCATION
The ice machine is designed for front service.
Many components are serviceable from the front without removing the side panels:
Behind the front panel:
••
Water pump
••
Inlet water valve
••
Reservoir
••
Evaporators
••
Water distributor
••
Control box with cube size control adjustment
••
ON/OFF switch
••
Compressor switch
Inside the control box is the control system for the ice machine.
Timer Cube Size Control
Master Switch
Compressor Switch
Bin Thermostat
Control Box
Bin Thermostat
Overflow
Standpipe
Water
Distributors
Drain Trough
Water Pump
Component Location
March 1994
Page 12
Bin Thermostat Bracket
Water Inlet Valve
CME650R
COMPONENT DESCRIPTION: Control System
Cube Size Control
This reverse acting thermostat controls the length of the freezing cycle. It is sensing the temperature of the suction line. When the suction line gets cold enough, the cube size control closes (on temperature fall) and starts the timer. A change in either ambient air or incoming water temperature will affect the efficiency of the refrigeration system, and this will vary the length of time it takes the evaporator to reach the temperature at which the cube size control is preset to close. See CUBE
SIZE ADJUSTMENT BEFORE attempting to adjust the control.
Relay
The multi-function, three pole, double throw, plug-in relay is installed directly into a receptacle on the printed circuit board in the control box. The relay functions in part to by-pass the bin thermostat control to prevent the icemaker from shutting OFF, when the bin thermostat opens during the freezing cycle. The bypass action serves to ensure full-sized ice cubes with each harvest cycle.
Timer - Timer & Switch Assembly
The function of the timer begins when activated by the cube size control. The outer surface, or large diameter lobe of the timer cam, determines the timer cycle for finish freezing of the ice cubes, while the inner surface, or small diameter lobe, determines the time cycle for the harvest cycle.
When the microswitch button is pushed in there is power connected to the coil of the relay, and the unit is in the freeze cycle. When the microswitch button is released, the power to the relay is stopped, and the unit goes into harvest. The microswitch is actuated by a cam assembly directly connected to the timer motor.
One complete rotation of the cam will take eight minutes. Harvest is preset at two and 2 thirds minutes, but is adjustable.
High Pressure Safety Cut Out Switch
This is a manual reset control that shuts down the icemaker, should the discharge pressure ever reach 450 PSIG. Located next to the control box.
Low Pressure Control (Pump Down)
This pressure control connects power to the compressor contactor coil. Its Cut In is 30 PSIG and its Cut Out is 15 PSIG. Located behind the control box.
CONTROL BOX
High Pressure Safety
Cut Out Switch
Cube Size Control
Relay
Timer & Switch
Bin Thermostat
October 1994
Page 13
CME650R
COMPONENT DESCRIPTION: Water System
Water Inlet Solenoid Valve
The water inlet solenoid valve controls the flow of water to the reservoir. It fills the reservoir with water and excess water overflows out the standpipe and down the drain. This action fills and rinses the reservoir during each harvest cycle. The flow rate is .75 g.p.m.
Water Pump
The water pump operates whenever the ice machine is making ice. It picks up water from the reservoir and forces it to the top of the evaporator, where it enters the water distribution system.
Water Distribution System
The water distribution system evenly supplies water to all cells of the evaporator plates. The water pump pumps water from the sump up the vertical tygon tube to the tee.
From there water is channeled through the water manifold to the water distributors, above each evaporator plate, and from six holes within each distributor, water flows to the cells of each side of the evaporator plates. Gravity flow returns the unfrozen excess portion of water to the sump reservoir for recirculation.
Water Distribution
System
Water System Components
Water Inlet
Valve
Water
Pump
March 1994
Page 14
CME650R
INITIAL START UP
Before Start Up:
1. Check that the Master ON-OFF switch and the
Compressor ON-OFF switch are in the OFF position.
2. Switch on the electrical power. Electrical power must be supplied to the ice machine for 4 hours before starting the compressor for the first time.
The crankcase heater will now warm up the compressor’s oil. The oil is warmed to evaporate any refrigerant that may have collected in it. If there is refrigerant in the oil when the compressor starts, the oil will foam and will not lubricate the compressor properly, shortening its life.
Do not start the compressor for the first time unless the dome of the compressor is warm.
Start Up:
1. Remove front panel.
2. Remove two screws and the control box cover.
3. OPEN the water supply line shut off valve.
4. Open the “king” valve on the receiver.
5. Inside the control box is the shaft of the timer and switch assembly. Rotate the shaft of the timer and switch assembly clockwise to start the timer.
The timer starts when the actuator arm on the microswitch drops off outer cam into cam slot. See
“Front View of Timer”.
6. Move the Master ON-OFF switch to the ON position.
7. Allow the reservoir to fill. If needed, rotate the timer clockwise a to begin another "harvest" cycle to add more water to the reservoir.
Note: Some water will drip off the evaporators, this is normal and there will be a reduction in water dripping after several cycles of ice.
8. When the sump has filled, move the compressor
ON-OFF toggle switch, to the ON position.
9. Check operation of the freezing cycle: As the icemaking process begins the water temperature falls and very shortly ice begins to form. Tubing will become frosted at the top of the evaporator plate.
Freezing time will range between 13 and 16 minutes. Longer time for temperatures above 70 degrees F. and shorter time required when temperatures are below 70-degrees F. Average complete cycle time is about 16 minutes.
ACTUATOR
FRONT VIEW OF TIMER
BUTTON
MICROSWITCH
CAM
FREEZE
PORTION
CONTROL BOX
HARVEST
PORTION
Cube Size
Control
Master Switch
Compressor
Switch
Timer
Bin
Thermostat
April 1995
Page 15
CME650R
INITIAL START UP
10. Check Cube Size
To produce SMALLER sized ice cube:
Locate cube size control knob, in the front of the control box. Rotate one eighth of a turn
COUNTER Clockwise. Observe size of the ice in the next ice cube harvest and adjust in one eighth turn or less increments, until correct ice cube is achieved.
To produce LARGER ice cube:
Locate cube size control on the front of the control box Rotate the adjusting knob one eighth of a turn
Clockwise. Observe size of ice cubes in the next cube harvest and adjust in one eighth turn or less increments, until correct ice cube size is achieved.
11. Check harvest time. The machine will have to harvest all of the cubes before it goes back into the freeze cycle.
Increase the Harvest Time if there is less than 15 seconds of harvest time after the last cube has fallen into the bin.
Decrease the Harvest Time if there is much more than 15 seconds of harvest time after the last cube has fallen into the bin. Note: Harvest time is dependent upon the water and air temperatures at the ice machine. Colder air and water will result in faster ice making, but longer harvest cycles. Do
NOT adjust harvest time too short, as this will cause a freeze up of the evaporators.
CONTROL BOX
JUST RIGHT
When the cubes are the correct size, they will be connected together vertically, and drop off in strips.
Typical batch weight is 5.5 lb.
TOO SMALL
CUBE SIZE DIAGRAM
CUBE SIZE
CONTROL
To Adjust Harvest Time:
A. Disconnect electrical power.
B. Locate timer cam in the control box.
C. Loosen set screw holding the two halves of the cam together, and rotate the front half to increase or decrease the harvest portion of the cam (low part).
D. Re-tighten the set screw.
E. Reconnect power and check the cube size after the next cycle (cube size may need adjustment).
12. Replace control box cover and all cabinet panels and screws.
13. Check operation of the bin control by holding ice on the bin control tube in the bin. The machine should shut off at the end of the harvest cycle.
14. Thoroughly explain to the owner/user the significant specifications of the icemaker, the start up and operation, going through the procedures in the cleaning instructions. Answer all questions about the icemaker by the owner; and inform the owner of the name and telephone number of the local authorized SCOTSMAN Distributor, or service agency.
BIN ICE LEVEL
SWITCH
March 1994
Page 16
CME650R
FREEZING CYCLE OPERATION
Water from the sump assembly is pumped to the water distributor system at the top of each evaporator plate. From the water distributor the water cascades by gravity over all cells of the plate and to the sump assembly below.
At the beginning of the freezing cycle, the electrical circuit is completed to the compressor and the water pump. The water pump operates continuously, through both the freezing cycle and the harvest cycle.
During the freezing cycle, the hot gas solenoid valve is CLOSED and the water inlet solenoid valve is CLOSED. When the ice cubes are partially formed, the cube size control will sense the temperature at which it is preset to CLOSE. This will complete the electrical circuit to the timer. The timer then controls the remainder of the freezing cycle.
The timer will keep the icemaker operating in the freezing cycle for a selected length of time. This will give the ice cubes time to fully form. After that selected length of time, the timer will switch the icemaker into the harvest cycle, through the contacts of the timer assembly microswitch.
Low Temperature Freeze:
When the outside air temperature is low, the Head
Pressure Regulator will close off the liquid line to the receiver, causing liquid refrigerant to back up into the condenser until the head pressure builds up to 240 PSIG. While this is occurring, the head pressure regulator passes discharge gas into the receiver to keep the refrigerant flowing.
REFRIGERATION SCHEMATIC
Liquid
Line
Head
Pressure
Control
Valve
Fan
Motor
Discharge
Line
Discharge
Coil
Heat
Exchange
Filter
Hot Gas
Valve
(Closed)
Suction
Line
Receiver
King
Valve
Compressor
Crankcase
Heater
Filter/Dryer
Liquid
Line Valve
TXV
Water
Valve
(Closed)
Pump
Drain
October 1994
Page 17
Evaporators
CME650R
HARVEST CYCLE - HOT GAS BYPASS
When the timer switches the icemaker into the harvest cycle, high pressure, high temperature refrigerant gas discharged from the compressor flows through the hot gas solenoid valve into each evaporator plate. During this cycle, the refrigerant bypasses the condenser. In the electrical circuit, both the compressor and the water pump are operating. Both the hot gas solenoid valve and the water inlet solenoid valve are OPEN.
The finished ice cubes are released from the sides of each evaporator plate by the warming effect of the hot gas condensing in each evaporator plate and the water cascading over the ice cubes. The released ice cubes drop into the ice storage bin below. At the end of the harvest cycle, the timer cam will push the actuator arm to the microswitch
IN. If the ice level control is still CLOSED, a whole new cycle will begin. If the ice level control is
OPEN, the icemaker will begin to shut OFF.
Pump Down Cycle:
When the ice level control is open at the end of the harvest cycle, power is removed from the liquid line valve coil, and the pump down cycle begins.
The compressor will continue to run until the pump down control, sensing low side pressure, opens at
15 PSIG.
REFRIGERATION SCHEMATIC
Liquid
Line
Head
Pressure
Control
Valve
Fan
Motor
Discharge
Line
Discharge
Coil
Heat
Exchange
Filter
Hot Gas
Valve
(Open)
Suction
Line
Receiver
King
Valve
Compressor
Crankcase
Heater
Filter/Dryer
Liquid
Line Valve
TXV
Water
Valve
(Open)
Pump
Drain
March 1994
Page 18
Evaporators
CME650R
CLEANING & SANITIZING
1. Remove front panel.
2. Remove control box cover, and turn the timer cam clockwise until the unit is in a harvest cycle. At the end of the harvest cycle switch the master and compressor switches to OFF. Replace the control box cover.
Electrical Shock
Hazard.
Electrical shock can cause personal injury.
Cleaning procedures are done with the power ON.
3. Remove all ice from the bin.
4. Remove 4 thumbscrews and the evaporator cover.
5. Remove water pump discharge hose from evaporator water inlet, direct hose into bin or bucket and switch the master switch ON until reservoir is empty of water. Replace hose on inlet.
6. Replace evaporator cover.
7. Mix 8 ounces of Scotsman Ice Machine Cleaner with 1 gallon of warm (95
0
F. - 115
0
F.) water and pour into the reservoir until full.
Scotsman Ice Machine
Cleaner contains acids. These compounds may cause burns.
If swallowed, DO NOT induce vomiting. Give large amounts of water or milk. Call Physician immediately. In case of external contact, flush with water.
KEEP OUT OF THE
REACH OF CHILDREN.
8. Switch the master switch ON, and operate the unit for 20 minutes, then switch the unit OFF.
9 Repeat steps 4 and 5.
10. Wash the plastic and stainless liners of the freezer section with a solution of household bleach
(1 ounce of bleach to 2 gallons of water) and warm
(95 o
F. - 115 o
F.) water. Allow to air dry.
October 1994
Page 19
11. Pour 1 ⁄
2
gallon of the solution mixed in step 10 into the reservoir. Replace the evaporator cover.
12. Switch the master switch back ON, operate the unit for 5 minutes. Switch unit OFF.
13. Repeat steps 4, 5 and 6.
14. Pour about 1/2 gallon of clean potable water into the reservoir, and switch the master switch
ON. After 5 minutes switch the master switch OFF and repeat steps 4, 5 and 6.
15. Switch master and compressor switches ON.
16. Replace the front panel
17. Discard the next batch of cubes to make sure all of the acid & sanitizer is gone.
/////////////////////////////////CAUTION///////////////////////////////
DO NOT use ice cubes produced from the cleaning or sanitizing solutions. Be sure none remain in the bin.
/////////////////////////////////////////////////////////////////////////////////
18. Pour hot water into the storage bin to melt the cubes and also clean out the bin drain.
19. Wash the bin liner with a solution of household bleach (1 ounce of bleach to 2 gallons of water) and warm (95 o
F. - 115 o
F.)water. Allow to air dry.
20. The unit will now continue automatic operation.
Water Distributor:
Note: The water distributor may need to be cleaned separately.
1. Remove evaporator cover.
2. Remove water distributor assembly by pushing the assembly to the right until the left end clears the retaining tab.
3. Lift up the left end of the water distributor assembly and pull the assembly to the left.
4. Un-snap the water distributors from the "T", and inspect for mineral deposits. Clean as required.
5. Reverse above steps to reassemble. Be certain that water distributors are in place and secure.
Scale that may form on the plastic liner can be removed by scrubbing the surface with a mixture of Scotsman Ice Machine Cleaner and hot water.
Remove any scale prior to cleaning.
CME650R
CLEANING
Remote Condenser
1. Shut off the ice machine.
The fan blade can cause personal injury.
Disconnect power before beginning to clean condenser.
2. Remove dirt and debris that might be under the condenser.
3. Brush off the bottom of the condenser fins. Do not use a wire brush.
4. Check to see that the inside of the condenser is clean; light should be visible through the fins. If not, clean the internal parts by vacuum, pressure washer and/or coil cleaner.
Ice Storage Bin
The interior liner of the bin is in contact with a food grade product: ice. The storage bin must be cleaned regularly to maintain a sanitary environment. Scale that may form on the plastic liner of a bin may be removed by scrubbing the surface of the line with a mixture of Scotsman Ice
Machine Cleaner and hot water. Remove any scale prior to sanitizing.
Note: Some ice storage bins have Stainless
Steel liners. They may become stained from chlorine gases released from the water. These stains must be removed by regular cleaning to prevent pitting of the metal liner. To prevent the staining, an activated charcoal filter should be added to the ice machines incoming water supply line; activated charcoal removes the chlorine. This may require more frequent sanitation.
To remove scale:
1. Mix a cleaning solution of 4 ounces of Scotsman
Ice Machine Cleaner to 4 pints of hot (95
110
0
F.) water.
0
F. to
Scotsman Ice Machine
Cleaner contains acids. These compounds may cause burns.
If swallowed, DO NOT induce vomiting. Give large amounts of water or milk. Call Physician immediately. In case of external contact, flush with water.
KEEP OUT OF THE
REACH OF CHILDREN.
2. Remove all ice from the bin.
3. Using rubber gloves, dip a nylon scouring pad into the cleaning solution, and scrub the scale off of the liner.
4. After the scale has been removed, rinse all of the surfaces inside the bin with clean, potable water.
To sanitize the bin and ice machine:
Follow local codes for frequency of sanitizing. Use an approved sanitizer and follow the directions and warnings of that sanitizer or use the following instructions for use of household bleach, if it meets local codes:
1. Remove all ice from the bin.
2. Mix a sanitizing solution of 1 ounce of household bleach to 2 gallons of water.
3. Using clean rubber gloves and a clean cloth, wipe all interior surfaces of the ice machine and ice storage bin with the sanitizing solution.
Immerse any small parts in the sanitizing solution and wash the parts, flushing the solution thoroughly in, over and through all parts and surfaces of the parts being cleaned.
4. Allow to air dry.
March 1994
Page 20
CME650R
SYSTEM SPECIFICATIONS
The following numbers can be used as a guideline. There will be some variation from unit to unit.
Typical Cycle Time
••
14-16 minutes @ 0 o
F. condenser, 70 o
F. air and 55 o
F. water
••
15-17 minutes @ 90 o
F. condenser, 90 o
F. air and 70 o
F. water
Typical Harvest Ice Weight
••
5-6 lb.
Typical Low Side Pressure (at the end of freeze)
••
27 PSIG
Typical Freeze Cycle Discharge Pressure
••
250 - 270 PSIG @ 90 o
F. condenser, 90 o
F. air and 70 o
F. water
••
Discharge pressure control valve rated for 240 PSIG
Refrigerant Charge
••
208 ounces of R-404A
Harvest Time
••
Preset at 2.66 minutes, may be adjusted to suit local conditions
Typical Suction Pressure in Harvest
••
90 - 95 PSIG @ 70 o
F. air and 50 o
F. water
••
100 - 110 PSIG @ 90 o
F. air and 70 o
F. water.
Typical Compressor Amp Draw
••
7 - 8 freeze, 9 - 10 harvest
High Pressure Cut Out
••
Cuts out at 450 PSIG, manual reset
Pump Down Pressure Switch
••
Closes at 35 PSIG
••
Opens at 15 PSIG
Compressor
••
Copeland CS12K6E
Bin Thermostat
••
Adjustable: C.I. range between 38.5
o
F., and 43.5
o
F.; C.O. range between 33.5
o
F.,and 38.5
o
F.
Timer
••
1 revolution takes 8 minutes
Cube Size Control
••
Cut In adjustable between 0 o
F. and +24
0
F.
Remote Condensers:
••
RTE651-32A: 2 ton, 1 circuit, 208-230 volt.
••
RTE652-32A: 2 ton, 2 circuit, 208-230 volt
Thermostatic Expansion Valve
••
Not adjustable
October 1994
Page 21
CME650R
ADJUSTMENTS
Electrical power present in the control box can cause personal injury.
Disconnect power before beginning to adjust timer.
Adjustment Of The Timer & Switch Assembly
One complete revolution of the cam on the timer takes eight minutes. The machine ships with the harvest time set at 2 2 ⁄
3
minutes. It is important that the length of the harvest cycle allow enough time for all the ice cubes to fall from the evaporator. Too short of a time will cause the evaporator to freeze up and stop ejecting ice into the bin. Too much time wastes icemaking capacity, energy and water.
Adjustment of the harvest cycle may require a corresponding adjustment of the cube size control.
Rotating the shaft of the timer cam clockwise will allow putting the machine into either the freezing cycle or harvest cycle, as required in the cleaning instructions.
To Adjust The Timer & Switch Assembly:
MICROSWITCH CLOSE UP
VIEW OF TIMER
SWITCH
ACTUATOR
CAM
The length of the harvest cycle can be changed by loosening the set screw on the cam, and then rotating the shaft so that the opening between the cams change. More of an opening between the cams = more harvest time.
TIMER
CAM
ADJUSTING TIMER
March 1994
Page 22
CME650R
SERVICE DIAGNOSIS: Water
SYMPTOM
No ice is made
POSSIBLE CAUSE
Inlet water valve will not open or is dirty
No water being pumped over evaporators.
PROBABLE FIX
Clean inlet screen, check coil, replace valve if required
Check pump motor, replace pump if motor will not run.
No water in reservoir, check inlet water valve, check reservoir for leak.
Replace inlet water valve Water inlet valve leaks thru at high rate
Cubes are not uniform in shape Water distributors are dirty
Long Freeze Cycle Inlet water valve leaks through
Makes thick ice/freezes up
Cubes too large
Low Capacity
See electrical/adjustment
Water inlet valve restricted
Low water pressure
Inlet water valve leaks through
See electrical/adjustment
Incoming water very warm
Unit runs out of water
Lack of water
Reservoir leaks
Inlet water valve restricted
Short harvest cycle
Water pressure too low
Clean water system
Replace inlet water valve
See electrical/adjustment
Clean or replace valve
Check water filter or supply
Replace inlet water valve
See electrical/adjustment
Check water temperature to building
See unit runs out of water
Repair leak
Clean or replace valve
Adjust timer
Check supply
October 1994
Page 23
CME650R
SERVICE DIAGNOSIS: Electrical and/or Adjustments
SYMPTOM
Machine does not operate
Makes thick ice/freezes up
Runs, makes no ice
Long freeze cycle
Cubes too small
Cubes too large
Compressor cycles on and off on pump down control
Compressor will not run
Unit cycles on and off anytime in any cycle
POSSIBLE CAUSE
No power
High pressure control open
High temperature cut out open
P. C. Board Open
Master switch open
Timer contacts open
Bin thermostat holding machine off
Harvest Cycle too short
Low water pressure
PROBABLE FIX
Reconnect power
Reset, check machine
Hot gas valve leaks thru, replace
Replace board
Test/replace
Replace timer
Test thermostat, replace if contacts stuck open.
Hot gas valve defective
Cubes too small
Cube size control stuck open
Pump problem or water leak in reservoir
Adjust timer
Check water filter or supply
Check inlet water valve screen and flow control.
Replace hot gas valve
Adjust cube size
Replace cube size control
Check water system and pump
Water inlet valve either lets in no water or leaks through
Timer stuck
Replace inlet water valve
Relay does not energize; unit stuck in harvest
Water inlet valve leaks through
Replace timer
Replace relay
Water temperature too high
Cube size set wrong
Replace inlet water valve
Advise user
Adjust cube size
Cubes size control stuck closed Replace cube size control
Water inlet valve leaks through Replace inlet water valve and adjust cube size control
Low refrigerant charge Locate leak, repair, replace drier, evacuate and weigh in nameplate charge.
Liquid line valve or drier restricted Check and replace
TXV restricted
Head pressure control valve not working (low condensing temp.)
Check and replace
Check/replace head pressure control valve
Low pressure control will not close Check pump down control for proper operation
Contactor coil open Check/replace contactor
Compressor windings open
Loose connection in PC board
Check replace compressor
Replace PC board
March 1994
Page 24
CME650R
SERVICE DIAGNOSIS: Refrigeration and/or Mechanical
SYMPTOM
Poor harvest
Unit cycles off during freeze or harvest
Low capacity
Unit shuts off before bin is full
Compressor cycles on and off
Frost on compressor
POSSIBLE CAUSE
Hot gas valve does not open
Head pressure control valve does not maintain enough head pressure.
Hi temperature switch opens and closes
High head pressure, from dirty condenser, faulty fan motor
Non condensable gas in the system
Extreme hot location
Overcharge of refrigerant
Hot gas valve leaks thru
PROBABLE FIX
Check for power to the coil, check for not opening, replace
Replace head pressure control valve.
Hot gas valve leaks thru, replace it
Clean condenser, repair fan motor
Purge system, evacuate and weigh in nameplate charge
Relocate the cabinet
Evacuate and weigh in nameplate charge
At the end of the freeze cycle there should be frost on the evaporator end of the hot gas tubes, if not replace the hot gas valve
Separate and insulate them Liquid and discharge lines are in contact with each other
Bin thermostat adjusted to open too soon.
Low pressure control opening and closing
Rotate knob on the thermostat clockwise to a colder setting.
Check low side pressure, liquid line valve must open and low side pressure raise over 35 PSIG before pump down control will close to run compressor
Compressor overheats TXV not letting enough refrigerant into evaporators, adjust or replace TXV
Mechanical fault with compressor, replace compressor
Some frost will not hurt Do nothing
TXV meters too much refrigerant Adjust or replace TXV
October 1994
Page 25
CME650R
REMOVAL AND REPLACEMENT
Electrical Shock
Hazard.
Electrical shock can cause personal injury.
Disconnect power before beginning to service components.
Cube Size Control
To remove the cube size control:
1. Remove front panel.
2. Remove cover from control box.
3. Trace capillary tube, from the cube size control to the refrigerant suction line.
Tube Well On
Suction Line
Water Distributor Tubes And Manifold Tubes
To remove the water distributor tube and manifold tube:
1. Remove the front panel.
2. Slide the water distributor tube to the front about
1/8-inch along the top of the evaporator plate, until the water distributor tube can be unsnapped from the flexible notch and lifted upward.
3. Unsnap and disconnect water distributor tubes
WATER
DISTRIBUTOR
Cube Size
Control Pig Tail
REPLACEMENT OF THE CUBE SIZE CONTROL
4. Remove the coiled capillary tube bulb from the tube well on the suction line.
5. Remove electrical leads from the cube size control.
6. Remove screws and pull the capillary tube through the notch in the back of the control box.
Remove the cube size control. To replace the cube size control, reverse the removal procedure. from the water manifold section. To replace the water distributor tubes and manifold tubes, reverse the removal procedure. BE SURE the notches in the water manifold tubes properly engage the alignment keys in the tee. BE SURE the water distributor tube is securely fastened at the notch at both sides of the evaporator plate. Check identical attachment for the left water distributor tube and notch; also, that the distributor/manifold connections at the top center of each evaporator plate is snug against the top of the plate.
March 1994
Page 26
CME650R
REMOVAL AND REPLACEMENT
Electrical Shock
Hazard.
Electrical shock can cause personal injury.
Disconnect power before beginning to service components.
Water Pump
1. Remove front panel.
2. Unplug water pump electrical connection.
3. Drain water reservoir.
4. Use corbin clamp pliers to loosen and slide corbin clamps on hoses away from pump.
5. Remove screws retaining pump to bracket.
6. Pull pump out of ice machine.
7. Reverse to reassemble.
8. Replace front panel.
8. Reconnect electrical power.
Inlet Water Solenoid Valve Assembly
To remove the inlet water solenoid valve assembly:
1. Shut OFF water supply to machine.
2. Loosen and remove outlet water line from the inlet water solenoid valve assembly.
3. Remove screws and pull the water solenoid
REMOVAL OF THE
INLET WATER VALVE
INLET WATER
VALVE valve out to gain access.
4. Pull electrical cord from solenoid coil terminals.
5. Remove inlet water fitting from the water solenoid valve. To replace the inlet water valve assembly, reverse the removal procedures.
6. Reverse to reassemble.
Inlet Water
Valve Screen,
May Be
Cleaned As
Needed
Removal of The
Water Pump
October 1994
Page 27
CME650R
REMOVAL AND REPLACEMENT
Thermostatic Expansion Valve
1. Before replacing this valve, be certain that the valve is the cause of the problem, and cannot be adjusted.
2. Remove the top, service and front panels.
3. Discharge and recover the refrigerant.
4. Locate the TXV bulb (on the suction line), remove the clamps and bulb from the tube.
5. With the refrigeration system open, unsweat the
TXV from the tubing.
6. Place the new TXV in position.
7. Wrap the new TXV body with wet rags. Do not get any moisture in the valve.
8. Carefully braze the valve to the tubing. Examine the joints, if they look good proceed to the next step, if not, re-do them.
9. Install a new dryer, and braze it in place also.
10. Reattach the TXV bulb to the suction line in the same place as the old one.
11. Evacuate the system to 200 microns.
12. Weigh or measure the nameplate charge into the receiver.
13. If the machine has been off on the breaker there may be refrigerant trapped in the oil of the compressor, so do not restart until the compressor has been warmed by the crankcase heater for 12 hours. If the compressor was warm throughout the replacement process, the ice machine may be restarted without waiting to re-warm the compressor.
Hot Gas or Liquid Line Valve.
1. Before replacing this valve, be certain that the valve is the cause of the problem.
2. Remove the top, service and front panels.
3. Discharge and recover the refrigerant.
4. Unplug the coil of the valve.
5. With the refrigeration system open, unsweat the valve from the tubing.
6. Place the new valve in position.
7. Wrap the new valve body with wet rags. Do not get any moisture in the valve.
8. Carefully braze the valve to the tubing. Examine the joints, if they look good proceed to the next step, if not, re-do them.
9. Install a new dryer, and braze it in place also.
10. Plug the power cord back onto the coil.
11. Evacuate the system to 200 microns.
12. Weigh or measure the nameplate charge into the receiver.
13. If the machine has been off on the breaker there may be refrigerant trapped in the oil of the compressor, so do not restart until the compressor has been warmed by the crankcase heater for 12 hours. If the compressor was warm throughout the replacement process, the ice machine may be restarted without waiting to re-warm the compressor.
FRONT SEATED VALVE
SERVICE PORT
Refrigerant:
NO liquid refrigerant may be put into this system anywhere except the receiver. DO NOT use the valves at the front of the machine for weighing in the charge: use the “king” or receiver service valve. All liquid HP62 must be weighed into the receiver through the “front seated” receiver outlet service valve.
March 1994
Page 28
CME650R
REFRIGERATION SERVICE: R-404A
THIS ICE MACHINE USES HP62 REFRIGERANT
AND POLYOLESTER COMPRESSOR OIL
DO NOT USE MINERAL OIL IN THIS
REFRIGERATION SYSTEM.
••
HP62 is a "Near Azeotrope", and therefore liquid charging is required.
¤
Weigh as much of the charge as liquid into the receiver as possible.
¤
Install a sight glass between the suction service valve and the gage manifold. Use the manifold valve to "flash off" liquid before it enters the ice machine’s refrigeration system.
••
When the system is serviced, a special liquid line dryer is required (see parts list).
••
Polyolester oil absorbs water very easily, and therefore when the system is opened for service, it must be re-sealed as soon as possible (15 minutes maximum).
••
Special leak detection equipment is required to locate small refrigerant leaks. Usually a leak detector capable of detecting a Halogenated refrigerant or HFC-134a will work. Check with the leak detector manufacturer if in doubt.
••
As with any other refrigerant, do NOT mix HP62 with pressurized air when leak testing.
Pressure-Temperature Chart for HP62
VAPOR VAPOR
TEMP. PRESSURE TEMP. PRESSURE
(DEG F) (PSIG) (DEG F) (PSIG)
-20 . . . . . . 17 70 . . . . . . . 146
-18 . . . . . . 18
-16 . . . . . . 20
-14 . . . . . . 21
-12 . . . . . . 23
-10 . . . . . . 24
-8 . . . . . . . 26
-6 . . . . . . . 28
-4 . . . . . . . 29
-2 . . . . . . . 31
0 . . . . . . . 33
2 . . . . . . . 35
4 . . . . . . . 37
6 . . . . . . . 39
8 . . . . . . . 41
10 . . . . . . . 43
12 . . . . . . . 46
14 . . . . . . . 48
16 . . . . . . . 50
18 . . . . . . . 53
20 . . . . . . . 55
22 . . . . . . . 58
24 . . . . . . . 60
26 . . . . . . . 63
28 . . . . . . . 66
30 . . . . . . . 69
32 . . . . . . . 72
34 . . . . . . . 75
36 . . . . . . . 78
38 . . . . . . . 81
40 . . . . . . . 85
42 . . . . . . . 88
44 . . . . . . . 91
46 . . . . . . . 95
48 . . . . . . . 99
50 . . . . . . . 102
52 . . . . . . . 106
54 . . . . . . . 110
56 . . . . . . . 114
58 . . . . . . . 118
60 . . . . . . . 123
62 . . . . . . . 127
64 . . . . . . . 132
66 . . . . . . . 136
68 . . . . . . . 141
72 . . . . . . . 150
74 . . . . . . . 155
76 . . . . . . . 161
78 . . . . . . . 166
80 . . . . . . . 171
82 . . . . . . . 177
84 . . . . . . . 182
86 . . . . . . . 188
88 . . . . . . . 194
90 . . . . . . . 200
92 . . . . . . . 206
94 . . . . . . . 212
96 . . . . . . . 219
98 . . . . . . . 225
100 . . . . . . 232
102 . . . . . . 239
104 . . . . . . 246
106 . . . . . . 253
108 . . . . . . 260
110 . . . . . . 268
112 . . . . . . 275
114 . . . . . . 283
116 . . . . . . 291
118 . . . . . . 299
120 . . . . . . 307
122 . . . . . . 316
124 . . . . . . 324
126 . . . . . . 333
128 . . . . . . 342
130 . . . . . . 351
132 . . . . . . 360
134 . . . . . . 370
136 . . . . . . 379
138 . . . . . . 389
140 . . . . . . 399
142 . . . . . . 409
144 . . . . . . 420
146 . . . . . . 430
148 . . . . . . 441
150 . . . . . . 452
152 . . . . . . 464
154 . . . . . . 475
156 . . . . . . 487
158 . . . . . . 499
October 1994
Page 29
CME650R
REFRIGERATION SERVICE
General Information: Access Valves: To use the access valves:
Scotsman recommends that any work on the refrigeration system only be done when it is certain that the system needs repair. Use conservation
minded service procedures:
••
Refrain from checking refrigeration pressures without reason.
There are many ways to determine the proper operation of a
Scotsman ice machine without using refrigerant gauges. Visual inspection of the water system, observation of the ice formation, amp draw, voltage, and other techniques will lead to proper diagnosis. Scotsman also recommends that, at the time of initial start up, gauges not be used.
••
If gauges must be used, do not always check the high side pressure. If the condenser is clean and seems to be operating correctly, it most likely is. The low side pressure is much more important on an ice machine than is the high
Allen
Wrench side.
••
If gauges must be used, use very short hoses.
Minimal refrigerant discharged into the hoses equals minimal refrigerant discharged into the air.
••
Refrigerant should not be added except as a way to determine the proper operation of the product. If the system was low on refrigerant, there is a leak, and it must be found and repaired.
••
This system has a critical charge, it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer.
••
Anytime the refrigeration system has been opened, the dryer should be replaced.
Note:
Only a HFC type dryer should be used.
••
When brazing the tubing connections to components such as the hot gas valve, the component must be protected by heat sink material.
Recover, reclaim or recycle refrigerant. The method chosen is up to the service company.
There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700-88. Reclaim programs are available through most refrigerant wholesalers.
Remove the cap from the stem, use a 3/16" allen wrench to check that the valve is CLOSED. The remove the core cap.
Close the valve and replace the caps when the job is finished. The valve must be closed and the caps must be on or the valve will leak.
Torque Stem Cap to
8-12 ft. lb.
Torque Stem to
6-8 ft. lb.
Torque
Core Cap to
7-12 ft. lb.
Access Valves
Note: There are no valve cores in this valve.
March 1994
Page 30
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Table of contents
- 1 INTRODUCTION
- 2 FOR THE INSTALLER
- 5 FOR THE INSTALLER: Remote Condenser
- 6 FOR THE INSTALLER: Coupling Instructions
- 7 FOR THE ELECTRICIAN
- 10 FOR THE PLUMBER
- 11 FINAL CHECK LIST
- 12 COMPONENT LOCATION
- 13 COMPONENT DESCRIPTION
- 15 INITIAL START UP
- 17 FREEZING CYCLE OPERATION
- 18 HARVEST CYCLE - HOT GAS BYPASS
- 19 CLEANING & SANITIZING
- 21 SYSTEM SPECIFICATIONS
- 22 ADJUSTMENTS
- 23 SERVICE DIAGNOSIS: Water
- 24 Adjustments
- 25 Mechanical
- 26 REMOVAL AND REPLACEMENT
- 29 REFRIGERATION SERVICE: HP