Service manual

ManualsBrandsScotsman ManualsIce MakerCME650R

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

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

FOR THE INSTALLER: Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FOR THE INSTALLER: Coupling Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

FINAL CHECK LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

COMPONENT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

COMPONENT DESCRIPTION: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

INITIAL START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

FREEZING CYCLE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

HARVEST CYCLE - HOT GAS BYPASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

CLEANING & SANITIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

SYSTEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

SERVICE DIAGNOSIS: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

SERVICE DIAGNOSIS: Electrical and/or

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

SERVICE DIAGNOSIS: Refrigeration and/or

Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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.

CME650R

October 1994

Page 1

Summary of content (30 pages)

PAGE 1
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 FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 2
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 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.
PAGE 3
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.
PAGE 4
CME650R Installation Assembly: Bin Thermostat Installation 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. Thermostat Capillary Tube 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.
PAGE 5
CME650R FOR THE INSTALLER: Remote Condenser Locate the condenser as near as possible to the interior location of the ice maker. Precharged Line Routing 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. Do not connect precharged tubing until all routing and forming of the tubing is complete.
PAGE 6
CME650R FOR THE INSTALLER: Coupling Instructions ////////////////////////////////CAUTION///////////////////////////////// Final Connections: The couplings on the sets of precharged lines are self sealing when installed properly. Carefully follow the instructions: 3.
PAGE 7
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.
PAGE 8
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. 3.
PAGE 9
CME650R 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).
PAGE 10
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.
PAGE 11
CME650R 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. FINAL INSTALLATION 6.
PAGE 12
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.
PAGE 13
CME650R COMPONENT DESCRIPTION: Control System Cube Size Control Timer - Timer & Switch Assembly 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.
PAGE 14
CME650R COMPONENT DESCRIPTION: Water System Water Inlet Solenoid Valve Water Distribution System 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. The water distribution system evenly supplies water to all cells of the evaporator plates.
PAGE 15
CME650R INITIAL START UP Before Start Up: FRONT VIEW OF TIMER MICROSWITCH ACTUATOR BUTTON 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. CAM 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.
PAGE 16
CME650R INITIAL START UP CUBE SIZE DIAGRAM 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. JUST RIGHT When the cubes are the correct size, they will be connected together vertically, and drop off in strips.
PAGE 17
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.
PAGE 18
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.
PAGE 19
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. 11. Pour 1⁄2 gallon of the solution mixed in step 10 into the reservoir.
PAGE 20
CME650R CLEANING Remote Condenser To remove scale: 1. Shut off the ice machine. 1. Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of hot (950 F. to 1100F.) water. The fan blade can cause personal injury. Disconnect power before beginning to clean condenser. 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.
PAGE 21
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 @ 0oF. condenser, 70oF. air and 55oF. water • 15-17 minutes @ 90oF. condenser, 90oF. air and 70oF. 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 @ 90oF. condenser, 90oF. air and 70oF.
PAGE 22
CME650R ADJUSTMENTS To Adjust The Timer & Switch Assembly: MICROSWITCH Electrical power present in the control box can cause personal injury. Disconnect power before beginning to adjust timer. CLOSE UP VIEW OF TIMER SWITCH ACTUATOR CAM 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.
PAGE 23
CME650R SERVICE DIAGNOSIS: Water SYMPTOM No ice is made Cubes are not uniform in shape Long Freeze Cycle Makes thick ice/freezes up Cubes too large Low Capacity Unit runs out of water POSSIBLE CAUSE Inlet water valve will not open or is dirty No water being pumped over evaporators.
PAGE 24
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.
PAGE 25
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 PROBABLE FIX Check for power to the coil, check for not opening, replace Head pressure control valve does Replace head pressure control valve. not maintain enough head pressure.
PAGE 26
CME650R REMOVAL AND REPLACEMENT Cube Size Control To remove the cube size control: 1. Remove front panel. Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. 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.
PAGE 27
CME650R REMOVAL AND REPLACEMENT Inlet Water Solenoid Valve Assembly Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. 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 INLET WATER VALVE Water Pump 1. Remove front panel. 2. Unplug water pump electrical connection.
PAGE 28
CME650R REMOVAL AND REPLACEMENT Thermostatic Expansion Valve Hot Gas or Liquid Line Valve. 1. Before replacing this valve, be certain that the valve is the cause of the problem, and cannot be adjusted. 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. 3. Discharge and recover the refrigerant. 4. Unplug the coil of the valve. 4.
PAGE 29
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.
PAGE 30
CME650R REFRIGERATION SERVICE General Information: Access Valves: To use the access valves: Remove the cap from the stem, use a 3/16" allen Scotsman recommends that any work on the wrench to check that the valve is CLOSED. The refrigeration system only be done when it is certain remove the core cap. that the system needs repair. Use conservation minded service procedures: Close the valve and replace the caps when the • Refrain from checking refrigeration job is finished.