Service manual

ManualsBrandsScotsman ManualsIce MakerSLC400

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 repair this

product.

The SLC400 is an ice machine that produces

cubed ice on 6 vertical cube freezing surfaces.

When harvested, the cubes fall individually into the

ice storage bin. The SLC400 automatically

maintains the level of ice by turning on when the

ice level falls, and switches off when the bin is full.

The refrigeration system uses R-502 as the

refrigerant.

Table of Contents

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3

Installation

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4

Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

SLD dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . page 6

RS or IS dispenser . . . . . . . . . . . . . . . . . . . . . . . . page 7

Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10

Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11

Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14

Water/ Refrigeration Schematic . . . . . . . . . . . . . . . . . . . . . . . . . page 16

Technical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 19

Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . page 21

Parts lists and wiring diagrams are located in the center of this manual, printed on yellow paper.

Note the warning symbol where it appears in this

manual. It is an alert for important safety

information on a hazard that might cause serious

injury.

Keep this manual for future reference.

This manual was printed on recycled paper.

SLC400

November 1994

Page 1

Summary of content (24 pages)

PAGE 1
SLC400 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 repair this product. The SLC400 is an ice machine that produces cubed ice on 6 vertical cube freezing surfaces. When harvested, the cubes fall individually into the ice storage bin.
PAGE 2
SLC400 Specifications Information regarding Model Number, Serial Number, Ampacity and Maximum Fuse Size are located on the nameplate of the ice machine. The model number, serial number and refrigerant charge are also listed on the serial number plate just behind the front panel. Nameplate Serial Number Plate If recharging, always use the charge listed on the ice machine.
PAGE 3
SLC400 For The Installer: Environmental Limitations The ice machine must be installed indoors in a controlled environment. Minimum Maximum 0 Air Temp 55 F. 1000F. Water Temp 400F. 900F. Water Pressure 20 PSI 60 PSI Voltage 126.5 103.5 Operating the ice machine outside of the above limitations, or outdoors, is potentially damaging to the machine, and it is misuse of the machine. This may void the warranty.
PAGE 4
SLC400 Installation Water Location 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 5
SLC400 Installation: Ice Storage Bin Assembly: Stacking: 1. Attach the legs, or optional casters, onto the ice storage bin. Units that are stacked should only use legs, not casters. This machine will stack onto any SLC300 or SLC400. Note: Do not use casters when stacking. 2. Be sure that the top edge of the bin has a good gasket on it. 3. Place the ice machine onto the storage bin. 4. Line up the ice machine, check that there is a good seal between the ice machine and the storage bin. 5.
PAGE 6
SLC400 Installation: SLD150 Hotel Dispenser Assembly The ice machine must be placed onto the top of the dispenser, and the bin thermostat capillary tube routed into the bracket in the dispenser. 1. Check that the dispenser has a gasket all around the perimeter of the top, 22" wide by 23" deep. 2. Locate the inlet hole of the thermostat bracket, and make sure that it is open. 3. Place a corner post from the ice machine carton at the front of left and right sides of the hotel dispenser top. 4.
PAGE 7
SLC400 Installation: Scotsman IS or RS Dispenser Assembly: The assembly of the ice machine onto the dispenser requires two additional parts: an adapter kit and a thermostat stand off kit. 1. Mark two spots on the inside left liner of the dispenser: 2" down from the top, 4" from the back, and 4" apart. 7. From the adapter kit, place the stainless steel adapter onto the top of the dispenser. Follow all directions included with the kit. 8.
PAGE 8
SLC400 Installation For The Plumber Supply: Screw the 3/8" male flare (fitting shipped in package inside cabinet) into the 1/4" FPT fitting at the back of the cabinet (thread tape recommended). Connect cold potable water to the water inlet. A hand shut off valve for inlet water should be installed near the machine. A water filter is recommended. Flush the water line prior to connecting to the ice machine. Traps in the bin drain line without vents ahead of them will cause poor draining.
PAGE 9
SLC400 Installation For The Electrician This unit must be on a separate 115 volt AC 60 cycle single phase power supply. The maximum fuse size for this circuit is listed on the nameplate, and per the nameplate use fuses, or HACR circuit breakers. Follow All Local Codes - This Unit Must Be Grounded. Usually a licensed electrician will be required to connect the electrical service. To make the electrical connections: 1. Remove the right top panel. 2. Remove the junction box cover. 3.
PAGE 10
SLC400 After Utility Connections 1. Level the cabinet, use the leg levelers on the end of the legs to adjust the cabinet height. (Legs should have been installed when the bin was unpacked). 2. Wash out the bin. If desired, the interior of the bin could be sanitized. Final Check List 1. Is the ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified? 2. Has the water supply been connected? 3. Is the water pressure adequate? 4.
PAGE 11
SLC400 Component Location Many components are serviceable from the front without removing the side panels.
PAGE 12
SLC400 Initial Start Up After the final check list has been gone through, the ice machine may be started up. Ice Size Adjustment 1. Open the water shut off valve; the inlet water valve will open, and water will flow into the reservoir.. 2. Switch on the electrical power. 3. Remove the front panel. 3. Locate the ICE/OFF/WASH switch, switch it to WASH. Ice Thickness Probe Adjustment Plate: Move UP for Larger Cubes, DOWN for Smaller Cubes Set Screws 4.
PAGE 13
SLC400 Initial Start Up Note: If the first batch of cubes are not all uniform discs, some ice machine cleaner should be added to the reservoir. 1. After ice has been harvested, but before new cubes begin to form, switch the ICE/OFF/WASH switch to WASH. 2. Add 4 oz. of ice machine cleaner to the reservoir. Allow unit to operate that way for 10 minutes. 3. Switch ICE/OFF/WASH switch to OFF 4. Shut the water supply off. 5. Remove the splash guard, and drain the reservoir by removing the drain elbow. 7.
PAGE 14
SLC400 Maintenance, Cleaning and Sanitizing Cleaning Schedule: • Scrub the outside of the cabinet once a week with soap and water. • Sanitize the bin interior once a month. • Clean the water system and air cooled condenser a minimum of twice per year. If in an area of high mineral concentration in the water supply, clean water system 4 times a year. Inlet Water Valve Screens If a restriction of incoming water is suspected, the screen on the inlet side of the water valve should be inspected & cleaned.
PAGE 15
SLC400 Cleaning: Ice Machine Water System 15. Shut the water supply off by pushing the water valve button in. Dissolve and Remove Minerals: 1. Remove front panel. 16. Drain the water from the sump by removing the drain elbow. 2. Move the ICE/OFF/WASH switch to OFF. 3. Remove the splash guard. 4. Shut the water supply off by pushing the water valve button in. 5. Drain the water from the sump by removing the drain elbow. 6.
PAGE 16
SLC400 Refrigeration Schematic: Freeze Cycle: Water Schematic: From the compressor, hot discharge gas is pumped to the condenser, either air or water cooled. Water flows into the ice machine from its inlet connection at the back of the cabinet, through the inlet water valve and into the reservoir. The water in the reservoir is pumped up and through the water distributor tube at the top of the evaporators. From there, the water flows over both sides of the evaporators and back into the reservoir.
PAGE 17
SLC400 Harvest Cycle: During the Harvest Cycle, the water level rises, filling the reservoir over the siphon tube and siphoning some of the reservoir water out to the drain. The ice maker continues to freeze the water into ice until the ice next to the ice size thermostat probe has become thick enough to force water over the probe. After the cold water has reduced the temperature of the probe to 380F., the ice size thermostat will switch the machine into the harvest cycle.
PAGE 18
SLC400 Technical Characteristics Typical Cycle Time • 16 minutes @ 90oF. air and 70oF. water; 13 minutes @ 70oF. air and 50oF. water Typical Harvest Ice Weight • 3.6 pounds . Typical Low Side Pressure • 18-20 PSIG just before harvest Typical Freeze Cycle Discharge Pressure • 190 - 240 PSIG @ 70oF. air and 50oF. water • 250 - 290 PSIG @ 90oF. air and 70oF.
PAGE 19
SLC400 Service Diagnosis: SYMPTOM No ice is made, nothing operates No ice, compressor off No ice is made, compressor is operating POSSIBLE CAUSE Unit off, due to no power Unit off, due to ICE/OFF/WASH switch in OFF position Unit off, due to bin thermostat open PROBABLE FIX Restore power Switch ICE/OFF/WASH switch to ICE Check temperature at bin thermostat bracket, if warmer than 40o F., thermostat should be closed. Adjust/replace thermostat.
PAGE 20
SLC400 Service Diagnosis: SYMPTOM No ice compressor is operating POSSIBLE CAUSE No cooling due to low refrigerant charge Ice is made, but not harvested. Ice size thermostat contacts do not switch position Ice will not slide down ice rack due to minerals on rack. Ice will not slide down ice rack due to ice rack out of position Ice will not slide down ice rack due to bent ice rack Lack of heat during harvest cycle due to unit in air temp. less than 550F.
PAGE 21
SLC400 Service Diagnosis: SYMPTOM Ice is made, but will not harvest POSSIBLE CAUSE Will not harvest due to hot gas valve not opening. Slow/incomplete harvest due to hot gas valve not fully open. Makes ice, but very little Cubes are wrong size/shape High discharge pressure, due to dirty condenser; faulty fan motor; not enough water thru water cooled condenser, high water temperatures, water reg. valve set too high.
PAGE 22
SLC400 Removal and Replacement Ice Size Thermostat: Primary Resistor (Heater) Before replacing the ice size thermostat, it should be positively determined that it is at fault. 1. Disconnect electrical power. 1. Disconnect electrical power. 2. Disconnect the primary resistor’s yellow wire from terminal #4 and the white wire from terminal #1. Pull the two wires out of the control box and thru the insulated wall. 3. Mark location of probe tube bracket. Electrical shock hazard.
PAGE 23
SLC400 Removal and Replacement Water Pump Inlet Water Valve The pump provides the force to move the water from the reservoir to the freezing surface. The pump does not need oil, but if it becomes noisy, overheats, or will not pump it should be replaced. Be certain to confirm electrical faults with a voltmeter or ohmmeter before replacing the pump. The pump should be operating whenever the machine is in the freeze cycle.
PAGE 24
SLC400 Removal and Replacement: Refrigeration System General: • Scotsman recommends that any work on the refrigeration system only be done when it is certain that the system needs repair. • 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. • Refrigerant must not be vented to the atmosphere.