Scotsman AFE424 Manual Download | Manualshive

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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 AFE424 is an ice machine that produces
flaked ice and stores it in a insulated bin. It
automatically maintains the level of ice by turning
on when the ice level falls and switches off when it
is full.

This unit in serviceable in place; the ice storage bin
and hood may be removed from the chassis to
allow service access without removing the ice
machine from its installed location. The
refrigeration system uses R-134a as the
refrigerant.

Keep this manual for reference.

AFE424

March 2012

Page 1

Table of Contents

Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2

For The Installer: Environmental Limitations · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3

Installation: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

Installation: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

Removal of the Cabinet · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7

Component Location · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8

Electrical Sequence

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9

Initial Start Up · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10

Maintenance and Cleaning · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11

Maintenance and Cleaning · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12

Maintenance and Sanitation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13

Water Schematic · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14

Refrigeration Schematic

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15

Service Diagnosis: Condition - No Ice Being Produced

· · · · · · · · · · · · · · · · · · · · · Page 16

Service Diagnosis: Condition - No Ice Being Produced

· · · · · · · · · · · · · · · · · · · · · Page 17

Technical Characteristics · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18

Removal And Replacement - Bin Thermostat

· · · · · · · · · · · · · · · · · · · · · · · · · · Page 19

Removal And Replacement - Gearmotor Assembly · · · · · · · · · · · · · · · · · · · · · · · Page 20

Removal And Replacement

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21

Water Seal Installation - all models · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 22

Removal And Replacement - Gearmotor Assembly · · · · · · · · · · · · · · · · · · · · · · · Page 23

Removal and Replacement - Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24

Removal and Replacement: Refrigeration System · · · · · · · · · · · · · · · · · · · · · · · · Page 25

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Summary of Contents for AFE424

Page 1: ...012 Page 1 Table of Contents Specifications Page 2 For The Installer Environmental Limitations Page 3 Installation Page 4 Installation Page 5 Installation Page 6 Removal of the Cabinet Page 7 Component Location Page 8 Electrical Sequence Page 9 Initial Start Up Page 10 Maintenance and Cleaning Page 11 Maintenance and Cleaning Page 12 Maintenance and Sanitation Page 13 Water Schematic Page 14 Refri...

Page 2: ...ical Ice Type Condenser Type Typical Amps Maximum Fuse Refrigerant Charge R 134a AFE424A 1 33 x 241 4 x 24 115 60 1 Flake Air 9 15 15 oz AFE424W 1 same same same same same same 9 oz AFE424A 6 33 x 241 4 x 24 230 50 1 Flake Air 9 15 15 oz A scoop and legs 6 are included SERIAL NUMBER PLATE The nameplate is located on the back panel A serial number plate is located behind the right grill in front of...

Page 3: ...of UL NSF and CUL 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 part 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 design are subject to change without notice Airflow on a...

Page 4: ...t 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 Have the water tested Either acidic water or alkaline water will cause corrosion Dissolved solids cannot be filtered out Check with a water treatment specialist regarding testing treatment and filters Note Deionized water is not recommended due to its poten...

Page 5: ... Drain tube material must be rigid and meet local code Traps in the bin drain line without vents ahead of them will cause poor draining The bin drain must be vented if there is a long horizontal run 5 or more All drains are gravity and must have a minimum fall of 1 4 per foot of horizontal run Maintain the air gap required by local code between the end of the drain tubes and the building drain rec...

Page 6: ... 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 Have the water connections been checked for water leaks 5 Have the drain connections been made 6 Have the drain connections been checked for leaks 7 Is the cabinet level 8 Is the ice machine plugged into an electr...

Page 7: ...until it can be lifted up Caution the door may be free to come out the back of the hood when removed from the cabinet base 4 To remove the cabinet base the hood must be removed first 5 Remove 4 screws and the two grills at the front of the base 6 In the area exposed when the grills are removed are two knobs similar to those removed in step 2 Unscrew and remove the two knobs 7 Locate bin drain Loos...

Page 8: ... Pressure Cut Out The pressure switch is designed to open and shut off the machine should the high side refrigeration pressure become too high usually as a result of not enough water through the water cooled condenser or a fan motor failure Air cooled is an automatic reset water cooled is a manual reset On Off switch This toggle switch shuts off the machine It is not a complete disconnect Bin Ther...

Page 9: ...esigned to open should the water pressure to the machine drop too low The next control is the Bin Thermostat It is closed when there is no ice on the portion of the control inside the thermostat bracket It is open when there is ice on the portion of the control inside the thermostat bracket Closing of the bin thermostat begins the process of making ice because the line side power now goes to the c...

Page 10: ...20 minutes Then pour clean water into the bin to melt the ice This will flush out most manufacturing or shipping materials that may have strayed into the water ice making system 7 Check the operation of the bin thermostat by placing ice over the sensing tube A properly operating bin thermostat will open when ice covers the sensing tube When the bin thermostat opens the compressor will stop but the...

Page 11: ... cold water or if torn or so dirty it can t be cleaned replace with a new filter 5 Return the filter to its installed position 6 Replace the bracket removed in step 2 7 Replace the grill Do not operate the unit without the filter in place Note If the unit has been operated without the filter in place the fins of the condenser will become fouled with dirt and must be cleaned Scotsman recommends tha...

Page 12: ...e float 18 Operate the unit for 15 more minutes then switch it off 19 Pour clean water into the bin to melt any ice produced during cleaning Sanitize Water System 1 Use a locally approved sanitizer or mix a sanitizing solution of 1 ounce of household bleach to 2 gallons of warm 95o F 115o F water 2 Disconnect drain hose from bin 3 Lift up on front of bin and rotate bin off of chassis 4 Remove cove...

Page 13: ...of household bleach to 2 gallons of water 2 Using clean rubber gloves and a clean cloth wipe all interior surfaces of ice storage bin hood and door with sanitizing solution Be sure and wipe the joint between the hood and bin with the sanitizing solution Use a clean brush to thoroughly swab all interior surfaces with the sanitizing solution 3 Reassemble and allow to air dry Stainless Steel Componen...

Page 14: ...e evaporator In the evaporator the water chills into ice crystals and is pushed up the evaporator by the auger At the top of the evaporator the ice is pressed against a restriction called a breaker and some of the water is squeezed out of the crystalline ice The flaked ice then flows through the chute into the bin AFE424 April 2010 Page 14 WATER SCHEMATIC WATER SAFETY SWITCH BIN DRAIN EVAPORATOR R...

Page 15: ...ic expansion valve the liquid refrigerant passes from a high pressure zone to one of relatively low pressure and in the low pressure zone it evaporates The low pressure zone where the refrigerant evaporates is the evaporator When the refrigerant evaporates it absorbs heat from the metal parts of the evaporator and the water inside it From the evaporator the refrigerant flows back to the compressor...

Page 16: ...d If open with no ice on it turn thermostat knob CCW if this does not close the thermostat replace it If the thermostat is closed and the unit will not start go to E E Check the water pressure to the unit The machine will not run if there is not enough water pressure Restore adjust water supply If the unit will not start with good water pressure go to F F Check that the Auger Delay contacts 3 2 ar...

Page 17: ...eplace those items found defective STATUS MAKES ICE BUT ALSO MAKES EXCESSIVE NOISE A Check if the unit has been cleaned recently it will make extra noise if minerals have stained the auger and or evaporator Clean it if in doubt B Check the coupling by greasing it C Check the bearings for wear D Check the evaporator for wear There are vertical ice guide marks machined into the evaporator s interior...

Page 18: ... 260 PSIG AC Typical Compressor Amp Draw Compressor amps should be about 6 7 Superheat 6 8o F Air Cooled Fan Motor 16 watt rating 1500 RPM CW Water Cooled Fan Motor 5 watt rating 1500 RPM CW Gearmotor 1 10 H P shaded pole motor 11 RPM output shaft speed Gearmotor amps will be about 2 8 3 2 Bin Thermostat 45o F cut in 35o F cut out minimum 61o F cut in 51o F cut out maximum Water Pressure Switch 10...

Page 19: ...wo screws holding the control to the control box 5 Lift the control out of the control box and pull the two wires off the controls posts 6 Follow the capillary tube of the bin thermostat and remove it from the grommet in the back of the control box 7 Pull the end of the bin thermostat from the tube holder 8 Pull the capillary back through the grommet in the evaporator bracket until free Remove the...

Page 20: ...vaporator and reservoir cover plate 3 Unscrew the bolts holding the gearmotor mounting plate to the ice machine chassis 4 Use a 1 2 box wrench to unscrew the three cap screws holding the evaporator to the gearmotor 5 Remove the motor and centrifugal switch electrical leads from their connections 6 Raise the evaporator assembly up enough that the output shaft clears the freezer adaptor 7 Remove the...

Page 21: ...and remove two permagum plugs on back of evaporator 6 Remove two phillips screws from the back side of the evaporator 7 Obtain a 1 1 2 pipe thread tee 8 Remove the sealing cap 9 Install the Tee it will screw onto the breaker which has 1 1 2 NPT threads 10 Pull up on the Tee or insert a bar thru the Tee and pull up on it to remove the auger and top bearing retainer When the auger is free the bolt h...

Page 22: ...he evaporator It must go in straight and must not be pushed in beyond 1 4 past the bottom of the evaporator 6 Install a new bottom bearing push it into the evaporator under the new water seal It must be pushed in straight but do not push it in past 1 8 from the bottom of the evaporator tube 7 Mount the adaptor stand to the bottom of the evaporator Hand tighten the three cap screws until the stand ...

Page 23: ...p screws into gearcase cover and torque at 80 90 inch pounds 4 Bench test the gearmotor assembly Test for noise amp draw must not be in excess of ice maker nameplate for gearmotor and oil leaks Return the gearmotor assembly to the unit Be certain all mounting surfaces are clean and reassemble to the gearmotor mounting plate Then bolt back onto ice machine chassis AFE424 April 2010 Page 23 GEARMOTO...

Page 24: ...n line tubes to the evaporator at the joints to the left of the evaporator 11 Raise the evaporator assembly up enough that the output shaft clears the freezer adaptor and remove the evaporator from the ice machine 12 After the evaporator has been removed from the ice machine the auger and bearings may be removed The fasteners auger and breaker cover should be saved for use in the new evaporator Ne...

Page 25: ...d be broken each time with dry nitrogen not refrigerant Evacuation must be from both sides of the system Weigh in or measure in the nameplate charge Recharge into the high side Check for leaks with a high quality electronic leak detector Halide torches will not locate the very small leaks If an ice machine is to be discarded and still contains refrigerant Scotsman recommends that the refrigerant b...

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