Scotsman Ice AFE325 User Manual

AFE325 Product Manual

Page 1

AFE325

Purpose of this manual: To provide detailed installation and operation instructions; to give insights into how the machine works; to list possible causes for problems; and to suggest procedures for specific types of service.

The AFE325 is an ice maker that makes and stores flaked ice.

The refrigeration system is either air or water cooled, and it uses R-134a as a refrigerant. The control system uses thermostat as a bin control and a water pressure switch as the water safety control.

Table of Contents

Specifications: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

To The Installer: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

For The Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

For The Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Final Check List & Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

User Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Component Location: Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Refrigeration System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

Water System Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

Mechanical Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Sanitation and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance And Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

Maintenance: Air Cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

Maintenance: Component Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16

Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

Water Seal & Bottom Bearing Replacement: . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19

Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

Gear Reducer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21

Gear Reducer Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

A Parts List and Wiring Diagram are located in the center of this manual, printed on yellow paper.

August 1994

AFE325

Page 2

Specifications:

The finish for this machine is either painted enamel or stainless steel. No panel kit is available to convert an enamel machine to stainless steel.

Scotsman ice machines, like the AFE325, are designed to be installed indoors, in a controlled environment. The minimum and maximum operating conditions are:

•Minimum Air Temperature:

•Maximum Air Temperature:

100

•Minimum Water Temperature:

•Maximum Water Temperature:

100

•60 Hz Voltage may vary between

104 and 126 volts.

•Water Pressure may vary

between 20 and 80 psi.

Operating the machine outside these conditions constitutes misuse and voids the warranty.

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 parts and/of 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

Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of UL, NSF and CSA.

Model Dimensions Basic

AFE325AE-1A AFE325AE-6A

H’ x W" x D"

33 x 36 33 x 36

⁄16 x 24

Electrical 115/60/1 Air Cooled 10.7 15 11 oz.

230/50/1 Air Cooled 5.4 15 11 oz.

Condenser Type

Min. Circ. Ampacity

Max. Fuse Size

Refrigerant Charge (R-134a)

August 1994

To The Installer:

Page 3

AFE325

A professional installation of any product is critical to the long term satisfaction of the user. The AFE325 is designed to be installed indoors, near a drain. Determine the location from the anticipated use and any options planned for.

This air cooled machine blows air out the back and left sides of the cabinet. Do not install the machine where the air flow might be blocked.

The machine will require electrical power, water and a drain. Follow all local codes. Rough in the utilities before placing the machine into position (see For The Electrician and For The Plumber).

After uncrating, install the legs or optional casters. If the building’s drain is a floor drain near the machine, the cabinet can be placed on the floor and sealed around the edges.

Place the cabinet in the place where it will be operating. Note that the electrical and water connections need to be made.

Level the unit front to back and left to right.

Water Quality: The quality of the water supplied to the machine

will directly affect the purity of the ice and the reliability of the machine. While the condition of the water supplied to a building is normally out of the control of the user, water can be treated at the point of use.

There are two major types of water impurities: suspended solids (those that are carried along with the water and may be filtered out) and dissolved solids (those that are part of the water and have to be treated). A water filter is always a good idea, but does require regular maintenance to change the cartridge. In some water conditions, water treatment may be required. Generally this means a polyphosphate feeder of some kind. Water softeners are not recommended for the AFE325.

Utility

Connections

Here

Nameplate Is Located

On The Back Panel.

Warm Air

Out

Airflow Direction

Cool Air In

Warm Air Out

August 1994

AFE325

For The Plumber

Drains: The ice maker requires a gravity drain for the reservoir overflow and bin drain. The pitch on the drain tubes must be at least 1/4 inch fall per foot of horizontal run. On long horizontal runs, a vent at the back of the cabinet will improve draining, and is recommended.

Water supply: Connect cold, potable water to the machine. A

hand valve near the location is recommended. A water filter is also a good idea.

Follow all local codes.

There are two drains and one water inlet connection to make.

The drains are: a copper bin drain tube; and a rubber reservoir overflow tube.

The water inlet connection is a 3/8" male flare. Route a drain line to the reservoir overflow drain

hose. Route a separate drain to the bin drain tube. Route the inlet water line to the fitting on the

corner post.

Water Inlet

3/8" Male Flare

Drain

⁄

" I.D. Flexible Hose

January 2005

Page 4

For The Electrician

Page 5

AFE325

Electrical connections:

Follow All Local, State & National Codes

Check the nameplate for voltage and current requirements. An electrical cord is not supplied. Connect the AFE325 to a separate electrical circuit. Wiring to the machine must conform to all codes. A licensed electrician may be required in some situations. The electrical connection is made in the control box inside the machine.

This unit must be grounded.

Route the electrical power cord thru the corner post to the control box inside the cabinet.

Top Panel

Ice Discharge Tube

(Ref)

Electrical

Inlet

To make the electrical connection, remove the following parts:

•Top panel

•Bin door

•Rubber moulding

•Left moulding cover

•Left track

•Upper front panel

•Upper baffle

•Left side panel

•Front louvered panel

•Control box cover

If the machine will be started up later, after making the electrical connections, replace all panels.

Control Box Cover

Upper Front

Panel

Left Side

Panel

Serial Number

Plate

Bin Door

Spacer

Bin Door

Left Track

Left Moulding

Cover

Upper BaffleFront Louvered

August 1994

AFE325

Page 6

Final Check List & Initial Start Up

1. Is the machine located indoors where the temperature limitations are not exceeded?

2. Is there at least 6" clearance on the left side and the back of the cabinet for adequate air flow?

3. Is the water supply adequate, and has a shut off valve been installed?

4. Is the cabinet level?

5. Have all of the electrical and drain connections been made?

Note: For High Altitude Installations an Altitude

Adjustment May Be Required:

(11-0354-01, 20 Ranco brand bin thermostats only)

Adjustment Altitude (ft.

above seal level)

Range Screw CW

2,000 35 4,000 90 6,000 145 8,000 190

Amount of adjustment from factory setting

o o

Initial Start Up

1. Remove the following parts:

•Top panel

•Bin door

•Rubber molding

•Left molding cover

•Left track

•Upper front panel

•Upper baffle

•Left side panel

•Front louvered panel

•Control box cover

•the top panel.

2. Open the water shut off valve.

3. Watch the water fill the reservoir. Check that it flows in and fills the reservoir near to the mark molded into the side of the reservoir. Check that the float shuts off the water flow when the tank is full. Check for leaks. Tighten hose clamps as needed.

4. Plug the unit in or switch on the electrical power.

5. Switch the master switch to ON.

6. Let the machine operate, listen for any unusual noises. If needed, reposition tubing & panels to eliminate vibration.

After the unit has been operating for about 10 minutes, there should be enough ice in the bin to test the bin thermostat.

7. Pick up some ice and hold it up against the bottom of the ice thermostat tube.

8. After a short time the bin thermostat should switch the machine off.

9. Pour water into the bin and check that the drain does not leak but drains the water rapidly.

10. Replace all panels.

11. Explain to the user the maintenance requirements and operation of the machine.

12. Fill out the Warranty Registration and Customer Evaluation form. Mail it to Scotsman.

13. Leave the service manual with the owner/user and explain who should be called if service is needed.

August 1994

User Operation

Page 7

The AFE325 is an automatic ice flaked machine. All it requires is cool air, clean water, a drain, and an adequate supply of electrical power.

The user must regularly sanitize and clean the machine.

Component Location & Function Evaporator. This is a vertical cylinder full of water

and refrigerated. Also in the cylinder is a slowly rotating auger. The auger forces the ice up the evaporator walls and compresses it at the top. The resulting flaked ice then falls by gravity into the ice storage bin.

Water Reservoir. The water reservoir contains the inlet float valve and the water level sensor. The float valve controls the flow of water into the reservoir.

Water Pressure Cut Out Switch: The purpose of this switch is to stop the ice maker if the water supply fails.

AFE325

Condenser. The AFE325 uses an air cooled

condenser. It blows air out, away from the fan motor. The heat removed from the water is exhausted from the condenser.

Compressor. The refrigeration system compressor provides the force to move the refrigerant around the system.

Auger Drive. The auger drive is a direct drive gear reducer.

August 1994

AFE325

Page 8

Component Location: Control Box

Auger Delay Pressure Control: This pressure switch, connected to the low side of the refrigeration system, controls the auger drive motor.

On-Off switch: This toggle switch shuts off the machine. It is not a complete disconnect.

Bin Thermostat: This thermostat turns the machine on and off in response to changes in temperature of the capillary tube. It opens at 35 and closes at 45 on the inside of the ice chute.

F. The capillary tube is mounted

Toggle Switch

Auger Delay Pressure

Control

Terminal Strip

Bin Thermostat

Control Box

August 1994

Refrigeration System Operation

Page 9

AFE325

The AFE325 uses a forced draft air cooled condenser, capillary tube and hermetic compressor. The system uses R-134a as a refrigerant. High pressure, high temperature refrigerant is forced thru the condenser where it looses enough heat to condense. The high pressure liquid refrigerant then passes thru the capillary tube which causes a pressure drop in the evaporator. As the high pressure liquid refrigerant moves into the evaporator’s area of low pressure, the warm water and low pressure cause the refrigerant to evaporate and absorb heat from the metal walls of the evaporator. After the refrigerant has flowed thru the evaporator it goes back to the compressor thru the suction line as a low pressure vapor. At the compressor the cycle is repeated. The AFE325 uses a low side pressure control as a safety, it will shut the system down if the suction

pressure is too low for reliable operation.

Evaporator

System Characteristics:

Note: This ice machine has a sealed refrigeration system. Tap into the system ONLY when it’s absolutely necessary. After tapping in, recovery, repair, evacuation and recharging, the piercing valve must be removed and the system re-sealed.

Typical Low Side Pressure*: 7 - 10 PSIG Typical Discharge Side Pressure*: 130 - 165 PSIG Typical Auger Drive Motor Amps (60 Hz): 2.8 - 3.1 Auger Drive Output RPM (60 Hz): 9.6 System Refrigerant Charge: 11 Ounces of R-134a

* Pressures depend upon air and water temperatures. Numbers listed are for 70

air/50

F. water and 90oF. air/70oF. water.

Refrigeration System Schematic

Suction Line

Compressor

Capillary Tube

Drier

Air Cooled

Condenser

August 1994

AFE325

Page 10

Water System Operation:

The water system consists of a float valve and reservoir. The water level in the reservoir tank is the same level as that inside the evaporator. Building water supply flows to the float valve and the float valve opens to add water to the reservoir as water flows out to the evaporator.

Inside the evaporator there is a water seal. This seal is the type that has a rotating half and a stationary half. The area where the two seals touch are smooth flat surfaces. When the auger is installed in the evaporator, it forces the rotating half of the seal against the stationary half. The stationary half is spring-loaded and provides a firm pressure against the auger portion of the seal.

Reservoir

Float

Water Inlet

Water Line

Bin Drain

Clamp

Ice

Bin

Thermostat

Bracket

Grommet

Ice Tube

Spout

Evaporator Reservoir Overflow

Gear Reducer

Water System Schematic

August 1994

Mechanical Operation

Page 11

AFE325

ELECTRICAL SEQUENCE There are two circuits in the AFE325: one is a

series circuit with several switches connected in series to the compressor. The other is a parallel branch of the series circuit, controlling the gear drive motor.

•The series circuit begins at the terminal strip in

the control box. From there, the line side power is connected to the Master Switch.

•When the master switch is closed, the power is

then connected to the Spout Switch. This switch, located on the top of the ice chute, is closed unless the ice chute has overfilled with ice, it is a manual reset.

•The line side power is also connected, in a

parallel circuit, to terminal 1 of the Auger Delay pressure control. This pressure control, connected to the low side of the refrigeration system, is designed as a by-pass circuit to the auger drive motor whenever the low side refrigerant pressure is at it’s normal ice making range. At start up, the contacts between terminals 1 and 2 are open. The line side power does not pass any further through the auger delay pressure control, until the compressor starts, and the low side pressure drops.

•The next control the power is connected to is

the Low Water Pressure Control. This switch is designed 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 ice bin. It is open when there is ice on the portion of the control inside the ice bin. Closing of the bin thermostat begins the process of making ice, because the line side power now goes to the compressor, gearmotor, and if air cooled, the fan motor.

•Power is initially connected to the gearmotor

through contacts 3 and 2 of the auger delay pressure control. This causes the auger motor to start and run. At the same time, if the centrifugal switch on top of the gearmotor closes (meaning the motor is at full speed) the compressor is connected to the neutral side of the power supply, and the compressor begins to run.

•As the compressor runs, the low side or suction

pressure begins to fall, when it reaches a preset point, the contacts within it move, opening 3 and 2, then closing 1 and 2. The power for the gearmotor is then connected to a point in the series circuit ahead of the low pressure control, the low water pressure control and the bin thermostat, so that if any of these open, the gearmotor will continue to run, pushing ice out of the evaporator.

The refrigeration system uses a hermetic compressor (specifically designed for R-134a), forced draft air cooled condenser, capillary tube and vertical flaked ice evaporator. Inside the evaporator is a slowly rotating auger. The auger is supported by bearings at each end, and there is a face-type water seal above the bottom bearing. The auger is driven by a 1/10 HP direct drive gear reducer. The auger drive motor has a speed operated switch on it that will keep the compressor from operating if the auger motor is not turning at full speed.

Water flows from the building supply to the reservoir . Water from the reservoir is used to make ice.

The bin and reservoir overflow have separate drains.

August 1994

AFE325

Sanitation and Cleaning

Maintenance:

The water and ice making systems will need to be periodically sanitize d and de-min era lized . Th e air cooled condens er will also ne ed to be kept clea n. Detailed ins tru ctio ns are pro vided on page 14.

Schedule the sanitation, cleaning and de-mineralization on a regular basis to keep the ice clean an d the machine operating effi ciently

Water System:

The water system requires periodic sanitation and de-mineralization.

Schedule & Responsibi li ty:

A Sco tsman Ice System represe nt s a sizable investmen t of time an d mon ey in any compa ny’ s business . In order to receiv e the best ret urn for that investme nt, it MUST rece ive periodic maintenance.

It is the USER’S RESPONSIBILITY to see that the unit is properly maintained . The following is a list of recommended main tena nce that will help keep the machine running with a minimum of prob lems.

Maintenanc e an d Cleaning should be sched ule d at a minimum of twice per year .

ICEMAKING SYSTEM: In place cleaning

1. Check and clean any water treatment devices, if any are insta lled .

2. Remove screws and remov e the top and front panels.

3. Move the ON - OFF switch to OFF.

4. Ope n the door to t he ice stora ge bin, and remove the ice.

5. Remove the cover to the wate r reserv oir and block the float up.

6. Drain the water res ervo ir and free zer assembly.

7. Prepare the cleaning solution: Mix 4 ounces of Scotsman Ice Machin e Clea ne r with 1 hot water. The wat er should be between 90-115

Scotsman Ice Mac hine Cleaner conta ins aci ds. These compounds may cause burns.

If swallowed, DO NO T induce vomiting. Give large amounts of wat er or milk. Call Physician immediately. In case of external contact, flush with water.

KEEP OUT OF THE REACH OF CHILDREN.

⁄2 quarts of

8. Slowly pour the cleaning solu tio n into th e water reservoir until it is full. Wait 15 minutes, then switch the master switch to ON.

9. As the ice maker be gin s to use wat er fro m th e reservoi r, contin ue to add more clea nin g solu tio n to maintain a full reservoir.

10. After all of th e cle aning solution ha s been added to the reservoir, and the reservoir is nearly empty, switch the mast er switc h to OFF.

11. After draining the reservoir, as in step 6, wash and rinse the water rese rvo ir.

12. Go thru steps 13 - 18 to sanit ize th e ice machine wat er syst em.

13. Mix two gallons of sanitize r solution. Use an approved sanitizer.

A possib le san itzer solution may be obtaine d by mixing two gallons of warm (90-115 water with 1 ounce of household bleach.

14. Slowly pout the sanitizer solution into the water reservoir until it is full, then switch the mast er switch to ON.

15. As the ice machine uses wat er f rom t he reservoi r, continue to add sanitizing solution to keep the reservoir full.

16. After added to the reservoir, and the reservoir is nearly empty, s witch the master switch OFF.

17. Drain the reservoir and thoro ughly wash the interior of the res ervo ir and cover wit h sanit izer solution.

18. Remove the block from the flo at in the wate r reservoi r.

19. Switch the master switch to ON.

20. Continue ice makin g for at lea st 15 minu tes, to flush out any cleaning solution . Switch the mast er switch OFF.

DO NOT USE any ice produced from the cleaning solution. Be sure no ice remains in the bin.

21. Remove all ice from the stora ge bin.

22. Add warm water to the ice storage bin and thoroughly wash and rins e all surfac es with in th e bin.

23. Sanitize the bin int erio r by tho rou gh tly washin g all interior surf ace s of the bin with the balance of the sanitizer so lut ion .

24. Switch the master switch ON.

25. Replace th e top and the fro nt panels.

⁄2 of the sanitizer solutio n has been

F.) potable

January 1996

Page 12

Maintenance and Cleaning

Page 13

AFE325

In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected.

Note: Water filters can filter out suspended solids, but not dissolved solids. ‘‘Soft’’ water may not be the complete answer. Check with a water treatment specialist regarding water treatment.

For more information on removal of these parts, see REMOVAL AND REPLACEMENT.

To Inspect The Top Bearing:

1. Disconnect electrical power and shut off the water.

Electrical Shock Hazard

Disconnect electrical power before beginning.

To Inspect the Auger:

1. Disconnect electrical power and shut off the water.

2. Remove the two screws from the spout at the side of the evaporator. Pull the spout away from the evaporator.

3. Remove screw holding spout plate to evaporator.

4. Pull up on cap hook located in the top of the freezer assembly to remove the ice breaker assembly, auger, and the top portion of the water seal.

5. Inspect the auger and the water seal. Clean the auger of any mineral build up. Scotsman Ice Machine Cleaner and a scouring pad work well to clean the auger. DO NOT USE steel wool.

6. Replace the water seal, see the instructions under "Removal and Replacement".

2. Remove the two screws from the spout at the side of the evaporator. Pull the spout away from the evaporator.

3. Remove screw holding spout plate to evaporator.

4. Remove the snap ring and cap, and remove the bolt from the ice breaker and auger assembly to separate the ice breaker assembly from the auger. Pull the ice breaker with bearing out of the top of the evaporator: the auger should stay in the evaporator. The bearings may be inspected for rust, wear, and roughness. Reverse to reassemble.

August 1994

AFE325

Page 14

Maintenance: Air Cooled Condenser, Bearings

1. Disconnect electrical power.

Electrical Shock Hazard

Disconnect electrical power before beginning.

2. Remove front louvered panel

3. Wipe the lint off the front of the condenser. If needed, clean the interior of the condenser.

4. Use pressurized air to blow the lint from the inside of the condenser. A vacuum cleaner hose should pick up most of the dust. Check for interior dirt. If needed, use coil cleaner to de-grease the condenser.

5. Replace all panels and reconnect electrical power.

Auger and Bearing Inspection While in most areas regular in-place cleaning with

Scotsman Ice Machine Cleaner will be adequate to keep the interior of the evaporator free of excessive mineral build up, some water conditions may require more intense methods. In addition, the auger bearings require physical inspection to determine that they are not wearing. This physical inspection is recommended twice per year for the top bearing and once per year for the auger and both bearings.

Whenever the auger is removed, replacement of the water seal is recommended.

If a bearing requires replacement, the other bearing must also be replaced.

1. Unplug or disconnect electrical power.

2. Shut off the water supply.

3. Remove top panel.

4. Remove right side panel.

5. Drain the evaporator and reservoir.

6. Remove the two screws from the spout at the side of the evaporator.

7 Remove screw holding spout plate to evaporator.

8. Remove spout.

9. Pull up on the pull ring to remove the auger. If it is difficult to pull:

A. Remove the breaker cover by taking the snap ring out.

B. Unscrew the auger bolt. C. Use threaded rod or a slide hammer puller and

screw into the auger, slide the weight up against the stop to remove the auger.

If the auger still will not move, bearing replacement is mandatory. See Bearing Removal and Replacement.

August 1994

Maintenance: Component Inspection

Page 15

AFE325

Auger. The auger is made of stainless steel. It has

a polished surface that may be very shinny or dull. Allow the auger to dry, if mineral scale is found on the auger’s surface, clean off the auger with ice machine cleaner and a scrubbing pad.

Remove the water seal and clean off the shoulder of the auger.

Bearings: The top bearing should spin freely with no rough spots. If it feels rough when spun by hand, replace it. There should be minimal rust or dirt. If in doubt, replace the bearing.

The bottom bearing must be removed from the evaporator when replacing the water seal.

Remove the three bolts holding the evaporator to the gearmotor adapter and lift the evaporator up slightly. Tap the water seal and bottom bearing out from the top down. Check the bottom bearing the same way as the top.

Replace the water seal and install a new bearing set if needed.

To replace the water seal:

10. Push the auger down, and rotate the breaker until the screw hole lines up with the pilot hole in the evaporator.

11. When the auger is completely seated, reinstall the breaker screws.

12. Replace spout and rubber top.

13. Switch on the water supply.

14. Observe operation. The unit should make minimal noise while producing ice. Catch first 2 minutes of ice and discard it.

15. Replace all panels.

Coupling

Use the grease zerk on the side of the coupling to add grease once per year.

That concludes normal maintenance. If the fan motor has an oil plug, it may be oiled after 10 years of operation.

1. Remove old rotating half from the auger. Clean the mounting area.

2. Place a bead of food grade sealant (such as Scotsman part number 19-0529-01) onto the shoulder of the auger where the rotating half of the water seal will be installed.

3. Wash the new seal in water. While wet, slip it onto the bottom of the auger, rubber side toward the auger. Push up until seated against the sealant. Do not allow any sealant to come into contact with the face of the seal.

4. Wash the stationary half the water seal with water. Slip it up into the bottom of the evaporator until the bottom of the seal is inside the evaporator about 1/4".

5. Push the bottom bearing against the water seal until the bottom bearing is inside the evaporator about 1/16".

6. Replace the evaporator on the adapter, and re-attach the stand using the original bolts.

7. Attach the auger to the top bearing and breaker.

8. Return the auger to the evaporator and slide it down until the splines touch the coupling.

9. Rotate the auger until the coupling splines align with the auger.

August 1994

AFE325

Page 16

Service Diagnosis

Problem Possible Cause Probable Correction No ice, nothing is operating. Unit has no power. Restore power. If breaker or fuse

tripped, check for overloaded circuit or short circuit.

Master switch off Switch unit on. Determine why

switch was off.

No water (water safety switch open)

Spout switch open Check bin thermostat for failure to

Bin thermostat open Check air temp, it must be over

Auger drive motor will not start. Check windings of auger drive

Auger delay switch open Replace auger delay.

Restore water supply. Check filters or strainer.

open and shut off machine. Check spout for internal pitting.

F. for thermostat to start unit.

motor. Check for seized gears.

No ice, auger drive is operating. Centrifugal switch is open. Check/replace switch

Compressor will not start. Check voltage.

Check start relay Check start capacitor Check compressor

Lack of refrigerant Check system. Locate leak.

Recover remaining refrigerant, replace drier, evacuate to 200 microns and weigh in the system charge.

No condensing Fan not turning, or blade broken. Unit will not shut off. Bin thermostat stuck closed. Replace thermostat. Auger motor will not shut off. Auger delay stuck Replace auger delay

System pressures to low to switch

auger delay off.

Check pressures. If low, check for restriction or leak.

August 1994

AFE325

Page 17

Service Diagnosis

PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION

Unusual noise Mineral scale in evaporator Clean water system with ice

machine cleaner. Auger coupling dry Grease coupling Auger coupling worn Replace coupling and adapter

stand. Bearings worn Replace bearings and water seal. Gearmotor loose on frame Tighten bolts, check grommets Low water level Check water level in reservoir Tubing vibrating Check tubing for contact Tooth on a gear missing Check gears in auger drive Compressor too loud Replace compressor Gear noise Check gearmotor for oil leak

Water leaks from cabinet Evaporator water seal worn or

cracked Tubing to evaporator leaks Replace tubing/fittings Drain leaks Check drain tubes and fittings External drain restricted Clean out drain

No refrigeration Gearmotor does not turn Check motor

Centrifugal switch does not close Check switch Fan motor does not turn Check fan motor Lack of refrigerant Add refrigerant, if problem is

Compressor does not pump Check/replace start capacitor

Replace seal and bearings

reduced, locate leak and repair it.

Check/replace start relay

Check/replace compressor

August 1994

AFE325

Page 18

Removal and Replacement

Water System

The water system consists of the reservoir and inlet water valve.

Reservoir.

1. Shut off the water supply.

2. Remove the top panel.

3. Remove the left side panel.

4. Drain the water reservoir and evaporator.

5. Disconnect inlet and outlet tubes from the reservoir.

6. Remove screws holding reservoir to its mounting bracket.

7. Remove reservoir from the machine.

8. Reverse to reassemble.

Bearings, Water Seal and Auger

1. Disconnect electrical power.

4. Thread in a threaded rod and weight or slide-hammer puller into the auger.

5. Use the threaded rod & weight or slide hammer puller to remove the auger.

1. Remove three cap screws holding evaporator to the adapter stand.

2. Lift evaporator up slightly and tip the bottom out to expose the splined end of the auger.

3. Use a plastic mallet or dead-blow hammer to tap the bottom of the auger and force the auger up. Do NOT damage the splines of the auger or the auger will have to be replaced.

If the auger is "frozen" to the bottom bearing, do not force the bottom bearing thru the evaporator.

Replacement

1. Replace the bearings and water seal. Replace the auger if the splines are damaged. Replace the evaporator if more than 1/3 of the vertical rifle grooves are gone. Sand or hone and sand the inside of the evaporator if mineral build up is heavy.

Electrical Shock Hazard

Disconnect electrical power before beginning.

2. Shut off the water supply.

3. Remove the top panel.

4. Remove the front and side panels.

5. Drain the reservoir and evaporator.

6. Remove rubber cap from the top of the evaporator.

7. Remove the two bolts from the spout on the side of the evaporator.

8. Remove the screw holding the bearing retainer to the evaporator.

9. Pull up on the ring to lift the auger out of the evaporator.

If the auger will not lift out:

Top Bearing Replacement: If the inner race is secure, use an arbor press to

push the top bearing out of the breaker. If the inner race has separated from the bearing, replace the breaker.

Insert a new bearing in the breaker. Replace the "O" ring in the breaker. Push the bearing in, push only on the outer race.

1. Remove snap ring holding bearing cover to breaker.

2. Remove bearing cover.

3. Unscrew bolt holding bearing to auger.

August 1994

Water Seal & Bottom Bearing Replacement:

Page 19

AFE325

1. Remove old rotating half from the auger. Clean the mounting area.

2. Place a bead of food grade sealant (such as Scotsman part number 19-0529-01) onto the shoulder of the auger where the rotating half of the water seal will be installed.

4. Wash the stationary half the water seal with water. Slip it up into the bottom of the evaporator until the bottom of the seal is inside the evaporator about 1/4".

5. Push the bottom bearing against the water seal until the bottom bearing is inside the evaporator about 1/16".

6. Replace the evaporator on the adapter, and re-attach the stand using the original bolts.

7. Attach the auger to the top bearing and breaker.

Evaporator

Follow all steps to remove the auger & bearings.

1. Recover the refrigerant charge. Note: The refrigeration system must not remain open for more than 15 minutes.

2. Unsweat suction and cap tube connections.

3. Remove evaporator from the machine.

4. Remove old drier.

5. Install new evaporator.

6. Install new HFC type drier. Note: The refrigeration system uses an HFC type

refrigerant and MUST use an HFC type drier.

7. Braze the drier connections, cap tube and suction line together.

8. Evacuate to 200 microns, and weigh in the system charge.

8. Return the auger to the evaporator and slide it down until the splines touch the coupling.

9. Rotate the auger until the coupling splines align with the auger.

10. Push the auger down, and rotate the breaker until the screw holes line up with the pilot holes in the evaporator.

11. When the auger is completely seated, reinstall the breaker screws.

12. Replace permagum and foam top.

13. Switch on the water supply.

14. Check bin cover for electrical grounds and switch on the electrical power.

15. Observe operation. The unit should make minimal noise while producing ice. Catch first 2 minutes of ice and discard it.

16. Replace the bin cover and all panels.

Water Line

Coupling

Gasket

Gear

Reducer

August 1994

AFE325

Page 20

Refrigeration System

This ice machine uses R-134a as the refrigerant. This refrigerant has no chlorine, and therefore requires polyolester type refrigerant oil. This oil requires specific service procedures.

Service Recommendations:

This ice machine has a sealed refrigeration system. It must not be tapped into unless absolutely necessary. If access is required, tap into the "process" tubes (dead-end tubing that has been pinched-off and brazed shut).

After recovery, repair, evacuation and re-charging, remove the piercing valves:

1. Pinch off the process tube below the valve.

2. Remove the valve.

3. Braze the end of the tube shut. A HFC type liquid line drier is required. "Standard"

driers may not take out enough moisture and may affect the oil additives.

The time that the refrigeration system is open to the air must not exceed 15 minutes. The oil will rapidly absorb moisture from the air, and the contact time must be kept to a minimum.

A special or very sensitive electronic leak detector will be needed to locate refrigerant leaks. Many are on the market that will sense R-134a.

Recovery and vacuum equipment should use polyolester oil to minimize cross-contamination.

A HFC type drier must be used.

As with any other refrigerant, do not place pressurized air or oxygen into the refrigeration system.

Evacuation to 200 microns is recommended.

Temperature Pressure Chart, Selected Points

Temperature in

-10 2.0

-6 3.7

-4 4.6

-2 5.5 0 6.5 1 7.0 2 7.5 3 8.0 4 8.6 5 9.1 10 12.0 12 13.2 14 14.4 16 15.7 18 17.1 20 18.4 25 22.1 30 26.1 31 26.9 32 27.8 33 28.6 34 29.5 35 30.4 40 35.0 45 40.0 50 45.4 75 78.7 90 104.3 110 146.4 120 171.1 130 198.7 150 262.8

F. PSIG of R-134a

August 1994

Gear Reducer Removal

Page 21

1. Disconnect electrical power.

Electrical Shock Hazard

Disconnect electrical power before beginning.

2. Shut off the water supply.

3. Remove the top, front and side panel.

4. Remove the control box cover.

5. Remove the centrifugal switch cover on the top of the auger drive motor.

6. Disconnect the electrical wires from the centrifugal switch.

7. Drain the evaporator and reservoir.

AFE325

8. Disconnect the water inlet tube from the evaporator.

9. Remove the three screws holding the evaporator to the adapter stand.

10. Lift the evaporator up high enough for the auger to clear the adapter stand.

11. Remove the mounting bolts holding the gear reducer to the cabinet frame.

12. Trace auger drive motor wires back to the control box.

13. Disconnect the drive motor wires from the relay on the circuit board.

14. Pull the wires back to the auger drive motor.

15. Pull the gear reducer out the side of the cabinet to remove it from the machine.

Note: If there is evidence of water near the output shaft of the gear reducer, it would be a wise precaution to pull the auger from the evaporator and check the bearings.

16. Rebuild or replace the gear reducer.

August 1994

AFE325

Page 22

Gear Reducer Rebuild

1. After the gear reducer has been removed, the internal components may be inspected and/or replaced. Remove all bolts holding the two case halves together.

2. Tap against the roll pins at each end of the gear cases to split them.

3. Pry the case halves apart.

4. Check the internal condition of the gear reducer. If rusty or water is present, replace the complete assembly. The oil should be black and the proper oil level is 1/8" from the top of the biggest gear (with all gears installed). Check the input seal.

The gears may be replaced individually. Auger Drive Motor The windings or top bearing & cover may be

replaced without removing the evaporator or gear reducer from the machine.

1. Disconnect electrical power.

If the windings are to be replaced, remove the left side panel and control box cover.

1. Locate the auger drive motor wires plugged into a relay on the circuit board.

2. Disconnect the auger motor’s wires and pull them back to the auger drive motor.

3. Lift the auger motor windings off the gear reducer.

If the rotor needs to be removed:

1. Run a screw into the top of the rotor.

2. Grasp the screw with a grip pliers.

3. Pull and/or tap on the pliers to pull the rotor & bearing out of the gear reducer.

4. Inspect the bearing and input seal. Replace them if worn.

Note: When the rotor is re-installed, be certain that the bearing is fully seated in the gear case.

Electrical Shock Hazard

Disconnect electrical power before beginning.

2. Shut off water supply.

3. Remove top panel.

4. Remove right side panel.

5. Drain the reservoir and evaporator.

6. Disconnect the reservoir outlet tube from the bottom of the reservoir.

7. Remove screws holding reservoir mounting bracket to the cabinet.

8. Lift the reservoir up & away from the top of the auger drive motor.

9. Remove the 4 bolts holding the auger motor cover to the gear reducer case.

10. Lift the plastic switch housing off the auger drive motor.

11. Hold the centrifugal switch and remove the screw holding it to the rotor of the motor.

12. Lift the centrifugal switch up and off the motor.

13. Lift the motor cover up and off the motor.

14. Pull the fan up and off the rotor.

August 1994

Gear Reducer

Page 23

Motor Cover & Top

Rotor Bearing

Fan

AFE325

Shaft Seals, 2 are used per shaft as

shown

Stator

Woodruff

Key

Rotor

Spacer Washer,

Use To Adjust

Height of Gears to

Avoid Rubbing

First Gear

August 1994

Scotsman Ice AFE325 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual