Scotsman MFE400 Installation Manual

Page 1
MFE400
INTRODUCTION
To the owner or user: The service manual you are reading 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.
TABLE OF CONTENTS
For the Installer
Location/Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Removal and Replacement
Ice Breaker and Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Gearmotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Parts lists and wiring diagrams are located in the center of this manual, printed on yellow paper.
May 1994
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Page 2
MFE400
FOR THE INSTALLER
The MFE400 is designed to fit the following Scotsman storage bins.
BH550 with bin top KBT20 HTB555 with bin top KBT20
When installing the new system, check that everything needed is on site:
Correct Ice Machine (voltage and type) Correct Bin
Correct Bin Top Legs for the bin
1 -7/16"
21"
Condenser Inlet, 3/8" O.D.
Tube (Water Cooled)
Condenser Drain 3/8"
O.D. Tube (Water Cooled)
SPECIFICATIONS:
ICE MAKER
Model
Number
MFE400AS-1 MFE400WS-1 MFE400WS-1
MFE400AS-6 MFE400WS-6 MFE400WS-6
Model
Series
AorB
AorB
Water Inlet
3/8" Male Flare
Electrical
Inlet
3.5"
2"
2.5"
Dimensions
(w/o Bin)
H"xW"xD"
21.5 x 21 x 22 A B
A B
same same same same same
Basic
Electrical
115/60/1
same same
230/50/1
same same
8"
9.5"
Condenser
Type
Air Water Water
Air Water Water
Minimum
Circuit
Ampacity+
11.1
10.2
10.2
5.6
5.1
5.1
Maximum Fuse Size
15 15 15 15 15 15
Drain 7/16" I.D.
Hose
Refrigerant
Charge
(R-134a)
15 oz. 15 oz. 14 oz. 15 oz. 15 oz. 14 oz.
*Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.
September 2005
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Page 3
FOR THE INSTALLER
MFE400
Installation Limitations:
This ice system is designed to be installed indoors, in a controlled environment:
Min Max
Air Temperature 50 Water Temperature 40 Water Pressure 20 psi 80 psi Voltage -10% +10% (Compared to the Nameplate) Operating the machine outside of the limitations is
misuse and can void the warranty. Scotsman Ice Systems are designed and
manufactured with the highest regard for safety and performance. They meed or exceed the standards of UL, NSF, and CSA.
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 changes are subject to change without notice.
0
F. 1000F.
0
F. 1000F.
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. This section is not intended as a complete resource for water questions, but it does offer these general recommendations:
1. Filter the water used to make ice. That is the water going to the “potable” water connection. Water filters vary greatly in ability and function. Install one that filters out suspended solids to a dimension of 5 microns or smaller. The finer the filter the better, but finer filters will clog sooner that course ones. It may be necessary to add a course filter ahead of the fine filter to prolong filter life.
2. Check with a water treatment specialist for a water test, and recommendations regarding filters and treatment.
Service Limitations:
There must be space above, to at least one side, to the back, and of course the front for service access.
Airflow
May 1994
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Page 4
HOSE CLAMP
ICE CHUTE INSTALLATION
MFE400
FOR THE INSTALLER
Location
After uncrating and inspection, the unit is ready to be installed.
It is important that the machine be installed in a location where it has enough space around it for service, and a minimum of 6" be allowed all sides for air circulation. The machine, when air cooled, draws air in the front, and exhausts it out the sides and back.
Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the limitations described on page 3.
Storage Bin
Tip the uncrated storage bin on its back, using parts of the carton to protect the exterior finish. Install the legs into the threaded holes in the bottom of the bin. Turn the leg levelers all the way in preparation for leveling later.
Return the bin to the upright position, remove paper covering the bin gasket.
Install bin top if required.
5. Remove the rubber cap from the top of the ice chute. Leave one hose clamp on the chute.
6. Push the ice chute against the stainless spout (the end of the spout will go into the chute).
7. Slide the rubber cap over the top of the stainless spout. Push down until it fits tightly around the spout.
8. Secure the rubber cap to the spout with the two hose clamps, in the molded grooves; one above and one below. Keep hose clamp screws away from evaporator.
9. Attach the insulation halves around the top of the evaporator. Secure with the ty-wrap provided. Finish installation per service manual.
HOSE CLAMP
RUBBER CAP
MOLDED GROVES
HOSE CLAMP
Note: Do not push bin into position: but lift it there. Pushing a bin, especially one with ice in it, can cause damage to the legs and the leg mounts.
Ice Maker
The machine is heavy, so the use of a mechanical lift is recommended for lifting the machine high enough to install on top of the bin. After the machine is placed on the bin, line it up so that the ice discharge opening in the base of the machine is over the open hole in the bin top.
Ice Chute Installation
After the MFE400 has been installed on the ice storage bin, the ice chute needs to be installed:
1. With the top panel off, remove all packing material (bubble pack) from above the ice chute and chute cap. Cut the ty-wrap holding the chute assembly in place.
2. Remove the insulation halves and ty-wrap packed inside the cabinet, retain for later use.
3. Remove the cardboard support from under the ice chute.
ICE CHUTE
METAL ICE
SPOUT
HOSE
CLAMP
RUBBER
CAP
METAL SPOUT
4. Insert the ice chute/bin thermostat assembly into the large hole in the bottom of the ice machine. Check that bin thermostat cap tube is free from contact with most components.
May 1994
Page 4
ASSEMBLED VIEW
Page 5
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
Water Inlet
Air Cooled: The recommended water supply is cold water. Use 3/8" O.D. copper tubing, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply.
Water Cooled: A separate should be connected to the condenser inlet, with a separate hand valve to control it.
Drains
Air cooled: There is one hose to connect to for a drain. This drain is a gravity drain, and a minimum of
1
⁄4" per foot fall is needed
for horizontal portions of the drain line.
The ideal drain receptacle is a trapped and vented floor drain.
Use only rigid tubing. Water Cooled Models: In addition to
the above mentioned drain, separate condenser drain must be installed. Connect to the
3
⁄8" condenser drain
tube. Storage Bin: A separate gravity type
drain needs to be run. This drain line should be insulated.
3
⁄8" O.D. copper tube
7
⁄16" I.D.
CONDENSER
WATER INLET
(Water Cooled)
MFE400
OVERFLOW
DRAIN
POTABLE WATER
INLET
WATER FILTER
(FIELD SUPPLIED)
CONDENSER DRAIN
(Water Cooled)
BIN DRAIN
FLOOR
DRAIN GRILL
September 2005
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MFE400
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
The electrical power to the unit is to be wired through the cabinet to the control box. In the control box, connect to the terminal strip provided.
1. Remove the front, top and right side panels.
2. Remove the control box cover.
3. Route the power cord thru the cabinet to the control box.
4. Connect wires to the terminal strip.
5. Replace all panels. Check the nameplate (located on the back of the
cabinet) for the voltage requirements, and for the minimum circuit ampacity. The machine requires
a solid chassis to earth ground wire.
The ice maker should be connected to it’s own electrical circuit so that it is individually fused. Voltage variation must remain within design limitations, even under starting conditions.
All external wiring must conform to national, state, and local electrical codes. The use of e licensed electrician is required to perform the electrical installation.
ELECTRICAL POWER
SUPPLY
CONNECT ELECTRICAL
POWER TO ICE MAKER
THROUGH ELECTRICAL
INLET HOLE AND INTO
CONTROL BOX
May 1994
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FOR THE INSTALLER: Final Check List
1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed the design limitations?
2. Is there an electrical service disconnect within sight of the installed machine?
3. Have all the plumbing connections been made and checked for leaks?
4. Has the machine and bin been leveled?
5. Is there a minimum of 6" clearance around the machine for proper service and air circulation?
6. Is the water pressure a minimum of 20 psig?
7. Has the ice discharge tube been installed?
8. Is there a water shut off installed near the machine?
9. Have all shipping materials been removed?
Electrical
Power?
MFE400
Water Supply?
Leveled?
Drains?
May 1994
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MFE400
INITIAL START UP
1. Remove screws and the front panel.
2. Open the water shut off valve.
3. Observe that the water flows into the water reservoir, fills up the water inlet tube to the evaporator, the float moves up with the water level, and the float shuts off the water flow, about below the molded horizontal line on the water reservoir.
4. Switch on the electrical power to the unit.
5. Switch the master switch to ON.
6. After a few minutes of operation: water should begin to flow from the reservoir to the evaporator; the air cooled condenser should begin to discharge warm air, or the water cooled condenser should beginning to discharge warm water; and the unit should begin to drop ice into the storage bin.
7. Let the unit operate for 15-30 minutes, checking for water leaks, or excessive noise from vibrating components.
8. Block off the ice discharge tube, and check if the bin thermostat shuts off the machine. After it shuts off the compressor, the auger motor should run for a few minutes more. Allow the ice in the tube to fall away, and check that the compressor restarts.
3
"
8
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)
Amount of adjustment from factory setting
Range Screw CW
2,000 35 4,000 90 6,000 145 8,000 190
o o
o o
9. Explain the operation and maintenance requirements to the user, inform the user of the telephone number of the service agency servicing the machine, and give the user the service manual.
May 1994
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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.
High Pressure Control: The pressure switch, used on water cooled models only, 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.
It is a manual reset.
MFE400
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
0
F. The capillary tube is
45 mounted on the inside of the ice chute.
0
F. and closes at
High Pressure
Control
Auger Delay Control
Bin Thermostat
On-Off Switch
May 1994
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Page 10
MFE400
ELECTRICAL SEQUENCE
There are two circuits in the MFE400: 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 an automatic reset.
••From the spout switch the line side power now
is connected to the High Pressure Control (water cooled). This control, connected to the refrigeration system, is designed to open whenever higher pressures are sensed. The high pressure control 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 chute. It is open when there is ice on the portion of the control inside the ice chute. 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.
May 1994
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OPERATION: Water
Water enters the machine through the 1/4" male flare at the rear of the cabinet, goes past the water pressure switch and then to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. Reservoir overflows routed to the drain. Water cooled models have a separate water circuit for the cooling water: it enters the fitting at the rear, goes to the water regulating valve, then to the water cooled condenser and down the drain.
MFE400
PRESSURE
SWITCH
WATER
INLET
WATER RESERVOIR -
FLOAT VALVE
WATER SEAL
SAFETY SWITCH
SPOUT
ICE
CHUTE
RESERVOIR
OVERFLOW
DRAIN
AUGER DRIVE
MOTOR
ICE AND WATER SCHEMATIC
"B" MODEL
May 1994
Page 11
BIN
THERMOSTAT
BRACKET
Page 12
COMPRESSOR
CONDENSER
MFE400
OPERATION: Refrigeration
Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line to the capillary tube. The capillary tube meters liquid refrigerant into the evaporator, the volume of liquid refrigerant depending upon the temperature of the evaporator; warmer evaporators get more refrigerant and colder evaporators get less.
At the evaporator, the refrigerant enters an area of relatively low pressure, where it can easily “boil off” or evaporate. As it evaporates, it absorbs heat from the evaporator and whatever is in contact with it (such as the water inside it). After the evaporator, the refrigerant, now a low pressure vapor, goes through the suction line back to compressor, where the cycle is repeated.
System Characteristics
Typical Low Side Pressure 13 -14 PSIG Typical High Side Pressure
••
(air cooled) 137 - 170 PSIG
••(water cooled) 135-140 PSIG
Typical auger drive motor amp draw: 2-8 - 3.1 Refrigerant Charge: 15 oz. of R-134a
EVAPORATOR
ACCUMULATOR
CAPILLARY TUBE
DRYER
May 1994
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MFE400
MAINTENANCE AND CLEANING
A Scotsman Ice Syst em rep resents a sizable investment of time and money in any compa ny ’s bus iness. In order to receive th e best retu rn for t hat inve st men t, it MUST re ceiv e period ic maint en ance .
It is the USER’S RESP ONS IB ILITY to see that the unit is prope rly maint ain ed. It is alwa ys pre fe rab le, and less costly in th e lon g run, to avoid possible down time by keep ing it clea n; adju stin g it as nee ded; and by replacing worn parts be fore th ey can cause failu re. The follo wing is a list of recomme nd ed maintenance that will help keep the machin e run nin g with a minimum of prob lems .
Maintenance and Clea ning should be schedule d at a minimum of twice per year.
ICE MAKING SYSTEM: In place cleaning
1. Check and clean any water treatment devices, if any are insta lled .
2. Remove screws and remove the top and front panels.
3. Move the ON-OFF switch to OFF.
4. Ope n the door to the ice storage 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 clea ning solution: Mix eigh t ou nces of Scotsman Ic e Mach ine Clean er with thre e quarts of hot water. The water should be between 90-11 5 degrees F.
8. Slowly pour the cleaning solu tio n into th e water reservoir un til it is full. Wait 15 minutes, then switch the master switch to ON.
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.
9. As the ice maker be gin s to use wat er fro m th e reservoi r, continue to add more clea nin g solu tio n to maintain a full reservoir.
10. After all of th e cle aning solution has been added to the reservoir, and the reservoir is nearly empty, switch the master switc h to OFF.
11. After draining the reserv oir, 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 po ssib le san itiz ing solut ion may be obtain ed by mixing 1 ounce of household bleach with 2 gallons of warm (90-115
14. Slowly pour the sanitiz er solu tion into the water reservoir until it is full, then switch the mast er switch to ON.
15. As the ice maker begins to use water from t he reservoi r, continue to add more clea nin g solu tio n to maintain a full reservoir.
16. After added to the reservoir, and the reservoir is nearly empty, switch the master switc h to OFF.
17. After dra inin g the rese rvoir, as in step 6, thoroughly wash and rins e the interior of the water reservoir and rese rvoir co ver with sanitize r s olu tio n.
18. Remove the block from the flo at in the wate r reservoir. Place the cover on the reservoir.
Switch the master switch to ON
19. Continue ice makin g for at lea st 15 minu tes, to flush ou t any cleaning or sanitizing solution.
DO NOT USE any ice produced from the cleaning solution.
Be sure no ice remains in the bin.
20. Switch the master switch to OFF.
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 wit h the balan ce of the sanitizer mixe d in step 14 by thoro ug hly was hin g all interior surf ace s of the bin, bin door an d door frame with the sanitize r solu tio n.
24. Switch the master switch to ON.
25. Replace th e top and the fro nt pane ls. Th e machine is now ready for continued automatic operation.
1
⁄2 of the cleaning so lution has been
o
F.) potable water.
January 1996
Page 13
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MFE400
MAINTENANCE AND CLEANING
///////////////////////////WARNING/////////////////////////////
Disconnect electrical power and shut off the water before beginning.
//////////////////////////////////////////////////////////////////////////
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. Remove styrofoam cap and two screws from the side of the evaporator.
2. 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.
4. Replace the water seal, see the instructions under "Removal and Replacement".
TOP
BEARING
AUGER
The bearings may be inspected for rust, wear, and roughness. Reverse to reassemble.
To Inspect the Auger:
1. Remove styrofoam cap and two screws from the side of the evaporator.
2. 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.
3. 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.
May 1994
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MFE400
SERVICE DIAGNOSIS
PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION
No ice, nothing operates No electrical power Check/restore power
Water supply turned off Check water filter/hand valve/float
valve Bin control malfunction Check bin thermostat Spout switch open Check bin thermostat Master switch off Check why switch is off Water pressure low (water safety
switch open) High pressure cut out open Check fan motor or water supply Auger drive motor open Check auger drive motor Centrifugal switch open Check centrifugal switch Auger delay switch open Check/replace auger delay
No ice, auger motor turning. Auger does not turn Check coupling & gear reducer
Low system charge Check refrigeration system.
Compressor off Check system for adequate
Low capacity Overuse Recheck ice needs vs. machine
Check & clean water inlet & filters
Locate leak, recover remaining
refrigerant, repair leak. Replace
drier, evacuate and weigh in
system charge.
refrigerant.
Check start relay
Check start capacitor
Check compressor windings
Check for compressor lock-up
capacity
May 1994
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Page 16
MFE400
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
May 1994
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Page 17
REMOVAL AND REPLACEMENT
MFE400
Ice Breaker and Auger Removal
1. Remove styrofoam cap and two screws from the side of the evaporator.
2. 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.
3. 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. The bearings may be replace or the ice breaker and bearings may be replaced as an assembly.
Water Seal Installation
Inspect the water seal in it’s package. Do no use if mating surfaces are scratched or cracked.
1. Remove auger, unbolt evaporator from adapter stand. Drive out old bottom bearing and water seal from the top down.
2. Remove the old rotating half of the water seal from the auger and clean the auger at the seal mounting area.
Outer Race
Sealant Here
3. Apply Scotsman part number 19-0529-01 food grade sealant to the auger shoulder before pushing on the water seal. Place just enough sealant onto the shoulder of the auger, so that when the water seal is placed on the auger, the gap between the auger shoulder and the water seal is completely filled with the sealant.
4. Clean the inside of the evaporator at the bottom bearing and water seal mounting area. Lubricate the outside edge of the stationary seal with water.
5. Carefully push the stationary part of the water seal up into the bottom of the 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 adapter stand to the bottom of the evaporator. Hand tighten the three cap screws until the stand flange is
Wider at Top
Narrower
at Top
Inner Race
8. The
breaker/bearing assembly onto the auger before installing the auger into the evaporator tube.
tight against the bottom of the evaporator. Hand tighten the three cap screws until the stand flange is tight against the bottom bearing. Then, tighten the screws in a rotating pattern to insure proper alignment.
top bearing should also be changed at this time. Be sure to mount the top
Rubber
Metal
9. Lower the auger into the evaporator, twist it to engage the splines of the coupling. Secure the breaker and bearing to the evaporator tube with the two screws removed in step 1 of “Ice Breaker and Auger Removal”. Test the unit.
Water
Seal
May 1994
Page 17
Page 18
MFE400
REMOVAL AND REPLACEMENT: Gearmotor Assembly
Rebuilding The Gearmotor Assembly
Drive Motor Parts: To replace the centrifugal switch and mechanism
or the motor winding or the motor rotor, removal of the gearbox assembly is not necessary.
1. Disconnect electrical power.
2. Remove the cover from the top of the centrifugal switch assembly and remove the electric wires from the microswitch. To replace just the centrifugal switch, remove two machine screws retaining the switch, and remove the switch. To replace, reverse the procedure to this point.
3. If the motor is to be removed, the next step is to remove the four screws holding down the plastic switch assembly housing and lift the housing off of the motor top.
4. Remove the centrifugal switch mechanism from the rotor by unscrewing the machine screw at the top of the rotor.
5. The motor and housing may now be removed. Lift off the motor fan housing, and pull off the plastic fan. The next part to be removed is the motor winding. Disconnect the electrical leads of the motor from its control box location and lift off the winding.
6. The rotor is all that remains of the motor in the gear motor assembly. Use a pry bar to carefully pry up the rotor. (The only thing holding it in is the tight fit of the bottom rotor bearing into the top of the gear case.) To replace any of the above parts, reverse the disassembly procedure.
Removal of the Gearmotor Assembly
1. Remove the top and right side panel.
2. Remove the ice chute assembly.
3. Unscrew the three cap screws retaining the evaporator assembly to the gearmotor assembly.
4. Unscrew the bolts holding the gearmotor mounting plate to the ice machine chassis.
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 adapter.
7. Remove the gearmotor assembly from the ice machine.
After removal of the gear motor from the unit, inspect the internal parts from this gearmotor.
1. Place the gearbox on a flat surface, covered
with rags to absorb any spilled lubricant.
2. Using a punch, drive the roll pins out of the
casing.
3. Remove the four cap screws on the top of the
gearcase and the two under the motor.
4. Pry the two cases apart.
When inspecting the internal parts, look for:
••
Condition and quantity of lubricant. (The proper oil level is near the top of the output (biggest) gear. This takes 5 oz. Use Scotsman oil, part number A25835-001.
••Bearing condition
••Gear and Shaft condition
••Woodruff key between output gear and shaft.
••Grease seals, back to back.
••Vent hole
Be sure to count and retain the spacer washers as they come out of the gearbox.
Replace the parts as required, using the part numbers found in the parts section of this manual. Replace the gears into a CLEAN bottom gearcase, after adding some grease to the bearings. Replace the spacers in the same quantity as they were removed. If no count was kept, use the numbers found in the parts list.
Note: Some bearing grease should be placed in all bearings before assembly to insure proper lubrication upon start up.
Reassembly
1. Set top gearcase on gears and spacers and oil.
Be sure O-ring is in place.
2. Drive roll pins back into locating holes.
3. Replace cap 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.
Gearcase Service
May 1994
Page 18
Page 19
Gearmotor Service
MFE400
MOTOR COVER
WINDING
SHAFT SEALS
FAN
OUTPUT
SHAFT
ROTOR
KEY
FIRST GEAR
AND PINION
May 1994
Page 19
Page 20
Water Inlet
MFE400
Reservoir.
1. Shut off the water supply.
2. Remove the top panel.
3. Remove the right side panel.
4. Drain the water reservoir and evaporator.
5. Disconnect inlet and outlet tubes from the reservoir.
6. Remove thumbnut holding reservoir to its mounting bracket.
7. Remove reservoir from the machine.
Cover
8. Reverse to reassemble. Float Valve
1. Shut off the water supply.
2. Remove the top panel.
3. Remove the reservoir cover.
4. Remove the water inlet tube.
5. Remove nut (at inlet) holding valve to tank.
6. Replace with a new valve.
Float
Overflow
Hose
Tank
Water Level
Thumbnut
Hose To Evaporator
May 1994
Page 20
Page 21
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.
General Service 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.
The access valves must be in the closed position before the hose caps are removed. Do not remove the hose caps before checking the position of the valve. Use a 3/16" allen wrench to open and close the valve.
Recovery and vacuum equipment should use
Torque Stem
to 6-8 ft. lb.
Torque Stem
Cap to 8-12 ft. lb.
Torque Fitting Cap
to 7-12 ft. lb.
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.
MFE400
Temperature Pressure Chart, Selected Points Temperature in
0
F. PSIG of R-134a
-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
Evacuation to 200 microns is recommended.
May 1994
Page 21
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