MF/MFN 88 - Scotsman
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SERVICE MANUAL
MF/MFN 88
Modular superflaker/nugget
split
SCOTSMAN EUROPE - FRIMONT SPA
Via Puccini, 22 - 20010 Pogliano M.se - Milano - Italy
Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500
Direct Line to Service & Parts:
Phone +39-02-93960350 - Fax +39-02-93540449
ISO
900
1-C
Website: www.scotsman-ice.com
ert.
n. 0
080
E-Mail: [email protected]
MS 1000.28
REV. 06/2014
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TO BE USED JUST
BY THE INSTALLER
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TABLE OF
CONTENTS
Section I
Table of contents
Specifications
6
6
6
6
6
6
7
7
8
OPERATING INSTRUCTIONS
Pre-start inspection
Start up
Section III
3
4
GENERAL INFORMATION AND INSTALLATION
Introduction
Description
Sealed refrigerant system
Storage bin or ice room
Unpacking and iInspection
Location and levelling
Electrical connection
Water supply and drain connection
Final check list
Section II
page
8
8
PRINCIPLES OF OPERATION - HOW IT WORKS
ICE MAKER
Water
Ice
Refrigeration
ELECTRICAL/REFRIGERATION
9
9
9
9
10
ADJUSTMENT, REMOVAL &
REPLACEMENT PROCEDURES
12
Section V
SERVICE DIAGNOSIS
15
Section VI
WIRING DIAGRAMS
Wiring Diagram MF/MFN 88
17
18
Section VII
MAINTENANCE AND CLEANING INSTRUCTIONS
19
Section IV
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SPECIFICATIONS
MF/MFN 88
Important operating requirements:
MINIMUM
MAXIMUM
• Air temperature
10°C (50°F)
40°C (100°F)
• Water temperature
5°C (40°F)
35°C (100°F)
• Water pressures
1 bar
5 bar
• Electrical voltage variation
• voltage rating
specified on
nameplate
-10%
+10%
Extended periods of operation exceeding these limitations
constitutes misuse under the terms of Scotsman
Manufacturer's Limited Warranty, resulting in a loss of
warranty coverage.
We reserve the right to make product improvement at any
time. Specifications and design are subject to change
without notice.
ice making capacity
MF 88
MFNS 88
AIR COOLED MODELS
Kg.
MFNL 88
AIR COOLED MODELS
Kg.
°C
2500
1900
°C
10
1850
21
AIR COOLED MODELS
Kg.
°C
1950
10
10
2400
1850
1800
2300
1750
1900
38
1800
1650
1600
1550
1500
38
1450
1400
1700
1650
1550
32
1450
1350
38
1250
AMBIENT TEMPERATURE
2000
1700
ICE PRODUCED PER 24 HRS.
32
21
32
AMBIENT TEMPERATURE
2100
ICE PRODUCED PER 24 HRS.
2200
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
1750
1150
1350
1600
1050
1300
1500
32
27
21
15
10 °C
WATER TEMPERATURE
1250
32
27
21
15
10 °C
WATER TEMPERATURE
950
32
27
21
15
10 °C
WATER TEMPERATURE
NOTE. Daily ice capacity is directly related to condenser air and water inlet temperature, water
temperature to make ice - and age of machine.
To keep your machine performing at its maximum capacity it is necessary to perform periodic
maintenance as outlined on Maintenance & Cleaning Section of this manual.
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SPECIFICATIONS (CONT'D)
Dimensions:
HEIGHT:
HEIGHT (with legs):
WIDTH:
DEPTH:
NET WEIGHT:
1140 mm
1290 mm
540 mm
780 mm
250 Kg
MF/MFN 88 - SPLIT - MACHINE SPECIFICATIONS
Basic electrical
Max
Fuse Size
Refrigerant
230/50/3N
Drive Motor
2.65 Amps/1410 rpm
R404a
400/50/3N
5A
1.53 Amps/1410 rpm
Cooling Reg.
at -25°C / +35°C
Ice Type
7740 Kcal/hr
9000 W
30700 Btu/h
SUPER
FLAKE /
NUGGET
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SECTION I
GENERAL INFORMATION & INSTALLATION
INTRODUCTION
This manual provides the specifications and the
step-by-step procedures for the installation, startup, operation and maintenance and cleaning of
the SCOTSMAN Model MF/MFN 88.
The Model MF/MFN 88 is a quality designed,
engineered, constructed and throughly tested
icemaking system, providing the utmost in
flexibility to fit the needs of a particular user.
DESCRIPTION
The Scotsman MF/MFN 88 - continuous flow ice
maker - consists of one large capacity flake ice
making system contained within a compact
cabinet entirely in stainless steel. The flake ice
produced is extruded through an ice discharge
opening. All panels are removable to allow easy
access to electrical and mechanical components
for cleaning and maintenance.
SEALED REFRIGERANT SYSTEM
The freezer auger is driven by a gear motor assy.
The refrigerant used is R 404 A controlled by an
automatic expansion valve.
5. Remove all internal support packing, tape
and wires in machinery compartment.
6. Check that refrigerant lines do not rub or
touch lines or other surfaces, and that fan blades,
if any, move freely.
7. Use clean damp cloth or disposable paper
wiper to pipe clean the exterior surfaces of the
cabinets.
8. See DATAPLATE on the cabinet base and
check that the location source voltage corresponds with the voltage specified on the
dateplate.
CAUTION. Unproper voltage supplied to
the ice Maker will void your parts
replacement program.
9. Remove the Manufacturer’s Registration
Card from the User Manual and fill in all spaces
including: Model Number and Serial Number
taken from the aluminium plate.
Forward the completed, self addressed,
registration card to the Frimont Factory.
STORAGE BIN OR ICE ROOM
Since the MF/MFN 88 is a continuous flow type
ice maker and does not have its own attached
storage bin, it is necessary to use an auxiliary bin
or prefabricated ice room for appropriate ice
storage. An insulated ice storage bin or room is
always required, then - according to ice
applications - this can be refrigerated or nonrefrigerated; a weight/volume ratio of 1,8 m3 per
ton must be taken into consideration for correct
ice storage room design which, in any case,
should be dimensioned to accomodate a
minimum of 16 hrs. ice production.
UNPACKING AND INSPECTION
1. Call your authorized SCOTSMAN
Distributor or Dealer, for proper installation.
2. Visually inspect the exterior of the shipping
container and skid and any severe damage
noted, should be reported to the delivering carrier;
and, a concealed damage claim filled in subjetct
to internal inspection, with carrier representative
present.
3. Remove the packing, and the shipping base
or skid.
4. Remove screws and shipping tape, and
service panels from the cabinet, and inspect for
any concealed damage.
Notify carrier of any concealed damage claims,
as stated in step 2 above.
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LOCATION AND LEVELLING
WARNING. This unit must be installed in
an area where it will not freeze and
protected from the elements such as wind,
rain, water spray or drip. Ambient temperature limitations are: 10°C (50°F)
minimum and 40°C (100°F) maximum,
while water temperature limitation are:
5°C (40°F) minimum and 35°C (90°F)
maximum. Ambient and water temperature exceeding these limitations may
result in machine malfunction and the
loss of warranty coverage.
Make sure that the structure on which the ice
maker will be located be on a solid footing and
supports at least 700 Kgs.
This ice maker is designed for free standing
application only. Do not built it in. Make sure that
location site is well ventilated to ensure correct
operation. Also allow 20 cm clearence in back
and both side of the ice maker to be able to easily
perform service inspections and operations.
1. Erection - For elevation of machine to its
stand or location, fork lifttrucks should be used.
2. Position the MF/MFN 88 in the selected
permanent location and level the cabinet on both
the left-to right anf front-to-rear direction.
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3. Ice chute to convey the ice from the outlet of
the machine to the ice storage area is supplied
with the machine.
4. Thermostat capillary tube must be positioned so that its end extends out the ice chute
opening or the ice deflector and get easily in
contact with the cone formed by the ice deposited
in the storage room, before - anyway - that ice
builds-up in the chute.
Thermostat capillary tube is coiled behind the
control box, it must be routed to follow the ice
chute or ice deflector and protrude for a certain
extension beyond the ice discharge opening in
the storage room. Use caution when routing this
capillary to prevent kink or to bent it excessively.
Coil excess capillary inside ice maker cabinet.
Tape coil to prevent vibration againt another part.
B.
WATER DRAIN
The recommended drain tube is a plastic or
flexible tube with 18 mm (3/4") I.D. which runs to
an open trapped and vented drain.
FINAL CHECK LIST
1.
Is the Cabinet level? (IMPORTANT)
2. Have all electrical and piping connections
been made?
ELECTRICAL CONNECTION
See machine electrical specifications in Unit
Nameplate and at page 5 of this Service Manual
to determine wire size to be used for electrical
supply. This unit must be grounded according to
all Electrical Codes and local ordinances. Provide
a fuse disconnect box within sight and easyreach of the ice maker. Use timed fuses on all
terminals.
The maximum allowable voltage variations should
not exceed ten percent of the nameplate rating,
even under starting conditions. Low voltages can
cause erratic operation and may be responsible
for serious damages to the overload switch and
motor winding.
3. Is there an electrical service disconnect
within sight of the installed machine?
Has the voltage been tested and checked against
the nameplate rating?
WATER SUPPLY AND DRAIN CONNECTIONS
7. Has the Manufacturer’s registration Card
been properly filled out? Check for correct Model
and serial numbers from Serial nameplate, then
mail the completed card to the FRIMONT factory.
A. The recommended water supply line is a
3/4 inch O.D. fitting. Connect to cold water supply
line with standard plumbing fittings, with a shutoff
valve installed in an accessible place between
the water supply and the Cabinet.
In some cases, a plumbing permit and services
of a licensed plumber will be required.
CAUTION - This ice maker is equipped
with a low water pressure safety device
which, in the event of low water pressure,
will automatically stop the ice maker to
prevent damage. The ice maker will
automatically restart with increased water
pressure.
This ice maker will not operate properly
when water supply temperatures are
below 5°C (40°F) and above 35°C (90°F).
NOTE. Water supply must be installed to
conform with local plumbing codes. In
some cases, a plumbing permit and
services of a licensed plumber will be
required.
4. Is the water supply line shutoff valve installed
near the machine.
5. Have all the wires been checked for
looseness and thightness.
6. Has the owner/user been instructed on
how to operate the Icemaker.
8. Check all refrigerant linea and conduit lines,
to guard against vibration or rubbing and possible
failure.
9. Is there at last 20 cm. clearance behind
and around Cabinet for proper air circulation?
10. Is the Icemaker installed indoor in a location
where ambient temperatures are a Minimum of
10°C (50-degrees F.) all year around?
11. Has water supply pressure been checked to
insure a minimum of 1 atm (14 PSI).
12. Verify that unit lighted switch is in the OFF
position.
13. Has the owner been given name and
telephone number of the authorized SCOTSMAN
Service Agency.
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SECTION II
OPERATING INSTRUCTIONS
PRE-START INSPECTION
NOTE. The MF/MFN 88 is equipped with a 3
Phase Monitoring Relay (F1). In case the
three phase are connected in wrong way, the
machine doesn't start with the simultaneous
glowing of the 3 Phase Sequence Protector
Warning light. Just reverse two of the three
phases on the main plug so to have the
correct sequence and by so, the start up of
the machine.
Verify that drive motor current limiter GAVAZZI
DIB71 (KA1), located in control box on side of
contactor (KM2), has the following setting.
HYS
LEVEL
DELAY
MF 88
400V
230V
6
6
60% - 1.2 Amps 50% - 2.5 Amps
2 sec
2 sec
MFN 88
HYS
LEVEL
DELAY
400V
6
100% - 2 Amps
2 sec
230V
2. After having properly connected the unit to
any rack system or dedicated condensing unit,
15 minutes later, after the start up of the drive
motor (yellow led of the Time Delay Relay KT1
blinking), the liquid valve opens.
3. After two or three minutes of unit operation
observe that flaked ice begins to drop out in the
ice spout.
4. Let the system operate for about 30 minutes.
Check for any excess noises beyond normal
noise:
a) Vibrating type from touching lines.
b) Chattering: lack of water in Freezer.
Dip switch (under cover):
400 V all in ON position
230 V dip Sw 1 in OFF position, 2 → 6 in ON
position.
5. If desired, the low side pressure can be
checked, it should be 1.7 atm (25 PSI).
Check to see through liquid sight glass for correct
refrigerant flow and charge.
START-UP
The following procedure can only be started after
pre-start inspection has been properly completed.
6. Evaporator pressure type KVP value opens
at a rise in pressure on the inlet side, i.e. when the
pressure in evaporator exceeds the set value.
1. Open the water supply line shutoff valve.
Observe that water enters the water reservoir,
fills the tube from the reservoir to the evaporator
and then shut-off. Check for leaks.
7. Hold a handful of ice around the ice storage
bin thermostatic control bulb to test shut-off. Less
than one minute is about normal for bulb shut-off
function to cause the ice maker to stop (Drive
motor after 15 minutes delay - yellow led of KT2
blinking).
Remember that unit will resume operation after
15 minutes that bin thermostat has closed its
contacts.
8. There are no adjustments to make, so
replace the panels.
9. Throughly explain the owner/user the
significant specifications of the ice maker, the
start-up, operation and attention to pay going
through the procedures in the operating
instructions. Answer all questions about the ice
maker, by the owner, and inform the owner of the
name and telephone number of the authorized
SCOTSMAN Service Agency serving him.
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SECTION III
PRINCIPLES OF OPERATION - How it Works
ICEMAKER:
Water
The water supply flows from the building source
through the enters at the Cabinet fitting and on to
the Water Reservoir.
The water Reservoir functions to maintain a
constant water level inside the Freezer Assembly.
Water from the Water Reservoir enters at the
bottom of the freezer Assembly and is changed
into ice by low temperatures inside the freezer.
Ice
A stainless steel Auger within the Freezer is
powered by a separate drive motor through a
speed reducer and the rotating Auger carriers
the ice upward to the Ice Breaker assy where
excess water is pressed out of the ice, as it is
extruded or flaked out through the Ice breaker.
The flake ice into spout in diverted out through
the ice discharge opening.
Once unit is electrically connected, after 15
minutes starts the automatic and continuous
icemaking process. When the Ice touches the
Thermostatic Control Bulb, the sensing bulb
shuts off the compressor first and 15 minutes
later the drive motor.
Refrigeration
At beginning the refrigerant R 404 A is compressed by the compressor 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 liquid.
This high pressure liquid then goes through the
liquid line to the expansion valve. The expansion
valve meters liquid refrigerant into the evaporator.
At the evaporator, the refrigerant enters an area
of relatively low pressure where it can easily
"boil-off" or evaporate.
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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 heat exchanger and suction line
back to compressor, where the cycle is repeated.
ELECTRICAL/REFRIGERATION
The MF/MFN 88 Flakers are designed to operate
at 400 Volts. 50 Hertz, threephase plus neutral.
Special voltage requirements are available on
special order.
Therefore, always CHECK NAMEPLATE for
electrical information BEFORE proceeding with
electrical wiring connections to the Icemaker.
Cold ambient temperatures and interruptions in
water supply are conditions that can cause
excessively hard ice and overloads within the
Freezer Assembly, which is directly trasmmitted
to the Drivemotor; and in turn, will cause the
intervention of Drive Motor Current limiter.
Spout Switch is mounted on the top of the Ice
Spout and is actuated by the movement of the
spring retained pressure plate. The spout switch
acts as a back-up safety switch, should the
termostatic Control Bulb fail and cause ice to
jam-up in the ice spout. The switch will shutoff the
ice maker when actuated. The Spout Switch can
be manually tested by pressing upward the
pressure plate. There are other safety controls in
the machine and are:
Liquid Line - Solenoid Valve
Necessary to stop refrigerant flow when not
desired to be located on the liquid line past the
drier is electrically connected to compressor contactor
or relay to stopflooding the evaporator and suctionside
during compressor off periods. Supplied.
The low-water pressure Switch functions to
discontinue the ice making process whenever
incoming water pressure is reduced to below
0.3 bar (4 PSI). The switch will automatically
restart the icemaking process when the water
pressure is increased to 1 bar (14 PSI).
EPR valve. Evaporator Pressure Regulating
Valve. this valve maintains a constant pressure
on evap. Inlet regardless of the pressure on the
outlet so it keeps the evaporator temperature
above a pre-determined value preventing
dangerous freeze-up conditions (KVP).
Sight Glass
A sight glass is intalled in the liquid line. The sight
glass will show bubbles if the system is low on
refrigerant.
Solenoid valve delay timer (KT1)
Delays the opening of the liquid valve by 15' at
every start up of the ice maker.
Gear motor delay timer (KT2)
Delays gear motor STOP by 15' at every trip OFF
of the ice maker.
3 - phases monitoring relay (F1)
On the power in of the machine check and assure
correct Wiring - rotation of the gear motor.
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Drive Motor Current Relay - Gavazzi DIB71 (KA1)
It senses the intensity at the drive motor, should
this exceed its Amps setting point as per here
below chart, tripping OFF the entire machine.
HYS
LEVEL
DELAY
MF 88
400V
230V
6
6
60% - 1.2 Amps 50% - 2.5 Amps
2 sec
2 sec
HYS
LEVEL
DELAY
MFN 88
400V
230V
6
100% - 2 Amps
2 sec
Dip switch (under cover):
400 V all in ON position
230 V dip Sw 1 in OFF position, 2 → 6 in ON
position.
CONTROL CONSOLE
Located on the front panel is a virtual control
console that monitors unit performance automatically. Any interruption or significant reduction
in water or electrical supplies causes an instant
stop to the operation of the modular flaker.
At the same time a warning light is activated on
the control console telling the user of the ice
makers stoppage and also the reason why.
Whenever any stoppage accured, its cause
should be diagnosed and corrected the cause of
the stoppage should be diagnosed and corrected
also the reason why.
IN OPERATION
LOW WATER PRESSURE
SPOUT SWITCH
BIN FULL
PHASES CTL.
DRIVE MOTOR RELAY
The Drive Motor Bonfiglioli mod. BN80A4
0.55 Kw Volts 230/400 Ph 3 Hz 50 Amps
2.65-1.53 RPM 1410 thermally protected.
Provides power through speed reducer to turn auger.
The Gear Reducer
Bonfiglioli mod. VF/W49/110 Ratio 1/400. High
and lo speed gear box are oil lubricated. Oil Must
be changed at LOW SPEED SECTION every
25.000 hours. Use lt. 1.8 of Syntethic Oil only:
SHELL TIVELA OIL SC 320
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The gear reducer is securely bolted on the chassis
base and supports the freezing cylinder as well.
On its input shaft there is fitted the driving pulley.
A separate output shaft with double keys is fitted
in the gear box bore and connected to the auger
shaft via aluminium casting coupling.
The Bin Thermostat Ranco K 22 - L 1075 - must
have its sensing capillary extended into ice room
in a way that it could be contacted by the ice when
storage ice room becomes filled. It terminates ice
production when its capillary gets in contact with
ice. It is wired in series with all other controls. It
is factory set to cut-out at 1,5°C and cut-in at 4°C.
The Expansion Valve is FLICA mod. AMVX 3 Press 3 bar - Office 4.5 mm for R 404 A - meters
the refrigerant to the evaporator serpentine at 1.7
bar (25 PSI).
Drive Motor Contactor Telemecanique
LC1K09 - with 4 N.O. contacts at 400V 9A with
230V 50-60 Hz coil.
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The Evaporator: a vertical stainless steel tube,
refrigerated, and water filled. In it there is a
stainless steel auger and a water seal.
The Auger: a stainless steel triple spiral auger, it
pushes the ice ribbon up to the top of the
evaporator.
The Water Seal: a two part "face" seal, the top
half rotating with the auger, the bottom half
stationary, the sealing action being where the
two seal "faces" meet.
The Breaker: where the ice is compressed and
much of the extra water is squeezed out of it
before it reaches the ice spout.
The Thrust Bearing (Top bearing): as the ice is,
pushed up the evaporator, the auger is thrust
down, and pressure from the auger thrust is
taken up by this bearing.
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SECTION IV
ADJUSTMENT AND REMOVAL AND REPLACEMENT PROCEDURES
The procedures provided in this Section are
arranged in alphabetical order, to make specific
Adjustment and Removal and replacement
information easy to locate.
Read the instructions throughly before performing
any Adjustment or Removal and Replacement
Procedures.
1.
ADJUSTMENT OF THE BIN
THERMOSTAT CONTROL
3.
This valve may be manually regulated by means
of the adjusting stem.
Turning the adjustment to the left counterclockwise, will increase the rate of refrigerant flow.
Turning the adjustment to the right (clockwise),
the refrigerant flow to the evaporator is reduced.
Use hex head wrench for manual adjusting
operations.
The control for the Bin Thermostat is the Temperature Control, located in the Control Box
Assembly.
NOTE.
A. These are general steps to be followed
at first, when removing any part of any
refrigeration system, which are in summary.
a) Store the refrigerant charge in
compressor crankcase.
b) Remove all refrigerant from part to be
opened.
c) Balance pressures in parts just
evacuated.
d) Isolate parts to be opened from the rest
of the system.
e) Clean and dry joints to be broken.
f) All refrigerant openings should be
immediately plugged as soon as they are
opened.
g) Upon reassembling, it is necessary to
remove all the air moisture from the lines and
whatever part that has been open to.
WARNING - The adjusting screws on the
Temperature Control device have very
sensitive response to adjustment.
Over-adjusting or erratic guessing, can
foul the instrument and cause ultimate
delay and part replacement, WHICH
COULD HAVE BEEN PREVENTED.
Factory settings is +1,5°C cut-out and +4°C
cut-in.
2.
ADJUSTMENT OF THE WATER LEVEL
INTO THE FREEZER CHAMBER
The correct Water Level in the Freezer Chamber
is about 2 cm (3/4 inch) below the ice discharge
opening. Low Water Level causes excessive
strain inside the Freezer Assembly due to a
faster freezing rate. When the Water Level is
above or below the correct level adjustment can
be performed to RAISE or LOWER the Water
Level by raising or lowering the Water Reservoir
and its Mounting Brackets.
A. To RAISE the Water Level: loosen and
remove the two screws which attach the Mounting
Bracket of the Water Reservoir to the frame and
raise the Water Reservoir Assembly of the desired
amount; then thread the screws in the
corresponding holes and tighten.
B. To LOWER the water Level: loosen and
remove the two screws which attach the Mounting
Bracket of the Water Reservoir to the frame and
lower the Water Reservoir Assembly of the
desired amount; then thread the screws in the
corresponding holes and tighten.
WARNING. - Be sure the electrical power
supply and the water supply are OFF,
before starting any of the following
REMOVAL
AND
REPLACEMENT
procedures, as a precaution to prevent
possible personal injury or damage to
equipment.
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ADJUSTMENT OF THE AUTOMATIC
EXPANSION VALVE
4.
REMOVAL OF EXPANSION VALVE
A. To remove the expansion valve:
1. Remove screws and service panels.
2. Close service valves on liquid line.
3. Run the compressor for a moment until
the evaporator coil has no liquid refrigerant in it.
4. With the compressor idling, equilize the
pressure by cracking the liquid line service valve.
5. Turn the suction service valve stem all
the way in.
6. Dry and clean the expansion valve
accurately.
7. Remove the liquid line and unbolt the
valve.
8. Seal refrigerant openings immediately.
B. To replace the expansion valve reverse
the removal procedures.
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5.
REMOVAL AND REPLACEMENT OF THE
AUGER, WATER SEAL, BEARINGS AND
COUPLING
A. To Remove the Auger, Water Seal,
Bearings, and Coupling:
1. Remove screws and the Front Panel and
the Top Panel. Shut close water supply. Drain
the water reservoir and freezer assy using the
drain tube attached to the freezer water inlet.
2. Remove the screws that secure the spout
to the stop of the Freezer Assembly.
3. Disconnect wires from micro box spout
switch.
4. Remove micro-box and the spout assy.
5. Remove center plastic cap that protects
top bearing.
6. Unloose and remove center bolt that
secures the ice breaker to the auger.
7. Unloose and remove 8 screws that hold
the ice breaker to freezer barrel.
(Two longer screws are used with freezer side
bracket).
8. Insert two of these screws into two
threaded-blind holes, which must have no bottom
on barrel and by evenly drawing them down, ice
breaker is lifted up.
9. Grasp the ice breaker and lift it up entirely.
Worm shaft witt remain into the freezer worm
tube.
10. With a rowhide mallet or a piece of wood
placed on the bottom end of the top bearing, tap
the bottom of the bearing to break it loose to be
pulled out from ice breaker.
11. Clean away old grease and replace the
"O" rings in the ice breaker.
12. Insert in auger hub threaded hole an
eyebolt of 16 m/m in order to offer sufficient and
positive hook for pulling-out the auger.
13. Lift and pull-out the auger with the help,
eventually of a small hydraulic Hoist.
NOTE:
1. Any time the Auger is removed for
replacement, or, for the inspection and
replacement of the Bearing or Coupling, use
extra care in handling the Water Seal parts,
so no dirt or foreign matter are deposited on
the surfaces of the Seal.
2. If there is any doubt about the
effectiveness of the Water Seal or O-Ring,
REPLACE THEM. A dirty, worn or faulty
Water Seal or O-Ring will cause a leak and
ultimately require a second, time consuming,
removal and replacement procedure to be
performed, that COULD HAVE BEEN
PREVENTED.
3. Lower bearing or water seal should be
removed by pulling-out the bearing retainer
from the bottom of freezer barrel.
You can heat the bearing retainer with a soft
flame.
The bearing will drop out by itself.
14. Remove screws and lockwashers which
attach the Freezer Assembly to the Adaptor on
the Gear box.
15. Raise the Freezer Assembly off of the
Adaptor, to gain access to the Bearing Retainer;
then, temporarily secure the Freezer Assembly
out of the way to allow room to work.
16. Unloose and remove the four screws
that secure the bottom flange to the worm tube.
17. Push out to remove the seal ring.
18. Remove the clip ring and the bearing
from the bearing retainer.
19. Inspect the lower half of the Water Seal.
If reusable, use care to protect it from dirt, etc.
prior to replacement procedure.
20. Inspect the lower Bearing and, if the
Bearing is dry replace it with a new one.
21. Inspect the O ring of lower bearing
retainer - eventually replace it with a new one.
22. Reach through the Adaptor and remove
the Coupling for inspection.
23. Check the Coupling for cracks, chipping
and excessive wear.
B. To replace, the Auger, Water Seal,
Bearings, and Coupling, reverse the removal
procedure.
NOTE:
1. When installing the Bearing, in the
bearing retainer carefully tap a piece of wood
positioned across the bearing, to evenly seat
the Bearing in the retainer.
2. After assembling the ice breaker on
the upper end of the Auger and BEFORE
installing the Cap apply an ample coating of
vary bond grease type Never Seez food
grade H1 - certified -20°C +150°C Grease,
P/N 263612 00, to the upper part of the
Bearing, the Cap Screw and Washer.
Then, install the Cap in place.
6
REMOVAL AND REPLACEMENT OF
THE FREEZER ASSEMBLY
NOTE:
1. The Cabinet may have to be removed
from is permanents location, especially if
located in a corner, in order to have access
to the left side and rear of the Chassis.
2. In addition to shutting OFF electrical
power and inlet water to the icemaker, be
sure to disconnect the inlet water line
BEFORE moving the icemaker from the
permanent location.
3. Always install a replacement Drier,
anytime the sealed refrigeration system is
opened. Do not replace the Drier until all
other repair or replacement has been
completed.
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Page 14
Page 14
A. To Remove the Freezer Assembly:
1. Remove screws and left and right side
rear panels.
2. Refer to procedure IV-12 and remove the
Spout Assembly, Ice Breaker and Auger.
5. Remove the Water Reservoir Assembly,
from the mounting bracket.
B. To replace the Water Reservoir Assembly,
reverse the removal procedure.
NOTE: Check that the installed replacement
Water Reservoir Assembly float moves freely.
3. Remove Corbin clamp and Tygon tube
from the Freezer Assembly that connects to the
Water Reservoir Assembly.
4. Perform operation at steps 2-3-4-5 at
procedure IV-10.
8
5. Disconnect suction line joint from the
freezer.
6. Unsolder the refrigerant inlet line at the
freezer.
7. Remove screws that secure bracket of
freezer to the left side of chassis.
8. Remove screws, lock washers and
washers which attach the bottom of the Freezer
Assembly to the Adaptor on the Gear box.
REMOVAL AND REPLACEMENT OF THE
DRIVE MOTOR
A. To remove the drive motor assembly:
1. Remove screws and front, and left side
panels.
2. Disconnect wire leads to motor.
3. Remove four hex head bolts, lockwashers
and washer which attach the motor to the gear
reducer.
9. Lift the Freezer Assembly up and off of
the Adaptor of Gear box.
4. Remove the drive motor out of the gear
reducer.
NOTE: Throughly evacuate the System to
remove moisture and non - condensables.
B. To replace the drive Motor reverse the
removal procedure.
B. To replace the Freezer Assembly, reverse
the removal procedure.
9.
7.
REMOVAL AND REPLACEMENT OF THE
WATER RESERVOIR ASSEMBLY
A. To remove the Water Reservoir
Assembly:
1. Remove screws and the left Panel and
the Top Panel. Close the Water Supply.
Drain water reservoir and freezer assy.
Using the drain tube attached to the freezer
water inlet.
NOTE: Be prepared with container or rags,
to catch water left in lines, when lines are
disconnected in next steps, to prevent
draining water on parts, components,
electrical lines, etc.
2. Disconnect the water inlet tube from the
Water Reservoir Assembly.
3. Remove two corbin clamps and two
tubes from the bottom of the water reservoir assy
and damp all water in them by bending them
down in a pail.
4. Unscrew and remove the screws that
secure the water reservoir bracket.
Scotsman-webshop.nl
REMOVAL AND REPLACEMENT OF
GEAR BOX
A. Remove screws and all service panels.
1. Remove four nuts and washers which
hold the gear box adaptor to the evaporator
assembly.
2. Unloose and remove screws securing
upper evaporator bracket to left side chassis.
3. With a small hydraulic Hoist raise the
evaporator assembly to facilitate removal of entire
gear box.
4. Unloose and remove four nuts holding
the gear box to unit base. The gear box is now
loose and can be removed. Do not tilt to avoid oil
spillage.
NOTE: Gear box is supplied with the drive
motor already in place.
B. To remount Gear Box assembly reverse the
removal procedure taking care to position correctly
the output shaft with its keys well in shape.
Page 15
Page 15
SECTION V
SERVICE DIAGNOSIS
The Service Diagnosis Sections is for use in
aiding the servicemen in diagnosing a particular
problem for pin-point the area in which the
problems lies, thus an ever available reference
for proper corrective action.
1.
The following chart lists corrective actions for
the causes of known symptoms of certain
problems that can occur in the ice
makingrefrigeration system.
ICE MAKING - REFRIGERATION SYSTEM
SYMPTON
POSSIBLE CAUSE
SUGGESTED CORRECTION
2nd Warning Light glows
Lo-water pressure.
Intermittent water supply
or too low water pressure.
Water shut-off valve closed.
Check and clean water strainer
The unit does not make ice.
Drive coupling worn or splitted.
Unloose and pull-ont gear box
and change coupling.
Gear in gear box stripped.
Check and replace.
Water not entering
freezer assy.
Check water line from reservoir
to freezer.
Loose electrical connection
Check wiring.
Inoperative master switch.
Replace switch
Ice inside the plastic spout
Remove it and check reason why
Inoperative Spout Switch
Replace it
Ice in contact with the bin
thermostat bulb
Remove it and check reason why
Bin thermostat out of order
Replace it
Machine located in a very cold
room temperature
Move it to a warmer place (min.
room temp. +10°C)
Wrong connection of the three
phase to the unit plug
Reverse two of them
Short of one of the three phases
Check for proper power supply
Auger rubbing in freezer barrell Freezer barrell scored.
Remove auger to check situation
smooth freezer barrel and auger spiral
with send paper or replace them.
Auger bearing seized.
Gear box seized - No lubricant.
Freeze up.
Replace bearing.
Add lubricant or replace gear box.
Melt ice in freezer and remove ice
breaker and auger to check cause
of freezer-up.
Drive motor running on reverse.
Interchange connection wires.
Green Light is off. Unit
will not run
3rd Warning light glows
4th Warning light glows
5th Warning light glows
6th Warning light glows.
Cut OFF at Drive
Motor Current Relay
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Page 16
Page 16
SYMPTON
POSSIBLE CAUSE
SUGGESTED CORRECTION
Excessive noise.
Gear reducer loose on frame.
Tighten.
Drive motor end-play or
worn bearings.
Repair or replace.
Water level in evaporator
too low.
Set water level correctly
Damaged water seal.
Replace seal.
Gravity feed line leaking.
Check hose clamp.
Water level in reservoir too high.
Adjust water level.
Surrounging air temperature
above 40°C (100°F).
Correct or move unit to cooled
location.
Under-or over-charge of
refrigerant.
Re-charge with proper
amount.
Closed AEV.
Adjust valve for correc
refrigerant flow.
Float ball full of water.
Replace.
Loss of refrigerant, under
or overcharge of refrigerant.
Check and recharge with
proper amount of refrigerant.
Low water level in the reservoir.
Check float valve operation.
Overcharge of oil in system.
Check at oil sight glass.
Lower to 1/2 sight glass.
Low on lubricant.
Remove filling plug and
add synthetic Oil.
Water leaks.
Making wet ice.
Low ice production.
Gear box noise.
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Page 17
Page 17
SECTION VI
WIRING DIAGRAMS
This section is provided as an aid in understanding
the electrical circuit of the MF/MFN 88.
WARNING - When conducting a conti-nuity
check of the MF/MFN 88:
The Wiring Diagrams in this Sections is:
1. Disconnect the main power source.
Wiring diagram - MF/MFN 88 AS (400/50/3+N).
2. DO NOT use an incandescent lamp or
jumper wire, conduct all tests with a
voltohm-meter.
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Page 18
Page 18
WIRING DIAGRAM MF/MFN 88
LEGEND
F1
3-PHASE MONITORING RELAY
FC1
SPOUT SWITCH
FU1
FUSE
HL1
POWER ON
HL4
WATER ALARM
HL5
SPOUT SWITCH LIGHT
HL6
BIN FULL
HL7
WRONG PHASE ALARM
HL8
CURRENT DRIVE-MOTOR ALARM
KA1
CURRENT DRIVE-MOTOR RELAY
KA3
DRIVE-MOTOR START RELAY
KM2
DRIVE-MOTOR CONTACTOR
KT1
LIQUID VALVE DELAY
KT2
DRIVE-MOTOR TIMER DELAY
M2
DRIVE MOTOR
SB1
RESET PUSH BUTTON
SP3
WATER PRESSURE CONTROL
ST1
THERMOSTAT
TM2
DRIVE MOTOR TERMAL
PROTECTION
YV1
LIQUID VALVE
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Page 19
Page 19
SECTION VII
MAINTENANCE & CLEANING INSTRUCTIONS
GENERAL
The periods and procedures for maintenance
and cleaning are given as guides and are not to
be construed as absolute or invariable. Cleaning
especially will vary, depending upon local water
conditions and the ice volume produced and,
each icemaker must be maintained individually,
in accordance with its own particular location
requirements.
ICEMAKER
THE FOLLOWING MAINTENANCE SHOULD
BE SCHEDULED AT LEAST TWO TIMES PER
YEAR ON THIS ICEMAKER. CALL YOUR
AUTHORIZED SCOTSMAN SERVICE AGENCY.
1. Check and clean optional water line strainers
or water purification system.
2.
10. Inspect the top bearing in the ice breaker,
wipe clean of old grease and apply a coating of
food grade grease, SCOTSMAN P/N 263612.00
or equivalent.
11. Check for refrigerant leaks.
12. Check for water leaks. Pour water down
drain line to be sure that drain line is open and
clear.
13. Check the quality of ice. Ice should be
slightly wet when formed, but will cure rapidly to
normal hardness in the bin.
14. Check the bin thermostat control bulb, hold
ice on the control bulb of each system to test
icemaker shut-off.
NOTE. The bin thermostat is factory se at
4°C differential and should keep the entire
icemaker system shut off at least 10 minutes
in high ambient temperatures, longer in low
ambients temperature during normal
operation. Settings are 1,5°C CUT-OUT and
4°C CUT-IN.
Remove screws and top and front panel.
3. Remove cover from water reservoir and
depress the float to ensure that a full stream of
water enters each reservoir.
4. Check that the icemaker cabinet is level, in
side-to-side and front-to-rear directions.
5. Check that the water level in water reservoir
is below the overflow and is level to correspond
20 m/m below the ice discharge opening.
6. Clean water reservoir and interior of the
freezer assembly, using a solution of SCOTSMAN
Ice Machine Cleaner. Refer to CLEANINGIcemaker.
NOTE. Cleaning requirements vary
according to local water conditions and
individual user operation. Visual inspection
of the auger before and after cleaning will
indicate frequency and procedure to be
followed in local areas.
7. When doubtful about refrigerant charge,
install refrigerant gauges on Service valves and
check gauge. See Nameplate for refrigerant
charge specifications at liquid line: will be 1.7 Bar
(24 PSI).
8. Check drive motor operation:
Normal operating temperatures about 70° which
is hot to touch. Check with Ammeter amps drawn
and make sure they are in the limits of Drive motor
windings.
9. Check setting and function of all the pressure
controls also make sure that their corresponding
light will glow.
15. Check gear box oil level through its sight
glass every 6 months. Oil, on low speed section,
must be replaced every 25.000 hrs. Use
Syntetic Oil Shell Tivela SC320.
CLEANING
1. Remove screws and the top, left and front
panel.
2.
Disconnect unit from power supply.
3. Remove reservoir cover and block the float
in water reservoir.
4. Drain the water reservoir and freezer
assembly using the drain tube attached to the
freezer water inlet. Return the drain tube to its
normal upright position and replace the end cap.
WARNING - SCOTSMAN Ice Machine
Cleaner contains Phosphoric and
Hydroxyacetic acids. These compounds
are corrosive and may cause burns. If
swallowed, DO NOT induce vomiting. Give
large amounts of water or milk. Call
Physician immediately. In case of external
contact flush with water. KEEP OUT OF
THE REACH OF CHILDREN.
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Page 20
Page 20
5. Prepare cleaning solution: Mix 1 liter of
SCOTSMAN Ice Machine Cleaner with 10 liters
warm water.
10. Flush-out the remaining cleaning solution
from freezer, as per step 4 Wash and rinse the
water reservoir.
6. Slowly pour the cleaning solution into water
reservoir until it is full.
11. Remove the block from the float in the water
reservoir and allow new fresh water to fill up the
freezer. Plus IN again the unit.
7. Plus IN again the unit and after 15 minutes,
as the ice maker begins to use water from the
reservoir, continue to add more cleaning solution
to maintain full reservoir, if any has remained.
8. Continue icemaking, clearing ice from the
spout, until the water reservoir is empty. DO NOT
allow the icemaker to operate with empty
reservoir.
9.
Unplug again the unit.
Scotsman-webshop.nl
12. Continue icemaking for at least 15 minutes,
to eliminate any remanent of the cleaning solution.
Check ice for acid taste - continue icemaking until
ice tastes sweet.
CAUTION - DO NOT use ice produced
from the cleaning solution. Be sure none
remains in the bin.
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