Scotsman MDT6N Installation Manual
INTRODUCTION
MDT6N90
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 maker-dispenser.
The MDT6 is a combination nugget ice maker and
countertop dispenser. A water station is standard.
Table of Contents
FOR THE INSTALLER: Specifications ······························ Page 2
FOR THE INSTALLER ······································ Page 3
FOR THE PLUMBER ······································· Page 4
FOR THE ELECTRICIAN ····································· Page 5
FOR THE INSTALLER: Final Check List ····························· Page 6
INITIAL START UP ········································ Page 7
COMPONENT DESCRIPTION ·································· Page 8
COMPONENT DESCRIPTION ·································· Page 9
CONTROL BOX ········································· Page 10
ELECTRICAL SEQUENCE ···································· Page 11
OPERATION: Water ······································· Page 12
OPERATION: Refrigeration ···································· Page 13
OPERATION: Ice Vending ···································· Page 14
DISPENSE AREA SANITATION ································· Page 15
CLEANING and SANITIZING ··································· Page 16
SENSOR MAINTENANCE ···································· Page 17
BEARING MAINTENANCE ···································· Page 18
AUGER MAINTENANCE ····································· Page 19
SERVICE DIAGNOSIS ······································ Page 20
CONTROL SYSTEM DIAGNOSTICS ······························ Page 21
REMOVAL AND REPLACEMENT ································ Page 22
REMOVAL AND REPLACEMENT: Bearing And Breaker ···················· Page 23
REMOVAL AND REPLACEMENT ································ Page 24
REMOVAL AND REPLACEMENT: Water Seal ·························· Page 25
REMOVAL AND REPLACEMENT ································ Page 26
TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY ·················· Page 27
REFRIGERATION SERVICE ··································· Page 28
The ice making section is equipped with the
following features: electronic controls for bin level
and low water; thermostatic expansion valve; front
service for most components; and R-404A
refrigerant. The ice dispensing section is a
seamless plastic storage bin, with a stainless steel
ice agitator at the bottom to sweep the ice into the
dispensing chute.
This manual was printed on recycled paper.
Keep it for future reference.
Note this symbol when it appears.
It marks a possible hazard.
May 2001
Page 1
MDT6N90
FOR THE INSTALLER: Specifications
This ice maker-dispenser is designed to be
mounted on a machine stand, or a countertop.
Before beginning the installation, check that all the
materials and kits required are available at the
installation location.
Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They meet or exceed the
standards of U.L., N.S.F., and C.U. L.
3/8" FPT
Cond. Water
Inlet
(W/C)
1/2" FPT
Cond. Drain
(W/C)
3/4 FPT
Drain
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 parts 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 designs are subject to change
without notice.
BACK VIEW
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.
General recommendations
Electrical Junction
Box
3/8" Flare
Water Inlet
are:
1. Filter the water used to
produce ice.
2. Check with a water
treatment specialist for a water
test, and any
6.63"
12.5"
4.63"
recommendations regarding
filters and treatment.
.75"
3/4" FPT
Drain
Model Number Model
Series
3.84"
5.59"
17.59"
Dimensions
(w/o stand)
H"xW"xD"
2.63"
Condenser
Type
Refrigerant
7.93"
Charge
(R-404A)
Basic
Electrical
Minimum
Circuit
Ampacity*
MDT6N90A-1 J 45.74 x 35.18 x 29.26 Air 32 115/60/1 18.1 25
MDT6N90W-1 J same Water 19 115/60/1 16.5 20
MDT6N90AS-1 A or B same Air 32 115/60/1 18.1 25
MDT6N90WS-1 A same Water 22 same 16.5 20
MDT6N90WS-1 B same Water 19 same 16.5 20
*Minimum circuit ampacity is used to determine wire size and type per National Electric Code.
Options: Machine stand DMS31.
August 2010
Page 2
Max.
Fuse
Size
FOR THE INSTALLER
MDT6N90
Location
This ice system is designed to be installed indoors,
in a controlled environment.
Minimum Maximum
Air Temp 50
Water Temp 40
0
F. 1000F.
0
F. 1000F.
Water Pressure 20 psi 80 psi
Voltage 104 126
Operating the machine outside of the above
limitations, or outdoors, is potentially damaging to
the machine; also it is misuse of the machine
which may void the warranty.
Service Limitations
Do not install in a location where the top of the
machine is within 6" of a fixed ceiling. Air cooled
models require a minimum of 6 inches to the left
and right of the machine for air circulation. It is
important that the machine be installed in a
location where it has enough space above and
behind it for service.
After uncrating and inspection, the unit is ready for
installation.
Machine Stand Installation
Tip the stand on its back and install the legs, return
the stand to the upright position. Adjust leg levelers
so that the stand does not “rock”.
Counter Top or Machine Stand Installation
The base of the icemaker-dispenser must be
sealed to the object it rests upon. Food grade
silastic sealant such as Scotsman part number
19-0529-01 is recommended.
Place a bead of the sealant on the machine stand
or counter top to match the outside edge of the
cabinet base and sink.
The icemaker-dispenser is heavy: use of a
mechanical hoist is recommended to lift it to the
height required to install it.
The DMS machine stand has holes in the top that
match up with threaded holes in the base of the
machine. Secure the machine stand to the base
with 4 5/16" bolts.
In both counter top and machine stand
installations, wipe off and neatly smooth any
excess sealant. Level the machine stand and
cabinet.
Unpack and install the sink brackets. Fit the sink
assembly onto the two sink brackets, and press
onto the bead of sealant. Wipe off and neatly
smooth any excess sealant from under the sink
edge. Connect the sink drain to the dispenser drain
system.
Airflow
SEAL
ICEMAKER-
DISPENSER TO
THE COUNTER
TOP OR
MACHINE STAND
May 2001
Page 3
MDT6N90
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
Water Inlet
Air Cooled Models: Connect a clean, potable
and cold water supply to the
back of the cabinet. Install a hand valve near the
machine to control the water supply. Use
copper tubing.
Water Treatment: In most areas, a water filter of
some type will be useful. In areas where the water
is highly concentrated with minerals the water
should be tested by a water treatment specialist,
and the recommendations of the specialist
regarding filtration and/or treatment should be
followed.
Water Cooled Models: Connect a separate
O.D. copper line, with a separate hand valve to
control it, to the
3
” FPT condenser inlet at the
8
back of the cabinet. The water pressure to all lines
must always be above 20 psig, and below 120
psig.
3
” male flare at the
8
3
8
” O.D.
3
”
8
INLET WATER
Drains
Air Cooled Models: Connect a drain tube to the
one ¾” FPT drain fitting (plastic) at the back of the
cabinet, the drain line is of the gravity type, and ¼
inch per foot fall is an acceptable pitch for the
drain tubing. There should be a vent at the
highest point of the drain line, and the ideal drain
receptacle would be a trapped and vented floor
drain. Use only ¾” rigid tubing.
WATER COOLED
CONDENSER
WATER INLET
CONDENSER
DRAIN
Water Cooled Models: In addition to the above
mentioned drain, a separate condenser drain line
must be installed. Connect it to the ½ " condenser
drain connection at the back of the cabinet.
VENTED
DRAIN
OPTIONAL
WATER
FILTER
SHUT OFF VALVE
FLOOR DRAIN
May 2001
Page 4
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
Connect the electrical power supply for the unit to
the wires in the junction box at the rear of the
machine.
Check the nameplate (located on the back panel)
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 its own
electrical circuit so it would be 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 a
licensed electrician is required to
perform the electrical installation.
MDT6N90
POWER SUPPLY
ELECTRICAL
CONNECTION
May 2001
Page 5
MDT6N90
FOR THE INSTALLER: Final Check List
1. Is the icemaker-dispenser installed
indoors, in a location where the air and
water temperatures are controlled, and
where they do not go beyond design
limitations?
2. is there an electrical service
disconnect within sight of the installed
machine? Is the machine on a separate
circuit? Has the voltage been checked
and compared to nameplate
requirements?
3. Have all of the plumbing connections
been made and checked for leaks?
4. Has the machine been leveled?
5. Is there a minimum of 6 inches of
clearance at the left and right sides of an
air cooled machine?
ELECTRICAL?
LEVELED?
6. Is there a minimum of 6 inches of
clearance at the top and back of the
machine for service and utility
connections?
7. Is there a water shut off valve installed
near the machine?
8. Have all of the shipping blocks been
removed?
WATER
INLET?
DRAINS?
May 2001
Page 6
INITIAL START UP
Pre Start Inspection
1. Remove the two front panels.
2. Check that all shipping blocks have been
removed.
3. Remove any and all packing tape (check inside
the storage bin).
4. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant lines are
rubbing each other. Check that the fan blade on air
cooled models turns freely.
5. Check that the machine is installed correctly
according to the final check list.
Start Up
1. Go through the pre start inspection.
2. Open the water hand valve, observe that water
enters the water reservoir, fills the tube from the
reservoir to the evaporator and then shuts off.
Check for leaks.
3. Switch the mode switch to ON. The auger drive
motor and compressor start, beginning the ice
making process.
4. On air cooled models, warm air will begin to flow
from the condenser. Water cooled models will
begin to discharge warm water down the drain.
MDT6N90
7. Check ice dispensing by pushing in on the glass
filler lever. Ice dispenses are portion controlled; by
turning a knob, the length of time the unit
dispenses when the glass filler lever is pushed
(and the amount of ice dispensed) is adjusted.
8. Switch off the icemaker-dispenser, remove the
top panel and the top of the ice storage bin.
Sanitize the interior of the ice storage bin with a
locally approved sanitizer. A possible sanitizer is a
mixture of 1 ounce of household bleach to 2
gallons of water. Wash the interior of the bin with
the sanitizing solution. Replace all covers and
panels. Switch the icemaker-dispenser back on.
5. The unit should soon be making ice. If desired,
the low side pressure may be checked: it should be
38 PSIG + or - 4 PSIG.
The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 200 PSIG and 300 PSIG.
Water cooled discharge pressure should be about
245 PSIG. If needed, adjust the water regulating
valve.
The above numbers are for new, clean machines.
Field values may be somewhat higher or lower.
6. There are no adjustments to make, so replace
the panels.
May 2001
9. Give the owner/user the service manual, instruct
him/her in the operation and maintenance
requirements of the unit. Make sure they know who
to call for service.
10. Fill out the Customer Evaluation and warranty
Registration form, and mail it in to Scotsman.
Page 7
MDT6N90
COMPONENT DESCRIPTION
ICE LEVEL SENSOR
EVAPORATOR
DRAIN
TUBE
RESERVOIR
WATER
LEVEL
SENSOR
ICE STORAGE BIN
CONTROL BOX
CONDENSER
HI
PRESSURE
CUT OUT
Control Box: Contains the electrical controls that
operate the machine.
High Pressure Cut Out Switch: An automatic
reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off if the
discharge pressure should ever exceed 450 psig.
Evaporator: A vertical stainless steel tube,
refrigerated, and water filled. In it there is a
stainless steel auger.
Reservoir: Float operated, it maintains the water
level in the evaporator at a constant level, it also
contains the water level sensor.
Water Level Sensor: Senses if there is water in
the reservoir to make ice out of. Will shut the
machine off it there is none.
Ice Level Sensor: An electronic “eye”, it senses
the presence of ice in the bottom of the ice
discharge chute. Operates to turn the ice machine
on and off automatically as the level of ice in the
bin changes.
Drain Tube: When uncapped and lowered, drains
the evaporator.
Condenser: Air or water cooled, where the heat
removed in ice making is discharged.
Ice Storage Bin Assembly: A plastic lined,
insulated cylinder that receives, stores and
dispenses the ice. Fresh ice enters at the top, and
when the bin is full enough the ice will be between
the ice level sensors, and the icemaking will stop.
Ice is dispensed through a chute at the bottom
front when the agitator assembly sweeps the ice
through the chute.
May 2001
Page 8
COMPONENT DESCRIPTION
MDT6N90
Evaporator: A refrigerated vertical tube filled with
water and containing a water seal and auger.
Auger: A solid stainless steel double spiral auger,
it pushes the ice crystals up to the top of the
evaporator.
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.
Ice Sweep: A plastic cap with “fingers”. It revolves
with the auger to “sweep” the ice into the ice chute.
Breaker: Where the ice is compressed and much
of the extra water is squeezed out of it before it is
discharged into the bin.
ICE CHUTE
Motor: A split phase motor that drives the gear
reducer.
Thrust 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.
ICE SWEEP
BEARING
BREAKER
AUGER
WATER SEAL
WATER INLET
GEAR MOTOR
EVAPORATOR
May 2001
Page 9
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