Scotsman MDT2 Installation Manual

INTRODUCTION

MDT2

This manual provides the specifications and the
step-by-step procedures for the installation,
start-up, operation, maintenance and cleaning for
the SCOTSMAN MDT2 counter top cubelet ice

NOTE: To retain the safety and performance built
into this ice machine, it is important that installation
and maintenance be conducted in the manner
outlined in this manual.

dispenser.

Table of Contents

SPECIFICATIONS ············································· Page 2

CABINET DIAGRAMS ·········································· Page 3

GENERAL INFORMATION AND INSTALLATION ···························· Page 4

ELECTRICAL CONNECTIONS ······································ Page 5

WATER SUPPLY AND DRAIN CONNECTIONS ····························· Page 6

FINAL CHECK LIST ············································ Page 7

OPERATING INSTRUCTIONS ······································ Page 8

INITIAL START UP CONTINUED ····································· Page 9

SETTING THE DISPENSING SELECTOR ································ Page 11

PRINCIPLE OF OPERATION ······································· Page 12

REFRIGERANT CIRCUIT ········································· Page 13

MECHANICAL SYSTEM ········································· Page 14

COMPONENT DESCRIPTION ······································ Page 15

COMPONENT DESCRIPTION ······································ Page 16

COMPONENT DESCRIPTION ······································ Page 17

COMPONENT DESCRIPTION ······································ Page 18

SERVICE DIAGNOSIS ·········································· Page 19

SERVICE DIAGNOSIS ·········································· Page 20

MAINTENANCE AND CLEANING INSTRUCTION ···························· Page 21

CLEANING INSTRUCTIONS OF WATER SYSTEM ··························· Page 22

REMOVAL AND REPLACEMENT ···································· Page 23

TOP BEARING REPLACEMENT ····································· Page 24

BEARING REPLACEMENT - CONTINUED ································ Page 25

WATER SEAL ··············································· Page 26

May 2002

Page 1

MDT2

SPECIFICATIONS

MDT2C12:
Ice Maker Dispenser TouchFree 200 lb ice making capacity Cublet 12 lb storage

Important operating requirements:

MIN MAX

- Air temperature 50°F 100°F

- Water temperature 40°F 95°F

- Water pressure 20 psi 70 psi

- Electrical voltage variations from
voltage rating specified on
nameplate

To keep your SCOTSMAN CUBELET DISPENSER
at peak performance levels, periodic maintenance
checks must be carried out as indicated in this
manual.

-10% +10%

MACHINE SPECIFICATIONS

Model Cond.

unit

MDT2C12-1A Air 34 13/32” high x 15 9/32” wide x 26 7/64” deep S. Steel 3/8 12 lb.

Basic
electrical

115/60/1 6 550 15

Amps Watts Amps fuse

Cabinet Size Finish Comp.

HP

Ice bin
cap

Unit is equipped with leveling legs.

The unit has a power cord.

May 2002

Page 2

CABINET DIAGRAMS

MDT2

May 2002

Page 3

MDT2

GENERAL INFORMATION AND INSTALLATION

UNPACKING AND INSPECTION

1. Call your authorized SCOTSMAN Distributor or
Dealer for proper installation.

2. Visually inspect the exterior of the packing and
skid. Any severe damage noted should be reported
to the delivering carrier and a concealed damage
claim form filled in subject to inspection of the
contents with the carrier’s representative present.

3. a) Cut and remove the plastic strip securing the
carton box to the skid.

b) Cut open the top of the carton and remove the

polystyrene protection sheet.

c) Pull out the polystyrene posts from the corners

and then remove the carton.

4. Remove the top and sides panels of the unit and
inspect for any concealed damage. Notify carrier of
your claim for the concealed damage as stated in
step 2 above.

5. Remove all internal support packing and
masking tape.

6. Check that refrigerant lines do not rub against or
touch other lines or surfaces, and that the fan
blades move freely.

7. Check that the compressor fits snugly onto all its
mounting pads.

8. Use clean damp cloth to wipe the surfaces
outside of the cabinet.

9. See data plate on the rear side of the unit and
check that local main voltage corresponds with the
voltage specified on it.

LOCATION AND LEVELING

WARNING: This Ice Dispenser is designed for
indoor installation only. If the machine is operated
for extended periods at temperatures exceeding
the following limitations it will constitute misuse
under the terms of the SCOTSMAN Manufacturer’s
Limited Warranty resulting in LOSS of warranty
coverage.

Position the unit in the selected permanent
location. Criteria for selection of location include:

Min Max
Air Temperature 50°F 100°F
Water Temperature 40°F 95°F
Water pressure 20 psi 70 psi
Voltage -10% +10%

(Compared to the nameplate)

Service access: adequate space must be left for all
service connections through the rear of the ice
machine.

This machine is air-cooled and sucks air through
the left side panel and blows air out the rear side of
the top panel. Do not install the machine where the
left and upper rear side airflows might be blocked.

A minimum clearance of 6 inches is required at the
left and upper rear side for air circulation.

It is important that the machine be installed in a
location where it has enough space around it to be
accessible for service. Avoid hot, dirty and
crowded locations.

CAUTION: Incorrect voltage supplied to the ice
machine will void your parts replacement program.

10. Remove the manufacturer’s registration card
from the inside of the Users Manual and fill-in all
parts including Model and Serial Number taken
from the data plate. Forward the completed
self-addressed registration card to SCOTSMAN
factory.

NOTE: Do NOT place anything on top of the
machine. Leave the upper louvers open for
proper air exhaust.

The base of the MDT2 must be sealed to the
counter top.

1. Place the unit in its final position.

2. Place a bead of sealant on the counter top to
match the outside edge of the cabinet base and
sink.

Food grade silastic sealant such as Scotsman part
number 19-0529-01 is recommended.

May 2002

Page 4

ELECTRICAL CONNECTIONS

See data plate for current requirements to
determine wire size to be used for electrical
connections. All SCOTSMAN ice machines require
a solid earth wire. This SCOTSMAN ice machine is
supplied from the factory completely pre-wired and
only needs to be plugged into a nearby 115 volt
outlet.

Make sure that the ice machine is connected to its
own circuit and individually fused (see data plate
for fuse size).

The maximum allowable voltage variation should
not exceed -10% and +10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to the
overload switch and motor windings.

MDT2

NOTE: All external wiring should conform to

national, state and local standards and regulations.

Check voltage on the line and the ice machine’s
data plate before connecting the unit.

May 2002

Page 5

MDT2

WATER SUPPLY AND DRAIN CONNECTIONS

GENERAL

When choosing the water supply for the ice flaker,
consideration should be given to:

a) Length of run

b) Water clarity and purity

c) Adequate water supply pressure

Water is the most important single ingredient in
producing ice - these three items are very
important.

Low water pressure, below 20 psi may cause
malfunction of the ice machine unit.

Water containing excessive minerals will tend to
produce scale build-up on the interior parts of the
water system while water that’s too soft (water
contains too few mineral salts), will produce a very
hard flaked ice.

PLUMBING CONNECTIONS MUST CONFORM
TO ALL APPLICABLE CODES

CONNECT TO POTABLE WATER ONLY

The model MDT2 is capable of having water
connections through the bottom base or through
the rear bottom side of the machine. In this second
case it is necessary to remove the small panel at
the bottom rear.

WATER DRAIN

The recommended drain tube is a copper, rigid
plastic or reinforced flexible tubing (supplied) with
.75" (19mm) I.D. which runs to an open trapped
and vented drain. When the drain is a long run,
allow1/4" drop per foot.

Note: Although soft, easily kinked vinyl tubing is
not recommended for a drain, a short length of ¾”
ID vinyl tubing is required to connect a rigid drain
tube to the 20 mm (25/32”) fitting on the back of
the MDT2.

Install a vertical open vent on the drain line high
point at the drain connection to ensure good
draining.

The ideal drain receptacle is a trapped and vented
floor drain.

NOTE: The water supply and the water drain
must be installed to conform with the local
code. In some case a licensed plumber and/or a
plumbing permit is required.

WATER SUPPLY

Connect to the 3/4" male water inlet fitting, using
the supplied fitting, to the cold water supply line. A
shut-off valve should be installed in an accessible
position between the water supply line and the unit.

If the water contains a high level of impurities,
consider installing a water filter or conditioner.

May 2002

Page 6

FINAL CHECK LIST

1. Is the unit in a room where the ambient
temperatures are within a minimum of 50°F even in
winter months?

2. Is there at least a 6" clearance around the unit
for proper air circulation?

3. Is the unit level?

4. Have all the electrical and plumbing connections
been made, and is the water supply shut-off valve
open?

5. Has the voltage been tested and checked
against the data plate rating?

6. Has the water supply pressure been checked to
ensure a flowing water pressure of at least 20 psi.

7. Check all refrigerant lines and conduit lines to
guard against vibrations and possible failure.

8. Has the unit been sealed to the counter top?

MDT2

9. Has the owner/user been given the Users
Manual and been instructed on the importance of
periodic maintenance checks?

10. Has the Manufacturer’s registration card been
filled in properly? Check the model and serial
number against the serial plate and mail the
registration card to Scotsman.

11. Has the owner been given the name and the
phone number of the authorized SCOTSMAN
Service Agency serving them?

May 2002

Page 7

MDT2

OPERATING INSTRUCTIONS

INITIAL START UP

After having correctly installed the ice machine and
completed the plumbing and electrical connections,
perform the following “Start-up” procedure.

Remove the control board inspection panel and
cover to view the lights on the control board.

A. Open the water supply line shutoff valve and
turn the main switch on the power supply line to
the ON position.

The GREEN LED will glow to signal that unit is
under power.

NOTE: Every time the unit is turned on after being
shut off for a period of time (electrically
disconnected) the 2

nd

RED LED will blink for 3

minutes (Fig.1).

Fig 1

B. After 3 minutes have elapsed – the stand by
period – the unit starts operating by activating
systems in following sequence:

1. GEAR MOTOR

2. COMPRESSOR

3. FAN MOTOR – which is controlled by the
condenser temperature sensor. The probe is
within the condenser fins.

nd

RED LED switches off (Fig. 2).

4. 2

C. Two or three minutes after compressor start up;
cubelet ice should begin dropping off the ice spout
into the storage bin.

Reset button

BLINKING – 3 MIN.
STAND-BY PERIOD

Hi cond temp when Steady

3 minute wait when Blinking

Bin empty

Auger Motor when Steady

Hi evap temp when Blinking

Fig 2

Bin full

No water

Power

Reset button

Bin empty

Hi cond temp when Steady

3 minute wait when Blinking

Auger Motor when Steady

Hi evap temp when Blinking

Bin full

No water

Power

May 2003

Page 8

INITIAL START UP CONTINUED

NOTE: If the evaporating temperature has not
dropped lower than 30° F within ten minutes of
compressor start-up, the evaporating temperature
sensor will detect the abnormal temperature and
stop the unit operation.

MDT2

OPERATION CHECKS UPON THE UNIT START
UP

D. Remove the service panels and (if needed)
connect the refrigerant service gauges to the
corresponding service valves to check both the HI
and LO refrigerant pressures.

In this circumstance, the 3rd warning YELLOW
LED will blink (Fig.3).

After diagnosing and eliminating the cause of the
poor evaporating temperature (insufficient
refrigerant in the system, inoperative compressor
or inoperative evaporator sensor), push the
RESET BUTTON on the control board.

Before resuming operation the unit will go through
the usual 3 minute STAND-BY period.

Fig 3

NOTE:The condenser temperature sensor, which
is located within the condenser fins, keeps the
head (condensing) pressure between two preset
valves.

If proper flow of cooling are is prevented by a
clogged condenser or inoperative fan motor, the
condenser temperature rises. When it reaches
158° F the condenser temperature sensor
shuts-off the ice machine and turns on the 2nd
RED WARNING LIGHT (Fig.4).

Reset button

Bin empty

Hi cond temp when Steady

3 minute wait when Blinking

Auger Motor when Steady

Hi evap temp when Blinking

Fig 4

Bin empty

Hi cond temp when Steady

3 minute wait when Blinking

Auger Motor when Steady

Hi evap temp when Blinking

Bin full

No water

Power

Reset button

Bin full

No water

Power

May 2003

Page 9