Scotsman Ice MDT5N25 User Manual

INTRODUCTION

MDT5N25 & MDT5N40

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 machine is a combination nugget ice maker and countertop dispenser, with the option of wall mounting.

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 rotating vane to sweep the ice into the dispensing chute.

Table of Contents

FOR THE INSTALLER: Specifications···································· Page 2

FOR THE INSTALLER: Environmental Limitations ····························· Page 3

FOR THE INSTALLER············································ Page 4

FOR THE INSTALLER: Wall Mount Kit ··································· Page 5

FOR THE PLUMBER ············································ Page 6

FOR THE ELECTRICIAN ·········································· Page 7

FOR THE INSTALLER: Final Check List ·································· Page 8

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

COMPONENT DESCRIPTION ······································· Page 10

COMPONENT DESCRIPTION ······································· Page 11

COMPONENT DESCRIPTION: Control Box ································ Page 12

ELECTRICAL SEQUENCE ········································· Page 13

OPERATION: Water ············································· Page 14

OPERATION: Refrigeration ········································· Page 15

OPERATION: Ice Vending ·········································· Page 16

DISPENSE AREA SANITATION······································· Page 17

CLEANING and SANITIZING ········································ Page 18

MAINTENANCE AND CLEANING······································ Page 19

SERVICE DIAGNOSIS ··········································· Page 21

SERVICE DIAGNOSIS: Circuit Board ···································· Page 23

REMOVAL AND REPLACEMENT ······································ Page 24

REMOVAL AND REPLACEMENT: Bearing And Breaker ·························· Page 25

REMOVAL AND REPLACEMENT: Water Seal ······························· Page 27

TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY ······················· Page 29

REFRIGERATION SERVICE: R-404A (HP62) ······························· Page 30

REFRIGERATION SERVICE ········································ Page 31

CIRCUIT BOARD SERVICE········································· Page 32

LIQUID CHARGING ············································ Page 32

Parts Lists and Wiring Diagrams are printed on

Note this symbol when it appears.

yellow paper in the center of this manual.

This manual was printed on recycled paper. Keep it for future reference.

May 2001

Page 1

It marks a possible hazard.

MDT5N25 & MDT5N40

FOR THE INSTALLER: Specifications

This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop, or using wall mounting kit KWB3, hung from a wall. The sink may be retained, or removed and the optional longer splash panel (KSP5) installed in place of the original. Instructions for each kit are included in this service manual.

20.5"

14.06"

2.56"

1.88"dia

Before beginning the installation, check that all the materials and kits required are available at the installation location.

NAMEPLATE

on back panel

3.54"

4.5"

3/8" FPT condenser Water Inlet (Water Cooled)

ELECTRICAL JUNCTION BOX

3/8" Flare Potable Water Inlet

Optional for water and

drain lines

22.5"

Serial Number Plate

inside on upper base

SPECIFICATIONS

Model Number Dimensions (w/o stand)

H”xW”xD”

Basic

Electric

1/2" FPT Cond. Drain (Water Cooled)

Cond.

Type

3/4" FPT Drain

Ref. Charge,

R-404A in ounces*

12.27"

1.12"

Minimum Circuit

Ampacity

3.12"

MDT5N40A-1B 48.5 x 26 x 22.5 115/60/1 Air 24 19.3 25

MDT5N40W-1A same 115/60/1 Water 18 17.8 20

MDT5N40W-1B same 115/60/1 Water 17 17.8 20

MDT5N40A-6B same 230/50/1 Air 24 11 15

MDT5N40W-6A same 230/50/1 Water 18 10.4 15

MDT5N40W-6B same 230/50/1 Water 17 10.4 15

MDT5N25A-1B 41 x 26 x 22.5 115/60/1 Air 24 19.3 25

MDT5N25W-1A same 115/60/1 Water 18 17.8 20

MDT5N25W-1B same 115/60/1 Water 17 17.8 20

MDT5N25A-6B same 230/50/1 Air 24 11 15

MDT5N25W-6A same 230/50/1 Water 18 11 15

MDT5N25W-6B same 230/50/1 Water 17 11 15

5.12"

6.43"

Maximum Fuse Size

* Refrigerant charge change between A and B water cooled. Always check the nameplate for charge info.

June 2002

Page 2

MDT5N25 & MDT5N40

FOR THE INSTALLER: Environmental Limitations

Installation Limitations

This ice system is designed to be installed indoors, in a controlled environment.

Minimum Maximum

Air Temp 50

Water Temp 40

F. 1000F.

Water Pressure 20 PSI 80 PSI

Voltage (115v) 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.

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

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 are subject to change without notice.

Service Limitations

Do not install in a location where the top of the machine is within 6" of a fixed ceiling. Do not install air cooled models in a location where there is less than 6" clearance to the left and right of the cabinet.

CEILING

CUT AWAY

WALL

CUT AWAY

SPACE ABOVE

FOR

SERVICE

Water Limitations

An ice machine is a food manufacturing plant; it takes 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 produce 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 than 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.

6" SPACE

FOR AIR

(A/C)

Airflow

SPACE

FOR

UTILITIES

6" SPACE

FOR AIR

(AIR COOLED)

May 2001

Page 3

MDT5N25 & MDT5N40

FOR THE INSTALLER

Location

After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space above and behind it for service. Air cooled models require a minimum of 6 inches to the left and right of the machine for air circulation.

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 icemaker-dispenser. Place the cabinet onto the machine stand, so that the unit is lined up with the holes. Secure the ice maker-dispenser to the machine stand with bolts and washers.

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.

Unpack and install the ice and water spouts.

Ice Spout: Slide up and over ice outlet. No

fastener is required to hold it in place.

Water Spout: Slide over stainless steel water discharge tube, locate and match up with notches in the base. Rotate clockwise to move spout into installed position.

SEAL THE

UNIT TO

THE

COUNTER

OR STAND

Water Spout

Ice Spout

May 2001

Page 4

FOR THE INSTALLER: Wall Mount Kit

CAUTION

It is recommended that the wall mounting installation be done by an experienced contractor. The weight of the machine when in use may exceed 350 pounds. The unit should be mounted on a solid, rigid wall with proper fasteners for that type of wall and of adequate strength to support the weight of the machine when in use.

Clearance between the wall and the icemaker is a maximum of 1 inch. Check utility connections first. The electrical junction box will have to be removed, and the electrical connections made inside the cabinet in compliance with local codes. The plumbing connections may be made through the base, or at either side through the pre-punched holes, using standard plumbing practices.

Interior plumbing lines must be disconnected from the original connections and plugged when routing through the side or base.

1. Remove machine top. Attach bracket “A” to machine using (3) nuts, (3) flat washers, (3) lock washers, and (3) 5/16-18 bolts received with the kit.

MDT6N40=38.6"

MTD6N25=30"

7.83

MDT5N25 & MDT5N40

BASE HOLE

1" CLEARANCE

SIDE

ROUTIN

16"

DO NOT LIFT ON SINK

2. Mount brackets “B” and “C” to the wall at the dimensions shown for the unit. (hardware for this is not included).

Use fasteners and wall of sufficient strength to carry the use and weight of the icemaker-dispenser.

3. Lift unit up and hook bracket “A” over bracket

12"

“B”. Slide unit until the two remaining holes are aligned and secure with the remaining (2) 1/4-20 bolts, flat washers and lock washers.

May 2001

Page 5

MDT5N25 & MDT5N40

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

Air Cooled Models: The recommended water supply is clean, 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 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: A separate 3/8" O.D. copper line is recommended, with a separate hand valve to control it. It is connected to a 3/8" FPT condenser inlet at the back of the cabinet. The water pressure to all lines must always be above 20 psig, and below 80 psig.

WATER INLET

CABINET

DRAIN

OPTIONAL

WATER

FILTER

Drains

Air Cooled Models: There is one 3/4" FPT drain at the back of the cabinet, the drain line is of the gravity type, and 1/4 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 3/4" rigid tubing.

Water Cooled Models: In addition to the above mentioned drain, a separate condenser drain must be installed. Connect it to the 1/2" condenser drain connection at the back of the cabinet.

WATER INLET

SHUT OFF

VALVE

VENTED

DRAIN TUBE

FLOOR DRAIN

WATER COOLED DETAIL

Condenser

WATER INLET

May 2001

Page 6

POTABLE

WATER INLET

CABINET

DRAIN

Condenser

DRAIN

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

The electrical power to the unit is supplied through 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.

MDT5N25 & MDT5N40

INDIVIDUAL CIRCUIT FOR ICE DISPENSER

JUNCTION

BOX

July 2003

Page 7

MDT5N25 & MDT5N40

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 disconnect (switch or plug as required) 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?

6. Is there a minimum of 6 inches of clearance at the top and back of the machine for service and utility connections?

BACK VIEW OF COMPLETED INSTALLATION

ELECTRICAL?

LEVELED?

ICEMAKER

DISPENSER

PLUMBING?

Wall mounted only: Is the machine properly installed and secured to the wall?

7. Is there a water shut off valve installed near the machine?

MACHINE

STAND

July 2003

Page 8

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 master switch on. The electrical start up sequence is automatic; there will be a short (15 second) delay before the machine starts.

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.

5. The unit should soon be making ice. If desired, the low side pressure may be checked: it should be 38 PSIG + or - 2 PSIG.

The air cooled discharge pressure will depend upon air and water temperatures, but should be between 240 PSIG and 340 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.

MDT5N25 & MDT5N40

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 by wiping it with a mixture of 1 ounce of household bleach to 2 gallons of water, allow to air dry. Replace all covers and panels. Switch the icemaker-dispenser back on.

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.

7. Check ice dispensing by holding a container in front of the Touch Free ice sensor (just below the ice delivery spout). Ice should flow from the spout when a container is present, and stop dispensing when the container is removed.

May 2001

Page 9

MDT5N25 & MDT5N40

COMPONENT DESCRIPTION

High Pressure Cut Out Switch: A manual 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 ice making will stop. Ice is dispensed through a chute at the bottom front when the bin vane sweeps the ice over the chute.

ICE LEVEL SENSORS

WATER LEVEL

SENSOR

EVAPORATOR

RESERVOIR

DRAIN TUBE

CONDENSER

HIGH PRESSURE

CUT OUT

ICE STORAGE BIN

TOUCH FREE SENSOR

May 2001

Page 10

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