Scotsman NM952R Operator’s Manual

INTRODUCTION

NM952R

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.

The NM952R is a remote condenser modular ice system that fits a variety of Scotsman storage bins. It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and R-22 as the refrigerant.

TABLE OF CONTENTS

For the Installer

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Removal and Replacement

Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Thrust Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.

November 1992

Page 1

This manual was printed on

recycled paper.

Electrical

Inlet

NM952R

FOR THE INSTALLER

The NM952R is designed to fit the following Scotsman storage bins:

••B90 and extensions, with bin top KBT18.

••BH800 using bin top KBT15 (one unit).

••

BH800 if using two units, no bin top needed.

••BH900 using bin top KBT24 (one unit)

••BH900 with bin top KBT25 (two units side by

side

••BH550 or HTB500 using bin top KBT14.

When installing a new system, check to be sure that you have everything you need before beginning:

••Correct Bin

••Correct Ice Machine

••Correct Bin Top

••All kits, legs, and information required for the

specific job.

Back View

Allow 6" above

machine for service.

Liquid Line Connection

Discharge Line

Connection

Remote Condenser

Junction Box

SPECIFICATIONS: ICE MAKER

Model Number

NM952RE-32A

NM952RE-3A

Dimensions

(w/o bin)

H X W X D

27" x 21" x 24"

same

20.84"

Basic

Electrical

208-230/60/1 208-230/60/3

Drain

3/4" FPT

Ice Type

Nugget

same

Cond.

Type

R/Air R/Air

Water Inlet

3/8" Flare

2.96"

Refrigerant Charge*

256 ounces of R-22 * Always go by the nameplate charge.

5.25"

The Standard Finish is Enamel - Sandalwood. There is an optional stainless steel panel kit, SPKFM21 available to convert the unit to Stainless Steel. It is field installed.

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Page 2

REMOTE CONDENSER SPECIFICATIONS

27.81"

19.86"

+Included with the ice makers minimum circuit ampacity.

Use this value to determine wire size between ice maker and

fan motor.

1/2" MALE QUICK CONNECT

COUPLING FOR USE WITH

RT2225 OR RT2240

PRECHARGED LINE SET

22"

5.75"

5.38"

NM952R

32.56"

6.5"

3.5"

1.94"

5.0"

MODEL USE WITH MINIMUM CIRC.

RC1022-32 RC1222-32

DIMENSIONS H" X W" X D"

27.8" X 22 X 37.94" SAME

1 or 2 NM952R’S

LIQUID LINE 3/8" MALE

QUICK CONNECT

COUPLING FOR USE WITH

RT2225 OR RT2240

PRECHARGED LINE SET

1 NM952R

7.5"

AMPACITY+

2 2

BASIC

ELECTRICAL

208-230/60/1

SAME

RT-2225 Precharged line set, 25’, R-22 RT-2240. Precharged line set, 40’, R-22 KCMR230. Fan Relay Kit used when two 230 volt (-32) ice makers are on one 230 volt (-32) two circuit

condenser.

November 1992

ICE MAKER NAMEPLATE

LOCATED ON BACK PANEL

SERIAL PLATE LOCATED

BEHIND FRONT PANEL

Page 3

NM952R

FOR THE INSTALLER

Installation Limitations:

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

Min Max

Air Temperature 50 (Not including the remote condenser) Water Temperature 40 Water Pressure 20 PSIG 80 PSIG Voltage -5% +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 meet 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 are subject to change without notice.

F 1000F

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 around it to be accessible for service, usually a minimum of 6 inches. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the limitations described on page

Storage Bin

Tip the 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 the bin top according to the directions with the bin top.

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 unit is placed on the bin, line it up so it is even with the back side. Secure the machine to the bin with the hardware provided with the machine.

Remove the front panel and remove any shipping blocks.

Note: Be sure to allow a 6" minimum space above the top of the machine for service.

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FOR THE INSTALLER: Remote Condenser

REMOTE CONDENSER

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

NM952R

Location

Limited to a 40 foot or a 25 foot length of precharged refrigerant tubing connecting the ice maker to the remote condenser. The condenser must be above or level with the ice maker.

Select the best available location, protecting the condenser from extremes of dirt, dust, and sun.

Meet all applicable building codes. Usually the services of a licensed electrician are required.

Roof Attachment

1. Install and attach the remote condenser to the roof of the building, using the methods and practices of construction that conform to the local building codes, including having a roofing contractor secure the condenser to the roof.

2. Have an electrician connect the remote condenser fan motor to the ice maker, using the junction box at the back of the ice maker.

PRECHARGED LINE ROUTING

////////////////////////////CAUTION///////////////////////////// Do not connect precharged tubing until all routing

and forming of the tubing is complete. See the coupling instructions, page for connecting instructions.

/////////////////////////////////////////////////////////////////////////

1. Each set of precharged refrigerant lines (either 25 foot or 40 foot) consists of a 3/8 inch diameter liquid line and a 1/2 inch diameter discharge line. Both ends of each line have quick connect couplings, one end has a schrader valve connection, that end goes to the condenser.

Note: The openings in the building ceiling or wall, listed in the next step, are the minimum sizes recommended for passing the refrigerant lines through.

2. Have the roofing contractor cut a minimum hole for the refrigerant lines of 1 3/4 inch. Check local codes, a separate hole may be required for the electrical power to the condenser.

////////////////////////////CAUTION///////////////////////////// DO NOT KINK OR CRIMP REFRIGERANT

TUBING WHEN INSTALLING IT. /////////////////////////////////////////////////////////////////////////

3. Route the refrigerant lines through the roof opening.

Follow straight line routing whenever possible. Any excess tubing MUST be retained within the

building.

4. Spiral the excess length of pre charged tubing inside the building. Use a horizontal spiral (as illustrated) to avoid any traps in the lines.

5. Have the roofing contractor seal the holes in the roof per local codes.

Note: Precharged tubing contains a R-22 holding charge. The entire refrigerant charge required for the system is contained in the ice machine.

Tubing illustration shows tight spiral; a spiral in the field depends on tubing limitations. Tight spiral not required.

Traps in tubing not required, they are included as part of the Scotsman condenser and ice machine.

LOCATE REMOTE

CONDENSER

ABOVE ICE MAKER

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Page 5

NM952R

FOR THE INSTALLER: Precharged Lines

COUPLING INSTRUCTIONS

/////////////////////////////CAUTION///////////////////////////// The couplings on the sets of precharged lines are

self sealing when installed properly. Carefully follow the instructions:

//////////////////////////////////////////////////////////////////////////

Initial Connections:

1. Remove the protector caps and plugs. Wipe the seats and threaded surfaces with a clean cloth to be certain that no foreign matter remains on them.

2. Lubricate the inside of the couplings, especially the O-Rings with refrigerant oil.

••The 1/2 inch discharge line (schrader valve

end) goes to the remote condenser fitting marked "discharge line".

••The 3/8 inch liquid line (schrader valve end)

goes to the remote condenser fitting marked "liquid line".

••The 1/2 inch discharge line goes to the ice

maker fitting marked "discharge line".

••The 3/8 inch liquid line goes to the ice maker

fitting marked "liquid line".

Final Connections:

3. Begin tightening the couplings together by hand, then using two wrenches (it is important that ONLY the nut on the precharged lines be turned, the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be loose in the refrigeration system) tighten the coupling until it bottoms out or a definite increase in resistance is felt.

4. Using a marker or pen, mark a line lengthwise from the coupling union nut to the bulkhead. Then tighten the coupling and additional 1/4 turn. As the nut turns, the line will show when 1/4 turn is made.

5. After all connections are made, and after the king valve has been opened, check the couplings for leaks.

SERVICE PORTS

REMOTE CONDENSER

3/8" LIQUID LINE

SCHRADER

VALVE

TO REMOTE

CONDENSER

1/2" DISCHARGE

LINE

NO SCHRADER

VALVE

TO ICE MAKER

November 1992

Page 6

FOR THE INSTALLER: Location

ICE MAKERS

TWO UNITS ON ONE

CONDENSER

EXCESS

PRECHARGED

TUBING INSIDE

BUILDING

NM952R

REMOTE

CONDENSER

ROOF

CUTAWAY

SERVICE

ACCESS

SERVICE ACCESS

SIDE AND BACK

WALL

CUTAWAY

November 1992

Page 7

FIELD

SUPPLIED

WATER FILTER

NM952R

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

HAND SHUT

OFF VALVE

CONNECT TO

COLD WATER

WATER INLET

3/8" MALE

FLARE

VENT ICE

MAKER

DRAIN,

3/4" FPT

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.

Drains

The cabinet has a 3/4" FPT drain. connection. The drain is 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.

Storage Bin: A separate gravity type

drain needs to be run. Insulation of this drain line is recommended.

VENT BIN DRAIN

3/4" FPT

FLOOR DRAIN

November 1992

Page 8

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

NM952R

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.

TERMINAL STRIP

FOR REMOTE

CONDENSER

ICE MAKER

JUNCTION BOX

POWER

SUPPLY

Electrically the remote condenser fan motor is connected to the ice maker at the contactor terminals for the compressor and the fan motor operates whenever the compressor operates.

Electrical connections are made at the junction box at the back of the ice maker and at the junction box on the remote condenser.

The remote condenser must be wired to the ice maker in accordance with local and national electrical codes with a minimum of 18 Awg. wire with an ground bonding wire connected to the ground screws provided in both the condenser and machine field wiring boxes. All outdoor wiring must be in rain proof conduit.

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.

RAIN PROOF

CONDUIT

GROUND

THE

CHASSIS

November 1992

Page 9

NM952R

FOR THE ELECTRICIAN: Fan Relay Kit

///////////////////////////WARNING///////////////////////////// Do all wiring with the electrical power

disconnected. /////////////////////////////////////////////////////////////////////////

To install the KCMR230 fan relay kit when using (2) NM952R ice makers and one 230 volt, two circuit remote condenser.

See the remote condenser nameplate for current requirements to determine wire size to be used for electrical hookup. Refer to wiring diagram.

All external wiring should conform to the national, state and local electrical codes. Usually an electrical permit and services of a licensed electrician will be required.

1. Mount the control box in a convenient location.

2. Attach a solid earth ground wire to the ground screw.

3. Route connecting wires from the first ice maker junction box

(marked condenser fan) and connect it to the KCMR230 terminal strip marked: NO. 1 ICE MACHINE.

4. Route connecting wires from the second machine junction box

(marked condenser fan) and connect it to the KCMR230 terminal strip marked: NO. 2 ICE MACHINE.

5. Route connecting wires from KCMR230 terminal strip marked: TO REMOTE FAN and connect at the remote condenser junction box.

6. Check phasing of the electrical circuit as follows: A. The phasing of the wiring MUST now be

checked, as incorrect phasing will result in a failure of the kit relay.

POSSIBLE LOCATION

FOR KCMR230

CONTROL BOX

November 1992

Page 10

NM952R

FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up)

Below is an illustration of the KCMR230 terminal strip. Note that each terminal is marked: 1-2-3-4-5-6. For proper phasing:

Terminals #1 and #3 must be connected to the same side of the line (such as L1)

Terminals #2 and #4 must be connected to the same side of the line (such as L2).

B. Make a test with a volt meter as follows:

1. Switch on ice maker #1 first, then switch on ice maker #2.

(The compressors must be operating for this test. Do this after start up.)

2. Test with a volt meter between terminals #2 and #4, then between terminals #1 and #3. Compare the readings obtained to the ones in the following list:

C. Test terminals 1-2 = Full Voltage (208-230)

Test terminals 1-3 = No voltage Test terminals 2-3 = Full Voltage Test terminals 2-4 = No voltage Test terminals 3-4 = Full voltage Test terminals 1-4 = Full voltage D. If there is full voltage where there should be no

voltage, turn off ice maker #2, (both switches) Then turn off ice maker #1 (both switches). The connections at the KCMR230 terminal strip marked ice maker #1 must be reversed (put the wire that was on 1 on 2 and the wire that was on 2 on 1).

///////////////////////////WARNING///////////////////////////// Do all wiring with the electrical power

disconnected. ////////////////////////////////////////////////////////////////////////

November 1992

Page 11

INSULATED

PRECHARGED

REFRIGERANT

TUBING

NM952R

FOR THE INSTALLER: Completed Installation

A typical installation should generally appear as illustrated below. The remote condenser must be located above the ice maker and the precharged lines installed per the instructions on page 6.

ROOF

CUT-AWAY

November 1992

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