Scotsman NM1250R Operator’s Manual

INTRODUCTION

NM1250R

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 NM1250R is a remote condenser modular ice system that produces up to 1400 lbs. of nugget ice in 24 hours at 90 water.

F. air and 700 F.

It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control; stackable with kit KSTACK30; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and R-502 as the refrigerant.

TABLE OF CONTENTS

For the Installer

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

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Removal and Replacement

Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Watert Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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

November, 1988

Page 1

BASIC

ELECTRICAL

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

MINIMUM

CIRCUIT

AMPACITY+

9.5 na

NM1250R

FOR THE INSTALLER

The NM1250R is designed to fit the following Scotsman storage bins:

B590 and extensions (with bin top KBT18) HTB500 or BH500 BH800 using bin top KBT15 BH1000 using bin top KBT16

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

Correct Condenser Correct Bin Correct Ice Machine Correct Bin Top (if required) Correct Precharged line set Fan Relay kit (if needed) All kits, legs, and information required for the

specific job.

before beginning:

SPECIFICATIONS: ICEMAKER

MODEL DIMENSIONS

(without bin) H" x W" x D"

NM1250RE-32A

NM1250RE-3A

27 x 30 x 24

same

COND.

TYPE

REM0TE-

AIR

COMP.

H.P.

1.75

same

ICE

TYPE

NUGGET

same

+ Minimum Circuit Ampacity is used to determine wire size per National Electric Code. The standard finish is enamel sandalwood. A stainless steel panel kit, SPKCMD-1, may be field

installed to convert the unit to a stainless steel finish.

November, 1988

Page 2

MAXIMUM

FUSE

SIZE

20 na

FOR THE INSTALLER

24"

32"

NM1250R

1.19"

Typical Storage Bin: BH800

Back View

21"

Drain

3/4" FPT

4.56"

Side View

14.69"

22.38"

31.5"

Installation Limitations:

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

Min Max Air Temperature 50 Water Temperature 40 Water Pressure 20 psi 80 psi Voltage 5% +10%

(Compared to the nameplate) The temperature limitations do not apply to the remote condenser. It will work between -20 degrees F, and 120 degrees F. 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

Front View

42"

44"

November, 1988

Page 3

32.56"

NM1250R

FOR THE INSTALLER: Remote Condenser

1/2" MALE QUICK CONNECT COUPLING FOR USE WITH RT625 OR RT640 PRECHAGED LINE SET

22"

5.75"

19.88"

5.38"

27.81"

7.94"

3.5"

6.5"

LIQUID LINE 3/8" MALE QUICK CONNECT

7.5"

COUPLING FOR USE WITH RT625 OR

RT640 PRECHARGED LINE SET

SPECIFICATIONS: REMOTE CONDENSER

MODEL DIMENSIONS

H" x W" x D"

RC1051-32A RC1052-32A

27.81" x 22" x 37.94" same

USE WITH BASIC

ELECTRICAL

1 NM1250R

1 or 2 NM1250Rs

208-230/60/1

same

MINIMUM CIRC.

AMPACITY+

same

SHIPPING

WEIGHT

84 lbs.

same

+ Included with minimum circuit ampacity for the icemaker. Use this valve to determine wire size and type between ice maker and fan motor.

RT625 Precharged line set, 25’. R502. RT640 Precharged line set, 40’. R502. KCMR230 Fan relay kit used when two icemakers are on one two circuit condenser.

ICEMAKER NAMEPLATE

LOCATED ON BACK PANEL

SERIAL PLATE LOCATED

BEHIND FRONT PANEL

November, 1988

Page 4

FOR THE INSTALLER

LEVEL THE ASSEMBLY

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 3.

NM1250R

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 bin top if required, follow the directions included 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, left, and right sides. Secure the machine to the bin with the hardware provided with the machine.

Remove the front panel and remove the styrofoam shipping blocks from under the gearmotor, the top of the ice chute, and from between the gearmotor and the right side panel.

HARDWARE SUPPLIED

GASKET

FASTEN THEMACHINE

TO THE BIN WITH THE

WITH THE ICEMAKER

November, 1988

Page 5

LOCATE REMOTE

CONDENSER

ABOVE ICEMAKER

NM1250R

FOR THE INSTALLER: Remote Condenser Installation

Location:

Limited to a 40 foot or a 25 foot length of precharged refrigerant tubing connecting the icemaker to the remote condenser. The condenser must be above or level with the highest (if stacked) icemaker.

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 icemaker, using the junction box at the back of the icemaker.

//////////////////////////////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.

REMOTE CONDENSER

PRECHARGED LINE ROUTING

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

routing and forming of the tubing is complete. See the coupling instructions, next 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.

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

November, 1988

Page 6

FOR THE INSTALLER

SERVICE PORTS

REMOTE

CONDENSER

COUPLING INSTRUCTIONS

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

are self sealing when installed properly. Carefully follow the instructions:

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

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.

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.

NM1250R

5. Connect the 3/8 inch liquid line (schrader valve end) to the remote condenser fitting marked "liquid line".

6. Connect the other end of the liquid line to the icemaker fitting marked "liquid line."

7. Connect the 1/2 inch discharge line (schrader valve end) to the remote condenser fitting marked "discharge line".

8. Connect the other end of the liquid line to the icemaker fitting marked "discharge line".

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

SCHRADER VALVE

TO REMOTE

CONDENSER

NO SHRADER

VALVE

TO ICEMAKER

3/8" LIQUID LINE

1/2" DISCHARGE LINE

November, 1988

Page 7

NM1250R

FOR THE INSTALLER: Stacking

////////////////////////////WARNING///////////////////////////

ELECTRICAL POWER MUST BE OFF

WHEN CONNECTING WIRES

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

1. Install the lower unit onto the bin.

2. Remove the top panel from the lower unit.

3. With the aid of a mechanical hoist, lift the upper machine onto the top of the lower unit. Align the rear, left, and right side panels.

4. Secure the bottom machine to the top machine with the hardware provided with the top unit: 4 cap screws, and 2 metal straps.

5. Use stacking kit KSTACK30: a) In the lower unit, remove the ice chute

cover. b) In the upper unit, temporarily remove the

ice discharge chute. c) In the lower unit, insert the chute from the

kit into the hole in the base of the upper unit, temporarily push it up into the base.

d) In the lower unit, install the new ice chute cover, then slide the connecting chute down into the hole in the new cover.

e) In the upper unit, reinstall the ice chute and cover. Remove the upper unit bin control sensors from their circuit board connections. Install the relay from the kit in the location illustrated.

f) Install interconnecting wires from the kit between the upper unit circuit board "opto" (purple wire) and "LED" (yellow wire) connections and the relay:

Purple to terminal 9. Yellow to terminal 6.

Install wire harness from lower unit through the hole in the base, and connect to the relay terminals A & B.

g) In the lower unit, remove the wire harness from the transformer to the circuit board. Connect new wire harness (just routed from the upper unit) onto transformer and circuit board.

Replace the front panels. Note: When started, the lower unit will start

first, then the upper.

November, 1988

Page 8

FOR THE PLUMBER

ICEMAKER DRAIN

3/4" FPT

CONFORM TO ALL APPLICABLE CODES

NM1250R

Water Inlet

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.

WATER

INLET

3/8" FLARE

HAND

SHUT OFF

VALVE

Drains

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.

Storage Bin: A separate gravity type drain needs to be run. Insulation of this drain line is recommended.

CONNECT TO

COLD WATER

FIELD INSTALLED

BIN DRAIN

3/4" FPT

FILTER

(OPTIONAL)

November, 1988

Page 9

NM1250R

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.

Electrically the remote condenser fan motor is connected to the icemaker 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 icemaker and at the junction box on the remote condenser.

The remote condenser must be wired to the icemaker 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 rainproof 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.

REMOTE CONDENSER

WATERPROOF (LIQUID TIGHT)

CONDUIT

ICEMAKER

JUNCTION BOX

POWER SUPPLY

November, 1988

Page 10

FOR THE ELECTRICIAN

NM1250R

FAN RELAY KIT

To install the KCMR230 fan relay kit when using (2) NM1250R icemakers and one 230 volt, two circuit remote condenser.

//////////////////////////////WARNING//////////////////////////

Do all wiring with electrical power OFF. ////////////////////////////////////////////////////////////////////////// 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.

SUGGESTED

LOCATION

FOR KCMR230

CONTROL BOX

November, 1988

Page 11

NM1250R

FOR THE ELECTRICIAN (Do this after Start Up)

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.

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

November, 1988

Page 12

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