Scotsman NM1852RH User manual

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 NM1852RH (remote high side) is the

freezer portion of a commercial ice machine. It

is designed to be connected to the

condensing section of a refrigeration system,

specifically a supermarket R-22 system. It

consists of two evaporators, two gearmotors,

two liquid line valves, two control boxes, two

thermostatic expansion valves, and an EPR

valve.

For the Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17

Removal and Replacement

Bin Controls and Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25

Circuit Board Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

NM1852RH

August 1992

Page 1

FOR THE INSTALLER: Specifications

The NM1852RH is designed to fit several

Scotsman storage bins. In some cases a bin

top kit will be required.

Installation Limitations: The NM1852RH is

designed for indoor installations only. The

machine must also be in a controlled

environment where the air temperature does

not fall below 500F., or go above 1000F.

The water temperature must be between

400F. and 1000F.

The electrical power supply must not drop

below -5% of the lowest nameplate voltage or

go above 10% of the highest nameplate

voltage.

SPECIFICATIONS:

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.S.A.

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.

NM1852RH-32A 27" X 42" X 24" Nugget 208-230/60/1

2.7

16,000

Model Number Dimensions (w/o Bin)

H" x W" D" Ice

Type Basic

Electrical

Minimum

Circuit

Ampacity

Maximum

Fuse

Size

BTU’s

Required

15.53"

3.1"

SUCTION LINE CONNECTION 7⁄8"

LIQUID LINE CONNECTI0N 1⁄2"

20.84"

9.43"

5.25" 3"

17.8"

18.8"

21.66" ELECTRICAL INLET

POTABLE WATER INLET 3/8" FLARE

DRAIN 3/4" FPT

BACK VIEW

NM1852RH

August 1992

Page 2

FOR THE INSTALLER

Select the Location:

The unit can only be installed

indoors within the limitations

described on page 2.

The ice machine will have to be

connected to the buildings R-22

refrigeration system, check to be

sure that the system has enough

extra capacity to handle a

minimum of additional 16,000

BTU’s per hour @ 1100F. liquid

line temperature. Assume a 00F.

evaporator temperature.

Storage Bin:

Scotsman’s B90 will be the

presumed bin of choice. If using

the bin extension, install heavy

duty leg kit KLP4 and place the

bin into position.

Remove the paper tape from the

bin edge gasket, and install the

bin extension onto the B90.

Remove the paper tape from the

bin extension top edge, and using

a mechanical lift, install the

NM1852RH onto the top of the

storage bin assembly.

Fasten the ice machine to the bin

using (4) 5/15-18 2.5" cap screws.

Level the assembly by:

a. Turning the leg levelers in or

out on the standard legs.

b. Use shims under the heavy

duty legs of the KLP4.

Locate the Nameplate: The

nameplate is located on the back

panel of the machine, and

contains the electrical characteristics

particular to the unit being installed.

Refrigeration Installation:

The skills of a refrigeration technician are

required to connect the ice machine to the

buildings refrigeration system.

//////////////////////////////Caution/////////////////////////////

Connect to a R-22 system only.

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

Local Codes must be observed.

A P-trap should be installed where there will

be more than 10’ of vertical rise in the suction

line.

TYPICAL INSTALLATION: ALLOW ROOM FOR SERVICE ACCESS

NM1852RH

BIN

EXTENSION

B90 STORAGE

BIN

NM1852RH

August 1992

Page 3

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

Electrical Connections:

Locate the nameplate for the

current requirements, and then

determine the wire size and type

per the National Electric Code. The

machine requires a solid chassis to

earth ground wire. Refer to the

wiring diagram. The ice machine

should be connected to its own

electrical circuit, and be individually

fused.

Voltage, when the unit is under full

load, must remain within the

limitations listed on page 2.

LOW VOLTAGE CAN CAUSE

EQUIPMENT MALFUNCTION

AND/OR DAMAGE

All external wiring should conform

to the National, State, and local

electrical codes. Usually the

services of a licensed electrician

will be required.

DETAIL OF

JUNCTION BOX

JUNCTION

BOX

POWER SUPPLY

NM1852RH

August 1992

Page 4

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Supply:

The recommended water supply line is 3/8"

O.D. copper tubing, with a minimum operation

pressure of 20 PSIG, and a maximum of 120

PSIG. Connect to cold water using the male

flare connection at the back of the machine.

Install a shut off valve in an accessible space

between the ice maker and the water supply.

Drain System:

All drains are of the gravity type, and must

have a minimum of 1/4" fall per foot of

horizontal run. The drains must be installed to

conform to local plumbing codes. The use of a

vent at the machine and at the bin will allow

the system to drain properly. Use only rigid

tubing for drains; insulation of the bin drain is

recommended.

SHUT OFF

VALVE

FIELD

SUPPLIED

WATER FILTER

3/8" MALE FLARE

3/4" FPT

VENT THIS DRAIN

WATER INLET

BIN DRAIN

FLOOR DRAIN

NM1852RH

August 1992

Page 5

FOR THE INSTALLER: Final Check List

1. Is the unit installed where the air and water

temperatures are within and will remain within

the limitations for the unit?

2. Is there 6" clearance at the rear of the

machine for utility connections?

3. Has the water supply line be checked for

pressures between 20 and 120?

4. Has the unit been leveled?

5. Has the shipping material been removed

from inside the cabinet?

6. Have the electrical connections been made?

7. Have the drains been installed and checked

for leaks?

8. Has the refrigeration supply been installed

and checked for leaks?

9. Has the bin and cabinet been wiped clean

or sanitized?

10. Has the warranty registration card been

properly filled out and mailed to Scotsman?

11. Has the owner been given the service

manual and been instructed on how to

maintain the icemaker?

13. Has the owner been given the name and

telephone number of the local Scotsman

service agency?

NM1852RH

August 1992

Page 6

INITIAL START UP

1. Remove the top and front panels.

2. Open the water valve, and observe that the

two float reservoirs fill up with water and shut

off.

3. Switch on the electrical power.

4. Open the hand valves (in the liquid lines).

5. Open the ball valves (in the suction lines).

6. Switch on one master switch, and observe:

The liquid line valve opens

The gearmotor runs

Within a short time, that side of the machine

begins to make ice.

Water flows from the water reservoir, and the

float drops, letting in more water.

7. Switch on the other master switch, observe

that:

The liquid line valve opens

The gearmotor runs

Within a short time, that side of the machine

begins to make ice.

Water flows from the water reservoir, and the

float drops, letting in more water.

8. With both sides operating, the sight glass

should remain full, and the low side pressure

will be about 24 psig, + or - 2 psig. Gearmotor

amp draw should not exceed the nameplate

rating.

9. Check the system very carefully for any

refrigerant leaks, repair as needed.

NM1852RH

August 1992

Page 7

COMPONENT IDENTIFICATION

Liquid line valve(s)

These valves operate to turn the ice making

process on and off.

When the ice level drops in the ice chute, the

ice level sensor will cause the circuit board to

close the liquid line relay, which energizes the

liquid line valve for that side of the system.

The liquid line valve opens, and liquid

refrigerant flows to the thermostatic expansion

valve.

Thermostatic Expansion Valve

The metering device of each system, the

valve(s) sense the temperature of the suction

line and vary the amount of liquid refrigerant

that passes through the valve into the

evaporator, thus maintaining a constant level

of refrigeration. TXV’s are factory set. Do not

adjust unnecessarily.

DO NOT ADJUST THE TXV UNTIL THE EPR

HAS BEEN SET.

The superheat setting is 4-80F. Measure the

temperature of the evaporator outlet at the

TXV bulb, and check the low side pressure at

the EPR valve (about 24 PSIG). Convert the

pressure to temperature (using a temperature

pressure chart) and subtract the amount from

the outlet temperature. The result is the

superheat. Use an electronic thermometer.

EPR: Evaporator Pressure Regulator Valve

This valve maintains a constant pressure on

it’s inlet (evaporators) side regardless of the

pressure on the outlet (suction) side. The EPR

is factory set, adjust only if needed. After

adjusting check TXV superheat.

Evaporators:

Where the water is frozen into ice crystals. As

the water cools, it begins to turn into ice, and

the slowly turning auger lifts the ice, as it is

being made, and forces it up and out of the

"breaker" or spout where the extra water is

compressed out of the ice. The ice then drops

through the chute, into the storage bin.

LIQUID LINE

VALVE

THERMO VALVE EPR VALVE THERMO

VALVE

EVAPORATOR

NM1852RH

August 1992

Page 8

COMPONENT DESCRIPTION: Control Box

Circuit Board: Controlling the ice machine

through sensors and relays. The sensors are:

ice level, and water level. The relays are for

the gear motor (with a built in time delay to

clear the evaporator of ice when the unit turns

off) and for the liquid line valve.

Transformer: Supplies low voltage to the

circuit board.

On/Off Switch: Manual control for that side

of the machine.

ON/OFF SWITCH

TRANSFORMER

CIRCUIT

BOARD

TERMINAL STRIP

NM1852RH

August 1992

Page 9

COMPONENT DESCRIPTION: Evaporator

Evaporator: A refrigerated vertical tube filled

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.

Divider: Where the ice is compressed and

much of the extra water is squeezed out of it

before it is discharged into the bin.

Motor: A motor that drives the gear reducer.

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.

BEARING ICE SWEEP

DIVIDER

EVAPORATOR

AUGER

WATER

SEAL

MOTOR

NM1852RH

August 1992

Page 10

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