Scotsman NME654R Service Manual

INTRODUCTION

NME654R & FME804R

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 FME804R and NME654R are a remote
condenser modular ice systems that fit a variety of

Table of Contents

FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2
FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3
REMOTE CONDENSER SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4
Remote Condenser Location · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5
FOR THE INSTALLER: Remote Condenser · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6
FOR THE INSTALLER: Coupling Instructions · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7
FOR THE INSTALLER: Location · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8
FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9
FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10
FOR THE INSTALLER: Completed Installation · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11
FOR THE INSTALLER: Final Check List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12
START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14
COMPONENT DESCRIPTION: Control Box · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15
ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16
OPERATION: Water · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20
CLEANING & SANITIZING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21
SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 22
BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 23
AUGER AND OTHER MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24
OPERATING CHARACTERISTICS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
SERVICE DIAGNOSIS: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26
SERVICE DIAGNOSIS: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27
CONTROL SYSTEM DIAGNOSTICS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls · · · · · · · · · · · · · · · Page 29
REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 30
REMOVAL AND REPLACEMENT: Auger · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 31
REMOVAL AND REPLACEMENT: Water Seal · · · · · · · · · · · · · · · · · · · · · · · · · · Page 32
REMOVAL AND REPLACEMENT: Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · Page 33
REMOVAL AND REPLACEMENT: Gearmotor Assembly · · · · · · · · · · · · · · · · · · · · Page 34
REFRIGERATION SERVICE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 35

Scotsman storage bins. Their features include:
front service for the freezer, gearmotor, control
box, water reservoir, and bin control; an electronic
control (AutoSentry) for monitoring ice and water
level; a thermostatic expansion valve; and HP62 as
the refrigerant.

Note this symbol when it appears.

It is an alert for important safety

information on a potential hazard.

January 2000

Page 1

NME654R & FME804R

FOR THE INSTALLER

These machines are designed to fit the
following Scotsman storage bins:

SB480 and extensions (with bin top

·

KBT18)

HTB555 or BH550 using bin top

·

KBT14 or KBT20

BH800 using bin top KBT15 (one

·

unit) or KBT25 (two units).

BH801 using bin top KBT28

·

BH900 using bin top KBT24

·

NME654 Dispenser Applications

The NME654 can be placed on and
used with certain ice and ice-beverage
dispensers. Kits are required for proper
operation, see the following list:

ID150, use adapter KBT42 and

·

KNUGDIV

ID200 or ID250, use adapter KBT46

·

and KDIL-N-ID2

Cornelius ED/DF200 beverage

·

dispensers, use KBT46 and
KDIL-N-200

·

Cornelius ED/DF250 beverage
dispensers, use KBT46 and
KDIL-N-250

·

Lancer nugget ice & beverage
dispenser, use KDIL-N-L and Lancer
kit #82-3491.

SPECIFICATIONS: ICE MACHINE

Model Dimensions

W"xD"xH"

FME804RS-1A 21" x 24" x 27" 115/60/1 FLAKE R-404A 208 ounces 22.5 30

NME654RS-1A same same Nugget R-404A same same same

* Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.

Basic
Electrical

Ice Type Refrigerant

Type

May 2006

Page 2

Refrigerant
Charge

Min Circuit
Ampacity

Max Fuse
Size

FOR THE INSTALLER

NME654R & FME804R

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 (psi) 20 80
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 CUL.

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.

0

F 1000F

0

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.

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.

January 2000

Page 3

NME654R & FME804R

)

REMOTE CONDENSER SPECIFICATIONS

2.00

5.08

ERC DIMENSIONS

Model A B F G
ERC101 33

19.75

50.17

3

"10

8

3

"16

4

3

"11

4

5

"

8

2.75

14.53

Air Discharge

Air Intake

Liquid Line
.38 Quick Connect Fitting
.95

Adjustable Roof Clearance

12.00 18.00 24.00

30.48 45.72 60.95

Discharge Line
.50 Quick Connect Fitting

1.27

13

23

16

7

2.07

19

8

"

"

.53

1.35

(6

Model Use with Basic Electrical
ERC101-1 1 FME804R or 1 NME654R 115/60/1

January 2000

Page 4

RTE25 Precharged line set, 25’, R-404A
RTE40. Precharged line set, 40’, R-404A

ICEMAKER NAMEPLATE

LOCATED ON BACK PANEL

SERIAL PLATE LOCATED

Remote Condenser Location

NME654R & FME804R

Use the following for planning the placement of
the condenser relative to the ice machine

Location Limits - condenser location must not
exceed ANY of the following limits:

Maximum rise from the ice machine to the

·

condenser is 35 physical feet

Maximum drop from the ice machine to the

·

condenser is 15 physical feet

Physical line set maximum length is 100 feet.

·

Calculated line set length maximum is 150.

·

Calculation Formula:

Drop = dd x 6.6 (dd = distance in feet)

·

Rise = rd x 1.7 (rd = distance in feet)

·

Horizontal Run = hd x 1 (hd = distance in feet)

·

Calculation: Drop(s) + Rise(s) + Horizontal Run

·

= dd+rd+hd = Calculated Line Length

Configurations that do NOT meet these
requirements must receive prior written
authorization from Scotsman.

Do NOT:

Route a line set that rises, then falls, then rises.

·

Route a line set that falls, then rises, then falls.

·

Calculation Example 1:

The condenser is to be located 5 feet below the ice
machine and then 20 feet away horizontally.

5 feet x 6.6 = 33. 33 + 20 = 53. This location would

be acceptable

Calculation Example 2:

The condenser is to be located 35 feet above and
then 100 feet away horizontally.

35 x 1.7 = 59.5. 59.5 +100 = 159.5. 159.5 is

greater than the 150 maximum and is NOT
acceptable.

rd

22.87"

dd

17.15"

Remote

Condenser

Located ABOVE

Ice Machine

Remote

Condenser

Located BELOW

Ice Machine

40.35"

hd

Condenser Distance and
Location Schematic

January 2000

Page 5

NME654R & FME804R

FOR THE INSTALLER: Remote Condenser

Location

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

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 machine, using the
junction box at the back of the ice machine.

PRECHARGED LINE ROUTING

CAUTION

Do not connect precharged tubing until all routing
and forming of the tubing is complete. See the
coupling instructions for connecting information.

4. Spiral the excess length of pre charged tubing
inside the building. Use a horizontal spiral (need
not be as tight as illustrated) to avoid any traps in
the lines.

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

CAUTION

The couplings on the sets of precharged lines are
self sealing when installed properly. Carefully
follow the instructions:

REMOTE CONDENSER

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.

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

LOCATE REMOTE

CONDENSER ABOVE

ICEMAKER

January 2000

Page 6

NME654R & FME804R

FOR THE INSTALLER: Coupling 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.

3. Position the fittings on the correct connections
on the condenser and ice machine.

It is CRITICAL that ONLY the NUT on the
pre-charged tube be turned or the diaphragms will
be torn loose by the piercing knives and be loose
in the refrigeration system causing severe
operational problems.

Note: As the coupling is tightened, the diaphragms
in the quick connect couplings will begin to be
pierced. As that happens, there will be increased

Clean and Lubricate Couplings

The ½ inch discharge line (schrader valve end)

·

goes to the remote condenser fitting marked
“discharge line.”

3

·

The

inch liquid line (schrader valve end) goes

8

to the remote condenser fitting marked “liquid
line.”

·

The ½ inch discharge line goes to the ice
maker fitting marked “discharge line.”

3

·

The

inch liquid line goes to the ice maker

8

fitting marked “liquid line.”

Final Connections:

4a. Begin by tightening the couplings together by
hand. Continue to turn the swivel nuts by hand until
is is certain that the threads are properly engaged.

4b. Using two wrenches, one to rotate the swivel
nut and one to hold the tubing, tighten each
coupling.

SCHRADER

NO SCHRADER

Tighten Swivel Nut

resistance to tightening the swivel nut.
4c. Continue tightening the swivel nut until it

bottoms out or a very definite increase in
resistance is felt (no threads should be showing).
Do NOT overtighten.

5. 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

Rotate Swivel Nut ¼ Turn More

nut turns, the line will show when 1/4 turn is made.

6. After all connections are made, and after the
king valve has been opened (do not open at this
time), check the couplings for leaks.

TO REMOTE

TO ICEMAKER

January 2000

Page 7

NME654R & FME804R

FOR THE INSTALLER: Location

TYPICAL INSTALLATION

EXCESS

PRECHARGED

TUBING INSIDE

BUILDING

REMOTE

CONDENSER

CUTAWAY

Ice Machine

ROOF

SERVICE

ACCESS

SERVICE ACCESS

SIDE AND BACK

WALL

CUTAWAY

January 2000

Page 8

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

NME654R & FME804R

Water Inlet

FIELD SUPPLIED

WATER FILTER

HAND SHUT

OFF VALVE

CONNECT TO
COLD WATER

WATER INLET

3/8" MALE

VENT ICE
MACHINE

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

There is one ¾ " FPT drain at the
back of the cabinet, the drain line is of
the gravity type, and ¼ 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 ¾ " rigid tubing.

Storage Bin: Install a separate
gravity type drain. Insulation of this
drain line is recommended.

VENT BIN DRAIN

3/4" FPT

FLOOR DRAIN

January 2000

Page 9

NME654R & FME804R

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

Connect the electrical power to the unit to the wires
in 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.

Connect the ice machine to its own electrical circuit
so it is individually fused. Voltage variation must
remain within design limitations, even under
starting conditions.

TERMINAL STRIP

FOR REMOTE

CONDENSER

ICE MACHINE

JUNCTION BOX

There is a separate junction box for the remote
condenser fan motor.

Install an interconnecting wire between the remote
condenser and the junction box at the back of the
ice machine.

The remote condenser must be wired to the ice
machine 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.

GROUND

THE

CHASSIS

POWER

SUPPLY

RAIN PROOF

CONDUIT

January 2000

Page 10

NME654R & FME804R

FOR THE INSTALLER: Completed Installation

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

ROOF

CUT-AWAY

INSULATED
PRECHARGED
REFRIGERANT

TUBING

January 2000

Page 11

NME654R & FME804R

FOR THE INSTALLER: Final Check List

1. Is the ice system installed
indoors in a location where the air
and water temperatures are
controlled, and where they do not
exceed the design limitations?

2. Is there an electrical service
disconnect within sight of the
installed machine? Has the
voltage been checked, and
compared to nameplate
requirements?

3. Have all the plumbing
connections been made and
checked for leaks?

4. Has the machine and bin been
leveled?

5. Is there a minimum of 6"
clearance at the rear, left, and
right of the machine for proper
service access and air
circulation?

6. Is the water pressure a
minimum of 20 PSI?

7. Has the machine been secured
to the bin?

8. If two units on one condenser,
has the relay kit been installed?

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

10. Is the remote condenser
installed per local building codes,
and in a place where it has
adequate ventilation and minimal
solar heat gain?

11. Has all shipping material and
literature (inside the front panel)
been removed from the units?

12. Have the remote condenser
and precharged lines been
properly installed?

13. Has the electrical connection
between the icemaker and the
condenser been made?

14. Verify that the master switch
is in the OFF position.

15. Switch on the electrical power.

16. Refer to Pre-Start instructions, the next page.

REMOTE

CONDENSER

SECURED?

PLUMBING?

ROOF

HOLES

SEALED?

POWER

SUPPLY?

LEVELED?

January 2000

Page 12

INITIAL START UP

Pre-Start Inspection

1. Remove the front, left, and right side service
panels.

2. Check that any styrofoam shipping blocks have
been removed.

3. 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
turns freely (remote condenser).

Start Up

1. Go through the pre-start inspection.

2. Open the 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.

NME654R & FME804R

4. Check that the refrigerant lines are properly
installed.

5. Check that the electrical power has been on for
at least 4 hours.

6. Check that the unit is installed correctly
according to the final check list on page 11.

6. The unit should soon be making ice, if desired
the low side pressure can be checked, it should be
30 PSIG + or - 4 PSIG. The discharge pressure will
depend upon air and water temperatures, but
should be between 180 PSIG and 300 PSIG.

3. Open the King Valve.

4. Turn the master switch on.
The electrical start up sequence is automatic.
A. There should be a short (15 second) delay

before the gearmotor starts.
B. After the gearmotor starts, the liquid line valve

will open, the low pressure control will close and
the compressor will start.

5. The remote condenser fan turns, and the
condenser begins to discharge warm air.

7. THERE ARE NO ADJUSTMENTS TO MAKE,
so replace the panels.

8. Clean and/or sanitize the storage bin interior,
wipe off the exterior with a clean, damp cloth.

9 Give the owner/user the service manual, instruct
him/her in the operation of the unit, and make sure
they know who to call for service.

10. Fill out the manufacturers registration and mail
it to Scotsman.

January 2000

Page 13

NME654R & FME804R

COMPONENT DESCRIPTION

Control Box: Contains the electrical controls that
operate the machine.

High Pressure Cut Out: An automatic reset
switch sensing the high side refrigeration pressure.
It is set to shut the machine off at 450 PSIG.

Pump Down Control: An automatic reset
pressure switch connected to the low side of the
refrigeration system. Controls the compressor.

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.

CONTROL BOX

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 Discharge Chute: Directs the ice produced by
the evaporator into the storage bin.

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.

Gear Motor: An oil filled, speed reduction
gearbox, driving the auger.

Cleaning Drain Tube: When uncapped and
lowered, drains the evaporator.

Compressor: The refrigerant vapor pump.
Expansion valve: The refrigerant metering

device.

HIGH PRESSURE

CUT OUT

COMPRESSOR

EXPANSION VALVE

ICE CHUTE

WATER LEVEL

SENSOR

RESERVOIR

CLEANING

DRAIN TUBE

EVAPORATOR

GEAR MOTOR

ICE LEVEL

SENSOR

January 2000

Page 14

NME654R & FME804R

COMPONENT DESCRIPTION: Control Box

Contactor: A definite purpose contactor
connecting the compressor and the remote
condenser fan motor to the power supply.

Circuit Board: The circuit board receives input
signals from several sensors and translates them
to control the electrical power to the various loads.

The sensors include:

Photo-electric eyes for bin level

·

Conductivity probe for water level in the

·

reservoir

Water OK Light

Control Board

Current meter to measure the amp draw of the

·

auger drive motor

The loads include:

Liquid line coil

·

Auger drive motor

·

Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the machine.

Power Light

Service Light

Freeze Light

Bin Full

Light

LED1

Compressor

Relay

LED3

Auger

Relay

January 2000

Page 15

NME654R & FME804R

ELECTRICAL SEQUENCE

There are 7 indicator lights on the control board:

WTR-OK (Water OK). Green. Normal =

·

Glowing. Glows when there is water in the
reservoir.

PWR-OK (Power OK). Green. Normal =

·

Glowing. Glows when the control board has
power and is functional.

Service. Red. Normally Off.

·

Freeze. Red. Normally glowing when making

·

ice.

Bin Full. Red. Normally Off when making ice.

·

LED1. White. Located next to the board’s

·

Compressor Relay. Normally Glowing when
making ice.

LED3. White. Located next to the board’s Auger

·

Motor Relay. Normally Glowing when making

ice.
If the machine is switched off at the mode switch,
but is otherwise ready to go, switching the mode
switch to ON does the following:

The PWR-OK light glows.

·

· If there is water in the reservoir the WTR-OK

light glows.

·

After 10 seconds the Freeze, LED1 and LED3

lights glow and the machine starts up.

Start Up:

·

The compressor relay and auger motor relay

become energized, connecting power to the

windings of the auger motor and liquid line valve

coil.

·

The liquid line valve opens, refrigerant flows to

the expansion valve.

·

The pump down pressure switch closes

connecting power to the contactor coil

·

The contactor is energized, connecting power to

the compressor, and the compressor starts.

·

As ice is made it passes between the ice level

sensors but because it is not a continuous

stream it only interupts the sensor’s infrared

beam momentarily. The bin full light remains off

and the machine stays on until ice builds up in

the bin and blocks the path between the

sensors for 6 seconds or longer. When that

occurs the bin full light glows and the machine

shuts down.

Shut Down:

The compressor relay opens, LED1 goes out.

·

The liquid line valve closes, stopping refrigerant

·

flow.

The pump down control opens after the suction

·

pressure falls to its cut out point.

The compressor contactor opens

·

The compressor stops

·

The auger motor stays on for 1 more minute,

·

clearing out ice in the evaporator, and then

The auger motor relay opens, LED3 goes out

·

and the auger motor stops.
The liquid line valve will not reopen until 2 minutes
or more have passed after the last shut down.

If the path between the ice level sensors remains
clear for more than 10 seconds the ice machine
will restart.

Control Board Protection Devices

When the water level in the reservoir falls

·

below the water level sensor’s tip, the WTR-OK

light goes out and the machine shuts down.

When water refills the reservoir the WTR-OK

light glows and the machine starts up again.

·

If the auger drive motor current becomes

excessive the liquid line valve and auger drive

motor will be switched Off and the Service light

will blink. The control board will restart the auger

drive motor in 4 minutes. If during the first 60

seconds after restart the auger motor current

stays within limits, the liquid line valve is

reopened and the machine returns to normal

operation. If the auger motor’s current is

excessive within 60 seconds after the restart,

the process will be repeated once more. If

during that try the current is still excessive the

machine shuts down and must be manually

reset. The service light will then be glowing

continuously.

To Reset: Disconnect and reconnect power to
the ice machine.

Other Protection Devices:

·

If the high pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the pressure falls

below its cut in point.
The mode (on - off) switch is the manual control
for the complete machine, but it is not a service
disconnect.e, but it is not a service disconnect.

January 2000

Page 16

OPERATION: Water

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, goes to the water
reservoir which it enters through the float valve.
The water them goes out the bottom of the
reservoir tank to the bottom of the evaporator.

Reservoir overflow or evaporator condensation is
routed to the drain.

NME654R & FME804R

Water Level: The correct water level should be

checked when the machine is making ice. Locate the

water level in the reservoir and compare it to the

horizontal line molded into the side of the reservoir.

The correct level should be between

below the line. If needed, bend the float arm up or

down to adjust the water level.

1

" above and

8

1

"

4

WATER

INLET

RESERVOIR

DRAIN TUBE

WATER LEVEL

DRAIN

January 2000

Page 17

NME654R & FME804R

OPERATION: Refrigeration

Beginning at the compressor, the refrigerant is
compressed into a high temperature gas. The
discharge line directs this gas to the condenser. At
the remote condenser the gas is cooled by air and
condenses into a liquid. This high pressure liquid
then goes through the liquid line to the head
pressure control valve, into the receiver, through
the liquid line valve and then through the
expansion valve.

Refrigeration Schematic

The thermostatic expansion valve meters liquid
refrigerant into the evaporator, the volume of liquid
refrigerant depending upon the temperature of the
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less. At the
evaporator, the refrigerant enters an area of
relatively low pressure, where it can easily “boil off”
or evaporate. As it evaporates, it absorbs heat
from the evaporator and whatever is in contact with
it (such as the water inside it). After the
evaporator, the refrigerant, now a low pressure
vapor, goes through the suction line back to
compressor, where the cycle is repeated.

REMOTE CONDENSER

DISCHARGE

LINE

HEAD

PRESSURE

CONTROL

VALVE

LIQUID LINE

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

LIQUID LINE

VALVE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

KING

VALVE

RECEIVER

January 2000

SUCTION

LINE

COMPRESSOR

Page 18

OPERATION: Refrigeration

Low Condensing Temperature

NME654R & FME804R

The refrigeration system under low condenser air
temperatures is much the same as it is under
higher temperatures, with the exception that the
resulting low head pressures cause the head
pressure control to close off the liquid line between
the condenser and the receiver.

DISCHARGE

LINE

LIQUID LINE

This forces more refrigerant into the condenser
(with a small amount of discharge gas going into
the receiver to maintain pressure until the head
pressure is built back up to the rated gauge
pressure of 180 PSIG). At that pressure the valve
opens up the liquid line from the condenser to the
receiver.

Refrigeration Schematic

REMOTE CONDENSER

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

HEAD

PRESSURE

CONTROL

VALVE

KING

VALVE

RECEIVER

LIQUID LINE

VALVE

COMPRESSOR

January 2000

Page 19

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

SUCTION

LINE

NME654R & FME804R

OPERATION: Refrigeration

PUMP DOWN

During the pump down cycle (usually initiated by
the circuit board de-energizing the liquid line valve)
the discharge gases flow through their normal path
to the remote condenser, through the head
pressure control, and into the receiver.

DISCHARGE

LINE

LIQUID LINE

At this point the refrigerant flow is stopped by the
closed liquid line valve. This action forces the
refrigerant into the receiver and keeps it out of the
compressor. The pump down continues until the
low pressure control turns the compressor off.

Refrigeration Schematic

REMOTE CONDENSER

HEAD

PRESSURE

CONTROL

VALVE

KING

VALVE

RECEIVER

LIQUID LINE

VALVE

COMPRESSOR

January 2000

Page 20

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

SUCTION

LINE

NME654R & FME804R

CLEANING & SANITIZING

A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In
order to receive the best return for that investment, it MUST receive periodic maintenance.

It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and
less costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and by
replacing worn parts before they can cause failure. The following is a list of recommended maintenance
that will help keep the machine running with a minimum of problems.

Maintenance and Cleaning should be scheduled at a minimum of twice per year.

Note: Electrical power will be ON when doing in place cleaning.

ICE MAKING SYSTEM: In place cleaning

1. Check and clean any water treatment devices, if
any are installed.

2. Remove screws and the front and top panels.

3. Move the ON-OFF switch to OFF.

4. Remove all the ice from the storage bin.

5. Remove the cover to the water reservoir and
block the float up.

6. Drain the water reservoir and freezer assembly
using the drain tube attached to the freezer water
inlet. Return the drain tube to its normal upright
position and replace the end cap.

7. Prepare the cleaning solution: Mix eight ounces
of Scotsman Ice Machine Cleaner with three quarts
of hot water. The solution should be between 90
and 115 degrees F.

Scotsman Ice Machine
Cleaner contains acids.
These compounds may
cause burns.

If swallowed, DO NOT
induce vomiting. Give
large amounts of water or
milk. Call Physician
immediately. In case of
external contact, flush
with water.
KEEP OUT OF THE
REACH OF CHILDREN.

11. Repeat step 6 to drain the reservoir. Wash and
rinse the water reservoir.

Sanitizing:
To sanitize, use an approved sanitizing solution or

mix one ounce of household bleach with 2 gallons
of warm (95
steps 8-11 using the sanitizer solution in place of
the cleaning solution.

12. Remove the block from the float in the water
reservoir.

13. Switch the master switch to ON

14. Continue ice making for at least 15 minutes, to
flush out any cleaning solution.

DO NOT USE any ice produced from the
cleaning solution.

Be sure no ice remains in the bin.

15. Remove all ice from the storage bin.

16. Add warm water to the ice storage bin and
thoroughly wash and rinse all surfaces within the
bin.

17. Sanitize the bin interior with an approved
sanitizer using the directions for that sanitizer.

18. Replace the panels.

o<D>

F. to 115

o<D>

F.) water. Repeat

8. Slowly pour the cleaning solution into the water
reservoir until it is full. Wait 15 minutes, then
switch the master switch to ON.

9. As the ice maker begins to use water from the
reservoir, continue to add more cleaning solution to
maintain a full reservoir.

10. After all of the cleaning solution has been
added to the reservoir, and the reservoir is nearly
empty, switch the master switch to OFF.

January 2000

Page 21

NME654R & FME804R

SENSOR MAINTENANCE

1. The bin control uses devices that sense light,
therefore they must be kept clean enough so that
they can “see”. At least twice a year, remove the
bin control sensors from the base of the ice chute,
and wipe the inside clean, as illustrated.

ICE CHUTE

ICE LEVEL

SENSORS

SLIDE LEFT TO

REMOVE

2. The ice machine senses water level by a probe
located in the water reservoir. At least twice a
year, the probe should be removed from the
reservoir, and the tip wiped clean of mineral
build-up.

Clean the Probe's Tip with ice
machine cleaner and a clean,
soft cloth.

January 2000

Page 22

BEARING MAINTENANCE

NME654R & FME804R

The bearing in the breaker should also be checked
at least two times per year.

Chute Cover

A. Check the bearing by:

Ice Sweep

removing the water shed & unscrewing the

·

Auger Stud

Cap Screw

breaker cover (left hand threads).

unscrewing the auger stud

·

Inspect the bearing. There should be plenty of
grease in sight. If grease is needed the bearing
and breaker should be removed to check the
action of the bearing. It should rotate smoothly.

To remove the breaker remove the lower ice chute
then take out all four allen head cap screws and
pull the breaker off the auger and evaporator.

If the bearing only needs grease, inject grease into
the bearing using Scotsman grease needle pn
02-3559-01 and Scotsman bearing grease
cartridge, pn A36808-001. Be sure to inject grease
evenly and thoroughly.

·

removing the ice chute cover

Off

·

unscrewing the ice sweep

Breaker

Cover

January 2000

Bearing

See Removal and Replacement section to replace
bearing or seals.

Reverse to reassemble.

Page 23

Needle, pn
02-3559-01

NME654R & FME804R

AUGER AND OTHER MAINTENANCE

In some areas the water supply to the icemaker will
have a great deal of minerals in it, and that will
result in an evaporator and auger becoming
coated with these minerals, requiring a more
frequent removal than twice per year. If in doubt
about the condition of the evaporator and auger,
the auger can be removed so the parts can be
inspected.

Note: Water filters can filter out suspended solids,
but not dissolved solids. “Soft” water may not be
the complete answer. Check with a water
treatment specialist regarding water treatment

For more information on removal and
replacement of these parts, see REMOVAL AND
REPLACEMENT.

1. To remove the auger, remove the front and top
panels.

2. Move bail clamp holding ice chute cover to ice
chute, and remove cover.

3. Unscrew and remove ice sweep.

4. Remove ice chute from evaporator.

5. Remove 4 allen screws holding breaker to
evaporator.

6. Pull up to remove auger.

After the auger has been removed, allow the auger
to dry; if the auger is not bright and shiny, it must
be cleaned.

ICE

SWEEP

BREAKER

COVER

Clean the auger and evaporator as required.
DO NOT HONE THE EVAPORATOR.

7. Replace the water seal.

8. Reverse to reassemble.

4. Clean the remote condenser. Use a vacuum
cleaner or coil cleaner if needed.

Do NOT use a wire brush.

5. Check and tighten all bolts and screws.

January 2000

Page 24

NME654R & FME804R

OPERATING CHARACTERISTICS

Typical Low Side Pressure

28 - 32 PSIG

·

Typical Discharge Side Pressure

240 PSIG, will vary between 180 and 380 depending upon air and water temperatures

·

Refrigerant Charge

208 ounces of R-404A

·

Typical Compressor Amp Draw

8-9

·

Typical Gearmotor Amp Draw

3.5 to 3.8

·

High Pressure Cut Out

450 PSIG

·

Pump Down Pressure Switch

Opens at 15 PSIG

·

·

Closes at 30 PSIG

Compressor

·

RS58C1E-PAA-213

Bin Control

·

Electric Eye at base of ice chute.

Water Safety

·

Thermistor in reservoir

January 2000

Page 25

NME654R & FME804R

SERVICE DIAGNOSIS:

Symptom Possible Cause Probable Correction

No ice is made, nothing operates Unit off due to no power. Restore power

Unit off due to master switch in Off
position

Unit off due to low water level in
reservoir

Unit off due to ice level sensors
(photo-electric eyes) blocked

Unit off due to scale on water level
sensor

Unit off due to high pressure control
open

Auger motor hums but does not turn Auger can’t turn. Circuit board has not

Unit is shut down Circuit board has shut ice machine

Pump down pressure control open,
very low suction pressure

Move master switch to ON

Check water supply, filter and float
valve.

Check/clean ice level sensors

Clean water level sensor

Check for remote condenser fan
motor failure or power interuption to
the fan motor

yet shut unit down.

down due to high auger motor amp
draw. Check for cause of high amp
draw, including bearings, gear motor
condition and scale on auger &
evaporator.

Auger not turning due to: motor
failure; auger relay failure on circuit
board; or gears stripped. Check drive
train.

Liquid line valve not opening due to
coil failure or failure of compressor
relay on circuit board

TXV restricted or not metering. Check
bulb temperature.

Lack of refrigerant. Check for a leak.

No power to circuit board Check harness

Hi or Low pressure switch open

Circuit board gear motor relay will not
close

Water level or ice level sensor failed Check / replace sensor

Check / replace board

January 2000

Page 26

NME654R & FME804R

SERVICE DIAGNOSIS:

No ice, auger motor is turning Compressor contactor coil is open Check / replace contactor

Compressor will not start Check start capacitor

Check start relay

Check compressor windings

Circuit board relay will not close Check / replace board

Pump down pressure switch contacts
do not close, liquid line valve open
and suction pressure high

Symptom Possible Cause Probable Correction

Unit makes ice, but very slowly High discharge pressure because of a

dirty condenser coil

Auger and evaporator are coated with
mineral scale

Low refrigerant charge Locate leak. Recover refrigerant,

Water leak Ice storage bin drain restricted Clean out drain

Tubing cracked Replace tubing

Condensation on drain tubing Insulate tubing

Hose off Re-attach hose

Reservoir cover off Return cover to reservoir

Reservoir cracked Replace reservoir

Check pump down switch contacts

Clean the condenser

Clean the water system

repair leak, replace dryer, evacuate
and weigh in the nameplate charge.

Excessive ice meltage Bin drain clogged Clean out bin drain

Machine makes too much noise Evaporator coated internally with

Evaporator water seal leaks Check base of evaporator & drip pan.

If the seal leaks, shut off the water,
remove the auger, replace the water
seal. Check gear motor for water
infiltration.

Poor fit between bin door and door
frame

minerals

Motor bearings dry Oil or replace motor

January 2000

Page 27

Adjust or replace

Clean with Scotsman Ice Machine
Cleaner

NME654R & FME804R

CONTROL SYSTEM DIAGNOSTICS

The control system consists of:

Control Board

·

Water Sensor

·

Ice Sensors

·

High Pressure Cut Out

·

Low Pressure Cut Out

·

If the unit is OFF, check the control board:

1. Is the Power OK light on? If not check power to
the unit. If it has power, and the Power OK light is
NOT on, check the high pressure and low pressure
cut outs. If they are both closed, replace the board.
If the Power OK light is ON, go to the next step.

2. Is the Water OK light on? If it is, go to the next
step. If not, check the water level in the reservoir. If
there is water in the reservoir, check that the water
sensor is plugged in. To check the water sensor:

A. Unplug water sensor.
B. Pull water sensor from reservoir.
C. Place one ohmmeter lead on the sensor's plug

and the other on the sensor's tip. The meter should
show nearly zero resistance. If it reads infinite
resistance, check the tip for corrosion. If it is clean
and still reads open, replace the sensor.

OR connect a copper wire to the wire where the
water sensor plugs into and place the other end in
the water. The water OK light should go ON. If it
does not, replace the control board.

3. Ice sensor check. Is the Bin Full light Off? If it is
OFF and the Service light is Off, and the unit is not
running, replace the control board.

If it is OFF and the auger motor is running but the
compressor is not, check the compressor contactor
coil.

If it is on, the ice sensors may be blocked. Remove
them and check for mineral scale. Scotsman's test
box can also be used to determine if the ice
sensors or board are defective.

Using the tester:
A. Disconnect the ice sensors at the connection by

the ice chute. Connect the LED and PHOTO
TRANS wires to the control board's wires.

B. With the On - Off (mode) switch in either
position, move the Bin Full switch on the tester to
Bin Full - the tester's light will blink and after a few
seconds the bin full light on the control board will
come on. If not, replace the board.

Move the Bin switch on the tester to Bin Empty.
The light on the tester will go out, and after a few
seconds the Bin Full light on the board will go out.
If master switch is ON, the unit should start.

4. High pressure cut out check.
Disconnect electrical power.
Pull the wires off the high pressure cut out.
Use an ohmmeter to determine if the switch is

OPEN, If it is, check the discharge pressure. If the
discharge pressure is less than 300 PSIG, replace
the high pressure cut out.

If the high pressure cut out is open and the system
has high discharge pressure, check for the cause.

5. Low pressure cut out check.
Disconnect electrical power.
Pull the wires off the low pressure cut out.
Use an ohmmeter to determine if the switch is

OPEN, If it is, check the suction pressure. If the
suction pressure is greater than 20 PSIG, replace
the low pressure cut out.

If the low pressure cut out is open and the system
has low suction pressure, check for the cause.

January 2000

Page 28

NME654R & FME804R

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off the water supply to the icemaker.

2. Remove front panel and reservoir cover.

3. To remove float only, disconnect water inlet
compression fitting at reservoir inlet, push in on
locking tab, pull float up and out of the reservoir.

Note: there is a separate plunger/seat inside the
valve assembly that may be replaced.

4. To remove reservoir, disconnect water outlet at
reservoir base.

5. Remove drain hose from reservoir.

6. Remove water level sensor from reservoir.

7. Remove mounting screws from reservoir
bracket, and remove reservoir from icemaker.

8. Reverse to reassemble.

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

4. Locate ice chute, at the base of the chute, in
front of and behind it are two plastic bin control
mounts.

5. Slide each bin control to the left, and in the
control box, disconnect the electrical leads
connecting the bin control to the circuit board.

6. Reverse to reassemble, be certain that the bin
controls are aligned so that the ice level sensors
are visible (centered) through the holes in the ice
chute.

ICE

CHUTE

SLIDE BIN

CONTROLS IN

AND OUT

Float

Assembly

Locking

Tabs

Water

Sensor

January 2000

Page 29

NME654R & FME804R

REMOVAL AND REPLACEMENT: Bearing And Breaker

Note: Removal of the auger, water seal, evaporator
and gearmotor must begin at the top of the
assembly.

To Remove the Breaker Bearing Assembly:

Moving Parts Hazard.

Moving parts can cause
personal injury.
Disconnect electrical
power before beginning.

1. Remove panels and disconnect electrical power.

2. Push bail clamp back and remove ice chute
cover.

3. Unscrew and remove ice sweep.

4. Lift up and remove ice chute.

5. The breaker may be removed from the auger
and evaporator without disturbing the auger.

a. Unscrew breaker cover from breaker (left hand

threads)

b. Unscrew auger stud from top of auger.

c. Unscrew 4 allen head cap screws holding

breaker to evaporator.

d. Lift up, and remove breaker/bearing assembly

from auger & evaporator.

6. Service the bearing. Check for rust, rough spots
and damage.

a. The bearing is pressed into the breaker, to
remove the bearing and replace it an arbor press is
needed.

b. Replace lower seals before installing new
bearing in breaker.

Note: seals must be pressed in with a tool pushing
against the outer edge only, they will not install by
hand.

Replace parts as required. Re-grease bearing with
Scotsman part no. A36808-001 bearing grease.
Replace top seal, and check the o-rings, replace if
cut or torn.

7. Reverse to reassemble: specific tools and
materials are required to install properly.

a. Add food grade grease such as Scotsman part
number 19-0569-01 to the seal area before
installing on the auger.

b. Check the seal to shaft areas for cuts, or rough
spots: none are permitted.

Step 5-a Step 5-b Step 5-c and Step 6

ICE

SWEEP

AUGER

STUD

BREAKER

ALLEN

SCREWS

January 2000

Page 30

REMOVAL AND REPLACEMENT: Auger

NME654R & FME804R

To Remove the Auger:

Turn off the water to the machine, and unclip the
evaporator drain hose, pull it down and drain the
evaporator into the bin or a container.

1. Remove the top panel.

2. Remove the auger and breaker/bearing as an
assembly.

a. Unscrew 4 allen head cap screws holding

breaker to evaporator.

b. Lift up on breaker and remove auger from

evaporator.

Note: If the auger is stuck, the breaker must be
removed from the auger.

The breaker may be removed from the auger and
evaporator without disturbing the auger.

a. Unscrew breaker cover from breaker (left hand

threads)

b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding

breaker to evaporator.

d. Lift up on breaker to remove from auger.

If the auger is stuck:

Use a slide hammer type puller to pull on the auger
at the threaded hole. The size of that hole is
5/8"-18.

Inspect the auger, the critical areas of the auger
are:

a. The auger body. It should be clean and
shining. Sometimes an auger will appear clean
when wet, but after it is dry it will be seen to be
stained. Scrub the auger with ice machine cleaner
and hot water.

WARNING

Ice machine cleaner is an acid. Handle it with
extreme care, keep out of the reach of children.

b. The water seal area. Because the auger has
been removed, the water seal will have to be
replaced. Remove the water seal top half from the
auger, and inspect the auger for minerals clean as
required.

BREAKER - BEARING

ASSEMBLY

STOP

SLIDE HAMMER PULLER

REMOVING AUGER

THREAD

INTO

AUGER

DRIVE SLIDE UP

AGAINST STOP TO

LOOSEN AUGER

January 2000

Page 31

NME654R & FME804R

REMOVAL AND REPLACEMENT: Water Seal

To Remove the Water Seal:

(Assuming all steps to remove the auger have
been performed.)

1. The gearmotor/evaporator assembly will have to
be pulled away from the machine (if not yet done).

2. Remove the 4 hex head cap screws holding the
evaporator to the gearmotor assembly. Lift the
evaporator up and off of the gearmotor.

3. Remove the snap ring or wire retainer from the
grove under the water seal.

4. Pull or drive out the lower half of the water seal.

To Replace the Water Seal:

1. Lubricate the water seal with water, and push
the water seal into the bottom of the evaporator
slightly past the grove for the snap ring.

2. Replace the snap ring and pull the water seal
down against it.

3. The part of the water seal that rotates with the
auger must also be replaced. Remove the old part
from the auger and clean the mounting area.

4. Place a small bead of food grade silastic sealant
(such as 732 RTV or Scotsman part number
19-0529-01) on the area of the auger where the
water seal is to be mounted.

5. Carefully push the water seal (rubber side
against the auger shoulder and the silastic.)

CAUTION

Do not get any silastic onto the face of the seal.

REMOVAL OF THE

WATER SEAL

6. Allow the auger and seal to air dry until the

silastic is dry on the surface.

7. If the original water seal was leaking, it would be
a good idea to inspect the interior of the gearmotor.

WATER SEAL

RETAINING

RING

January 2000

Page 32

NME654R & FME804R

REMOVAL AND REPLACEMENT: Evaporator

To Replace the Evaporator:

(Assuming all the steps for removal of the thrust
bearing, breaker, auger, and water seal have been
performed.)

1. Discharge and recover the refrigerant from the
ice maker.

2. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.

CAUTION

Heat sink the TXV body when unsweating or
resweating the adjacent tubing.

b) At the suction line at the joint about 3" from the

evaporator.

3. Remove the evaporator.

4. Unsweat the drier from the liquid line.

5. After installing a new water seal in the new

evaporator ( see “To Replace the Water Seal”)
resweat the tubing connections.

6. Install an new drier in the liquid line.

7. Evacuate the system until dehydrated, then

weigh in the nameplate charge. Check for leaks.

8. Install auger, breaker, breaker bearing

assembly, and ice discharge chute in reverse order
of disassembly. See “To Reassemble Evaporator
and Auger”

To Reassemble the Evaporator and Auger

1. After the gearmotor has been inspected, fasten

the evaporator to the gear motor, be sure that the
number of shims indicated on the gear case cover
is in place between the gearcase cover and the
drip pan gasket. Torque the bolts to 110 inch
pounds.

2. Lower the auger into the evaporator barrel,

slightly turning it to match up with the drive end. Do
Not Drop Into the Evaporator.

3. Complete the reassembly by reversing the

disassembly for the breaker & thrust bearing
assembly.

Head Pressure Control Valve

1. Recover system of refrigerant

2. Break off process tube on the top of the OLD
head pressure control valve.

3. Unsweat old valve from tubing.

4. Unsweat old dryer from tubing.

5. Install new valve in place, check for correct
connections and be sure the number on the side of
the valve is “180"

6. Wrap the new valve body in wet cloths to heat
sink the valve body.

7. Sweat in the new valve and the new dryer.

8. Evacuate the system, and weigh the nameplate
charge into the receiver.

PLACE A BEAD OF
FOOD GRADE
SEALANT HERE

January 2000

Page 33

NME654R & FME804R

REMOVAL AND REPLACEMENT: Gearmotor Assembly

DRIVE MOTOR

WATER SHED

OUTPUT GEAR,

OUTPUT SHAFT,

AND BEARINGS

BEARING

To Remove and Repair the Gearmotor
Assembly:

(Assuming that the procedures through removal of
the water seal have been performed.)

1. Remove the electrical wires from the gear drive

motor.

2. Unscrew the 4 cap screws holding the

gearmotor to the gearmotor plate.

3. Remove the gearmotor from the icemaker.

To Inspect the Gearmotor.

A) Remove the cap screws holding the gearmotor

case halves together and pry the two cases apart.

B) To lift off the cover, lift up until you can feel

internal contact, then pull the cover towards the
output gear end, and then lift the cover (with drive
motor attached) up and away from the gear motor
case.

Note: The case cover output gear, bearings, and
shaft are one pressed together assembly. Replace
as a unit.

GASKET

GEARCASE

C) Inspect the oil, gears, and bearings. If the oil
level and condition is acceptable, quickly check the
gears and bearings. They are likely to be fine if the
oil is.

If there is evidence of water in the oil (rusty
bearings and gears; the oil having a creamy white
appearance; oil level too high) carefully inspect the
bearings and gears. If in doubt about the condition
of a part, replace it. The oil quantity is 14 fluid
ounces, do not overfill.

Note: The gears and bearings are available only as
pressed together sets.

D) After replacing parts as required, (if any)
reassemble the gearcase. The two smaller gears
and the oil should be in the lower case, the output
gear will be with the cover. As the cover is lowered
onto the lower case, the cover will have to be
moved closer to the second gear after the output
gear has cleared the second gear top bearing.

E) After the case is together, and the locating pins
are secure in both ends, replace all cap screws.

4. Bench test the gearmotor, check for oil leaks,
noise, and amp draw.

January 2000

Page 34

REFRIGERATION SERVICE

NME654R & FME804R

General Information:

Work on the refrigeration system should only be
done when it is certain that the system needs
repair.

Refrain from checking refrigeration

·

pressures without reason. Visual inspection
of the water system, observation of the ice
formation, amp draw, voltage, and other
techniques will lead to proper diagnosis.
Scotsman also recommends that, at the time of
initial start up, gauges not be used.

If gauges must be used, don’t always check the

·

high side pressure. If the condenser is clean
and seems to be operating correctly, it most
likely is. The low side pressure is more
important on an ice machine than the high side.

If gauges must be used, use very short hoses to

·

minimize refrigerant discharged into the air.

Refrigerant should not be added except as a

·

way to determine the proper operation of the
product. If the system was low on refrigerant,
there is a leak, and it must be found and
repaired.

Anytime the refrigeration system has been

·

opened, the dryer should be replaced. Note:
Only a HFC type dryer should be used.

When brazing the tubing connections to

·

components such as the TXV, the component
must be protected by heat sink material.

When brazing a nitrogen purge is required.

·

Evacuate to 300 microns.

·

Recover, reclaim or recycle refrigerant.
Access Valves: To use the access valves:

Remove the cap from the stem, use a 3/16" allen
wrench to check that the valve is CLOSED. The

Allen

Wrench

Torque Stem to

Torque Stem Cap

to 8-12 ft. lb.

Torque Core

Cap to 7-12

ft. lb.

·

This system has a critical charge, it must be
recharged with the correct amount of refrigerant
as listed on the nameplate of the ice machine,
or performance will suffer.

Charging Procedures

Extra care must be taken when recharging this
remote system. No liquid refrigerant may be placed
in the system at the compressor.

RECEIVER

remove the core cap.

DO NOT use the valves at the front of the unit for

weighing in the charge. All liquid HP62 must be

weighed into the receiver through the “front seated”

king valve".

FRONT SEATED

KING VALVE

SERVICE PORT

Access Valves

Note: There are no valve

cores in this valve.

CHARGING

CYLINDER or

SCALE

January 2000

Page 35