INTRODUCTION
NME954R & FME1204R
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 ice machines covered in this manual are a
remote condenser type modular ice system that fits
a variety of Scotsman storage bins. They feature:
front service for the freezer, gear motor, control
box, water reservoir, and bin control; an electronic
circuit for monitoring ice and water level; a
thermostatic expansion valve; and R-404A as the
refrigerant.
Table of Contents
FOR THE INSTALLER ······································ Page 2
REMOTE CONDENSER SPECIFICATIONS ··························· Page 3
FOR THE INSTALLER ······································ 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 ELECTRICIAN: Fan Relay Kit ···························· Page 11
FOR THE INSTALLER: Completed Installation ·························· Page 12
FOR THE INSTALLER: Final Check List ····························· Page 13
START UP ············································ Page 14
COMPONENT DESCRIPTION ·································· Page 15
COMPONENT DESCRIPTION: Control Box ··························· Page 16
ELECTRICAL SEQUENCE: ··································· Page 17
OPERATION: Water ······································· Page 18
OPERATION: Refrigeration ···································· Page 19
OPERATION: Refrigeration ···································· Page 20
MAINTENANCE AND CLEANING ································ Page 21
Sensor Maintenance ······································· Page 22
Bearing Maintenance ······································· Page 23
Auger Maintenance ········································ Page 24
SERVICE DIAGNOSIS: No Ice ·································· Page 25
SERVICE DIAGNOSIS: Low Capacity ······························ Page 26
CONTROL SYSTEM DIAGNOSTICS ······························ Page 27
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls ··············· Page 28
REMOVAL AND REPLACEMENT: Bearing and Breaker ···················· Page 29
REMOVAL AND REPLACEMENT: Auger ···························· Page 30
REMOVAL AND REPLACEMENT: Water Seal ·························· Page 31
REMOVAL AND REPLACEMENT: Evaporator ·························· Page 32
REMOVAL AND REPLACEMENT: Gear Motor Assembly ···················· Page 33
Refrigeration Service ······································· Page 34
Parts Lists and Wiring Diagrams are located in the center of this manual.
January 2000
Page 1
This Manual Was Printed
On Recycled Paper
NME954R & FME1204R
FOR THE INSTALLER
Either the FME1204R or the NME954R is
designed to fit the following Scotsman storage
bins:
SB480 and extensions (with bin top KBT18)
·
BH800 using bin top KBT15 (one unit) or KBT25
·
(two units).
BH801 using bin top KBT28
·
BH900 with KBT24 (one unit)
·
BH900 with KBT25 (two units side by side)
·
Allow 6" above machine
for service.
NME954 Dispenser Applications
The NME954 can be placed on and used with
certain ice and ice-beverage dispensers. Kits are
required for proper operation:
Back View
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 IBD, use KDIL-N-L & Lancer kit.
·
Liquid Line Connection
Discharge Line Connection
Remote Condenser
Junction Box
Electrical Inlet
20.84"
2.96"
Drain
3/4" FPT
SPECIFICATIONS: ICE MAKER
Model Number Dimensions
(w/o bin)
H”xW”xD”
FME1204RS-32A 27 x 21 x 24 208-230/60/1 FLAKE Remote Air 14.1 20 208 ounces
FME1204RS-3A same 203-230/60/1 FLAKE Remote Air 11.2 15 208 ounces
NME954RS-32A same 208-230/60/1 NUGGET Remote Air 14.1 20 208 ounces
NME954RS-3A same 208-230/60/3 NUGGET Remote Air 11.2 15 208 ounces
Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.
Basic Electrical Ice Type Cond. Type Minimum
Water Inlet
3/8" Flare
5.25"
3"
Circuit
Ampacity
Maximum
Fuse Size
Refrigerant
Charge
(R-404A)
January 2005
Page 2
NME954R & FME1204R
REMOTE CONDENSER SPECIFICATIONS
Model Use with Basic Electrical
ERC151-32 1 FME1204R or 1 NME954R 208-230/60/1
ERC302-32 1 or 2 FME1204Rs or NME954Rs SAME
2.00
5.08
ERC DIMENSIONS
19.75
50.17
ABFG
3
33
"10
8
3
"16
4
3
"11
4
5
"
8
Liquid Line
.38 Quick Connect Fitting
.95
2.75
14.53
Air Discharge
Air Intake
Other Required Items:
RTE25 Precharged line set, 25’, R-404A or
Discharge Line
.50 Quick Connect Fitting
1.27
Adjustable Roof Clearance
12.00 18.00 24.00
30.48 45.72 60.95
2.07
23
19
13
"
16
7
"
8
.53
1.35
(6)
RTE40. Precharged line set, 40’, R-404A.
ICE MAKER NAMEPLATE
LOCATED ON BACK PANEL
SERIAL PLATE LOCATED
BEHIND FRONT PANEL
January 2000
Page 3
NME954R & FME1204R
FOR THE INSTALLER
Installation Limitations:
The machine and bin are designed to be installed
indoors, in a controlled environment:
Min Max
0
Air Temperature 50
(Not including the remote condenser)
Water Temperature 40
Water Pressure (PSI) 20 80
Voltage 198 253
(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.
F 1000F
0
1000F
Location
Install the machine 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.
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, instead 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 4
Remote Condenser Location
NME954R & FME1204R
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
hd
40.35"
Condenser Distance and
Location Schematic
January 2000
Page 5
NME954R & FME1204R
FOR THE INSTALLER: Remote Condenser
Location
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 for connecting information.
5. Have the roofing contractor seal the holes in the
roof per local codes.
Note: Precharged tubing contains a R-404A
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.
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.
Spiral
Excess
Tubing
Inside
Building
Remote Condenser
Above Ice Maker
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.
January 2000
Page 6
NME954R & FME1204R
FOR THE INSTALLER: Coupling Instructions
4b. Using two wrenches, one to rotate the swivel
Note: The couplings on the sets of precharged
lines must be installed properly to prevent leaking.
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.
3. Position the fittings on the correct connections
on the condenser and ice machine.
nut and one to hold the tubing, tighten each
coupling.
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.
Tighten Swivel Nut
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.
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
resistance to tightening the swivel nut.
4c. Continue tightening the swivel nut until it
bottoms out or a very definate 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
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.
Schrader
Valve
TO REMOTE
CONDENSER
No Schrader
Valve
Rotate Swivel Nut ¼ Turn More
TO ICE MAKER
January 2000
Page 7
NME954R & FME1204R
FOR THE INSTALLER: Location
EXCESS
PRECHARGED
TUBING INSIDE
BUILDING
TWO UNITS ON ONE CONDENSER
REMOTE
CONDENSER
ROOF
CUTAWAY
ICE MAKERS
SERVICE
ACCESS
SERVICE ACCESS
SIDE AND BACK
WALL
CUTAWAY
January 2000
Page 8
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
NME954R & FME1204R
Water Inlet
Field Supplied
Hand Shut
Off Valve
Water Filter
Connect To
Cold Water
Water Inlet
3/8" Male Flare
Vent Ice
Maker
Drain, 3/4"
FPT
Connect a cold potable water supply
to the ice machine. Use 3/8" O.D.
copper tubing and connect it 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 ¾" 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 ¾" rigid tubing.
Storage Bin: Install a separate
gravity drain to the ice storage bin.
Insulation of this drain line is
recommended.
Vent Bin Drain
3/4" FPT
Floor Drain
January 2000
Page 9
NME954R & FME1204R
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
Connect the electrical power to the ice machine
through the junction box at the back.
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
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.
Ground The
Chassis
Power
Supply
Rain Proof Conduit
January 2000
Page 10
FOR THE ELECTRICIAN: Fan Relay Kit
NME954R & FME1204R
WARNING
Do all wiring with the electrical power
disconnected.
To install the KCMR230 fan relay kit when using
(2) 230 VOLT ice makers and one 230 volt, two
circuit remote condenser (ERC302).
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.
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)
Possible Location
For KCMR230
Control Box
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.
January 2000
Page 11
NME954R & FME1204R
FOR THE INSTALLER: Completed Installation
A typical installation should generally appear as
illustrated below. The best place for the remote
condenser is above the ice machine, although
other locations are permisable.
Roof
Cut-Away
Insulated
Precharged
Refrigerant
Tubing
January 2000
Page 12
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?
Remote
Condenser
Secured?
Leveled?
NME954R & FME1204R
Roof Holes
Sealed?
Power
Supply?
6. Is the water pressure a
minimum of 20 psig?
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 ice maker and the
condenser been made?
Plumbing?
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.
January 2000
Page 13
NME954R & FME1204R
INITIAL START UP
Pre-Start Inspection
1. Remove the front, left, and right side service
panels.
2. Check that any 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).
4. Check that the refrigerant lines are properly
installed.
5. Check that the electrical power has been on for
at least 4 hours and that the compressor dome is
warm.
6. Check that the unit is installed correctly
according to the final check list on page 13.
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.
3. Open the King Valve.
4. Turn the master switch on.
The electrical start up sequence is automatic.
There will be a short (15 second) delay before the
gear motor starts and the liquid line valve opens.
After the liquid line valve opens the low pressure
control will close and the compressor will start.
6. The unit should soon be making ice, if desired
the low side pressure may be checked, it should be
32 psig + or - 2 psig. The discharge pressure will
depend upon air and water temperatures, but
should be between 200 psig and 280 psig.
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.
5. The remote condenser fan turns, and the
condenser begins to discharge warm air.
10. Fill out the warranty registration, and mail it to
the Scotsman Factory.
January 2000
Page 14
COMPONENT DESCRIPTION
NME954R & FME1204R
Control Box: Contains the electrical controls that
operate the machine.
High Pressure Cut Out: A manual reset switch
sensing the high side refrigeration pressure. It is
set to shut the machine off at 400 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.
Expansion valve: The refrigerant metering
device.
High Pressure
Cut Out
Pump Down
Pressure Switch
Compressor
Expansion Valve
Ice Chute
Water Level
Sensor
Reservoir
Cleaning Drain
Tube
Evaporator
Gear Motor
Ice Level
Sensor
January 2000
Page 15
NME954R & FME1204R
COMPONENT DESCRIPTION: Control Box
Contactor: A definite purpose contactor
connecting the compressor and the remote
condenser fan motor to the power supply.
Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are for
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.
Potential Relay: The compressor start relay.
On/Off (Mode) Switch: Manual control for the
machine.
Control Board
Water OK Light
Power Light
Service Light
Freeze Light
Bin Full
Light
LED1
Compressor
Relay
LED3
January 2000
Page 16
Auger
Relay
ELECTRICAL SEQUENCE:
NME954R & FME1204R
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: Switch the power to the machine OFF
and then ON.
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 17
NME954R & FME1204R
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.
Water
Inlet
Reservoir
Drain Tube
Water Level
Drain
Water Schematic
January 2000
Page 18
OPERATION: Refrigeration
NME954R & FME1204R
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
it then 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.
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.
Refrigeration Schematic
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.
System Information @ 90oF. air and 70oF. water.
Suction pressure: 35 PSIG
·
Discharge pressure: 255 PSIG
·
Minimum Discharge pressure (low temp): 180 PSIG
·
Compressor Amps
3 Phase - 2.8
·
Single Phase - 4.3
·
Remote Condenser
Discharge
Line
Head
Pressure
Control
Valve
Liquid Line
King
Valve
Detail Of Head Pressure
Control Valve
Liquid Line
Valve
Suction
Line
Thermostatic
Expansion Valve
Evaporator
Receiver
Compressor
January 2000
Page 19
NME954R & FME1204R
OPERATION: Refrigeration
Low Condensing Temperature
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. This forces more
refrigerant into the condenser (with a small amount
of discharge gas going into the receiver to maintain
SCHEMATIC OF DISCHARGE PRESSURE
CONTROL VALVE, Normal Temperature
Valve
From
Compressor
Disk
To Receiver
pressure the valve opens up the liquid line from the
condenser to the receiver.
SCHEMATIC OF DISCHARGE PRESSURE
CONTROL VALVE, Low Temperature
From
Compressor
To Receiver
From
Condenser
pressure until the head pressure is built back up to
the rated gauge pressure of 180 psig). At that
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. 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.
January 2000
From
Condenser
Page 20
NME954R & FME1204R
MAINTENANCE AND CLEANING
It is the USER’S RESPONSIBILITY to keep the ice machine and ice storage bin in a sanitary condition.
Without human intervention, sanitation will not be maintained. Ice machines also require occasional
cleaning of their water systems with a specifically designed chemical. That chemical dissolves mineral
build up that forms during the ice making process.
Sanitize the ice storage bin as frequently as local health cods require, and every time the ice machine is
cleaned and sanitized.
The ice machine’s water system should be
cleaned and santized a minimum of twice per
year.
ICE MAKING SYSTEM: In place cleaning
1. Check and clean any water treatment devices, if
any are installed.
2. Remove screws and 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 of water or milk.
Call Physician immediately.
In case of external contact,
flush with water. Keep out of
the reach of children.
11. After draining the reservoir, as in step 6, wash
and rinse the water reservoir.
12. Go thru steps 13-19 to sanitize the ice machine
water system.
13. Mix two gallons of sanitizer solution. Use an
approved sanitizer.
A possible sanitizer solution may be obtained by
mixing two gallons of warm (90-115
o
F.) potable
water with 1 ounce of household bleach.
14. Slowly pout the sanitizer solution into the water
reservoir until the float rises, then switch the
master switch ON.
15. As the ice machine uses water from the
reservoir, continue to pour the sanitizer solution
into the reservoir.
1
16. After
of the sanitizer solution has been added
2
to the reservoir, and the reservoir is nearly empty,
switch the master switch OFF.
17. Drain the reservoir and thoroughly wash the
interior of the reservoir and cover with sanitizer
solution. Be sure the drain hose is upright and
capped.
18. Remove the block from the float in the water
reservoir.
19. Switch the master switch to ON
20. 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.
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
21. Remove all ice from the storage bin.
22. Add warm water to the ice storage bin and
thoroughly wash and rinse all surfaces within the
bin.
23. Sanitize the bin interior by washing the interior
of the bin with the balance of the sanitizer solution.
24. Switch the master switch ON.
25. Return all panels to their original positions.
Page 21
NME954R & FME1204R
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.
3. Clean the remote condenser. Use a vacuum
cleaner or coil cleaner if needed.
Do NOT use a wire brush.
4. Check and tighten all bolts and screws.
January 2000
Page 22
Clean the Probe's Tip with ice
machine cleaner and a clean,
soft cloth.
Bearing Maintenance
NME954R & FME1204R
The top bearing in the breaker should be checked
at least two times per year.
Check the breaker bearing by:
removing the ice chute cover
·
Chute Cover
unscrewing the ice sweep
·
Ice Sweep
unscrewing the auger stud
·
Auger Stud
Cap Screw
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.
·
removing the water shed
O
f
f
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.
Needle
Breaker
Cover
·
unscrewing the breaker cover (left hand thread)
January 2000
Page 23
NME954R & FME1204R
Auger Maintenance
In some areas the water supply to the ice maker
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.
Moving parts hazard.
Moving parts can cause
personal injury.
Disconnect power before
beginning to service
components.
Allen
Screws
Breaker &
Bearing &
Auger
Assembly
1. To remove the auger, remove the front and top
panels.
2. Push back bail clamp holding ice chute cover to
ice chute, and remove cover.
3. Unscrew and remove ice sweep.
4. Rremove 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.
Clean the auger and evaporator as required.
DO NOT HONE THE EVAPORATOR.
7. Replace the water seal.
8. Reverse to reassemble.
January 2000
Page 24
NME954R & FME1204R
SERVICE DIAGNOSIS: No Ice
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 interruption 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
Low or high pressure controls open
Circuit board gear motor relay will not
close
Water level or ice level sensor failed Check / replace sensor
No ice, auger motor is turning Compressor contactor coil is open Check / replace contactor
Compressor will not start Check start capacitor
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
Check / replace board
Check start relay
Check compressor windings
Check pump down switch contacts
January 2000
Page 25
NME954R & FME1204R
SERVICE DIAGNOSIS: Low Capacity
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
Evaporator water seal leaks Check base of evaporator & drip pan.
Excessive ice meltage Bin drain clogged Clean out bin drain
Clean the condenser
Clean the water system
repair leak, replace dryer, evacuate
and weigh in the nameplate charge.
If the seal leaks, shut off the wter,
remove the auger, replace the water
seal. Check gear motor for water
infiltration.
Poor fit between bin door and door
frame
Machine makes too much noise Evaporator coated internally with
minerals
Motor bearings dry Oil or replace motor
Adjust or replace
Clean with Scotsman Ice Machine
Cleaner
January 2000
Page 26
CONTROL SYSTEM DIAGNOSTICS
NME954R & FME1204R
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.
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.
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
January 2000
Page 27
NME954R & FME1204R
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls
WATER RESERVOIR
1. Shut off the water supply to the ice maker.
2. Remove front panel and reservoir cover.
3. To remove float only, disconnect water inlet
compression fitting at reservoir inlet.
4. Push in the tab behind the reservoir and pull the
valve assembly up and out of the reservoir tank.
5. To remove reservoir, remove drain hose from
reservoir.
6. Remove evaporator inlet hose from reservoir.
7. Remove mounting screws from reservoir
bracket, and remove reservoir from ice maker.
8. Reverse to reassemble.
Float
Assembly
Water
Sensor
Slide Bin
Controls to
Remove
Ice Chute
Locking
Tabs
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.
January 2000
Page 28
NME954R & FME1204R
REMOVAL AND REPLACEMENT: Bearing and Breaker
Note: Removal of the auger, water seal, evaporator
and gear motor must begin at the top of the
assembly.
To Remove the Breaker Bearing Assembly:
Moving Parts Hazard.
Disconnect electrical
power before beginning.
1. Remove panels and disconnect electrical power.
2. Push back bail clamp 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 the breaker cover from breaker (left
hand threads)
b. Unscrew auger stud from top of auger.
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 (such as
2” PCV coupling) 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.
c. Unscrew 4 allen head cap screws holding
breaker to evaporator.
Note: Flaker Components Shown, Nugget Similar, but Without Slotted Collar.
Step 5-a Step 5-b Step 5-c and Step 6
Ice
Sweep
Auger
Stud
Slotted
Collar
Allen
Screws
January 2000
Page 29
NME954R & FME1204R
REMOVAL AND REPLACEMENT: Auger
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.
Moving Parts Hazard.
Rotating parts can
cause personal injury.
Disconnect electrical
power before beginning.
2. The auger and breaker/bearing may now be
removed as an assembly.
a. Unscrew 4
allen head cap
screws holding
Breaker
Bearing
Assembly
breaker to
evaporator.
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.
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.
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.
Thread
Into
Auger
Stop
Slide Hammer Puller
Removing Auger
Drive Slide Up
Against Stop To
Loosen 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.
January 2000
Page 30
NME954R & FME1204R
REMOVAL AND REPLACEMENT: Water Seal
To Remove the Water Seal:
(Assuming all steps to remove the auger have
been performed.)
1. The gear motor/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 gear motor assembly. Lift the
evaporator up and off of the gear motor.
3. Remove the snap ring or wire retainer from the
grove under 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 retaining ring.
2. Replace the retaining 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.)
Water Seal
Retaining Ring
REMOVAL OF THE
WATER SEAL
4. Pull or drive out the lower half of the water seal.
Place A Bead Of
Food Grade
Sealant Here
CAUTION
Do not get any sealant onto the face of the 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 gear
motor.
January 2000
Page 31
NME954R & FME1204R
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 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 gear motor 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.
January 2000
Page 32
NME954R & FME1204R
REMOVAL AND REPLACEMENT: Gear Motor Assembly
To Check the Motor:
Electrical Shock
Hazard.
Disconnect electrical
power before beginning.
1. Remove wires from terminals 1 and 2.
2. Use an ohmmeter to check for continuity and
grounds. If there is continuity but the motor will not
start, check the motor's start switch.
3. Remove the motor end bell or motor stator. With
the ohmmeter wires attached to 1 and 2 move the
centrifugal switch actuator up and down to simulate
motor speed. If the ohmmeter does not show any
change, or shows and open circuit, replace the
switch or motor.
To Remove and Repair the Gear motor
Assembly:
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 you lower the cover
onto the lower case, 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 gear motor, check for oil leaks,
noise, and amp draw.
(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 gear motor to the unit.
3. Remove the gear motor from
the ice maker.
To Inspect the gear motor.
A) Remove the cap screws
holding the gear motor 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.
Water
Shed
Cover and
Output Gear
Assembly
Centrifugal
Switch
Rotor
Bearing
C) Inspect the oil, gears, and
bearings. If the oil level and
condition is acceptable, quickly
January 2000
Page 33
NME954R & FME1204R
Refrigeration Service
This ice machine uses R-404A refrigerant and
polyolester oil. Do NOT use mineral oil in this
refrigeration system.
R-404A is a “Near Azeotrope” so liquid charging
·
is required:
When the system is serviced, a special liquid
·
line drier is required. It is included with
replacement compressors.
R-404A is not compatible with mineral oil, so
·
these ice machines use Polyolester oil.
Polyolester oil absorbs water very easily. When
one of these refrigeration systems is opened for
service, it must be re-sealed as soon as
possible (15 minutes maximum).
Special leak detection equipment is required to
·
locate small refrigerant leaks. Usually a leak
detector capable of detecting a Halongenated
refrigerant or HFC-134a will work. Check with
the leak detector manufacturer if in doubt.
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 remove the core cap.
· Close the valve and replace the caps when the
job is finished. The valve must be closed and
the caps must be on or the valve will leak.
Charging Procedures
·
Extra care must be taken when recharging this
remote system. No liquid refrigerant may be
placed in the system at the compressor. DO
NOT use the access valves at the front of the
unit for weighing in the charge. All liquid
refrigerant must be weighed into the receiver
through the front seated "king valve".
ALLEN
WRENCH
Torque Stem
to 6-8 ft. lb..
Front Seated
King Valve
Torque Cap to
8-12 ft. lb..
ACCESS
VALVE
Torque Cap to
7-12 ft. lb..
Receiver
Service Port
January 2000
Page 34
Charging
Cylinder
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