N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Introduction
This ice machine is the result of years of
experience with flaked and nugget ice machines.
The latest in electronics has been coupled with the
time tested Scotsman flaked ice system to provide
The features include simple conductivity water level
sensing, evaporator clearing at shut down,
photo-eye sensing bin control and the ability to add
options.
reliable ice making and the features needed by
customers.
This user and installation manual is organized in
three main sections: installation, operation, and
maintenance.
Table of Contents Man
Installation: ................................................Page 2
Location: ..................................................Page 3
Cabinet Layout ...............................................Page 4
Unpacking .................................................Page 5
Water ....................................................Page 6
Electrical ..................................................Page 7
Refrigeration ................................................Page 8
Final Check List ..............................................Page 9
Initial Start Up ...............................................Page 10
Controller ..................................................Page 11
AutoAlert and Display Code ........................................Page 12
Component Indicator Lights ........................................Page 13
Electrical Component Details .......................................Page 14
Sequence of Operation ..........................................Page 15
Electrical Sequence with Condensing Unit ................................Page 16
Water System ...............................................Page 17
Remote Refrigeration with Condensing Unit ................................Page 18
How Ice Is Made ..............................................Page 19
Scale removal ...............................................Page 20
Check Top Bearing .............................................Page 21
Bearing Service ..............................................Page 22
Options ...................................................Page 23
Options: Bin Thermostat ..........................................Page 24
Service Diagnosis .............................................Page 25
Service Diagnosis - Optional Ice Level Controls ..............................Page 26
Repair Procedures: Bearing And Breaker .................................Page 27
Repair Procedures: The Auger .......................................Page 28
Auger and Evaporator Inspection .....................................Page 29
Repair Procedures: The Water Seal: ...................................Page 30
Repair Procedures: Replace the Evaporator: ...............................Page 31
Repair Procedures: The gear reducer ...................................Page 32
Repair Procedures: Thermostatic Expansion Valve ............................Page 33
September 2009
Page 2
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Installation:
This machine is designed to be used indoors, in a
controlled environment. Operation outside the limits
listed here will void the warranty.
Air temperature limits
Minimum Maximum
o
Ice maker 50
F. 100oF.
Water temperature limits
Minimum Maximum
o
All models 40
F. 100oF.
Water pressure limits (potable)
Minimum Maximum
All models 20 psi 80 psi
Voltage limits
The quality of the water supplied to the ice machine
will have an impact on the time between cleanings
and ultimately on the life of the product. Water can
contain impurities either in suspension or in
solution. Suspended solids can be filtered out. In
solution or dissolved solids cannot be filtered, they
must be diluted or treated. Water filters are
recommended to remove suspended solids. Some
filters have treatment in them for suspended solids.
Check with a water treatment service for a
recommendation.
RO water. This machine can be supplied with
Reverse Osmosis water, but the water conductivity
must be no less than 10 microSiemens/cm.
Potential for Airborne Contamination
Installing an ice machine near a source of yeast or
similar material can result in the need for more
frequent sanitation cleanings due to the tendency
of these materials to contaminate the machine.
Minimum Maximum
115 volt 104 126
Minimum conductivity (RO water)
•
10 microSiemens / CM
Water Quality (ice making circuit)
•
Potable
Most water filters remove chlorine from the water
supply to the machine which contributes to this
situation. Testing has shown that using a filter that
does not remove chlorine, such as the Scotsman
Aqua Patrol, will greatly improve this situation.
Warranty Information
The warranty statement for this product is provided
separately from this manual. Refer to it for
applicable coverage. In general warranty covers
defects in material or workmanship. It does not
cover maintenance, corrections to installations, or
situations when the machine is operated in
circumstances that exceed the limitations printed
above.
November 2009
Page 2
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Location:
While the machine will operate satisfactorily within
the air and water temperature limits, it will operate
more efficiently when those temperatures are
nearer the lower limits. Avoid locations that are hot,
dusty, greasy or confined.
Options
The standard machine will make ice until ice fills
the bin and blocks an infrared light beam inside the
bottom of the machine. A field installed kit is
available to adjust the ice level lower. That kit
number is KVS.
The standard controller has excellent diagnostic
capabilities and communicates to the user through
the AutoAlert light panel, seen through the front
panel. There is a field installed kit that can log data
and provide additional information when the front
panel is removed. That kit number is KSBU. A
similar kit adds network connectivity, and its
number is KSBU-N
ID150 – use KBT42, KDIL-N-150 (includes
•
KVS, KNUGDIV and R629088514)
ID200 – use KBT43 and KNUGDIV and KVS
•
ID250 – use KBT43 and KNUGDIV and KVS
•
See sales literature for other brand model ice and
beverage dispenser applications.
Other Bins & Applications:
Note the drop zone and ultrasonic sensor locations
in the illustrations on the next page.
Scotsman ice systems are designed and
manufactured with the highest regard for safety
and performance.
Scotsman assumes no liability of 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.
Bin compatibility
All models are the same width: 22 inches. All
models are the same depth: 24 inches.
Bin & adapter list:
•
B222S – no adapter needed
•
B322S – no adapter needed
•
B330P – Use KBT27
•
B530P – Use KBT27
•
B530S – Use KBT27
•
B842S – Use KBT39
•
B948S - Use KBT38 for a single unit
•
B948S – Use KBT38-2X for two units side by
side
•
BH1100, BH1300 and BH1600 upright bins
include filler panels to accommodate a 22
inch wide ice machine. No adapter is
needed.
Dispenser compatibility
Scotsman reserves the right to make design
changes and/or improvements at any time.
Specifications and design are subject to change
without notice.
Only nugget ice models may be used with ice
dispensers. Flaked ice is not dispensable.
September 2009
Page 4
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
24.00
REF.
61
22.00 REF.
55.9
2.92
7.4
6.48
16.5
2.81
7.1
4.30
10.9
16.00
40.6
12.00
30.5
ICE DROP
OPENING
PLAN VIEW
ULTRA SONIC
BIN LEVEL
SENSOR
OPTIONAL
22.00
55.9
27.00
[68.6]
22.89
58.1
FRONT VIEW
24.00
61
LEFT SIDE VIEW
13.40
34
1.59
4
2.68
6.8
14.36
36.5
16.86
42.8
18.86
47.9
21.86
55.5
BACK VIEW
SUCTION LINE
5/8" MALE CPLG.
LIQUID LINE
3/8" MALE CPLG.
3/4" FPT D RAIN
3/8"FLARE
MACHINE
WATER INLET
120 VOLT CORD
Remote Low Side Service Manual
Cabinet Layout
Note: Bin Top Cut-outs for
drop zone should include
ultrasonic sensor location
September 2009
Page 5
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Unpacking
Remove the carton from the skid. Check for hidden
freight damage, notify the carrier immediately if any
is found. Retain the carton for the carrier’s
inspection.
The machine is not bolted to the skid. If strapped
remove the strap.
Place on Bin or Dispenser
If reusing an existing bin, be sure that the bin is in
good shape and that the gasket tape on the top is
not torn up. Water leaks, not covered by warranty,
could result from a poor sealing surface. Because
this is a remote low side, a new bin is
recommended due to the high cost to the user of
replacing an old bin when a remote system is on
top.
Install the correct adapter, following the directions
supplied with that adapter.
Hoist the machine onto the adapter.
Note: The machine is heavy! Use of a mechanical
lift is recommended.
Panel Removal
1. Locate and loosen the two screws at the front
edge of the top panel.
2. Pull the front panel out at the top until it clears
the top panel.
3. Lift the front panel up and off the machine.
4. Remove two screws at the front of the top panel.
Lift up the front of the top panel, push the top panel
back an inch, then lift to remove.
5. Locate and loosen the screw holding each side
panel to the base. Left side panel also has a screw
holding it to the control box.
6. Pull the side panel forward to release it from the
back panel.
Button Switch Bezel
To change bezels: Remove the front panel, and
refer to the instruction label on the inside of the
front panel. Push snaps of standard bezel in and
pull the bezel out of the front panel trim strip.
Position the machine on the bin or adapter. Secure
with straps from the hardware bag packed with the
machine, or those supplied with the adapter.
Remove any plastic covering the stainless steel
panels.
Note: The standard machine set up includes visible
on and off switches. Those can be covered up by
changing the bezel in the front panel’s trim strip. A
cover-up bezel is included with the hardware bag.
Remove any packaging, such as tape or foam
blocks, that may be near the gear reducer or ice
chute.
Level the bin and ice machine front to back and left
to right by using the bin leg levelers.
Locate other bezel. Push into the trim strip from the
front until it snaps into place. Return the front panel
to its original position and secure it to the cabinet
September 2009
Page 6
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Water
The water supply for ice making must be cold,
potable water. There is a single 3/8” male flare
potable water connection on the back panel.
Drain
There is one ¾” FPT condensate drain fitting at the
back of the cabinet.
Tubing
Connect the potable water supply to the potable
water fitting, 3/8” OD copper tubing or the
equivalent is recommended.
Connect the drain tube to the
condensate drain fitting.
Do not Tee ice machine drains into
the drain tube from the ice storage
bin or dispenser. Back ups could
contaminate and / or melt the ice in
the bin or dispenser.
Follow all local and national codes for
tubing, traps and air gaps.
Potable Water
Inlet
Condensate
Drain
September 2009
Page 7
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Electrical
The machine includes a power cord, connect to the
proper electrical power supply. A separate circuit is
recommended.
If a dedicated condensing unit is connected to this
machine, it will have a separate power supply.
Do not use an extension cord.
Follow all local and national codes.
Model*
N0622L-1 22 x 24 x 27 115/60/1 5.8 15
N0922L-1 same 115/60/1 5.8 15
N1322L-1 same 115/60/1 5.8 15
F0822L-1 same 115/60/1 5.8 15
F1222L-1 same 115/60/1 5.8 15
F1522L-1 same 115/60/1 5.8 15
Dimensions
w"xd"xh"
Voltage
Volts/Hz/Phase
Min Circ Ampacity Max Fuse Size
September 2009
Page 8
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Refrigeration
BTUH Capacity Requirements
Model BTUH
N0622L or F0822L 4,000
N0922L, F1222L 5,000
F1522L 7,200
Condensing Units
Model Use Condensing Unit
N0622L or F0822L NME654-RHS-A/C
N0922L or F1222L NME954-RHS-A/C
N1322L or F1522L None - rack only
Remote low side models require connection to
a dedicated condensing unit or a rack system.
Recommended Tubing from Head to Condensing
Unit
• Suction Line: 5/8" OD
•
Liquid Line: 3/8" OD
Distance limits:
•
Maximum distance between dedicated
condensing unit and head: 75 feet.
•
Condensing Unit Elevation over Ice Making
Section: 35 feet.
Roof Attachment
Install and attach the remote condensing unit 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.
Refrigeration Installation:
Connections
The liquid and suction fittings on the back of the
cabinet are stubs. The liquid line size is 3/8" OD.
The suction line size is 5/8" OD.
1. Recover holding charge
2. Cut the stubs off.
3. Braze line set tubing to each fitting. Sweep with
dry nitrogen while brazing.
4. Dedicated condensing unit: Evacuate complete
system to 50 microns.
5. Open the ball valves.
Rack: The skills of a refrigeration technician who is
knowledgeable about the rack are required to
connect the ice machine to the building’s
refrigeration system.
Notes:
Note: Elevations greater than 20 feet require
installation of a suction line trap at the 10 foot
mark.
Ice Making Section
•
Elevation over Condensing Unit: 15 feet.
Line Routing:
•
Allowed: One rise after a drop.
•
Allowed: One drop after a rise.
•
Not Allowed: More than one rise after a drop
•
Not Allowed: More than one drop after a rise
•
•
•
Dedicated condensing unit: Add refrigerant charge.
Recommended field charge:
•
•
•
October 2009
Page 8
R-404A models: 1.5 ounces of R-404A
refrigerant is in the system as a holding
charge.
Be sure the liquid connection is NOT in
series with another liquid line valve.
Local Codes must be observed.
N0622L or F0822L: 8 lb R-404A
N0922L or F1222L: 8 lb R-404A
N1322L or F1522L: Rack only
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Final Check List
After connections,
1. Wash out the bin. If desired, the interior of the
bin could be sanitized.
2. Locate the ice scoop (if supplied) and have it
available for use when needed.
Final Check List:
1. Is the unit located indoors in a controlled
environment?
2. Is the unit located where it can receive adequate
cooling air?
3. Has the correct electrical power been supplied to
the machine?
4. Have all the water supply connections been
made?
5. Have all the drain connections been made?
6. Has the unit been leveled?
Control Operation
Use and Operation
Once started, the ice machine will automatically
make ice until the bin or dispenser is full of ice.
When ice level drops, the ice machine will resume
making ice.
Caution: Do not place anything on top of the ice
machine, including the ice scoop. Debris and
moisture from objects on top of the machine can
work their way into the cabinet and cause serious
damage. Damage caused by foreign material is not
covered by warranty.
Power
Status
No
Water
Time to
Clean
On
Off
7. Have all unpacking materials and tape been
removed?
8. Is the correct switch bezel installed in the trim
strip?
9. Is the water pressure adequate?
10. Have the drain connections been checked for
leaks?
11. Has the bin interior been wiped clean or
sanitized?
12. Have any water filter cartridges been replaced?
13. Have all required kits and adapters been
properly installed?
14, Has the ice machine been properly connected
to the condensing unit or rack?
There are four indicator lights at the front of the
machine that provide information on the condition
of the machine.
Indicator Lights:
•
Power
•
Status
•
Water
•
De-scale & Sanitize
There is front access to two switches – On and Off.
To switch the machine OFF, push and release the
Off button. The machine will shut off at the end of
the next cycle.
To switch the machine ON, push and release the
On button. The machine will go through a start up
process and then resume ice making.
September 2009
Page 10
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Initial Start Up
1 Turn the water supply on.
2 Switch the electrical power on. Confirm
voltage is correct for the model.
3 Push and release the On button. The
machine will start up in about two minutes.
The liquid line valve will open and liquid
refrigerant will flow into the machine. For the
units connected to a dedicated condensing
unit, the resulting increase in suction pressure
will start the condensing unit.
4 Those units connected to a dedicated
condensing unit will begin discharging warm
air from the remote condenser. After about 5
minutes, ice will begin to drop into the bin or
dispenser.
5 Check the machine for unusual rattles.
Tighten any loose screws, be sure no wires
are rubbing moving parts. Check for tubes
that rub.
6 The EPR valve should maintain low side
pressure at a minimum of 36 PSIG + or - 2
PSIG.
All models need scale removed from the
•
water system.
All models require regular sanitization.
•
All models require sensor cleaning.
•
All models require a top bearing check.
•
Maintenance Frequency:
Scale removal
conditions it might be every 3 months. The yellow
De-Scale & Sanitize light will switch on after a set
period of time as a reminder. The default time
period is 6 months of power up time. There are 4
available time period intervals: 1 year, 0 or
disabled, 6 months or 4 months.
Sanitizing
often as needed to maintain a sanitary unit.
Sensor Cleaning
Top bearing check
time the scale is removed.
Maintenance:
. At least twice a year, in some water
: Every time the scale is removed or as
: Every time the scale is removed.
: At least twice a year or every
Remote air cooled condenser
Note: Machines will operate and make ice at the
factory EPR setting. For optimum performance,
adjust the EPR to the settings in the chart below:
Model Number
N0622L / F0822L Full open 30 PSIG
N0922L / F1222L Full open 30 PSIG
N1322L / F1522L Not specified 26 PSIG
Superheat will be 12oF, + or - a few degrees.
7 Fill out the warranty registration form and
either file it on line or mail it.
8 Notify the user of the maintenance
requirements and whom to call for service.
Maintenance
This ice machine needs five types of maintenance:
•
Remote condensing units need their
condenser coils cleaned regularly.
Scotsman
Condensing Unit
Rack
The condenser fins will occasionally need to be
cleaned of leaves, grease or other dirt. Check the
coil every time the ice machine is cleaned.
Maintenance:
The front and side panels are durable stainless
steel. Fingerprints, dust and grease will require
cleaning with a good quality stainless steel cleaner
Note: If using a sanitizer or a cleaner that contains
chlorine on the panels, after use be sure to wash
the panels with clean water to remove chlorine
residue.
Maintenance:
If the machine has been connected to water filters,
check the cartridges for the date they were
replaced or for the pressure on the gauge. Change
cartridges if they’ve been installed more than 6
months or if the pressure drops too much during
ice making.
Exterior Panels
Water filters
November 2009
Page 11
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Clean
Code
Display
Component Operation Indicator Lights
Code Description
.... ....FreezeMode
flashes . . Freeze Mode is Pending
.... ....BinisFull
.... ....Clean Cycle
.... ....BoardLocked
.... ....TestMode
.... ....Off
.... ....SelfTestFailed
flashes. . No ice sensed - Retrying
..... ....Noicesensed-ShutDown
flashes . Auger motor high load - Retrying
.... ....Auger motor high load - Shut Down
.... ....Nowaterinreservoir
.... ....Refrigeration pressure too high / low
- Unit Remotely
Locked Out - Contact Leasing Company
F
F
b
C
L
d
O
E
1
1
2
2
3
4
All 4 Upper Lights Flashing
Control Operation - See Manual
Water Light On
De-Scale Light On
Test Mode
Recall Diagnostic Codes
Clear Diagnostic Codes
Reset from Code 1, 2, 3 or 4
- Restore water supply to
machine.
- Clean and sanitize
machine.
- Depress Off for 3 seconds,
then depress Clean for 3 seconds.
- Depress Off
for 3 seconds. Press Clean repeatedly to
go from most recent to oldest of 10.
- Switch unit off,
depress and hold Clean and Off for 3
seconds.
- Depress
Off then Depress On.
Technician Section
02-4407-01
On Off
Power
Status
De-scaleWater
Sanitize
Remote Low Side Service Manual
Controller
Location of
Optional
Vari-Smart
Location of
Optional
Smart-Board
September 2009
Page 12
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
AutoAlert and Display Code
The controller uses indicator lights to provide the
user with information on Power, Status, Water or
Time to Clean. These are known as the AutoAlert
panel.
Code Description
F Freeze Mode
F flashes Freeze Mode is Pending
b Bin is Full
C Clean Cycle
L Board Locked
d Test Mode
O Off
E Self Test Failed
1 flashes No ice sensed - Retrying
1 No ice sensed - Shut Down
2 flashes Auger motor high load - Retrying
2 Auger motor high load - Shut Down
3 No water in reservoir
All 4 Upper Lights Flashing - Unit Remotely Locked
Out - Contact Leasing Company
The Status light is on Green when the machine has
been switched to the ice making mode. It will also blink
green if the unit has been equipped with an optional
Smart-Board AND the Smart-Board has detected
potential malfunction.
Additionally a 7 segment display is under the front
panel. It shows operational status or problem
The Water light will blink Red if the water sensor
does not detect water.
codes.
The De-Scale / Sanitize light will glow Yellow when
The Power light is on Green anytime the machine
is supplied with electrical power.
the time to clean timer has reached its set time
since the last cleaning. It also blinks during the first
part of the cleaning mode.
Indicator Lights & Their Meanings
Light Actions Power Status Water
De-Scale &
Sanitize
Steady Green Normal Normal - -
Switching on or off.
Blinking Green Self Test Failure
When Smart-Board
used, machine attention
--
recommended.
Blinking Red - Diagnostic shut down Lack of water -
Yellow - - -
Time to descale
and sanitize
Blinking Yellow - - - In Cleaning Mode
Light Off No power Switched to Off Normal Normal
All Blinking Unit is remotely locked out - check with leasing company
September 2009
Page 13
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Component Indicator Lights
The controller has six lights to indicate component
operation:
Bin Eyes Blocked
This light is ON when the photo-electric ice
•
sensors have been blocked by ice.
Water Present
This light is ON when the water sensor has
•
water touching it.
Comp
May light but is not used on this model.
•
Water Dispense
Not used on this model.
•
Auger
This light is ON when the auger motor is
•
operating.
Control Button Use
Recall diagnostic code:
Hold off button in for 3 seconds. Release.
•
Press and release the Clean button to cycle
•
through each of the last 10 error codes from
most recent to oldest.
Clear diagnostic code:
Hold Clean and Off buttons in for 3 seconds
•
to clear all prior codes.
Reset control:
Depress and release Off, then depress and
•
release On
Start Test Mode:
Hold Off button in for 3 seconds. Release.
•
Hold Clean button in for 3 seconds. Release.
•
Lock / Unlock control:
Ice Dispense
•
Not used on this model.
•
Hold On button in for 3 seconds, keep
holding then press and release Off twice.
September 2009
Page 14
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Electrical Component Details
Liquid line valve
Opened by the controller to start ice making.
•
Closed to shut unit off. Line voltage coil.
Controller
Senses water, ice making, and auger amps.
•
Controls liquid line solenoid coil and auger
motor. Indicates status and component
operation.
Transformer
12 volt secondary, supplies power to
•
controller only. The Power light will be ON
when the transformer has provided 12 volts
AC to the controller.
Water Level Sensor
Two probe conductivity sensor. When water
•
touches it the Water Present light will be ON.
Auger Motor
•
Four pole, split phase motor that operates
the gear reducer. When operating, the Auger
indicator light will be ON. The gear reducer
lowers the input speed from about 1500 RPM
to 11. Auger rotation is CCW when viewed
from above.
Photo-electric eyes
•
An LED emitter and photo transistor receiver
set. Pulsed infrared light is continuously
emitted and received to detect ice in the
chute.
Chute Thermostat
•
A secondary shut off device to stop the
machine's operation if the photo-electric eyes
fail to.
September 2009
Page 15
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Sequence of Operation
The ice machine’s function is to continuously
produce ice until the ice level control senses that
there is enough ice in the bin or dispenser. There
are three systems that operate in close
coordination to make ice. They are the electrical
system, the water system and the refrigeration
system.
The electrical system is the auger drive assembly,
liquid line solenoid valve and control system (the
auger drive assembly includes the gear reducer,
auger and top bearing).
The water system includes the float valve,
reservoir, inside of the evaporator and the drain
tubing.
The refrigeration system includes the
thermostatic expansion valve and outside of the
evaporator.
Control System
As noted, the electrical system includes a control
system. The control system consists of a controller
and sensors. It automatically operates the machine
to make ice only when needed. It also monitors the
water system and auger drive assembly for proper
function.
Sensors are used to monitor the machine. A
continuity probe water sensor is located near the
float reservoir. A tube from the float tank allows
water to touch the sensor’s two stainless steel
probes, making a connection between them. That
signals to the controller the presence of water. The
controller will now allow the machine to make ice
unless this sensor's probes have continuity.
A set of photo-electric eyes (infrared emitter and
receiver) is located at the base of the ice discharge
chute. They are used to sense ice. As ice is made,
it falls through the infrared beam from the emitter,
causing the receiver to detect it. When ice has filled
the bin, the top of the ice pile will continuously stop
the beam, breaking the light to the receiver, and
that signals to the controller that the bin is full.
Additionally, the control system uses the
photo-eyes to confirm ice making. As the machine
makes ice, the falling ice causes breaks in the
infrared beam. In operation, the first 6 minutes of
ice making are ignored to give the machine time to
start producing ice. After that, the controller will
look for a minimum of one beam-break in 10
minutes. If this is not achieved, the control will shut
the machine down for 10 minutes and add the
incident to a strike counter. During the wait period,
a 1 will be flashing in the code display.
After the 10 minute wait, the machine will restart. If
no ice is sensed three times in a row, the machine
will shut down on a no ice error and must be
manually reset. The 1 in the code display will
change from flashing to continuous.
If ice is detected within 10 minutes after any restart,
the strike counter will be reset to zero, and the
code display will show F, for freeze mode.
The auger drive motor amperage is monitored by
the controller. If the auger motor is overloaded and
is drawing too many amps, the controller will shut
the machine off, and a 2 will be flashing in the code
display. The controller will attempt a restart of the
auger motor in 4 minutes. If during the first 60
seconds after restart the auger motor current stays
within limits, the compressor is restarted 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 2 in the code display will change from
flashing to continuous.
Water System
The water level in the evaporator is maintained by
a float valve in a separate reservoir. As ice is
made, and water is used, the water level in the
reservoir drops, opening the float valve. The open
valve adds water to the reservoir to resupply it.
September 2009
Page 16
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Electrical Sequence with Condensing Unit
Pushing and releasing the On button starts the
machine. The sequence of operation begins with
water. Water must be sensed or the controller will
not start the ice making process. If there is no
water, a 3 will show it the code display. If there is
water, and there is nothing blocking the infrared
beam of the ice sensors, the controller will start the
machine. A flashing F will show in the code display
while the auger drive motor starts up. When it has
started, the liquid line valve will open and the
flashing F will change to a continuous F.
An open liquid line valve allows refrigerant to flow
from the condensing unit into the evaporator and
suction line. That raises the suction pressure at the
condensing unit, causing the low pressure switch to
close, starting the compressor.
Ice making continues until the ice level control
senses a full bin, at that time the compressor is
shut off, and the auger motor continues to operate
for a short time to clear the evaporator of any left
over ice. A b will show in the code display.
September 2009
Page 17
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Water System
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 float valve maintains a constant level of water
in the reservoir and evaporator, as water flows out
the bottom of the reservoir tank to fill the
evaporator.
Reservoir overflow or evaporator condensation is
routed to the drain. Water cooled models have a
separate water circuit for the cooling water: it
enters the fitting at the rear, goes to the water
Water Level
regulating valve, then to the water cooled
condenser and down the drain.
Water Level: The correct water level should be
checked when the machine is making ice. Check
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 1/8" above
and 1/4" below the line. If needed, bend the float
arm up or down to adjust the water level.
Float Valve
and Reservoir
Condensate
Pan
Water Sensor
Evaporator
Water Inlet
Condensate Drain
Water System Schematic
September 2009
Page 18
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Remote Refrigeration with Condensing Unit
A condensing unit's compressor concentrates the
heat from ice making into high pressure, hot
discharge gas. The high pressure forces the gas to
the condenser. At the remote condenser, the
discharge gas will either enter the coils or bypass
them through the headmaster. The head master
maintains a minimum discharge pressure to keep
flash gas out of the liquid line.
From the condenser, refrigerant flows to the
receiver. It can be either liquid or gas, depending
upon the modulation of the head master.
From the receiver, liquid refrigerant flows to the ice
making head's thermostatic expansion valve. At the
expansion valve, liquid refrigerant passes from a
high pressure zone to one of relatively low
pressure, and in the low pressure zone it
evaporates, absorbing heat.
From the evaporator, the refrigerant, carrying the
heat from ice making, flows back to the compressor
through the suction line, and the cycle continues.
When enough ice has been made, the control
system closes the liquid line solenoid valve and the
condensing unit, when used, pumps down, forcing
refrigerant out of the low side until its pump down
pressure switch stops the compressor.
Liquid
Suction
Ice Making
Head
Generic
Condensing
Unit
TXV
EPR
Liquid Line
Valve
Remote Low Side Refrigeration Schematic
September 2009
Page 19
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
How Ice Is Made
Refrigeration effect is applied to the water between
the auger and the evaporator. When that water's
temperature drops to its freezing point, ice crystals
form throughout it. A continually rotating auger
moves the ice up the evaporator tube. At this point
the ice is a soft ribbon that fills the space between
the auger and evaporator.
At the top of the evaporator tube, ice emerges from
the water and is forced or extruded through
relatively small openings. This has the effect of
squeezing out excess water and compressing the
ice together into a useable form.
Ice flowing up from the openings is
forced to one side, breaking it
into smaller lengths. An ice
sweep moves them to the
chute.
Flaked ice machines have 6 oblong and curved
slots that ice flows from, and they produce a softer,
wetter ice form.
Nugget ice machines have 16 round holes that
form the nuggets, which is more heavily
compressed and contains less water than freshly
made flaked ice.
Cutaway View
of Bearing
Nugget or
Flaked Ice
Refrigerated
Tubing
Foam
Insulation
September 2009
Page 20
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Scale removal
Note: Following this procedure will reset the
de-scale and sanitize light.
1 Remove front panel.
2 Push and release the Off button.
3 Remove ice from bin or dispenser.
4 Turn the water supply to the ice machine OFF.
5 Drain the water and evaporator by
disconnecting the leg of the hose connected to
the water sensor and draining it into the bin.
Return the hose to its original position.
6 Remove the water reservoir cover.
7 Mix a solution of 8 ounces of Scotsman Clear
One Scale Remover and 3 quarts of 95-115
degree F. potable water.
12 Drain the water reservoir and evaporator by
disconnecting the leg of the hose connected to
the water sensor and draining it into the bin or
a bucket. Return the hose to its original
position. Discard or melt all ice made during
the previous step.
13 To sanitize the water system, mix a locally
approved sanitizing solution. An example of a
sanitizing solution is mixing one ounce of liquid
household bleach and two gallons of 95 – 115
degree F. water.
14 Pour the sanitizing solution into the reservoir.
15 Push and release the On button.
16 Switch the water supply to the ice machine on.
17 Operate the machine for 20 minutes.
18 Push and release the Off button.
Ice machine scale remover
contains acids. Acids can
cause burns.
If concentrated cleaner
comes in contact with skin,
flush with water. If swallowed,
do NOT induce vomiting.
Give large amounts of water
or milk. Call Physician
immediately. Keep out of the
reach of children.
8 Pour the scale remover solution into the
reservoir. Use a small cup for pouring.
9 Push and release the Clean button: the auger
drive motor and light are on, C is displayed and
the De-scale light blinks. After 20 minutes the
compressor will start.
10 Operate the machine and pour the scale
remover into the reservoir until it is all gone.
Keep the reservoir full. When all the scale
remover solution has been used, turn the water
supply back on. After 20 minutes of ice making
the compressor and auger motor will shut off.
19 Wash the reservoir cover in the remaining
sanitizing solution.
20 Return the reservoir cover to its normal
position.
21 Melt or discard all ice made during the
sanitizing process.
22 Wash the inside of the ice storage bin with the
sanitizing solution.
23 Push and release the On button.
24 Return the front panel to its original position
and secure with the original screws.
11 Turn the water supply to the ice machine OFF
September 2009
Page 21
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Bail Clamp
Remote Low Side Service Manual
Check Top Bearing
This task should only be done by a qualified
service technician
The bearing in the breaker should be checked at
least two times per year.
Check the bearing by:
1 Removing the bail clamp and ice chute cover
3 Removing the water shed & unscrewing the
breaker cover (left hand threads).
2 Unscrewing the ice sweep
Inspect the top of the bearing. When new the
grease is white, over time some gray will appear
over the rollers, that is normal. Add grease if gaps
between rollers are visible. If grease is watery, all
gray or rust is visible, have the bearing replaced.
See the next page for more information.
Note: When checking the top bearing, always
inspect the drip pan for water seal leaks. If water is
present in the drip pan, service the water seal and
check the gear reducer's lubricant. See the next
page.
September 2009
Page 22
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Bearing Service
This task should only be done by a qualified
service technician
If the bearing only needs grease, or to confirm the
quality of the grease low in the bearing, inject
grease into the lower part of 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.
Bearing
Needle, pn
02-3559-01
Drip Pan
Check Drip Pan For Water
Change De-Scale Notification Interval
This feature is accessible only from standby
(Status Light Off).
1. Press and hold Clean button for 3 seconds.
Starts the Time to Clean Adjustment State and
displays the current time to clean setting.
2. Press the clean button repeatedly to cycle
through the 4 possible settings:
If the grease is uniformly white, no further action is
needed. If very gray, rusty, wet or has any
embedded metal, have the bearing replaced.
September 2009
Page 23
•
1 year (8760 hours)
•
0 (disabled)
•
4 months (2920 hrs)
•
6 months (4380 hours) (default)
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
02-4294-01 Rev.A.
Adjust Ice Level
L
o
w
e
r
Bin
Full
Smart-Board Advanced Feature Control™
See Instructions for Available Features
34
SEL
02-4293-01
ENTER
ESC
01/07
02-4294-01 Rev. A.
Adjust Ice Level
L
o
w
e
r
Bin
Full
02-4294-01 Rev. A.
Adjust Ice Level
L
o
w
e
r
Bin
Full
Remote Low Side Service Manual
Options
Vari-Smart
Optional adjustable ice level control (KVS)
KVS
When this option is present there is an adjustment
post and an additional indicator light to the right of
the four indicator lights mentioned earlier. The
ultrasonic ice level control allows the user to control
the point that the ice machine will stop making ice
before the bin or dispenser is full. Reasons for this
include:
Seasonal changes in ice used
•
Planning to sanitize the bin
•
Faster turnover for fresher ice
•
Certain dispenser applications where
•
maximum ice level is not desired
There are several positions the ice level can be set
to, including Off (knob and label indicators lined
up), where it fills the bin until the standard bin
control shuts the machine off. See the kit’s
instructions for complete details.
Dispenser applications Nugget ice only:
Set the adjustment knob to
either the first or second
position CW after the
maximum fill position.
Smart-Board
Optional Advanced Feature Board (KSBU)
When this option is present there is an additional
display panel in the area below the main control
board. It is not visible when the front panel is on.
The Advanced Feature Board’s features include:
•
Seven day programmable ice level setting
when used with the optional Ultrasonic ice
level control
•
Recording of machine operation
•
Recall of malfunctions with the time they
occurred.
Note: There are two holes in the base for the
sensor: one for bins (nearest the back) and one for
dispenser applications.
Rotate the adjustment post to the desired ice level.
The machine will fill up to that level and when it
shuts off the indicator light next to the adjustment
post will be On.
Note: The maximum fill position
is when the arrow on the knob
points to the arrow on the label
Optional Remote Lock Out (KSL)
This add-on allows remote on-off control of the
machine, and is generally installed by leasing
companies. When the board has been remotely
locked out and shut off it must be reset by the
person or company that locked it out. It cannot be
reset on site.
September 2009
Page 24
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Options: Bin Thermostat
Another bin control method available on these
machines is a bin thermostat.
Type: Opens on temperature fall.
Connects: To blue wires to controller, in place of
the jumper connecting the blue wires between
terminals 5 and 6.
Use: In certain ice dispenser kits or whenever a
permanently lowered ice level is desired and a KVS
is not suitable.
Mounts: To the control box support strut.
Result when open: Machine shuts down, b in code
display.
Results when closed: Machine makes ice until
either the circuit opens or the photo-eyes are
blocked by ice.
Circuit voltage type: Low
September 2009
Page 25
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Service Diagnosis
Symptom Probable Cause Possible Correction
Check that ice machine and
No power
Code 3: No water Restore water
condensing unit, if used, both
have power. If power light is out,
check transformer.
No ice
Status light is off
Code 1: No ice sensed
Code 2: Auger motor draws too
many amps, controller shuts unit
off.
Bin Eyes Blocked light is On
Check stored codes, push and
release ON switch
Check for ice flow down chute. if
very slow or no ice being made,
check water inlet tubing for
restriction; check for condensing
unit or refrigeration system
failure
Check auger motor for power, if
no power, check controller
component indicator light. If
there is power to the motor,
check motor windings
Check that liquid line valve shuts
off tightly
Check for damage to gear
reducer or auger bearings.
Ice is in the chute.
No ice in the chute. Check
position of sensors, check
sensors for scale build up
Low ice making capacity
Check liquid line valve
Everything is in operation, but no
refrigeration effect
Scale build up
Suction tubing kinked Check suction tubing
Expansion valve superheat
incorrect
Unit overfills, chute thermostat
shuts system off
September 2009
Page 26
Check condensing unit
Check TXV
Check refrigerant charge
Remove scale from evaporator
and water system
Check superheat
Check photo-electric eyes for
proper shut off
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Service Diagnosis - Optional Ice Level Controls
Vari-Smart (KVS)
Symptom Probable Cause Possible Correction
Rotate knob to first position,
Adjustment knob set too low
knob's arrow pointing to the left
of the L in Lower (on the label)
No ice, bin full light is ON
No ice, b in code display, no bin
thermostat
No ice, power light on, bin full
light is OFF
Ice level too high
Bin Thermostat
Obstruction beneath sensor
Sensor recessed
Chute thermostat is open. Check chute thermostat
Photo-eye in chute blocked
Optional Smart-Board is
controlling ice level
Adjustment knob set to
maximum fill
Sensor wire disconnected
Check for and clear any item that
might be below the sensor
Check sensor, sensor must be
flush in its holder and not
recessed.
Check controller display code. If
a b, check for blockage or scale
build up on photo eyes in chute
Check for photo eye failure
Check Smart-Board settings.
Check if knob's arrow points to
label arrow.
Check for proper connection of
sensor wire to VS control board
Symptom Probable Cause Possible Correction
Check for ice on bin thermostat
capillary tube
No ice, b in code display Bin stat is open
Unit overfills, shuts off on
photo-eyes
Bin stat is stuck closed
September 2009
Page 27
Check for cold ambient in bin
Check continuity of bin
thermostat when capillary tube is
warm, replaced if does not close
Check position of bin thermostat
capillary tube.
Check continuity of bin
thermostat when ice is on the
capillary tube, replaced if does
not open
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: Bearing And Breaker
Note: Removal of the auger, water seal, evaporator
and gear reducer w/ motor must begin at the top of
the assembly.
To Remove the Breaker Bearing Assembly:
1. Remove panels and disconnect electrical power.
Electrical Shock Hazard.
Disconnect electrical power
before beginning.
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 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.
Note: Seals must be pressed in with a tool, they will
not install by hand. A 2" PVC coupling works well
as an insertion tool. Seals install open side up.
Lip seals must be lubricated with food grade
grease prior to assembly.
Apply Food
Grade
Grease Here
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.
•
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.
September 2009
Page 28
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: 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 the top panel.
2. Remove ice chute cover.
3. Unscrew ice sweep.
4. Remove ice chute body.
5. The auger and breaker/bearing may now be
removed as an assembly.
a. Unscrew 4 allen head cap screws holding
•
breaker to evaporator.
b. Lift up on breaker and remove auger from
•
evaporator.
Ice Sweep Removed
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 & remove breaker from evaporator.
•
e. 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, see the next page.
Remove allen head cap screws
September 2009
Page 29
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Auger and Evaporator Inspection
The auger must be carefully inspected for wear
and scale. There are also wear areas like the top
bearing surface and the edges of the flights. The
edges of the auger have horizontal serrations and
highly machined areas in between. If the auger has
contacted the evaporator wall, it will have very
rough flight edges and should be replaced.
Scale forms on the auger during normal ice
making. If scale is still on the auger after cleaning
in the ice machine, the scale can be removed using
ice machine cleaner and a nylon scrub pad.
Inspect the auger, the critical areas of the auger
are:
1. 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.
Caution: Ice machine cleaner is an acid. Handle it
with extreme care, keep out of the reach of
children.
2. 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 remove any sealant or debris from the
shoulder of the auger where the water seal was.
Inspect the evaporator's interior. The interior is
stainless steel that should be bright and shiny
when dry. If it isn't the scale on the surface must be
removed. To remove scale:
1. Remove the water seal; it will have to be
replaced.
2. Use a brass wire brush and scrub the interior of
the evaporator vertically to remove any scale.
3. Clean up any debris from the top of the gear
reducer.
Example of a Clean Auger
Example of Scale Build Up on Evaporator Wall
September 2009
Page 30
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: The Water Seal:
(Assuming all steps to remove the auger have
been performed.)
1. The gear motor/evaporator assembly will have to
be exposed.
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.
To Replace the Water Seal:
1. Lubricate the water seal with a thin coating of
food grade grease or oil, and push the water seal
into the bottom of the evaporator slightly past the
groove 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
sealant).
3. Remove the snap ring or wire retainer from the
groove under the water seal.
Snap Ring
4. Pull or drive out the lower half of the water seal.
Tip: Push one side of seal in so the seal is turned
90 degrees to the evaporator and pull it out.
Bottom of
Stationary
Water Seal
Sealant
Do not get any sealant onto the face of the seal.
6. Allow the auger and seal to air dry until the
sealant 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.
September 2009
Page 31
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: Replace the Evaporator:
(Assuming all the steps for removal of the thrust
bearing, breaker, auger, and water seal have been
performed.)
1. Close ball valves to isolate machine.
2. Recover the refrigerant from the ice maker.
3. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.
•
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.
4. Remove the evaporator.
5. Unsweat the drier from the liquid line.
6. After installing a new water seal in the new
evaporator (see “To Replace the Water Seal”)
sweat in the new evaporator at the old tubing
connections.
7. Install an new drier in the liquid line.
8. Evacuate the system until dehydrated, then
weigh in the nameplate charge. Check for leaks.
9. Install auger, breaker, breaker bearing
assembly, and ice discharge chute in reverse order
of disassembly.
10. Open ball valves.
To Reassemble the Evaporator and Auger
1. After the gear motor has been inspected, fasten
the evaporator to the gear motor. 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.
September 2009
Page 32
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: The gear reducer
(Assuming that the procedures through removal of
the water seal have been performed.)
Electrical Shock Hazard.
Disconnect electrical power
before beginning.
1. Remove the electrical wires from the gear drive
motor.
2. Unscrew the 4 cap screws holding the gear
motor to the ice machine.
3. Remove the gear motor from the ice maker.
To Inspect the gear motor.
1. Remove the cap screws holding the gear motor
case halves together and pry the two cases apart.
4. 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.
5. After the case is together, and the locating pins
are secure in both ends, replace all cap screws.
6. Bench test the gear motor, check for oil leaks,
noise, and amp draw.
2, 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.
3. 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.
Replacement Drive Motor
Gear Case Cover Assembly
Note: The gears and bearings are available only as
pressed together sets.
September 2009
Page 33
Gear Case with First and Second Gears
N0622L, F0822L, N0922L, F1222L, N1322L, F1522L
Remote Low Side Service Manual
Repair Procedures: Thermostatic Expansion Valve
1 Remove front panel.
2 If the machine was in operation, push and
release the off button to shut it down.
3 Disconnect electrical power.
4 Shut ball and liquid line access valves to
isolate machine.
5 Recover refrigerant from head.
6 Remove insulation covering expansion valve
and bulb.
7 Remove strap securing bulb to suction line.
8 Unsweat the expansion valve from the liquid
line. Remove it.
9 Unsweat the drier from the liquid line.
Remove it.
10 Connect nitrogen to discharge access valve.
11 Immediately place new valve in ice machine.
12 Open nitrogen bottle and braze expansion
valve inlet and outlet joints together. Braze
new drier into system.
13 Shut off nitrogen, shut access valves.
14 Evacuate to at least 300 microns.
15 Open ball and liquid access valves
16 Attach bulb to suction line. Position at 4 or 8
o'clock on the tube. Secure tightly but do not
crush the bulb with the strap.
17 Attach valve and bulb insulation.
18 Reconnect electrical power.
19 Return all panels to their original positions.
September 2009
Page 34
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