Installation and User Manual for
Model UF424 and UN324
UF424 / UN324 Installation and User Manual
To the owner or user: the service manual is intended
to provide you and the maintenance or service
technician with the information needed to install,
startup, clean, maintain and repair this product.
Observe any caution or warning notices. They are
important and provide notice of potential hazards.
Keep this manual for future reference.
If additional technical information is needed, go to
Scotsman’s website, www.scotsman-ice.com to
download a service manual.
Note: This is a commercial product. If service is
needed on a unit in a residence, warranty may be
limited. Use a commercial service company. Locate
one from the Scotsman website: www.Scotsman-ice.
com
Table of Contents
Specications ....................................................................................................................3
Cabinet Drawing ................................................................................................................4
Placement..........................................................................................................................5
Installation: Water and Drain ............................................................................................6
Initial Start up.....................................................................................................................7
Maintenance and Cleaning ................................................................................................8
Basic Troubleshooting .................................................................................................... 10
July 2018
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UF424 / UN324 Installation and User Manual
Specications
This ice maker is designed to be installed indoors, in a controlled environment. Although
it can operate in a wide range of air and water
temperatures, it will provide the best performance
if not subject to extremes.
Air Temperature Limitations
o
• Maximum: 100
F or 38o C
• Minimum: 50o F or 10o C
Water Temperature Limitations
• Maximum: 100o F or 38o C
• Minimum: 40o F or 4.4o C
Water Pressure, Potable
• Maximum: 80 PSI or 5.5 BAR
• Minimum: 20 PSI or 1.3 BAR
Water Pressure, Condenser inlet
• Maximum: 145 PSI or 10 BAR
• Minimum: 20 PSI or 1.3 BAR; can be as low
as 5 PSI or 0.3 BAR if clean and supplied
with 45o F water.
Condenser GPM
• 70oF or 21oC water: 0.25 GPM or 0.95 LPM
• 50o F or 10oC water: 0.15 GPM or 0.57 LPM
Voltage
115 volt models
• Maximum 126 VAC
• Minimum 104 VAC
230 volt models
• Maximum 207 VAC
• Minimum 253 VAC
Water Conductivity:
Minimum:10 micro Siemens/CM
RO water may be supplied to the potable water
system, but if it has less than the above conductivity, the water level sensor will not detect water
and the unit will not make ice.
Deionized water is not recommended due to
it’s potential corrosive nature and any damage
caused by DI water will not be covered by warranty.
Operating the machine outside of any of the
above limitations is considered abuse and any
resulting damage is not covered by warranty and
could cause a complete loss of warranty coverage.
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.
Product Information:
The UF424 produces aked ice and the UN324
produces nugget ice. The ice is stored in an
insulated bin with ice level automatically maintained by the control system.
• A back ow preventer may be required by
local plumbing codes.
• Has a 5.5 ft. power cord with NEMA 5-15P
plug.
• Air cooled models ows in the right front and
out the left front and include a cleanable air
lter.
• Legs are provided, thread size is 5/8-11.
• Machine may be installed without legs.
• For available options and kits, see sales
literature.
Electrical
Model
(Volts/Hz/Phase)
UF424A-1A / UN324A-1A 115/60/1 Air 15A
UF424W-1A / UN324W-1A 115/60/1 Water 15A
Condenser
Maximum Fuse Size
October 2017
3
or Breaker
(Amps)
UF424 / UN324 Installation and User Manual
Cabinet Drawing
Scotsman Ice Systems are designed and manufactured with the highest regard for safety and perfor-
mance. They meet or exceed UL563, veried by Intertek, ETL.
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UF424 / UN324 Installation and User Manual
Placement
The location of the equipment should be selected
with care. Consideration should be given to allow
adequate space for air cooled models to breathe.
The ice machine is not designed for outdoor
use. It must be installed indoors, in a controlled
environment. The air and water temperatures
must not exceed rated limits.
Scotsman assumes no liability or responsibility of
any kind from products manufactured by Scotsman that have been altered in any way, including
the use of any part and/or other components not
specically approved by Scotsman.
Scotsman reserves the right to make design
changes and/or improvements at any time.
Specications and design are subject to change
without notice.
Airow on air cooled models:
Intake from the right grill
Exhaust from the left grill
Do not install where this air ow is blocked.
3. Remove bolts holding machine to pallet.
4. Install the legs. The legs are to be screwed
into the same holes the shipping bolts were
removed.
5. Remove the protective plastic covering the
panels. The longer it is left on the panel, the
more difcult it will be to remove it.
Spacing:
No additional spacing is required at the top or
sides. However, suggested minimum side clearance for the installation is 1/8’’ or 3.2 mm and
suggested minimum top clearance is 1/4” or 6.4
mm.
The machine may be installed with 0 clearance at
the back. Do not block louvers at the front of the
cabinet.
Pre Installation:
Water supplied to the ice machine should be
ltered. Install a lter system that lters out
suspended solids. It may be necessary to add a
coarse pre-lter ahead of the ne lter.
The power outlet should be located within the
length of the supplied power cord. If legs will be
used, allow space for the total cabinet height.
Air cooled models in a small room will require
ventilation to exhaust heat from the condenser.
The condenser fan and motor will generate some
noise while the machine is running. Noise sensitive areas should consider water cooled equipment or locate the machine where the noise from
ice making will not objectionable.
Unpack
1. Separate the carton from the shipping
pallet
2. Inspect for any hidden shipping damage. If
any is found, retain carton and notify carrier
for potential claim. Shipping damage is not
covered by warranty.
Caution: Tip Over hazard to prevent injury or
damage to the machine please use caution when
lifting the unit. It will easily tips to the rear.
August 2017
Inspect the place where the ice machine is to be
installed. Check for:
• Space for the cabinet
• Water Supply
• Drain Availability
• Electrical Power Supply
DO NOT USE EXTENSION CORDS.
The building drain inlet must be lower than the
drain outlets at the back of the ice machine.
The water supply must have a hand shut off valve
accessible when the unit is installed.
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UF424 / UN324 Installation and User Manual
Installation: Water and Drain
For the Plumber
1. Connect cold potable water to the 3/8’’
male are behind the lower back panel.
A water lter is recommended. Flush the
water line prior to connecting to the ice
machine.
A loop of copper tubing may be used between the
ice machine and the water supply. This will allow
the ice machine to be pulled out from its installed
location without disconnecting water. No back
ow preventer is required in the potable water
line. This is provided by the reservoir seat, which
is above the reservoir water level and cannot be
siphoned
2. Connect a drain tube to the drain tting.
Drain tubes for a water cooled machine
should be run separately. The bin drain
tting is 3/4’’ FPT. And it is plastic. Do not
overheat.
• Drain tube material must be rigid and
meet local code.
• Traps in the bin drain line without vents
ahead of them will cause poor draining
• The bin drain must be vented if there
is a long horizontal run 5 feet or more.
All drains are gravity and must have a
minimum fall of 1/4’’ per foot of horizontal run.
• Maintain the air gap required by local
code between the end of the drain to,
and the building drain receptacle.
• Drain tubing should be insulated to
prevent condensation from forming on
the tubing.
For the Electrician
This is a cord-connected unit and must be on a
separate single phase power supply. Check the
name plate for the correct voltage. The maximum fuse size for this circuit should be 15 A, per
the nameplate use fuses or HACR circuit breaker.
Follow all local codes. This unit must be
grounded. Do not use extension cords and
do not disable or bypass the ground pin on
electrical plug.
After utility connections
1. Level the cabinet, use the leg levelers
on the end of the legs to adjust to cabinet
height. Legs should have been installed
when the unit was unpacked.
2. Wash the bin and hood. If desired, the
interior of the bin could be sanitized.
3. Locate the scoop, wash it and have it
available for use when needed.
3. Water cooled models have a separate 3/8”
FPT tting for condenser water inlet. DO
NOT FILTER water to this connection. The
condenser drain is1/2’’ FPT and does not
need a vent.
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UF424 / UN324 Installation and User Manual
Initial Start up
Final check list:
Ice machine is installed indoors with air
and water temperature controlled within
the limitations detailed in this manual
Ice machine is level in its nal position
Electrical disconnect (switch or plug as
required) is within sight of the installed
machine
Electrical circuit is dedicated to this ice
maker
Voltage has been conrmed within the
specications in this manual and the
name plate on the ice maker
Plumbing connections are complete
and tested for leaks
Ice maker is installed with proper clear-
ance, allowing for service and utility
connections
Water shut off valve installed near the
ice maker
cooled models will discharge warm (about
1200F/480C) water out of the condenser
drain. In a few minutes, ice will begin to
fall into the bin.
6. Push the on/off button to switch the machine off. Scoop out any ice in the bin.
7. Create a solution of sanitizer. Mix
4oz/118ml of NuCalgon IMS III and
2.5gal/9.5L of (900F/320C to 1100F/430C)
potable water to create a 200 ppm solution.
8. Sanitize bin by wiping all surface areas
with the sanitizer solution. Allow to air dry.
9. Turn the ice maker on by pressing the on
button.
10. Replace inner panel, front cover and louvered panel.
11. Give the owner/user this manual, instruct
him/her in the operation and maintenance
requirements of the unit. Make sure they
know who to call for service.
Fill out the Customer Evaluation and Warranty
Registration form, and mail it in to Scotsman
or register the unit at Scotsman’s website
(www.scotsman-ice.com).
Start up:
1. Remove louvered front panel.
2. Open bin door and remove the inner panel,
held in place by 4 thumb screws.
3. Open the water valve. Observe that water
enters the water reservoir, lls and then
shuts off. Check for leaks. Repair any leaks
before going further.
4. Switch electrical supply on. Lights on con-
troller will ash and then the power light will
remain on. The code display will show O.
5. Push and release the On/Off button. The
machine will start the ice making process. The code display will show F. Air
cooled models will discharge warm air
out the left side of the front panel. Water
Once started, the ice machine will automatically
make ice until the bin level sensors are blocked.
This will happen once the ice pile up to the sensors. The typical ice level when the machine is off
will be several inches below the door. When ice
level drops from use or meltage, the ice machine
will resume making ice.
Tip: To maximize ice storage scoop the ice to the
sides of the bin.
Noise:
This is a commercial ice machine. It contains a
powerful compressor, heavy duty gear reducer and, if air cooled, a fan motor. It will produce
some noise when it is making ice. Every effort
was made during its design to minimize the
sound level but some is unavoidable.
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UF424 / UN324 Installation and User Manual
Maintenance and Cleaning
There are 4 areas of maintenance
1. Ice making system
2. Photo eye ice level control system
3. Bin
4. Air cooled condenser and lters
Ice making System:
Remove Scale
1. Remove front panel.
2. Turn the machine off by pressing the on /
off button.
3. Empty the ice from the storage bin
4. Remove the inner panel using the 4 thumb
screws.
5. Remove the top cover from the reservoir.
6. Shut water supply off at the reservoir by
turning the knob counterclockwise.
7. Locate the evaporator drain in the ice
machine compartment. Unplug it and drain
the evaporator.
8. Replug the drain.
9. Mix a solution of 1.5qt/1.4L of warm water
(900F/320C to 1100F/430C) and 4 ounces
of Scotsman Clear 1 Ice Machine Scale
Remover.
10. Pour the cleaning solution into the reser-
voir until it is full (a squirt bottle may be
necessary to ll reservoir with cleaning
solution).
11. Push the clean button. the machine will
operate the auger motor for approximately
20 minutes. Then it will start making ice
with the cleaning solution.
12. Add remaining cleaning solution to the
reservoir as ice is being made for the next
20 minutes. After the full 40 minutes (steps
11 & 12) the unit turn off.
13. Drain the solution from the reservoir by
removing the plug. Once drained, replace
the plug.
14. Pour clean water into the bin to melt any
ice produced during the cleaning cycle.
15. Mix a solution of 4oz/118ml of Scotsman
Clear 1 ice machine scale remover and
16oz/473ml of potable water. Use this
scale remover solution for the water reservoir cover, ice discharge chutes, the stor-
age bin and the inner front cover.
Sanitize Water System
16. Create a solution of sanitizer. Mix
4oz/118ml of NuCalgon IMS III and
2.5gal/9.5L of (900F/320C to 1100F/430C )
potable water to create a 200 ppm solution.
17. Pour the sanitizing solution into the reservoir until it is full and wait 2 minutes.
18. Turn on the water supply and press the
ON /Off button to turn the ice machine on
19. Operate the machine for at least 15 minutes.
20. Drain the solution from the system by pulling the reservoir plug from the drain hose.
Return plug when drained.
Photo Eye ice level control
1. Mix solution of 4 ounces of Clear 1 Ice
Machine Scale Remover and 1.5qt/1.4L of
900F/320C to 1100F/430C water.
2. Remove sensors from inner cover by removing the white c-clip .
3. Use cotton swab and cleaning solution to
thoroughly clean photo sensors.
4. Rinse sensors with clean water.
5. Reinstall sensors in inner panel.
Ice machine cleaner contains
acids. Acids can cause burns.
If concentrated cleaner comes
in contact with skin, ush 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.
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UF424 / UN324 Installation and User Manual
Bin
1. Use the same cleaning mixture to thoroughly clean bin surfaces.
2. Rinse with clean water.
3. Use sanitizer mix on all bin surface areas
and areas that may contact the ice.
4. Rinse with clean water.
Filters and Air Cooled Condenser
The air lter located on the lower front grill will
capture airborne dust during operation. As the
dirt builds up, it begins to restrict air ow and
causes the refrigeration system to work less efciently. Clean the air lter regularly.
1. Remove the lter by sliding it to the right
until it is clear of the ice machine.
2. Remove dust and dirt by washing the lter
in a utility sink.
3. Reinstall lter in the ice machine.
Condenser
The condenser ns require semi annual cleaning.
Use caution to prevent damage to the condenser
ns.
1. Lightly brush dust from the condenser.
2. Use a vacuum to thoroughly clean the
condenser.
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UF424 / UN324 Installation and User Manual
Basic Troubleshooting
Troubleshooting
Symptom Possible Cause Probable Correction
No ice in bin Unit in off mode or off on
error code.
No Power to unit Check for the power light on the controller. If not
Auger motor not operating Open windings. Check motor windings and replace
Compressor not operating Contactor coil is open, check and replace if needed.
Compressor operating,
auger turning, no ice is
made
Excessive noise Tubing contact Check for tubes rattling and panels not tight
Fan blade out of balance Replace fan blade
Compressor noisy Replace compressor
Moaning noise when
making ice
Slow or Low production Condenser is dirty Check and clean condenser
Water seal being
compressed
Room and/or Water
Temperature too high
Restricted air ow to unit Check and remove air ow restrictions
Remove front panel and check controller code
display. Push ON/OFF button to reset
illuminated restore power.
if open.
Gear reducer seized, replace gear reducer.
Auger bearings seized, replace bearings and seal
No power to auger motor, Auger light is ON.
Replace controller.
Code 2 in controller. Check that sensor rotates with
motor and isn’t loose. Tighten screw if loose.
Code 1 in controller, replace auger motor.
Compressor hot and overheated, check start relay
and start capacitor
No power to compressor or contactor coil.
Compressor light is ON. Replace controller.
Compressor at room temperature, will not start.
Check windings. If open, replace compressor. If not
open, check/replace start relay and start capacitor.
Check refrigeration system, TXV may be set to too
much superheat or the system is low on refrigerant.
Gear reducer bearing failure, replace gear reducer
Maximum production will be achieved at 70°F / 21°C
air and 50° / 10°C water
August 2017
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UF424 / UN324 Installation and User Manual
Controller Diagnostics
Code or Light Action Probable Cause Suggested Action
O
F
b
E
C
d
1
2
3
4
Status light is on Unit is in ice making mode Normal, may not be making ice if
Time to Clean light is on Unit has not been cleaned for at
Unit manually switched off If desired, switch unit on.
Freeze mode None, unit is making ice.
Bin sensors sense bin full Check if bin is full.
Corrupted memory Replace controller
Clean mode Continue clean mode
Test mode None, allow unit to nish test
mode.
Auger motor rotated auger
backwards.
Auger motor stalled or operating
slowly
No water in reservoir Restore water. If there is water,
High pressure cut out open Check fan motor on air cooled or
least 6 months
Replace auger motor. Check water
seal area for leaks, replace seal if
leaking.
Clean ice making system and retry.
If unit shuts off again right after a
reset, magnet rotor on motor shaft
may be loose.
is it too pure? Are sensor wires
connected?
water supply on water cooled.
bin is full
Clean unit
Auger light is on Auger motor is active Normal when making ice
Compressor light is on Compressor is active Normal when making ice
August 2017
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SCOTSMAN ICE SYSTEMS
101 Corporate Woods Parkway
Vernon Hills, IL 60061
800-726-8762
17-3627-01 Rev.A
Last Revised July 2018
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