SLE400
Introduction
To the owner or user: This service manual is
intended to provide you, and the maintenance or
service technician, with the information needed to
install, start up, clean, maintain and repair this
product.
The SLE400 is an ice machine that produces
cubed ice on 6 vertical cube freezing surfaces.
When harvested, the cubes fall individually into the
ice storage bin. The SLE400 automatically
maintains the level of ice by turning on when the
ice level falls, and switches off when the bin is full.
The refrigeration system uses R-404A as the
refrigerant.
Table of Contents
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 2
Limitations
page 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 5
SLD dispenser . . . . . . . . . . . . . . . . . . . . . . . . . .
page 6
RS or IS dispenser . . . . . . . . . . . . . . . . . . . . . . . .
page 7
Plumbing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 8
Electrical
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 9
Bin
Final Check List
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location
page 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 11
Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 12
Electrical Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 14
Water/ Refrigeration Schematic . . . . . . . . . . . . . . . . . . . . . . . . .
page 16
Technical Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . .
page 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page 19
Cleaning
Service Diagnosis
Removal and Replacement
. . . . . . . . . . . . . . . . . . . . . . . . . .
Parts lists and wiring diagrams are located in the center of this manual, printed on yellow paper.
Note the warning symbol where it appears in this
manual. It is an alert for important safety
information on a hazard that might cause serious
injury.
Keep this manual for future reference.
This manual was printed on recycled paper.
January 1995
Page 1
page 22
SLE400
Specifications
Information regarding Model Number, Serial
Number, Ampacity and Maximum Fuse Size are
located on the nameplate of the ice machine. The
model number, serial number and refrigerant
charge are also listed on
the serial number plate
just behind the front
panel.
Nameplate
Serial Number
Plate
If recharging, always
use the charge listed on
the ice machine.
SLE400 Cabinet
3 3⁄4"
SLE400 Back View
(Air Cooled Model Shown)
1 3⁄8"
Water
Inlet
Electrical
Inlet
20"
4 1⁄4"
Specifications:
The SLE400 will stack onto a
variety of ice storage bins, see
sales literature for proper ice
storage bin.
Model Number
Dimensions
W" x D" x H"
SLE400AS-1A 22 x 23 x 20
SLE400WS-1A 22 x 23 x 20
7⁄ "
8
22"
Drain
Condenser
Basic
Minimum
Type
Electrical Circuit
Ampacity*
Air
Water
115/60/1
115/60/1
* Minimum Circuit Ampacity is used to determine
wire size and type per the National Electric Code.
January 1995
Page 2
22.3
18
Maximum
Refrigerant
Fuse Size (or
Charge.
HACR circuit
R-404A
breakers)
25
19 ounces
20
18 ounces
SLE400
For The Installer: Environmental Limitations
The ice machine must be installed indoors in a
controlled environment.
Minimum
Maximum
0
Air Temp
55 F.
1000F.
Water Temp
400F.
900F.
Water Pressure 20 PSI
60 PSI
Voltage
126.5
103.5
Operating the ice machine outside of the above
limitations, or outdoors, is potentially damaging to
the machine, and it is misuse of the machine. This
may 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 CSA.
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.
Airflow on air cooled models is:
• Intake through the right side grill.
• Exhaust through the back.
SLE400
Top View
Dashed Lines Show
Outline of Ice Drop
Area.
Bin Control Mounts to
Right of Ice Drop Area.
12"
23"
7"
3"
6 1⁄2"
6" Space Required for
Air Flow (Air Cooled
Only) and Utility
Connections
Do not install where this air flow is obstructed.
January 1995
Page 3
SLE400
Installation
Water
Location
The water supply for this ice machine has been in
contact with many materials since it fell from the
sky as rain. All rain is slightly acidic, and tends to
dissolve the materials it comes in contact with.
During water’s journey to the ice machine, it has
flowed over and through the ground, been picked
up by a municipal or private pump, forced through
a series of pipes of differing construction and may
have been treated by the municipality providing
the water.
This ice machine may be installed in the open or
under a counter. Clearance may be required at the
sides, and is required at the back. Air cooled
models take air in from the right and blow it out the
back. Space is required for utility connections at
the back.
The water supplied to this ice machine will then
contain a variety of substances that will likely show
up as solids during the ice making process. These
solids are similar to those found when water is
boiled out of a saucepan. Only the water boils
away, and the minerals that were in the water
solidify in the pan. During ice making only the
water is frozen into ice, the minerals stay behind in
the reservoir. This machine drains out some water
in the reservoir every cycle to minimize the amount
of minerals in the water system, but after time the
minerals will appear and have to be dissolved by
ice machine cleaner, then flushed away during the
cleaning process.
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.
Pre-installation:
1. Inspect the place where the ice machine is to be
installed. Check for:
• space for the cabinet,
• water supply,
• drain availability
• and electrical power supply.
No extension cords are allowed. The building drain
inlet must be lower than the drain outlet of the ice
bin. The water supply must have a hand shut off
valve accessible when the unit is installed.
An ice machine is a food manufacturing plant; it
takes a raw material, in this case water, and
transforms it into a food product, ice. The purity of
the water is very important in obtaining pure ice
and in maximizing product life.
The water to the ice machine should be filtered.
Water filters vary greatly in ability and function.
Install one that filters out suspended solids to a
dimension of 5 microns or less. The finer the filter
the better, but finer filters may plug-up sooner than
course ones. It may be necessary to add a course
filter ahead of the fine filter to prolong filter life.
Polyphosphate feeders are usually effective in
many water conditions.
Have the water tested. Acidic water or alkaline
water will both cause corrosion. Dissolved solids
cannot be filtered out. Softened water is not
recommended. Never use de-ionized water.
Reverse-osmosis water must be treated with
buffering agents before use in the ice machine.
Check with a water treatment specialist regarding
testing, treatment and filters.
January 1995
Page 4
SLE400
Installation: Ice Storage Bin
Assembly:
Stacking:
1. Attach the legs, or optional casters, onto the ice
storage bin. Units that are stacked should only use
legs, not casters.
This machine will stack onto any SLC300 or
SLE400. Note: Do not use casters when stacking.
2. Be sure that the top edge of the bin has a good
gasket on it.
3. Place the ice machine onto the storage bin.
4. Line up the ice machine, check that there is a
good seal between the ice machine and the
storage bin.
5. If on a Scotsman bin, attach the ice machine to
the bin using the straps and bolts shipped with the
ice machine. Drill two 1/8" holes in the back of the
bin and secure with sheet metal screws provided.
If on another brand bin, follow the directions
included with that bin.
1. Remove and discard the left top panel from the
lower unit.
2. Remove knock out plug from top right panel.
3. Place gasket material around the top of the
bottom unit’s cabinet & evaporator compartment.
4. Carefully lift the uncrated top unit onto the
bottom unit. Use of a mechanical lift is
recommended for this step.
5. Align the two ice maker cabinets.
6. Secure the top unit to the bottom one with the
hardware and straps shipped with the upper
machine.
7. Locate and uncoil all of the bin thermostat
capillary tube.
Bin Thermostat Installation:
1. Remove thermostat bracket from package.
2. Attach the bin thermostat bracket to the bottom
of the ice machine using the thumb screws
provided. There are pre-drilled and tapped holes
located just to the right of the cube drop area.
8. Route the bin thermostat capillary tube from the
upper unit, through the hole in the base, through
the lower unit and into the bin thermostat bracket.
Discard upper unit bracket.
Bin Thermostat
Installation
Stacking
Routing Hole
Bin Thermostat
Bracket
Capillary Tube
Fasten Cabinets
Together At Back
With Straps &
Screws.
Bin Thermostat
Bracket
Thermostat
Capillary Tube
3. Locate and uncoil a portion of the
bin thermostat capillary tube. Route
the end of the capillary tube into the
plastic tube in the base of the ice
machine (next to the compressor) and
through the bin thermostat bracket.
Note: SLB150: Use thermostat
bracket packed with that bin.
January 1995
Page 5
SLE400
Installation: SLD150 Hotel Dispenser
Assembly
The ice machine must be placed onto the top of
the dispenser, and the bin thermostat capillary
tube routed into the bracket in the dispenser.
1. Check that the dispenser has a gasket all
around the perimeter of the top, 22" wide by 23"
deep.
2. Locate the inlet hole of the thermostat bracket,
and make sure that it is open.
3. Place a corner post from the ice machine carton
at the front of left and right sides of the hotel
dispenser top.
4. Use a mechanical lift and place the ice machine
onto the dispenser. The cardboard corner posts
should keep the front edge of the ice machine up.
5. Remove the front panel of the ice machine.
6. Locate the bin thermostat capillary tube and
uncoil about 18" of tubing.
7. Locate plastic tube in base of ice
machine, next to compressor and
push the end of the capillary tube thru
the tube, watch the capillary as it
comes out of the base, line it up with
the inlet hole of the thermostat
bracket and push it into the hole.
Move the cabinet of the ice machine
until the capillary tube is going
straight down into the inlet hole.
Bin Thermostat Capillary
Tube Installation
Route Capillary Tube
Through Plastic
Tube In Base
8. Carefully remove the corner posts.
9. Push the capillary tube into the
thermostat bracket tube until about
14" of capillary tube is in the tube.
9 Remove the hardware package
from the machine, remove brackets.
10. At the back of the dispenser,
fasten brackets to the ice machine.
11. Using brackets for templates, drill
1/8" holes into the back of the
dispenser.
Bin Thermostat
Bracket Mounted In
Dispenser
12. Secure brackets to the dispenser
with sheet metal screws from the
hardware package.
13. Follow other installation
instructions from the SLD150.
January 1995
Page 6
Temporarily
Support Machine
With Corner Posts
To Observe Cap
Tube Installation
SLE400
Installation: Scotsman IS or RS Dispenser
Assembly:
The assembly of the ice machine onto the
dispenser requires two additional parts: an adapter
kit and a thermostat stand off kit.
1. Mark two spots on the inside left liner of the
dispenser: 2" down from the top, 4" from the back,
and 4" apart.
7. From the adapter kit, place the stainless steel
adapter onto the top of the dispenser. Follow all
directions included with the kit.
8. After the ice machine has been placed on the
dispenser, remove the front panel and uncoil all of
the bin thermostat capillary tube.
2. At the two marked spots, drill two 1/4" holes thru
the plastic liner only.
9. Route the capillary tube thru the front hole in the
base of the ice machine, to the left side if the
dispenser towards the stand offs.
3. From the stand off kit, locate the stand offs and
plastic anchors. Thread the stand offs partially into
the plastic anchors.
10. Route the end of the capillary tube thru the
stand offs, bend the tube around the stand offs so
that it does not fall off.
4. Push the anchors/stand offs into the holes.
11. Check that the routing of the capillary tube is
away from the ice chute and up high near the base
of the ice machine.
5. Screw the stand offs all the way into the
anchors. Be sure that the holes in the stand offs
are horizontal.
6. Place a bead of silastic (from the kit) around the
stand offs.
Installation of Bin Thermostat
Capillary Tube
Route Capillary
Tube Through Front
Plastic Tube
K1 Kit Adapter
RS or IS
Dispenser
Stand Offs From Kit K6
Drill 2 Holes For
Stand-Offs:
2" From Top Of
Dispenser &
4" From Back &
4" Apart
Route Capillary
Tube Through
Stand Offs
January 1995
Page 7
SLE400
Installation
For The Plumber
Supply:
Screw the 3/8" male flare (fitting shipped in
package inside cabinet) into the 1/4" FPT fitting at
the back of the cabinet (thread tape
recommended). Connect cold potable water to the
water inlet. A hand shut off valve for inlet water
should be installed near the machine. A water filter
is recommended. Flush the water line prior to
connecting to the ice machine.
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’ or more). The reservoir drain
must be vented and not connected to the bin
drain. All drains are gravity, and must have a
minimum fall of 1/4" per foot of horizontal run.
Water Cooled: The water cooled condenser drain
is not vented, and is routed separately.
If water cooled, connect a separate water inlet line
to the water cooled condenser inlet fitting. It should
also have a hand shut off valve.
Maintain the air gap required by local code
between the end of the drain tubes and the
building drain receptacle.
Drains:
Note: Drain tubing should be insulated to prevent
condensation from forming on the tubing.
Connect a drain tube to the reservoir drain fitting at
the back of the cabinet. The drain tube from the
fitting must be run separately from any other drain
tube. The reservoir drain is a 3/4" F.P.T. brass
fitting.
CONFORM TO ALL LOCAL CODES
Drain tube material must be rigid and meet local
code.
3/8" FPT Inlet
Water Cooled
Condenser Plumbing
Connections
3/8 Male Flare
Water Inlet
Water Shut
Off Valve
1/2" FPT
Outlet
Reservoir Drain
3/4" FPT, Must Be Vented.
Ice Storage Bin
(Typical)
Bin Drain. May Be Routed From
The Bottom On Some Model
Bins. Fitting May Be Plastic.
DO NOT OVERHEAT.
Water Supply and Drain Connections
January 1995
Page 8
SLE400
Installation
For The Electrician
This unit must be on a separate 115 volt AC 60
cycle single phase power supply. The maximum
fuse size for this circuit is listed on the nameplate,
and per the nameplate use fuses, or HACR circuit
breakers.
Follow All Local Codes - This Unit Must Be
Grounded. Usually a licensed electrician will be
required to connect the electrical service.
To make the electrical connections:
1. Remove the right top panel.
2. Remove the junction box cover.
3. Make the electrical connections to the wires in
the junction box. A ground screw is provided in the
junction box.
Hand Disconnect Switch
Junction Box
January 1995
Page 9
SLE400
After Utility Connections
1. Level the cabinet, use the leg levelers on the
end of the legs to adjust the cabinet height. (Legs
should have been installed when the bin was
unpacked).
2. Wash out the bin. If desired, the interior of the
bin could be sanitized.
Final Check List
1. Is the ice maker cabinet in a room where
ambient temperatures are within the minimum and
maximum temperatures specified?
2. Has the water supply been connected?
3. Is the water pressure adequate?
4. Have the water connections been checked for
water leaks?
5. Have the drain connections been made?
6. Have the drain connections been checked for
leaks?
7. Is the cabinet level?
8. Is the ice machine connected to a 115 volt
electrical power supply and is the ice machine the
only load on that circuit?
9. Has all of the shipping material been removed
from the inside of the cabinet?
10. Has the bin and cabinet been wiped clean and
sanitized?
11. Has the Customer Evaluation & Warranty
Registration form been properly filled out? Check
for correct model and serial numbers from the
nameplate, then mail the completed form to
Scotsman.
12. Has the owner/user been given the name and
telephone number of the authorized Scotsman
Service Agency serving that location?
January 1995
Page 10
SLE400
Component Location
Many components are serviceable from the front
without removing the side panels.
Control Box Detail
Behind the front panel:
• Water pump
• Inlet water valve
• Reservoir
• Evaporators
• Water distributor pan
• Ice size control adjustment
• ICE/OFF/WASH switch
• Control box
Ice Size
Thermostat
Contactor
High
Pressure
Cut Out
Compressor
Relay
Harvest
Relay
Bin
Thermostat
Ice/Off/Wash
Switch
Ice Thickness Control
Control Box
Water Distributor
Pan
Bin Thermostat
ICE/OFF/WASH Switch
Bin Thermostat
Bracket
Water Pump
Water Inlet Valve
Drain Elbow
Component Location
January 1995
Page 11
SLE400
Initial Start Up
After the final check list has been gone through,
the ice machine may be started up.
Ice Size Adjustment
1. Open the water shut off valve; the inlet water
valve will open, and water will flow into the
reservoir..
2. Switch on the electrical power.
3. Remove the front panel.
3. Locate the ICE/OFF/WASH switch,
switch it to WASH.
Ice Thickness Probe
Adjustment Plate:
Move UP for Larger
Cubes,
DOWN for Smaller
Cubes
Set
Screws
4. The water pump will begin to pump
water over the evaporators.
5. Allow the reservoir to refill. Normal water level is
1/8" below the high point of the lower curve of the
siphon u-tube.
Cube Size Diagram
6. Switch the ICE/OFF/WASH switch to OFF.
7. Check the action of the siphon. The water level
in the reservoir should drop to the bottom curve of
the U-bend (normal water level) in about 2
minutes. If not, check for proper drain tube
connections.
Cubes Too
Thick
8. Switch the ICE/OFF/WASH switch to ON.
9. On air cooled models the fan motor will begin to
turn, and warm air will be discharged from the
back of the ice machine.
On water cooled models warm water will begin to
flow from the condenser drain.
10. The water temperature in the reservoir will
soon be 320F., and ice should begin to form on the
evaporators.
11. Allow the ice machine to operate for about
15-20 minutes. The ice should be fully formed and
should be harvested within a few minutes.
Correct Size &
Shape
12. After harvest, check the ice cube size.
Compare a fresh cube to the diagram on the
back of the front panel. If needed, adjust the
cube size by loosening the set screws and moving
the ice thickness probe adjustment plate.
Move the adjustment plate down for smaller
cubes and up down for larger.
For proper operation, the ice thickness should be
set to the 1 11 ⁄16" diameter.
The machine is designed to harvest cubes of
only the correct thickness.
January 1995
Page 12
Cubes Too
Thin
1 11⁄16"
SLE400
Initial Start Up
Note: If the first batch of cubes are not all uniform
discs, some ice machine cleaner should be added
to the reservoir.
1. After ice has been harvested, but before new
cubes begin to form, switch the ICE/OFF/WASH
switch to WASH.
2. Add 4 oz. of ice machine cleaner to the
reservoir. Allow unit to operate that way for 10
minutes.
3. Switch ICE/OFF/WASH switch to OFF
4. Shut the water supply off.
5. Remove the splash guard, and drain the
reservoir by removing the drain elbow.
7. Replace all parts, turn on the water and move
ICE/OFF/WASH switch to ICE. The next batch
of ice should be uniform.
13. Check harvest. The machine will have to
harvest all of the cubes before it goes back into the
freeze cycle.
14. Check operation of the bin control circuit by
holding ice on the bin control tube in the bin.
If the ice maker does not stop within 1 minute,
while keeping ice on the thermostat, rotate the bin
thermostat shaft counter clockwise until the ice
maker does stop. Remove the ice from the
capillary tube; the ice maker should restart within 2
minutes. If it does not, rotate the adjusting shaft
clockwise until the machine starts.
15. Replace all the panels. The ice machine is now
ready for automatic operation.
Siphon Tube Schematic
U-Tube Adjusted
Here = No Purge
Electrical Sequence:
Freeze Cycle:
During the first part of the freeze cycle, the ice
machine compressor, fan motor if air cooled, and
water pump are operating.
Assume the bin thermostat is open (low ice), relay
K1 will NOT have power thru its coil and K1
contacts 6-2 will be closed, connecting power to
the ice size thermostat.
The ice size thermostat contact 2-3 are closed,
connecting power to the fan and pump motors.
The Harvest Termination Thermostat is closed to
NC, but there is no power thru it.
The ice size thermostat heater is on, and the
compressor contactor coil is energized.
Harvest:
In the harvest cycle, the compressor is operating,
and the hot gas valve is energized. The water
pump is off, and air cooled models switch the fan
off.The bin thermostat is still open.
When the ice near the ice size thermostat sensing
tube grows large enough to force water over the
sensing tube, that tube looses heat, and at 38oF.
contacts 2-3 open and 2-1 close.
This removes power from the water pump and fan
and connects power to the relay coil. When the
relay coil has power, it connects power to the:
• Hot gas valve coil
The harvest termination switch is closed, and
power flows thru it to the relay coil. This keeps the
relay energized, even when the ice size thermostat
switches contact position as a result of ice falling
away from the sensing tube.
The unit stays in the harvest cycle until the
thermodisc on the suction line warms up to 55oF.,
U-Tube Here =
at that time the defrost thermodisk switches to NO
Maximum Purge
and the harvest cycle is terminated. If the bin
Water Level
thermostat is still open, relay K1 will still not have
At Harvest
power and the unit will go back into the freeze
Water Level With cycle. If relay K1 has power, it shuts off the ice
Pump ON
machine by cutting power to the ice size
thermostat. The ice size thermostat heater is on.
Water Inlet
Siphon Breaker Hole
1/8 - 1/4
Drain Outlet
Elbow
Whenever there is ice on the bin thermostat, it
closes a circuit to the coil of relay K1 and stops the
ice making process at the end of a harvest cycle.
Bottom of
Reservoir
January 1995
Page 13
SLE400
Maintenance, Cleaning and Sanitizing
Cleaning Schedule:
• Scrub the outside of the cabinet once a week
with soap and water.
• Sanitize the bin interior once a month.
• Clean the water system and air cooled
condenser a minimum of twice per year. If in an
area of high mineral concentration in the water
supply, clean water system 4 times a year.
Air Cooled Condenser (air cooled only):
Ice Storage Bin
The interior liner of the bin is in contact with a food
product: ice. The storage bin must be cleaned
regularly to maintain a sanitary environment.
Once a week cleaning with soap and water, a hot
water rinse and an air dry is a basic procedure.
Every 30 days, the liner should be sanitized with a
commercial ice machine sanitizer, according to the
directions of the sanitizer, or with a solution of
household bleach and water:
Remove the right side panel.
1. Mix the bleach and water using the ratio of two
ounces of bleach to two gallons of water.
The air flow thru the condenser is from front to
back, so dust will build up on the fan side of the
condenser fins.
2. Wipe all interior surfaces of the ice storage bin
with the bleach and water.
The fan motor, bracket and part of the shroud may
be removed as an assembly.
To Remove Scale:
3. Allow to air dry.
1. Mix a cleaning solution of 4 ounces of Scotsman
Ice Machine Cleaner to 4 pints of warm
(950F.-1100F.) water.
1. Shut the unit off.
2. Remove the right side panel.
3. Unplug the fan motor.
4. Remove three screws at right edge of shroud.
5. Pull shroud and fan out as an assembly, the
inside fins of the condenser are now visible for
cleaning.
2. Using rubber gloves, dip a nylon scouring pad
into the cleaning solution and scrub the scale off
the liner.
3. After the scale has been removed, rinse all
surfaces inside the bin with clean, potable water.
The fins of the condenser will become fouled with
dirt, and must be cleaned. A vacuum cleaner with
a soft brush attachment will extract most loose
dust stuck to the surface of the condenser fins..
Water Cooled units:
The water cooled condenser may, over time and
under certain water conditions, become internally
restricted by minerals. These will have to be
dissolved by acid or the condenser replaced. Only
a qualified service agent should attempt this type
of service.
Stainless Steel Bin Liner
The stainless steel liner of the bin will require
periodic cleaning. Chemicals in the water supply,
such as chlorine, cause brown stains to appear on
the surface of the stainless steel parts.
1. General Cleaning - staining is usually removed
by washing the parts with ordinary cleaning
powder such as Bon-Ami or Copper-Glo and
water. After cleaning, rinse with clear water.
2. Water treatment. The chlorine enters the
machine from the municipal water supply. It can be
removed from the water supply by using a
charcoal or activated carbon water filter to treat the
water to the ice machine. If staining is severe,
filters of this type are recommended.
Exterior Cabinet Cleaning:
The exterior cabinet may be cleaned by scrubbing
with soap and water. Do not use cleaners
containing petroleum products.
A nylon type brush may be used to scrub stubborn
deposits.
January 1995
Page 14
SLE400
Cleaning: Ice Machine Water System
Dissolve and Remove Minerals:
1. Remove front panel.
15. Shut the water supply off.
2. Move the ICE/OFF/WASH switch to OFF.
3. Remove the splash guard.
16. Drain the water from the sump by removing the
drain elbow.
4. Shut the water supply off.
Sanitize:
5. Drain the water from the sump by removing the
drain elbow.
17. Remove the water distributor pan.
6. Disconnect hose from the water distributor pan,
and remove the water distributor pan.
7. Mix a solution of 5 oz. ice machine cleaner and
1 gallon of warm (95oF. - 115oF.) water.
Scotsman Ice Machine
Cleaner contains acids.
These compounds may
cause burns.
If swallowed, DO NOT
induce vomiting. Give
large amounts of water or
milk. Call Physician
immediately. In case of
external contact, flush
with water.
KEEP OUT OF THE
REACH OF CHILDREN.
18. Mix a sanitizer solution of 1 ounce of
household bleach to 2 gallons of warm (95oF. 115oF.) water
19. Wash the splash guard and the water
distributor pan with the solution of sanitizer. Allow
to air dry.
20. With the sanitizer solution, wash the
refrigeration tubing, liner, evaporators, support
brackets and water pump assembly; use the brush
and/or a clean cloth.
21. Replace the water distributor pan and splash
guard. Be certain that the hose to the water
distributor pan is tightly connected to the pan, and
that the flow washer in the hose is not in sideways.
22. Replace the drain elbow.
23. Add ice machine sanitizer solution to the sump
area until it is full.
8. Wash the splash guard, drain elbow and water
distributor pan with the ice machine cleaner/water
solution.
9. With the solution of ice machine cleaner and
water, wash the refrigeration tubing, liner,
evaporators, support brackets and the water pump
assembly. Use the brush and/or a clean cloth.
10. Replace the drain elbow.
11. Open the water supply and allow the sump to
refill.
12. Add 5 oz. ice machine cleaner to the sump
area.
24. Move the ICE/OFF/WASH switch to WASH
add more sanitizer solution to the sump area until
it is full again.
25. After 5 minutes, move the ICE/OFF/WASH
switch to OFF.
26. Remove the splash guard.
27. Drain the water from the sump by removing the
drain elbow.
28. Replace the drain elbow and splash guard
29. Open the water supply and allow the sump to
refill.
30. Move the ICE/OFF/WASH switch to ICE.
13. Replace the water distributor pan and splash
guard. Be certain the hose to water distributor pan
is connected to pan.
31. Replace the front panel.
32. Discard first batch of ice and all other batches
until all traces of cleaner and sanitizer disappear.
14. Move the ICE/OFF/WASH switch to wash and
allow the solution to circulate for 15 minutes, then
move the ICE/OFF/WASH switch to OFF.
17. Remove the splash guard.
January 1995
Page 15
SLE400
Refrigeration Schematic:
Freeze Cycle:
Water Schematic:
From the compressor, hot discharge gas is
pumped to the condenser, either air or water
cooled.
Water flows into the ice machine from its inlet
connection at the back of the cabinet, through the
inlet water valve and into the reservoir. The water
in the reservoir is pumped up and through the
water distributor tube at the top of the evaporators.
From there, the water flows over both sides of the
evaporators and back into the reservoir.
At the condenser, heat from the refrigerant flows
into the cooling medium, either air or water, and
the refrigerant condenses into a liquid. From the
condenser the liquid refrigerant flows through the
liquid line to the metering device - a thermostatic
expansion valve.
At the expansion valve, the liquid refrigerant
passes from a high pressure zone to one of
relatively low pressure, and in the low pressure
zone it evaporates. The low pressure zone where
the refrigerant evaporates is the evaporator. When
the refrigerant evaporates, it absorbs heat from the
metal parts of the evaporator and the water flowing
over it.
Melted ice and water spills into the bin flow
through a drain in the base of the bin to the
exterior drain connection at the back of the cabinet.
From the evaporator, the refrigerant flows back to
the compressor through the suction line.
Water Distribution
System
Hot Gas Valve (Closed)
Discharge Line
Thermostatic
Expansion Valve
Condenser
Evaporators
Inlet
Water
Valve
Suction Line
Compressor
Water
Pump
(On)
Fan Motor
(On)
Dryer
Float
Valve
Refrigeration Schematic
Water Reservoir
Siphon
Tube
January 1995
Page 16
SLE400
Harvest Cycle:
During the Harvest Cycle, the water level rises,
filling the reservoir over the siphon tube and
siphoning some of the reservoir water out to the
drain.
The ice maker continues to freeze the water into
ice until the ice next to the ice size thermostat
probe has become thick enough to force water
over the probe. After the cold water has reduced
the temperature of the probe to 380F., the ice size
thermostat will switch the machine into the harvest
cycle.
The harvest cycle continues until the suction line
warms up enough to cause the harvest termination
thermostat to switch the machine back into the
freeze cycle.
During the harvest cycle, the refrigerant flows from
the condenser, through the discharge line to a
branch in the line containing the Hot Gas Valve.
This valve is Open during the harvest cycle,
allowing the hot discharge gas to bypass the
condenser and enter the evaporator at its inlet.
The hot discharge gases warm up the evaporator
enough to allow the surface of the ice frozen to the
evaporator to melt. The remaining ice will then fall
off into the bin.
Water Distribution
System
Hot Gas Valve (Open)
Discharge Line
Thermostatic
Expansion Valve
Condenser
Evaporators
Suction Line
Inlet
Water
Valve
Compressor
Water
Pump
(Off)
Fan Motor
(Off)
Dryer
Refrigeration Schematic
Water Reservoir
Siphon
Tube
(Draining)
January 1995
Page 17
SLE400
Technical Characteristics
Typical Cycle Time
• 16 - 17 minutes @ 90oF. air and 70oF. water
Typical Harvest Ice Weight
• 3.8 - 3.9 pounds .
Typical Low Side Pressure 8 minutes into freeze
• 22 PSIG @ 70o F. air
• 31 PSIG @ 90o F. air
• 36 PSIG @ 100o F. air
• 22-27 for water cooled
Typical Freeze Cycle Discharge Pressure
• 226 PSIG @ 70o F. air
• 290 PSIG @ 90o F. air
• 370 PSIG @ 100o F. air
• 270 for water cooled
Refrigerant Charge:
• Air cooled = 19 ounces R-404A;
Water cooled = 18 ounces R-404A
Harvest Time
• Normally 11⁄2 to 2 minutes. Depends upon time required to warm suction line to 55oF.
Typical Suction Pressure, In Harvest:
•
PSIG
Typical Discharge Pressure, In Harvest:
•
PSIG
High Pressure Cut Out
• Cuts out at 380 PSIG, resets at 315 PSIG
Thermostatic Expansion Valve
• Superheat
is 3o - 6oF.
Ice Size Thermostat:
• Switches to harvest cycle with temperature fall to 38oF.. Resets at 43oF.
Ice Size Heater
• Adds heat to ice size thermostat to prevent premature harvest. 6,000 ohms resistance.
Harvest Termination Thermodisk
• Switches from contacts C-NC to contacts C-NO at a temperature rise to 55oF. At
that point the
machine returns to the Freeze Cycle or switches OFF. The thermodisk resets at 40oF.
January 1995
Page 18
SLE400
Service Diagnosis:
SYMPTOM
No ice is made, nothing operates
No ice, compressor off
No ice is made, compressor is
operating
POSSIBLE CAUSE
Unit off, due to no power
Unit off, due to ICE/OFF/WASH
switch in OFF position
Unit off, due to bin thermostat
closed
PROBABLE FIX
Restore power
Switch ICE/OFF/WASH switch to
ICE
Check temperature at bin
thermostat bracket, if warmer than
40o F., thermostat should be
closed. Adjust/replace thermostat.
Unit off, due to relay K1 coil open Check relay K1, replace if coil is
open.
Water cooled unit off, due to high Lack of water to condenser,
pressure cut out open
check water supply and water
regulating valve.
No cooling due to compressor not Check compressor for voltage,
operating
continuity, and operation. Check
starting components. Replace if
found to be faulty.
If no voltage, check contactor,
replace if coil or contacts open.
Check temperature of
compressor, if hot may be lack of
refrigerant, defective TXV or
compressor
No water due to water turned off. Reconnect water supply
No water due to water filter
Replace water filter
plugged.
No water due to strainer screen
Clean out inlet screen
plugged
No water due to inlet water valve Replace valve
will not open
Water in reservoir, but no water
Water pump does not work,
over evaporators
replace pump
No cooling at evaporator due to
Replace hot gas valve
hot gas valve leaking thru
No cooling at evaporator due to
Check & replace fan motor.
fan not turning
Fan and pump do not have
Coil or relay open, replace relay.
power; hot gas valve opens and
closes.
No cooling at evaporator due to
Clean condenser
dirty condenser
No cooling due to compressor not Check system pressures, replace
pumping
compressor if not pumping
January 1995
Page 19
SLE400
Service Diagnosis:
SYMPTOM
No ice compressor is operating
POSSIBLE CAUSE
No cooling due to low refrigerant
charge
Ice is made, but not harvested.
Ice size thermostat contacts do
not switch position
Ice will not slide down ice rack
due to minerals on rack.
Ice will not slide down ice rack
due to ice rack out of position
Ice will not slide down ice rack
due to bent ice rack
Lack of heat during harvest cycle
due to unit in air temp. less than
550F.
Lack of heat during harvest due to
water flowing thru water cooled
condenser
Lack of heat during harvest due to
lack of refrigerant
PROBABLE FIX
Locate leak, recover remaining
refrigerant, replace dryer,
evacuate and weigh in nameplate
charge.
Ice not made near thermostat
probe due to water distributor
holes restricted. Clean water
distributor pan.
Thermostat defective, replace it
Clean machine with ice machine
cleaner.
Reposition ice rack
Replace ice rack
Warm up air or move machine.
Replace water regulating valve
Check low side pressure during
harvest. If low either the charge is
low or the hot gas valve does not
open fully. If charge is the
problem, locate leak, recover
remaining refrigerant, repair leak,
replace drier, evacuate and weigh
in nameplate charge.
Lack of heat during harvest due to Check low side pressure during
hot gas valve not opening fully.
harvest. If low either the charge is
low or the hot gas valve does not
open fully.
Ice does not slide down face of
Clean water system with ice
evaporator due to minerals on
machine cleaner
evaporator surface
Harvest cycle too short due to
Replace harvest termination
harvest termination thermostat
thermostat
opens at too low a temperature.
January 1995
Page 20
SLE400
Service Diagnosis:
SYMPTOM
Ice is made, but will not harvest
POSSIBLE CAUSE
Will not harvest due to hot gas
valve not opening.
Slow/incomplete harvest due to
hot gas valve not fully open.
Makes ice, but very little
Cubes are wrong size/shape
High discharge pressure, due to
dirty condenser; faulty fan motor;
not enough water thru water
cooled condenser, high water
temperatures, water reg. valve set
too high.
Inlet water temperatures and
room ambient very high
Long freeze cycle due to hot gas
valve leaking thru.
Compressor inefficient
Ice size thermostat not adjusted
properly
Freeze cycle too short due to
heater open
Water system is restricted with
minerals
Ice thickness probe tube covered
with minerals
Not enough water
Too much superheat
Ice fused together in bin
Ice in bin too long
Too many minerals in water
January 1995
Page 21
PROBABLE FIX
Check for voltage to coil in
harvest, if there is voltage
replace hot gas valve
Check low side pressure in
harvest, replace hot gas valve if
too low with correct ref. charge.
Check for causes of high
discharge pressure and correct.
Advise user, suggest additional
room cooling.
Check temperature of tubes to
and from hot gas valve; there
should be a temperature drop
across the valve in the freeze
cycle. Replace valve if temps are
nearly equal.
Check/replace compressor
Adjust ice size thermostat; use
gauge shipped with machine
Check/replace heater on ice size
thermostat probe tube.
Clean water system with
Scotsman Ice Machine Cleaner
Clean tube with ice machine
cleaner
Check water supply pressure
Check water supply for restrictions
Check superheat, replace TXV if
too high.
Check hot gas valve for leak-thru;
replace if leaks thru.
Advise user to pour water on ice
to ease removal
Suggest water treatment to user.
SLE400
Removal and Replacement
Ice Size Thermostat:
Primary Resistor (Heater)
Before replacing the ice size thermostat, it should
be positively determined that it is at fault.
1. Disconnect electrical power.
1. Disconnect electrical power.
2. Disconnect the primary resistor’s yellow wire
from terminal #4 and the white wire from terminal
#1. Pull the two wires out of the control box and
thru the insulated wall.
3. Mark location of probe tube bracket.
Electrical shock hazard.
Electrical shock can
cause personal injury.
Disconnect power before
beginning to service
components.
4. Remove two screws and the probe tube bracket
from the evaporator.
5. Remove the plastic sleeve and heater from the
tube.
6. Replace heater and plastic tubes.
7. Place probe tube bracket on evaporator in its
original position. Probe tube must be inserted into
plastic guide attached to evaporator.
2. Remove the front panel.
Evaporator
3. Remove the control box cover.
4. Locate the ice size thermostat.
5. Remove the two screws holding the control to
the control box, and lift the control out.
Heater
6. Pull the three wires off the posts of the ice size
thermostat.
7. Follow ice size thermostat capillary tube to ice
size probe.
Capillary
Tube
8. The end of the ice size thermostat is inserted in
a tube. Pull it out of the tube.
Probe Tube Bracket
9. Follow the capillary tube of the ice size
thermostat and pull it thru the insulated wall and
the grommet in the side of the control box.
10. Remove thermostat from control box.
Replacement of Ice Size Thermostat
11. Replace the ice size thermostat with the proper
part number, following the above steps from 9-1.
8. Replace wires.
9. Reconnect power, restart ice maker. Check ice
size.
January 1995
Page 22
SLE400
Removal and Replacement
Water Pump
Inlet Water Valve
The pump provides the force to move the water
from the reservoir to the freezing surface. The
pump does not need oil, but if it becomes noisy,
overheats, or will not pump it should be replaced.
Be certain to confirm electrical faults with a
voltmeter or ohmmeter before replacing the pump.
The pump should be operating whenever the
machine is in the freeze cycle.
The valve may plug-up from minerals in the water,
and should then be cleaned rather than replaced.
There is also a strainer located above the float
valve that may be cleaned.
1. Unplug or disconnect the electrical power.
3. Remove the screws holding the valve bracket to
the liner.
1. Shut off the water supply.
2. Unscrew the fitting at the top of the valve, and
pull the water inlet tube out of the valve body.
4. Remove the valve from the ice machine.
5. Reverse the above steps to reassemble.
Electrical shock hazard.
Electrical shock can
cause personal injury.
Disconnect power before
beginning to service
components.
2. Unplug the pump from its connection.
5. Loosen the two fasteners holding the cover to
the wall.
Pump Cover
6. Remove pump cover from the machine.
7. Pull discharge hose from pump discharge port.
8. Remove pump from ice machine.
Thumb
Screws
9. Reverse above steps to replace.
Float Valve
Siphon "U" Tube
January 1995
Page 23
Replacement of Water
Pump
SLE400
Removal and Replacement: Refrigeration System
This ice machine uses R-404A (HP62) 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.
• HP62 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.
LIQUID CHARGING Instructions for R-404A
Pressure-Temperature Chart for HP62
VAPOR
VAPOR
TEMP. PRESS. TEMP. PRESS.
(DEG F) (PSIG) DEG F) (PSIG)
-20
17
70
146
-18
18
72
150
-16
20
74
155
-14
21
76
161
-12
23
78
166
-10
24
80
171
-8
26
82
177
-6
28
84
182
-4
29
86
188
-2
31
88
194
0
33
90
200
2
35
92
206
4
37
94
212
6
39
96
219
8
41
98
225
10
43
100
232
12
46
102
239
14
48
104
246
16
50
106
253
18
53
108
260
20
55
110
268
22
58
112
275
24
60
114
283
26
63
116
291
28
66
118
299
E. When the proper charge is indicated on the scale, shut off the
manifold valve(s).
30
69
120
307
32
72
122
316
9. Shut off the valve on the refrigerant drum.
34
75
124
324
10. Re-open the manifold valves until all liquid has flowed out of the
hoses.
36
78
126
333
38
81
128
342
40
85
130
351
42
88
132
360
44
91
134
370
In preparation for charging, the low side hose should have a sight glass,
and/or a restrictor device (such as a "Charge Faster") installed in it for
metering liquid into the low side of the system.
1. After a thorough evacuation to at least 200 microns, shut off the
manifold valves and switch off the vacuum pump.
2. Place a drum of R-404A onto an electronic scale.
3. Attach the charging hose to the drum.
4. Open the valve on the drum and purge the charging hose.
5. Zero out the scale.
6. Shut the low side access valve at the ice machine.
7. Open the discharge manifold valve full open.
8. Watch the scale, when the correct charge is shown, shut the manifold
valve.
Note: If all of the charge will not "go in" the discharge side:
A. Shut the discharge access valve at the ice machine.
B. Switch the machine on.
C. Open the low side access valve at the ice machine.
D. Open the low side manifold valve and observe the sight glass to be
certain that only gas is flowing into the system.
11. Shut the low side access valve on the ice machine.
12. Remove hoses from ice machine and replace all caps.
January 1995
Page 24