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SLE300
Operator’s Manual
24 pgs428.18 Kb0
PARTS LIST
8 pgs188.15 Kb0

Scotsman SLE300 Operator’s Manual

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Introduction
SLE300
To the owner or user: This service manual is intended to provide you, and the maintenance or service tec hnician, with the information ne eded to install, start up, cle an, main ta in and rep air this product .
The SLE300 is an ice machine that produces cubed ice on 4 vertical cu be free zing surfaces.
The refrigeration system uses R-404A as the refrigerant.
Table of Contents
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Installation
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
SLD dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
RS or IS dispenser . . . . . . . . . . . . . . . . . . . . . . . . page 7
Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10
Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11
Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12
Electrical S equence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p age 13
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14
Water/ Refrigeration Schematic . . . . . . . . . . . . . . . . . . . . . . . . . page 16
Technical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p age 19
Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . page 22
Parts lists and wiring diagrams are loca te d in the center of this manual, printed on yellow paper. Note the warning symbo l where it appears in
this manual. It is an alert for impo rta nt safet y informatio n on a hazard that might cause serious injury.
Keep this manual for future reference. This manual was printe d on recyc led paper.
January 1995
Page 1
Drain
SLE30 0
Specifications
Information regardin g Model Numb er, Serial Number, Ampacity and Maximum Fuse Size are located on the nameplate of the ice ma chine. The model numbe r, serial number an d refrigerant charge are also list ed on the serial number plate just behind th e fr ont panel.
If recharging, always use the charge listed on the ice machine.
Nameplate
SLE300 Cabinet
Serial Number
Plate
3
⁄8"
1
Electrical
Inl et
3 3⁄4"
SLE300 Back View
(Air Cooled Model Show n)
Wate r
Inlet
1
4
20"
⁄4"
Specifi cations: The SLE300 will stack onto a
variety of ice storage bins, see sales literat ure for pro per ic e
22"
7
⁄8"
storage bin.
Model Number Dimensions
W" x D" x H "
Condenser
Type
Basic
Electrical
Minimum
Circuit
Ampacity*
Maximum Fuse Size (or HACR circuit
Refrigerant
Charge.
R-404A
breakers)
SLE300AS-1A 22 x 23 x 20 Air 115/60/1 17.3 20 15 ounces SLE300WS-1A 22 x 23 x 20 Water 115/60/1 15.8 20 15 ounces
* Minimum Circuit Ampac ity is used to determin e wire size and type per the Nationa l Elect ric Code.
January 1995
Page 2
For The Installer: Environmental Limitations
The ice machine must be inst alle d ind oors in a controlled environ ment.
Minimum Maximum Air Temp 55 Water Temp 40 Water Pressure 20 PSI 60 PSI Voltage 103.5 126.5
Operatin g the ice machine outside of the above limitations, or outd oors, is pote ntially damag ing 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 me et or exce ed the standards of UL, NSF, and CSA.
Scotsman assu mes no liability or res po nsib ility of any kind for pro duct s ma nufa ct ured by Scotsman that have be en alte red in any way, including the use of any part and/or other components not specifically approved by Scotsman.
0
F. 1000F.
0
F. 900F.
SLE300
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 coo led models is :
••Intake thro ug h the right side grill.
••Ex ha u st throug h the back.
Dashed Lines Sho w
Outline of Ice Drop
Area.
Bin Control Mounts to
Right of Ice Drop Area.
7"
3"
6
12"
1
⁄2"
SLE300
Top View
23"
Do not install where this air flo w is obst ruc te d.
6" Space Required for
Air Flow (Air Cooled
Only) and Util it y
Connections
January 1995
Page 3
SLE300
Installation
Water
The water supply for this ice machine has been in contact with man y mat eria ls s ince it fell fro m the sky as rain. All rain is slightly acidic , and tends to dissolve the mat eria ls it come s in con tact with . During water’s journ ey to the ice machine, it has flowed ove r and thro ugh th e gro und, been pick ed up by a municipal or priva te pump, fo rced thro ug h a series of pipes of diffe ring construction and may have been treated by the municipality providing the wat e r.
The water supplied to this ice machin e will then contain a variety of substances th at 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 t he minerals th at were in th e w ater solidif y in the pan. Durin g ice making only the water is frozen into ice, the minerals stay behind in the reservoi r. This machine drain s ou t some of the the water in the reservo ir eve ry cycle to minimize the amount of minera ls in th e water syst em, but after time the minerals will appear and have to be dissolved by ice machine cleaner, the n flu shed away during the clean ing proc ess .
Location
This ice machine may be installed in the open or under a counter. Clearance may be req uire d at the sides or top beyo nd what ’s nee ded to place the cabinet into posit ion. Air co oled mod els take air in the right side and exhaust out the back. Sp ace is required for utilit y con nections at the back.
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 limit s.
Pre-installation:
1. Inspect the place where the ice machine is to be installed . Check fo r:
••space for the cabinet,
••water supply,
••drain av aila bilit y
••and electrical power su pply.
No extension co rds are allowe d. The buildin g dra in inlet must be lower than the drain outlet of the ice bin. The wate r sup ply mus t have a ha nd shu t of f valve accessible when the unit is installed.
An ice machine is a food manuf act urin g pla nt ; it takes a raw material, in this case water, and transforms it into a food produ ct , ice. The purity of the water is very import an t in obta inin g pure ice and in maximizing product life .
The water to the ice machin e sh ould be filte red . Water filters vary greatly in ability and functio n. Install one that filte rs out suspende d solids to a dimension of 5 microns or less . The fine r the filte r the better , but finer filters may plug-up sooner than course on es. It may be necessary to add a course filter ahead of the fine filte r to prolong filter life. Polyphosphat e feed ers are usually ef fect ive in many water conditions.
Have the water teste d. Acid ic wate r or alka line water will both cause corro sion . Disso lve d solid s cannot be filtered out. Softened water is not recommended . Neve r use de-ionized water. Reverse-os mosis wate r must be treate d with bufferin g agen ts befo re us e in the ice mac hin e. Check with a water treatment specialist regarding testing , tre atment and filters.
January 1995
Page 4
Stacking
Installation: Ic e Storage Bin
Thermostat
Capillary Tube
SLE300
Assembly:
1. Attach the legs, or optional casters, onto the ice storage bin. Units th at are st ack ed shou ld only use legs, not casters.
2. Be sure that the top edge of the bin has a good gasket on it.
3. Place the ice machin e onto the stora ge bin.
4. Line up the ice machin e, check th at there is a good seal betwee n the ice mac hin e and th e storage bin.
5. If on a Scotsma n bin , at ta ch the ice mach ine to the bin using the stra ps and bolt s ship pe d 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, fo llow th e direct ion s included with that bin.
Bin Thermostat Installation:
1. Remove thermo sta t bra cke t fro m pac kage.
2. Attach the bin thermostat bracket to the bottom of the ice machine usin g the thumb sc rews provided. The re are pre-d rilled and tapped holes located just to the right of the cube drop area.
Stacking:
This machine will stack onto any SLE300 or SLC400. Note : Do not us e cas ters wh en sta ckin g.
1. Remove and discard the left top panel from the lower unit.
2. Rem ove knock ou t plug from t op right panel.
3. Place gaske t mat eria l around the top of the bottom uni t’ s cabinet & evapora to r compartment.
4. Carefully lif t the uncrat ed 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 bott om one with the hardware and st rap s ship pe d with the upper machine.
7. Locate and uncoil all of the bin thermo st at capillary tube .
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 brac ket .
Bin Thermostat
Bracket
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 comp ress or) and through the bin thermostat bracket.
Note: SLB150: Use thermostat
bracket packed with that bin.
Bin Thermostat
Installation
Routing Hole
Capillary Tube
Fasten Cabinets
Together At Back
With Straps &
Screws.
Bin Thermostat
Bracket
January 1995
Page 5
Bin Thermostat Capillary
Tube Installation
SLE30 0
Installation: SLD150 Hotel Dispenser
Assembly
The ice machine must be pla ced ont o the top of the dispenser, an d 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 thermost at bracket , and make sure that it is open.
3. Place a corner post from the ice mac hin e cart on at the front of left and right sides of the hotel dispenser top.
4. Use a mechanica l lif t and pla ce th e ice ma chin e onto the dispenser. The cardboard corner posts should kee p the fro nt edg e of the ice mach ine up.
5. Remove the front panel of the ice machine.
6. Locate the bin thermostat capillary tube and unc oi l about 18" of tub ing.
7. Locate plastic tube in base of ice machine, next to compressor and push the end of the capillary tu be thru the tube, watch the capilla ry as it comes out of the base, line it up with the inlet hole of the thermosta t bracket an d push it into the hole. Move the cab ine t of the ice mach ine until the capillary tube is going straight down into the inlet hole.
8. Carefully remove the corner posts.
9. Push the capillary tube into the thermostat bracket tube until abou t 14" of capillary tube is in the tube.
9 Remove the hardware package from the mach ine , remove brackets.
10. At the back of the dispenser, fasten brack ets to the ice machin e.
1 1. Using bracke ts for te mpla tes, drill 1/8" holes into the back of the dispenser.
Route Capillary Tube
Through Plastic
Tube In Base
Bin Thermostat
Bracket Mounted In
Dispenser
Temporarily
Support Machin e
With Corner Posts
To Observe Cap
Tube Installat ion
12. Secure bra ckets to the dispenser with sheet metal screws from the hardware packa ge.
13. Follow other ins tallat ion instructio ns from the SLD150.
January 1995
Page 6
Installation: Sc ot sman IS or RS Dispens e r
RS or IS
Dispense r
SLE300
Assembly:
The assembly of the ice machin e onto the dispenser requires two addit ion al parts: an adapte r kit and a thermostat stand off kit.
1. Mark two spots on the inside left liner of the dispenser: 2" down fro m the top, 4" from the back, and 4" apart.
2. At the two marked spots , drill two 1/4 " holes thru the plastic liner only.
3. From the stand off kit, locate the stand offs and plastic anchors. Thread the stand offs partially into the plastic anchors.
4. Push the anchors/stand offs into the holes.
5. Screw the stand of fs all th e way into the anchors. Be sure th at the hole s in the stand offs are horizontal.
6. Place a bead of silastic (from the kit) aro und the stand off s.
7. From the adapter kit , pla ce th e st ain less stee l 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.
9. Route the capillary t ube thru th e front hole in the base of the ice mac hine, to the left side if the dispenser towards the stand offs.
10. Route the end of the capillary tube thru th e stand offs, bend the tube around the stand offs so that it does not fall off.
1 1. Check that th e routing of the capilla ry tube is away from the ice chute and up high near the base of the ice machine.
Installation of Bin Thermostat
Capillary Tube
K1 Kit Adapter
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 Front
Plastic Tube
Route Capillary
Tube Through
Stand Offs
January 1995
Page 7
SLE300
Installation
For The Plumber
Supply:
Screw the 3/8" male fla re (fit tin g sh ipped in package insid e cabinet) into the 1/4" FPT fitting at the ba c k of the cabi net (thread tape recommend ed). Con ne ct co ld pota ble wate r to th e water inlet. A hand shut of f va lve fo r inlet wate r should be insta lled near t he mach ine . A wat er filt er is recommended. Flush the water line prio r to connect ing to the ice machine.
If water cooled , con nect a separate water inlet line to the water cooled condenser inlet fitting. It should also have a hand shu t off valve.
Drains:
Connect a drain tube to the reserv oir dra in fit tin g at the back of the cabinet. The drain tube from the fitting mus t be run separa te ly fro m any ot her drain tube. The reservoir drain is a 3/4" F.P.T. bra ss fitting.
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 mus t be vented if the re is a lon g horizontal run (5’ or more). The reservoir drain mus t be vented and not connected to th e bin drain. All drains are gravity, and must have a minimum fall of 1/4" per foot of horizon tal ru n.
Wate r Coole d: The wat er cooled condenser drain is not vented, and is routed separately.
Maintain th e air gap req uire d by local co de between the end of the drain tubes and the building drain rec epta cle.
Note: Drain tu bin g sh ou ld be insulated to prevent condensation from forming on the tubing.
CONFORM TO ALL LOCAL CODES
3/8 Male Flare
Water Inlet
Water Shut
Off Valve
Reservoir Drain
3/4" FPT, Must Be Vented.
Bin Drain. May Be Routed F rom
The Bottom On Some Model
Bins. Fittin g May Be Plastic.
DO NOT OVERHEAT.
3/8" FPT Inlet
Water Cooled
Condenser Plumbing
Connections
1/2" FPT
Outlet
Ice Storage Bin
(Typical)
Water Supply and Drain Con necti on s
January 1995
Page 8
Installation
SLE300
For The Electr ic ia n
This unit must be on a separat e 115 volt AC 60 cycle single phas e power sup ply. The maximum fuse size for this circuit is listed on the name plate , and per th e nameplate use fuses, or HACR circuit breakers.
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 provide d in the junction box.
Hand Disconnect Switch
Junction Box
Follow All Local Codes - This Unit Must Be Grounded. Usually a licensed electrician will be
required to connect th e elect rical se rvice .
January 1995
Page 9
SLE300
After Utility Connections
1. Level the cabine t, use the leg leve lers on the end of the legs to adjust the ca binet height. (Legs should have be en installed when the bin was unpacked) .
2. Wash out the bin. If desired, the interior of the bin could be sanitized.
Final Che ck List
1. Is the ice maker cabinet in a roo m where ambient temperature s are within the minimum and maximum temperat ure s specified?
2. Has the water supply been connected?
3. Is the wa ter pressure adequate?
4. Have the water connections b een checked for water leaks?
5. Have the drain con nections been made?
6. Have the drain connections been checked for leaks?
7. Is the cabinet level?
8. Is the ice machine connect ed to a 1 1 5 volt electrical power supply and is the ice machine the only load on that circuit?
9. Has all of the shipping material been remov ed from the inside of the cabinet?
10. H as the bin and cabinet been wiped clean and sanitized ?
11. Has the Customer Evaluation & Warranty Registration form been properly fille d out? Check for correct mod el and se rial numbe rs f rom the nameplate, then mail the comple te d form to Scotsman .
12. Has the owner/u ser been give n the name and telephone number of the au thorized Scotsman Service Agency serving that location?
January 1995
Page 10
Component Location
ICE/OFF/WASH Switch
Bin Thermostat
Control Box
Many components are serv icea ble from th e front without removin g the side panels .
SLE300
Behind the front panel:
•• Water pump
•• Inlet water va lve
•• Reservoir
•• Evaporators
•• Water distributor pan
•• Ice size control adjustment
•• ICE/OFF/WASH switch
•• Control box
Ice Size
Thermostat
Compressor
Relay
Ice Thickness Contro l
Control Bo x Detail
High
Pressure
Cut Out
Harvest
Relay
Bin
Thermostat
Ice/Off/Wash
Switch
Water Distributor
Pan
Bin Thermostat
Bracket
Water Inlet Valve
& Strainer
Water Pump
Drain Elbow
Componen t Locati o n
January 1995
Page 11
Correct Size &
Shape
Cube Size Diagram
Set
Screws
SLE300
Initial Start Up
After the final check list has been gone through, the ice machine may be started up.
1. Open the water sh ut of f va lve; the inlet wate r valve will open, and water will flow into the reservoi r..
Ice Thickness
Probe Adjustment
2. Switch on the electrical power.
3. Remove the front panel.
3. Locate the I CE/OFF/WASH switch, switch
Up for LARGER
Down for SMALLER
it to WASH.
4. The water pump will begin to pump water ove r the ev aporator s .
5. Allow the reservoir to refill. Norma l water leve l is 1/8" below the high point of the lowe r curve of the sip hon u-tub e.
6. Switch the ICE/OFF/WASH switch to OFF.
7. Check the action of the siphon. The water level in the reservoir sho uld drop to the bottom curv e of the U-bend (normal water level) in about 2 minutes. If not, check for proper drain tube connections.
Ice Size Adjustment
Plate:
Cubes Too
Thick
8. Switch the ICE/OFF/WASH switch to ON.
9. On air cooled models the fa n motor will beg in to turn, and warm air will be discharged from t he back of the ice machine .
On water cooled models warm water will begin to flow from the conden ser dra in.
10. The water temperatu re in the res ervo ir will soon b e 32
0
F., and ice should begin to form on the
evaporato rs. 1 1. Allow the ice mac hine to operat e for abo ut
15-20 minutes . The ice sho uld be fully f orme d and should be harvested within a few minutes.
12. After harv est , ch eck the ice cub e size .
Compare a fresh cube to the diagram on the back of the front panel. If needed, adjust the
cube size by loosening the two set screws and moving the ice thickness probe plate.
Move the plate down for smaller cubes and up for larger . Re-tighten set screws.
For proper operat ion , th e ice thick ness sho uld be
11
set to the 1
⁄16" diameter.
The machine is designed to harvest cubes of only the correct thickness.
1 11⁄16"
Cubes Too
Thin
January 1995
Page 12
Initial Start Up
SLE300
Note: If the fi rs t ba tch of cu be s are not all un ifo r m discs, some ice machin e cle an er sho uld be added to the reservoir.
1. After ice ha s been harvested, but be fore new cubes begin to form, switch the ICE/OFF/WASH switch to WASH.
2. Add 4 oz. of ice machine cleaner to the reservoi r. Allow unit to operate that way fo r 10 minutes.
3. Switch ICE/OFF/WASH switch to OFF
4. Shu t the water supply of f.
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 machin e will have to harvest all of the cub es befo re it go es back into the freeze cycle.
14. Check operation of the bin co ntrol circu it by holding ice on the bin control tu be in the bin.
If the ice maker does no t sto p with in 1 minute , while keeping ice on the th ermostat, rotate the bin thermostat shaft counter clockwise until the ice maker does stop. Remo ve the ice from th e capillary tube; the ice make r sho uld resta rt with in 2 minutes. If it do es not, rotate the adjust ing shaf t clockwise until the machines starts.
15. Replace all the panels. The ice machine is now ready for automatic operation.
Siphon Tube Schematic
U-Tube Adjusted
Here = No Purge
Siphon Breaker Hole
U-Tube Here =
Maximum Purge
Water Level
At Harvest
Water Level With
Pump ON
Water Inlet
1/8 - 1/4
Drain Outlet
Elbow
Bottom of
Reservoir
January 1995
Electrical Sequence:
Freeze Cycle:
During the first part of the free ze cyc le, the ice machine comp res sor, fan motor if air coole d, and water pump are operat ing.
Assume the bin thermo stat is open (low ice), relay K1 will NOT have power thru its coil and K1 contacts 6-2 will be closed, connec tin g power to the ice size thermosta t.
The ice size thermostat con tact 2-3 are clo sed, connecting power to the fan and pump motors.
The Harvest Termin ation Thermo st at 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 , th e compressor is operating, and the hot gas valve is energized . The wate r pump is off, and air cooled mod els swit ch the fan off.The bin thermo stat is still open .
When the ice near the ice size thermo sta t se nsin g tube grows large enough to force water over the sensing tu be , th at tub e loo se s hea t, and at 38 contact s 2-3 ope n and 2-1 close.
This removes power from the water pump and fan and connects power to the defrost relay coil. Whe n the relay coil has power, it connects power to the:
••Hot gas valve coil
The harvest termination switch is closed, an d power flows thru it to the defrost relay coil. This keeps the relay energized, even when the ice size thermostat switch es cont act pos itio n as a result of ice falling away from th e sensin g tube .
The unit stays in the harves t cycle until the thermodisc on the suctio n line warms up to 55 at that time the defrost thermodisk switches to NO and the harvest cycle is termin at ed. If the bin thermostat is still open, relay K1 will st ill not have power and the unit will go back into the freeze cycle. If rela y K1 has power, it shuts off th e ice machine by cutt ing power to the ice size thermostat and contactor coil.
The ice size thermostat heater is on. 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.
Page 13
o
F.
o
F.,
SLE30 0
Maintenance, Cleaning and Sanit izing
Cleaning Schedule:
••Scrub the outside of the cabinet once a week
wit h soa p and water.
••Sanitize the bin interior once a month.
•• Clean the water system and air cooled
condenser a minimum of twice per y ear. If in an area of high mineral con ce nt rat ion in the wate r supply, clean wate r syst em 4 times a year.
Air Cooled condenser (air cooled only):
Remove th e right side pan el. The air flow thru the cond enser is fro m f ron t to
back, so dust will build up on the fan side of the condenser fin s.
The fan motor, bracket and part of the shroud may be removed as an assembly:
1. Unplug the fan motor.
2. Remove 3 screws at the righ t edge of the fan shroud.
3. Pull the assembly out th e right side . The condenser fins are then visible for cleaning.
The fins of the condenser will become fo ule d with dirt, and must be cleaned. A vacuum cleaner with a soft brush attac hme nt will extrac t most loose dust stuck to the surface of the condenser fins..
Water cooled un its:
The water cooled condenser may, over time and under certain water conditions, become internally restricted by minerals. Thes e will have to be dissolved by acid or the condenser replaced. Only a qualified service agent should att emp t th is type of service.
Ice Storage Bin
Every 30 days, the liner should be sanitiz ed with a commercial ice machine san itize r, according to the direction s of the sanitizer, or with a solu tio n of household bleach a nd water:
1. Mix the bleach and water using the ratio of two ounces of blea ch to two gallons of water.
2. Wipe all interior surfa ces of th e ice storage bin with the bleach and water.
3. Allow t o air dry.
T o Re move Scale:
1. Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of warm
0
F.-1100F.) water.
(95
2. Using rubber gloves, dip a nylon scouring pad into the clean ing solut ion and scrub the scale off the liner .
3. After the scale ha s been remove d, rinse all surfaces inside the bin with clean, potable water.
Stainless Steel Bin Liner
The stainless ste el line r of th e bin will require periodic cleaning. Chemicals in the water suppl y, such as chlorine, cause bro wn stains to appear on the surface of the sta inle ss ste el pa rts .
1. General Cleaning - staining is usually remov ed by washing the parts with ordinary cleanin g powder such as Bon-Ami or Copper-Glo and water. After cleanin g, rin se with clea r wate r.
2. Water tre atment. The chlorine enters the machine fro m the municip al water supply . It can be removed from the wate r supply by us ing a charcoal or ac tiva te d carbo n wat er filt er to trea t th e 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 cleane rs containing petroleum products.
A nylon type brus h may be used to scrub stubbo rn deposits.
January 1995
Page 14
Cleaning: Ice Machine Water System
Dissolve and Remove Minerals:
SLE300
1. Remove front panel.
2. Move the ICE/OFF/WASH switch to OFF.
3. Remove the splash guard.
4. Shu t the water supply of f.
5. Drain the water from the sump by removing the drain elbow.
6. Disconnect hose from the wat er dis trib ut or pan, and remove the water distrib utor pa n.
7. Mix a solution of 5 oz . ice mac hin e clea ne r and 1 gallon of warm (95
Scotsman Ice Machine Cleaner contai ns acids. These co mp ou nd s may cause bur ns.
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 CH ILDR E N.
8. Wash the splash guard, drain elbow and water distributor pan with the ice machine cleaner/water solution.
9. With the solutio n of ice mach ine cleaner and water, wash the refrigerat ion tub ing , line r, evaporato rs, su pport brack et s and the water p ump assembly. Use the brush an d/ or a cle an cloth .
10. Replace th e dr a i n e lbow . 1 1. Open the wat er sup ply and allow the sump to
refill.
12. Add 5 oz. ice mac hin e clea ner t o the su mp area.
13. Replace th e water distributor pan and splash guard. Be cert ain the hose to water dis trib ut or pa n is connected to pan.
14. M ove the ICE/OFF/WAS H swit ch to wash and allow the solutio n to circula te for 15 minut es, then mov e the ICE/O FF/WA S H swit ch to OFF.
o
F. - 115oF.) water.
17. Remove the splash guard.
15. Shut the water supply off.
16. Drain the water from the sump by remo vin g the drain elbow.
Sanitize:
17. Remove the water distrib ut or pan.
18. Mix a sanitizer solutio n of 1 ounce of household bleach to 2 gallons of warm (95
o
F.) water
115
19. Wa sh th e sp lash gua rd and th e wat er distributor pa n with the solut ion of sanit izer. 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 th e water distributor pan and splash guard. Be certain that the hose to the water distributor pa n is tightly connec ted to the pan, and that the flow washer in the hose is not in sideways.
22. Replace th e dr a i n e lbow .
23. Add ice machin e sanit izer so lution to the sump area until it is full.
24. M ove the ICE/OFF/WAS H swit ch to W ASH add more sanitizer solu tio n 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 remo vin g the drain elbow.
28. Replac e the dra in elbow and splash guard
29. Open the water supply an d allow the sump to refill.
30. M ove the ICE/OFF/WAS H swit ch to ICE.
31. Replace the front panel.
32. Discard first batch of ice and all other batch es until all traces of cle aner and sanitiz er disappear.
o
F. -
January 1995
Page 15
Fan Motor
(On)
SLE300
Refrigeration Schem atic :
Freeze Cycle:
From the compresso r, hot discharge gas is pumped to the conde nse r, either air or water cooled.
At the cond enser, he at from the refrigerant flows into the cooling med ium, eith er air or wat er, and the refrigeran t co nden ses into a liquid . From the condenser the liqu id ref rige ran t flo ws th rou gh the liquid line to the metering device - a thermostatic expansio n va lve.
At the expansion valve , th e liqu id ref rige ran t passes fro m a high press ure zone to one of relatively low pressure, and in the low pressure zone it evapora tes. The low pressure zone where the refrigerant evaporates is the evapora to r. When the refrigeran t ev apora te s, it abso rbs he at from th e metal parts of the evapo rat or an d the water flowing over it.
From the evaporator, the refrigerant flows back to the compresso r through the suction line.
Water Schematic: Wate r flows int o the ice machin e fro m its inle t
connection at the back of the cabinet, through the inlet water va lve and int o the res ervo i r. The water in the reservoi r is pump ed up and th rou gh the water distrib ut or tube at the top of the evapora to rs. From there, the water flo ws over bot h sides of the evaporators and back into the reservoir.
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 .
Evaporators
Inlet Water
Valve
Float
Valve
Water Distribution
System
Water Pump
(On)
Thermostatic
Expansion Valve
Suction Line
Hot Gas Valve (Closed)
Discharge Li ne
Condenser
Compressor
Dryer
Water Reservoir
Siphon
Tube
Refrigeration Schematic
January 1995
Page 16
Harvest Cycle:
Condenser
Compressor
Refrigeration Schematic
Fan Motor
(Off)
SLE300
The ice maker con tin ure s to fre ez e the wat er int o ice unitl the ice next to the ice size thermostat probe has become thick enough to force wate r over the pro be. After the cold water has red uced the temperature of the probe to 38
o
F., the ice size thermotsta t will switch the machin e into the harve st cycle.
During the harvest cyc le, the refrig era nt flows from the condenser, through the discharg e line to a branch in the line cont ain ing the Hot Gas Va lve . This valve is Open during the harve st cyc le, allowing the hot discharge gas to bypass the condenser and enter the evapo rat or at its inlet .
The hot discharge gase s warm up the ev apora to r enough to allow the surf ace of the ice froze n to the evaporator to melt. The remain ing ice will then fall off into the bin .
Water Distribution
System
During the Harvest Cycle, the water level rise s, filling the reservoir ove r the siphon tube and siphoning some of the res ervo ir wate r out to the drain.
The harvest cycle continues until the suction line warms up e nough to cause th e harvest termination thermost at to switc h the machine bac k into the freeze cycle.
Evaporator s
Inlet Water Valve
Water Reservoir
Water Pump
(Off)
Sipho n
Tube
(Draining)
Thermostatic
Expansion Valve
Suction Line
Hot Gas Valve (Open)
Discharge Li ne
Dryer
January 1995
Page 17
SLE300
Technical Charact eris ti cs
Typical Cycle Time
••18 minutes @ 90
Typical Harvest Ice Weight
••2.8 - 3.2 pounds
Typical Low Side Pressure, 8 minutes into freeze
••20 PSIG @ 70
••26 PSIG @ 90
••42 PSIG @ 100
••22 - 27 PSIG for water cooled
Typical Freeze Cycle Discharge Pressure
••196 PSIG @ 70
••262 PSIG @ 90
••350 PSIG @ 100
••270 for water cooled
o
F. air and 70oF. water; 15 minute s @ 70oF. air and 50oF. water
o
F. Air
o
F. Air
o
F. Air
o
F. Air
o
F. Air
o
F. Air
Refrigerant Charge:
••15 ounces R-404A
Harvest Time
••Normally 1
Typical Suction Pressure, In Harvest:
1
⁄2 to 2 minutes. Depends upon time required to warm suc tio n line to 55oF.
••
Typical Discharge Pressure, In Harvest:
••
High Pressure Cut Out
••Cuts out at 380 PSIG, reset s at 315 PSIG
Thermostatic Expansion Valve
••Superheat is 3
Bin Thermostat
••Cut In to shut OFF machine at 35
Ice Size Thermostat:
o
- 6oF.
o
F.; Cut Out to Start ma chin e at 39oF. Adjustable warme r.
•• Switches to harve st cyc le with temp eratu re fa ll to 38
oF.
Resets at 43oF.
Ice Size Heater
••Adds heat to ice size th ermo st at to preven t pre mat ure harv est. 6, 000 ohms resis ta nce .
Harvest Termination Thermostat
•• Switc hes from cont acts C-NC to contacts C-NO at a temperature rise to 55
Resets at 40
o
F.
January 1995
Page 18
o
F. (return to freeze or OFF).
Service Diagnosis:
SYMPTOM POSSIBLE CAUSE PROBABLE FIX
No ice is made, nothin g opera te s Unit off, due to no power Restore po wer
Unit off, due to ICE/OFF/WASH switch in OFF position
Unit off, due to bin thermo st at closed
Unit off, due to relay K1 coil open. Check relay coil, if open repla ce
Water cooled unit off, due to high pressure cu t ou t op en
No ice, compress or of f No cooling due to compressor not
operatin g
No ice is made, compressor is operatin g
No water due to water turned off. Reconnect water supply No water due to water f ilte r
plu gged. No water due to strainer screen
plugged No water due to inlet wate r valve
will not open Water in reservo ir, bu t no water
over evaporators No cooling at evaporator due to
hot gas valve lea king thru No cooling at evaporator due to
fan not turning Fan and pump do not have
power; hot gas valve opens and closes.
No cooling at evaporator due to dirty condenser
No cooling due to compre sso r n ot pumping
Switch ICE/OFF/WASH switch to ICE
Check temperature at bin thermostat bracket, if warmer than
o
F., thermostat should be
40 closed. Adjust/replace thermostat.
relay. Lack of water to condenser,
check water sup ply and wat er regulating valve.
Check compressor for voltage, continuity, and operation. Check starting components. Replace if found to be faulty.
Check temperature of compresso r, if hot may be lack of refrigera nt, defe ctiv e TXV or compresso r
Replace wat er fi lt er
Clean out inlet screen
Replace valve
Water pump does not work, replace pu mp
Replace ho t gas valv e
Check & replace fan motor.
Coil or relay open, rep lac e rela y.
Clean condenser
Check system pressures, replace compressor if not pumping
SLE300
January 1995
Page 19
SLE30 0
Service Diagnosis:
SYMPTOM POSSIBLE CAUSE PROBABLE FIX
No ice compresso r is operating No cooling due to low refrig era nt
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 ra c k
Lack of heat during harv est cycle due to unit in air temp. less than
0
F.
55 Lack of heat during harvest due to
water flowing thru wate r coo led condenser
Lack of heat during harvest due to lack of refrigerant
Lack of heat during harvest due to hot gas valve not opening fully.
Ice does not slide down face of evaporato r due to mine rals on evaporator surface
Harvest cycle too short du e to harvest termina tio n thermo stat opens at too low a temperature.
Locate leak, recover remaining refrigera nt , rep lace drye r , evacuate and weigh in nameplate charge.
Ice not made near thermo st at probe due to water distribut or holes restricted. Clean water distributor pan.
Thermosta t de fective, replace it Clean machine with ice mach ine
cleaner. Reposition ice rack
Replace ice rack
Warm up air or move machine.
Replace water regulating va lve
Check low side pre ssu re du ring harvest . If low eith er th e cha rge is low or the hot gas valve does not open fully. If charge is the problem, locate leak, recover remaining refrig era nt , rep air leak, replace drie r, ev acu at e and weig h in nameplate charge.
Check low side pre ssu re du ring harvest . If low eith er th e cha rge is low or the hot gas valve does not open fully.
Clean water system with ice machine cle aner
Replace harve st termination thermostat
January 1995
Page 20
SLE300
Service Diagnosis:
SYMPTOM POSSIBLE CAUSE PROBABLE FIX
Ice is made, but will not harvest 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 litt le High discharg e pressu re, due to
dirty condens er; faulty fa n 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 leakin g thru.
Compressor ine ff icie nt Check/re pla ce compressor
Cubes are wrong size/sh ape Ice size thermostat not adjust ed
properl y Freeze cycle too sh ort due to
heat e r open Water system is rest rict ed with
minerals Ice thickness probe tube covered
with minerals Not enough water Check water supply pressure
Too much superheat Check superheat, replace TXV if
Ice fused togethe r in bin Ice in bin too long Advise user to pour water on ice
Too many minerals in water Suggest water treatment to user.
Check for volt ag e to coil in harvest , if th ere is voltage replace ho t gas valv e
Check low side pressure in harvest, replace hot gas valve if too low with correct ref. charge.
Check for causes of high discharg e pre ssu re and corre ct .
Advise user, sugg est additio na l room cooling.
Check temp erature of tubes to and from hot gas valve; th ere should be a temp erature drop across the valve in the freeze cycle. Replace valve if temps are nearly equal.
Adjust ice size thermostat; use gauge shipped with machine
Check/re pla ce he at er on ic e size thermostat probe tube.
Clean water system with Scotsman Ice Machine Cleaner
Clean tube with ice machine cleaner
Check water supply for restrictions
too hi g h. Check hot gas valve for leak-thru;
replace if lea ks th ru.
to ease remova l
January 1995
Page 21
SLE30 0
Removal and Replacem ent
Ice Size Thermostat:
Before replac ing the ice size thermostat , it should be positively determine d that it is at fault.
1. Disconnect electrical power.
Electrical sho ck hazar d.
Electrical shock can cause personal injury.
Disconnect power before beginning to service components.
2. Remove the front panel.
3. Remove the control box cover.
4. Locate the ice size thermostat.
5. Remove the two screws holdin g the cont rol to the control box, and lift the con tro l out.
6. Pull the three wires off the posts of the ice size thermost at.
Primary Resistor (Heater)
1. Disconnect electrical power.
2. Disconnect the primary resisto rs yello w wire from terminal #4 and the white wire from te rmina l #1. Pull the two wires out of the control box and thru the insulated wall.
3. Mark locatio n of adju st ment bracket.
4. Remove two screws and the ice size thermo stat probe tub e bra cke t.
5. Remove the evaporator side plastic sleeve and heater from the tube.
6. Reverse the prio r ste ps to re pla ce . Pro be tub e must be inserted into plas tic guide att ac hed to evapora tor.
7. Place adjustmen t bra cke t in its origin al position. Check ice size.
Evaporator
Heater
Probe Tube
& Bracket
7. Locate bulb on suction line.
8. Follow the capillary tube of the ice size thermost at: th e end of the ice size thermostat is inserted in a tube. Pull it out of the tube.
9. Pull the capillary tube of the ice size thermost at thru the grommet in the side of th e contro l box .
10. Remove the ice size thermo st at from the control box.
11. Replace the ice size thermo sta t with the prop er part number, following the above steps fro m 1 0-1 .
Capillary
Tube
Replacement of Ice Size Thermostat
January 1995
Page 22
Removal and Replacem ent
SLE300
Water Pump
The pump provides the force to move the water from the rese rvoir to the free zin g 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 th e pump. The pump should be opera ting whenever the machine is in the free ze cy cle.
1. Unplug or disconne ct the elect rica l powe r.
Electrical sho ck hazar d.
Electrical shock can cause personal injury.
Disconnect power before beginning to service components.
Inlet Water Valve
The valve may plu g-up from minerals in the water, and may be cleaned rather tha n rep lac ed.
1. Shu t off the wat e r supply.
2. Unscrew the fitt ing at the to p of the valve, and pull the water inlet tube out of the valve body.
3. Remove the screws h old ing the valve brac ket to the liner .
4. Remove the valve fro m the ice mach ine.
5. Reverse the abov e ste ps to reassemble.
2. Unplug the pump from its connection.
5. Loosen the two fasteners holding the cover to the wall.
6. Remove pump cov er fro m the machin e.
7. Pull discharge hose fro m pump disch arg e port.
8. Remove pump from ice machine.
9. Reverse abov e ste ps to rep lace .
Float Valve
Siphon "U" Tub e
Pump Cov er
Thumb
Screws
Replacement of Water
Pump
January 1995
Page 23
VAPOR V APOR 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 30 69 120 307 32 72 122 316 34 75 124 324 36 78 126 333 38 81 128 342 40 85 130 351 42 88 132 360 44 91 134 370
SLE300
Removal and Replacement: Refrigeration System
This ice machine uses R-404 A (HP6 2) ref rige ran t and polyole ster oil. Do NOT use mineral oil in this refrig era tio n syste m.
••R-404A is a "Near Aze otrope" so liquid charging is require d:
••When the system is serv iced , a specia l liquid line drie r is requ ired . It is
included with replacement compressors.
••HP62 is not comp atible wit h mineral oil, so th ese ice mach ine s use
Polyoles ter oil. Po lyole st er oil ab sorb s wat er very easily . When one of these refrige rat ion systems is opened for service, it must be re-seale d as soon as possible (15 minutes maximum).
••Special leak detec tio n equip men t is required to locat e small refrige ran t
leaks. Usua lly a lea k det ec to r capa ble of de tecting a Halongenate d refrigerant or HFC-134a will work. Check with the leak detect or manufactu rer if in doub t.
LIQUID CHARGING Instructions for R-404A In preparation for charging, the low side hose should ha ve a sight glas s,
and/or a restrictor device (such as a "Charge Faster") installed in it for metering liqu id int o the low side of the syste m.
1. After a thorough evacuat ion to at leas t 200 microns, shut of f the manifold valves and switch off the vacuum pump.
2. Place a drum of R-40 4A ont o an elect ron ic sca le.
3. Attach the chargin g hose to the drum.
4. Open the valve on the drum and purge the chargin g 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 sca le, when the correct charg e is shown, shut the manifold valve.
Note: If all of the charge will not "go in" the discharge side:
A. Shut the discharge acce ss valv e at the ice mach ine . B. Switch the machine on . C. Open the low side acces s valve at the ice machine. D. Open the low side manifo ld valve an d obse rve the sig ht glass to be
certain that only gas is flowin g int o the sys tem.
E. When the proper charge is indicated on the scale, shut of f the
manifold valve(s ).
9. Shut off the valve on the refrig erant drum.
10. Re-open the man ifo ld va lves unt il all liquid has flo wed out of the hoses.
Pressure-T emperature Chart for HP62
11. Shut the low side access valve on the ice mach ine .
12. Remove hoses from ice machine and replace all ca ps.
January 1995
Page 24
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