Automatic Ice maker
Service manual
MIM250
1
Table of contents
Installation Guidelines ---------------------------------------------------------3
How the Ice Maker Works ----------------------------------------------------4
Water System --------------------------------------------------------------------5
Wiring Connections and Controller ------------------------------------------8
Exploding Drawing -------------------------------------------------------------11
TroubleShooting ----------------------------------------------------------------13
Before Maintenance ------------------------------------------------------------13
Basic Checking ------------------------------------------------------------------13
TroubleshootingGuide ----------------------------------------------------------14
Adjustment and Replacement -------------------------------------------------19
Advanced component troubleshooting techniques --------------------------20
Spare parts list ------------------------------------------------------------------- 26
2
Installation Guidelines
Note: Installation should be performed by a trained Service Technician.
For proper operation of the ice machine, the following installation guidelines must be followed.
Failure to do so may result in loss of production capacity, premature part failures, and may void all
warranties.
Ambient Operating Temperatures
Minimum Operating Temperature: 50°F (10°C)
Maximum Operating Temperature 100°F (38°C).
Note: These products are not designed for outdoor installation.
Incoming Water Supply
Minimum incoming water temperature: 40°F (5°C)
Maximum incoming water temperature: 90°F (32°C)
Minimum incoming water pressure: 15 psig
Maximum incoming water pressure: 80 psig
Note: If water pressure exceeds 80 psig, a water pressure regulator must be installed.
Drains: Route bin drain, purge drain and water condenser drain individually to a floor drain. The
use of condensate pumps for draining water on equipment producing over 200 lbs./day is not
recommended by Manufactor. We assumes no responsibility for improperly installed equipment.
Water Filtration
A water filter system should be installed with the ice machine.
Clearance Requirements
Self contained air cooled ice machines must have a minimum of 6 inches (15cm) of clearance at the
rear, top, and sides of the ice machine for proper air circulation. Since undercounter machines
breathe from the front, top and side clearances are minimal.
Stacking
If the ice machines are to be stacked, refer to the instructions in the stacking kit. We does not
endorse stacking aircooled ice machines.
Dispenser Application
A thermostatic bin control kit must be installed if the ice machine is placed on a dispenser. A bin
top may or may not be required.
Ice Maker Maintenance
Maintenance Procedure
1. Clean the icemaking section per the instructions below. Cleaning should be performed a
minimum of every 6 months. Local water conditions may require that cleaning be performed more
often.
2. Check ice bridge thickness. Proper thickness should be 1/16-1/8’’.
3. Check water level in trough. See troubleshooting for proper water level and adjustment.
4. Clean the condenser to insure unobstructed air flow.
5. Check for leaks of any kind: Water, Refrigerant, Oil, Etc.
6. Check the bin switch for proper adjustment.
7. Check all electrical connections.
3
8. Oil the fan motor if the motor has an oil fitting.
Cleaning and Sanitizing
Harvest problems may occur if the following procedures are not performed every 6 months.
1. Remove the ice machine front panel.
2. Make sure that all the ice is off of the evaporator. If ice is being made, wait for cycle completion,
then turn the machine “OFF” at the selector switch.
3. Remove or melt all ice in the storage bin.
4. Add recommended amount of approved ice machine cleaner to the water trough according to
label instructions on the container.
5. Initiate the clean cycle at the controller board switch by turning on the machine and activating the
switch marked as “CLEAN”. Note: This must be done within 3 minutes of turning the machine
“ON”. Allow the cleaner to circulate for approximately 15 minutes to remove mineral deposits.
6. After 15 minutes (or 30 minutes automatically), stop the process and drain the sump. Refill with
clean water run another 5 minutes and drain again. Fill the trough with fresh incoming water.
7. Terminate the wash cycle at the switch by placing the switch in the “OFF” position. Remove the
splash curtain (if available) and inspect the evaporator and water spillway (the plastic top of the
evaporator) to assure all mineral residue has been removed.
8. If necessary, wipe the evaporator, spillway and other water transport surfaces with a clean soft
cloth to remove any remaining residue. If necessary, remove the water distribution tube,
disassemble and clean with a bottlebrush. Reassemble all components and repeat steps 4 through 7
as required to remove residue.
9. Turn OFF ice machine water supply and clean the water trough thoroughly to remove all scale or
slime buildup. If necessary, remove the water trough to reach all splash areas and float.
10. Prepare 1½ to 2 gallons (5.7 to 7.5 liters) of approved (EPA/FDA) sodium hypochloride food
equipment sanitizer to form a solution with 100 to 200 ppm free chlorine yield.
11. Add enough sanitizing solution to fill the water trough to overflowing and activate the switch to
the “CLEAN” position and allow circulation to occur for 10 minutes and inspect all disassembled
fittings for leaks. During this time, wipe down all other ice machine splash areas, plus the interior
surfaces of the bin, deflector and door with the remaining sanitizing solution. Inspect to insure that
all functional parts, fasteners, thermostat bulbs (if used), etc. are in place.
12. After 3 minutes, stop the process and drain the sump. Refill with clean water run another 5
minutes and drain again. Fill the trough with fresh incoming water.
13. Place the switch to the “ON” position and replace or close the panel. Discard the first two ice
harvests.
How the Ice Maker Works
Refer to the Operation section of the User’s Manual (pages 12 to 14) for a clear description of how
the ice maker makes ice and uses water.
There are 3 systems: the Cooling System, the Water System and the Electrical System.
4
Cooling System
5
ITEM NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DESCRIPTION
Compressor
Discharge tube
Cu three ways
Condenser
Drier and filter
Capillary tube
Connection tube
Hot gas valve
Hot gas tube
Evaporator (Ice Mold)
Fan blade(φ200X28°)
Suction pipe
Motor 5W
Motor 10W
Temperature sensor of the evaporator
Temperature sensor of the condenser
Controller
During the icemaking stage, the hot gas solenoid valve is closed. The hot refrigerant gas is
pumped out of the compressor to the condenser. The hot gas is cooled by fanforced air to cool the
liquid refrigerant after passing through the condenser. The drier and filter reduce possible dirt and
moisture in the refrigerant. The refrigerant expands in the evaporator cooling it so ice will form
while in the presence of water. Low pressure refrigerant gas returns to the compressor from the
evaporator where the cycle continues.
During the ice harvest stage, the solenoid valve is open. The hot refrigerant gas is pumped out of
the compressor to the evaporator through the hot gas valve. As the hot gas is not cooled by the
condenser, the refrigerant warms the evaporator. Ice in contact with the evaporator begins to melt
on the back side. The ice gradually ice slides off of the evaporator and drops to the storage bin.
6
Water System
ITEM NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DESCRIPTION
Water supply tube
Water inlet connector
Nut of water inlet tube
Supporting tube
Water pump inlet tube
Floater valve
Water trough
Water pump
Water pump outlet tube
Ice slideway
Water distribution tube
Evaporator (Ice Mold)
Magnetism switch
Gasket
Screw cap
When the water inlet is connected with the main water supply, water will fill the trough through the
float valve until the water level in the trough closes the valve. During the icemaking stage, water is
pumped from the water trough to the water distribution tube. The distributed water flows over the
7
surface of the cold evaporator where the purest water is converted to ice. The unfrozen water
returning to the trough. At the end of freeze cycle and during harvest, the water dump valve is
opened and the mineral laden remaining water is pumped down the drain.
Wiring Connection :
8
Circuit Description
1. Electrify Status For The First Time
As the icemaker is properly installed. switch on the water tap, let the water trough full (reach on the
level), then turn the Power switch to the ON position on the back panel. The icemaker will start
working automatically
In this status, the time is fixed about 3 minutes. This function is also helpful to protect the
compressor avoiding restart within 3 minutes.
At this status, the White, Green, Yellow and Red LEDs are light together.
2. Ice-making Status
The compressor, motor fan and pump are powered on. The hot gas solenoid valve is powered off.
When this green LED is lit, the unit is working in the ice making mode controlled by a temperature
probe on the evaporator. When the green LED is flashing, the unit is working in the ice making
mode controlled by a fixed timer.
The fan motor is also controlled by a condenser sensor. When the ambient temperature is too lower,
the motor fan stop working for good condensation to refrigerant.
3. Ice Harvest Status
The pump is powered off. The hot gas solenoid valve, compressor and motor fan is powered on.
The fan motor is also controlled by a condenser sensor. When the ambient temperature is too lower,
the motor fan stop working for good condensation to refrigerant.
The Yellow LED indicates the ice harvest status.
4. Ice Full Status And Cold Preservation Stage
If the ice bin is fulfilled with ice, the machine stops making ice and turn to cold preservation stage
automatically.
In this status, the compressor works regularly to keep the lower temperature for lower ice melting.
The rest of the electric components are powered off. The WHITE LED indicates the ice full status
and the GREEN AND YELLOW LEDs together indicates the cold preservation status .
5. Cleaning Status
Turn the machine CLEAN SWITCH at the CLEAN in 3 minutes after the POWER SWITCH is
turned on, the machine turn to Cleaning Status. At this status, the pump is powered on. Compressor,
motor fan and are powered off. The GREEN and YOLLOW LEDs are flashing together. To stop the
cleaning mode, turn the machine “OFF” at the Power switch or it will turned off automatically after
30 minutes.
NOTE: In order to start the Clean Status the power switch must be on. The CLEAN switch must be
turned in 3 before the COMPRESSOR starts. To clean, it is no use turning the CLEAN switch when
machine is in ice-making status or ice-harvest status.
Controller box:
Instructions for LEDs and buttons:
1. White LED: Ice full indicator light.
When this LED is lit, the ice storage bin is full of ice or there is something between the ice-full
sensor and the evaporator. The unit will stop making ice. When ice cubes are taken out of the ice
storage bin making the ice-full probe free, the white LED will keep flashing for 3 minutes. Then the
unit will restart and return to the ice making mode.
2. Green LED: Ice making indicator light.
When this LED is lit, the unit is working in the ice making mode controlled by a temperature probe
on the evaporator. When the green LED is flashing, the unit is working in the ice making mode
controlled by a fixed timer.
3. Yellow LED: Ice harvest indicator light.
When this LED is lit, the unit is working in the ice harvest mode controlled by ice-full probe.
9
When green LED and yellow LED is lit, it means the unit is working in the cold preservation
stage .
4.Red LED: power indicator light.
The power is on when the red LED is lit.
5. Mode button:
Mainly for service. When this button is pressed, it can change from ice making mode to ice harvest
mode, or from ice harvest mode to ice making mode. You can judge the mode from the status of the
green and yellow LEDs.
6. Ice size adjust:
1. Press and hold the “Clean” button and the “Mode” button together for at least 3 seconds. The
unit will enter the Ice Size Adjustment mode. The “ICE” LED (green) will be blinking
continuously during the ice size adjustment.
2. While in the Ice Size Adjustment mode, press the “Clean” button or the “Mode” button for the
desired ice size.
Smaller ice setting:
By pressing the “Clean” button, you can decrease the size of the ice cubes. The “FULL” LED (red)
will flash as you lower the ice size and will finally be blinking at the setting of smallest ice size.
Larger ice setting:
By pressing the “Mode” button, you can increase the size of the ice cubes. The “HARVEST” LED
(yellow) will flash as the larger size is set and will blink when the setting of largest ice size has been
reached.
After 10 seconds without any operation, the unit will automatically memorize the current state and
return to the previous mode.
NOTE: If during the ice size adjustment, the “BIN FULL”, “ICE” and “HARVEST” LEDS blink
all at once, this indicates that the unit is in the default factory setting of the ice size adjustment.
10
Exploding Drawing
11
Item No.
Description
2
Ice scoop
3
Top panel
7
Drain nut
9
Condenser
10
Hot gas valve body (EVU3)
11
Hot gas valve coil(042N4212)
Compressor
16
17
18
22
Compressor starting device component
Water trough
23
Floater valve
water inlet pipe screw
24
Drain valve
25
Water out tube of pump
26
Water pump
27
Water inlet
28
Condenser sensor
29
31
Evaporator sensor
32
Evaporator (Ice Mold)
33
Ice slideway
35
Wiring harness
36
Magnetism switch
38
Power plug
41
EBM motor 5W
42
43
Fan blade (φ200X28°)
EBM motor 10W
49
Power switch
50
Clean switch
51
Under louver
52
Door
54
Locked screw(Block screw)
55
Foot
57
Drier
60
15A fuse of controller
61
Control box
Water sprinkler
12
Troubleshooting
ELECTRICAL SHOCK HAZARD
Disconnect Electrical Power Before
Beginning Removal of Parts
Before Maintenance
1. Be sure the electrical supply is 115 VAC, 60Hz, 15A and is properly grounded to protect
maintenance personnel against electrical shock.
2. Are any electrical leads loose? Danger of short circuit? If so, disconnect power.
Basic Troubleshooting
Some problems can be pinpointed through the service technician’s senses of hearing, sight and
touch. Examples are listed below.
Listen
Listen to the user’s description of how the ice maker was operating, especially the depiction of
unusual phenomena. Ask how the unit was operating before the user called for service and try to
deduce the defect from the comments.
Does the machine sound normal when it is running (like a window air conditioner)?
Look
Check the cooling system tubing, especially the welded joints. If some oil can be seen, the gas
may be leaking resulting in less than the normal amount of ice is being produced.
Is the cycle of the icemaking and ice harvesting normal (Does water run, is the fan running and
is the evaporator getting cold enough)?
Check the water system especially at the connections. Are there any water leaks?
Check the flow of water through the water filter and if not, replace the water filter.
Check if the ice maker was installed according to the user’s manual (level and air space).
Inspect the ice maker to see if it needs to be cleaned. Please note, cleaning a dirty ice maker is
not a warranty repair!
Feel
Touch the tubing at the evaporation weld, feeling the temperature. During the icemaking stage,
it should feel cold. During the ice harvest stage, it should feel hot.
If appropriate, touch the capillary tube or TXV tubing (near the drier). It should feel warm
during the ice making stage.
Troubleshooting Guide
This troubleshooting guide in the user manual should be read before this guide. Be sure only when
the trouble shooting in user manual can’t help you solve the problem, turn to this guide.
Troubleshooting Guide
13
14
15
16
17
18
Adjustment and Replacement
Replace Control box, fuse and the sensor of temperature
ELECTRICAL SHOCK HAZARD
Disconnect Electrical Power Before
Beginning Removal of Parts
Replacing Control Box Fuse and Temperature Sensor
Remove the rear cover and the louvered front panel or the side panel on a modular unit.
Locate the electronic control box in the unit.
Carefully pull out the temperature sensors (one at the evaporator, another at the condenser).
Loosen the screws holding the control box, replace with a new one. Reverse the foregoing steps
to reassemble.
If you need to replace the fuse, open the front panel of the control box and you will find this
figure:
If you need to replace a temperature sensor, pull out the sensor, open the panel of the control
box, pull out the other end of the sensor, replace with a new one. Reverse these steps to reassemble.
Replacing the water pump
Disconnect electrical power.
Remove the front cover.
Unplug the lines connected with the water pump, including the water outlet tube of the pump.
Loosen the screws. Replace the pump with a new one.
Reverse the above steps to reassemble.
Replacing the cooling system components
To replace the condensing components, see the Cooling System figure.
1. Replacing the compressor and the compressor kit (includes relay, thermal protect)
If only the compressor kit needs to be
replaced, remove the top panel and left
panel, locate the compressor, take off
the clip, replace the defective
components.
Reverse the above steps to reassemble.
ELECTRICAL SHOCK HAZARD
Disconnect electrical power before
beginning removal of parts.
If the compressor needs to be replaced, remove the top cover and locate the compressor.
Unplug lines and remove ground line, open the Process/Suction, evacuate refrigerant, take out
compressor, replace with a new one, join together, then recover refrigerant, weigh in the charge on
the nameplate.
Reverse the above steps to reassemble.
2. Replacing the fan motor and fan blade
Remove the top and right panels.
Locate the fan motor, unplug the lines connected with the fan motor, loosen the screws of the
holding bracket and fan motor bracket, remove the damaged unit and replace with a new one.
Reverse the above steps to reassemble.
19
3. Replacing the hot gas valve, drier and evaporator
Remove the top panel.
Locate the drier and hot gas valve, open weld, replace the drier and hot gas valve, weld, recover
refrigerant, evacuate and weigh in the charge on the nameplate.
Reverse the above steps to reassemble.
If needed, replace the evaporator.
Remove the front and top panels, locate the evaporator, open the Process/Suction, open the two
welds, replace with a new evaporator. Recover refrigerant, evacuate and weigh in the charge on the
nameplate.
Reverse the above steps to reassemble.
ADVANCED COMPONENT TROUBLESHOOTING TECHNIQUES
Refrigeration System
Refrigerant Cycle and Components
Before diagnosing the refrigeration system, it is very important that the refrigeration charge be
correct. Whenever the refrigeration system has been opened, the filterdrier must be replaced and the
proper refrigerant charge must be weighed in.
Refrigerant Pressures
The suction pressure at the beginning of the freeze cycle can vary +/10 psi (.7 bar) depending on
operating conditions. Pressures less than this may indicate an undercharge. The discharge pressure
on air cooled units will vary with ambient conditions.
Refrigerant in a gas state is pumped throughout the refrigeration system by a hermetic compressor
to the condenser. Heat is removed from the refrigerant either by forced air movement through an
aircooled condenser or transferring heat from the refrigerant to water through a watercooled
condenser. The refrigerant changes to a liquid when cooled. The refrigerant in a liquid state passes
through a filter drier.
The filter drier traps small amounts of moisture and foreign particles from the system. The filter
drier must be replace whenever the refrigeration system is opened or if the refrigerant has been
completely lost.
Compressor
The compressor runs during the entire cycle. If the valves in the compressor are damaged, the
compressor will be unable to pump refrigerant efficiently. Damaged valves may be the result of
another problem in the refrigeration system such as liquid refrigerant returning to the compressor or
high head pressure. When a compressor is replaced it is important that the refrigeration charge be
weighed in and the system checked for proper operation to prevent a repeat failure.
An inefficient compressor will usually have a higher than normal suction pressure at the end of the
cycle. The freeze cycle will be longer than normal and/or the harvest cycle may be excessively long.
Check the compressor amperage draw 5 minutes into the freeze cycle. If the amp draw is less than
70% of rated full load amps, the compressor may be inefficient. These symptoms may also be
caused by other problems, therefore it is important to use the troubleshooting charts when
diagnosing a problem.
The air condenser is located in the back of the cabinet. Air is pulled through the condenser by a fan
motor and discharged through the right hand side panel. The Undercounter air intake and discharge
is through the front panel.
Do not block airflow as it will cause premature failure of the machine and will void the
warranty.
20
Compressor Check
Compressor and Start Components
The compressor should run during the entire cycle. If the machine is in the ON position but the
compressor is not running, check the compressor contactor to see if it is engaged. If the contactor is
not engaged, the problem is not with the compressor or the compressor start components. If the
contactor is engaged and there is correct voltage through the contactor, there could be a problem
with one of the starting components or the compressor. It is recommended that the compressor
starting components be replaced when replacing a compressor.
DISCONNECT POWER BEFORE SERVICING!
If the compressor uses an internal overload, be certain that the compressor has cooled and the
overload has reset before diagnosing the compressor. If the compressor is cool and is still not
running, check the compressor motor windings by first removing the wires at the compressor
terminals. With an ohmmeter, check for continuity between all three terminals, if an open circuit
exists between any of the terminals, the compressor may need to be replaced. Check for continuity
from each terminal to the compressor body, if continuity is found from any terminal to the
compressor body, the compressor windings are shorted to ground and the compressor will need to
be replaced. If the compressor appears to be good at this point, it is advisable to use a compressor
analyzer to isolate the compressor from the start components while checking for a locked rotor. If
an analyzer is not available, the compressor starting components must be checked.
If all starting components are good, check the amperage draw from the common terminal of the
compressor, making sure proper voltage is supplied to the compressor and all wiring is properly
connected. If the compressor does not start and there is excessive amperage draw, (see locked rotor
amps on compressor tag) the compressor has a locked rotor and should be replaced.
Overload (External)
If there is no amperage draw check the compressor overload. The compressor overload can be
checked for continuity after removing it from the compressor and letting it cool to room
temperature. If there is no continuity between the two terminals, replace the overload. If the
overload is suspected of opening prematurely, it should be replaced with an overload, which is
known to be good.
Capacitors
The start capacitor is an electrical storage device used to provide starting torque to the compressor.
If a start capacitor is defective, the compressor will not start properly. The run capacitor is an
electrical storage device used to improve the running characteristics and efficiency of the
compressor. Before checking a capacitor, it should be discharged by shorting across the terminals.
If a run or start capacitor is cracked, leaking or bulging it should be replaced. If a capacitor is
suspected of being defective, it can easily be checked by replacing it with a capacitor of the correct
size, which is known to be good. If the compressor starts and runs properly, replace the original
capacitor. A capacitor tester can also be used.
Start Relay
The start relay breaks the electrical circuit to the start windings when the compressor motor speed
increases. If the relay is defective, the compressor will not start or it may start but will run for a very
short time.
A compressor relay can be checked by removing the relay and checking the relay contacts for
damage and check for continuity across the closed relay points. Check the relay coil with an
ohmmeter. If no continuity is read, replace the relay.
Other Components
21
Thermostatic Expansion Valve (TXV)
The thermostatic expansion valve meters the flow of refrigerant into the evaporator changing its
state from a highpressure liquid to a lowpressure liquid. This drop in pressure causes the refrigerant
to cool. The cooled refrigerant absorbs heat from the water circulating over the evaporator. As the
evaporator fills with liquid refrigerant, the evaporator becomes colder.
The flow of refrigerant into the evaporator is controlled by the temperature at the outlet of the
evaporator. The expansion valve bulb, mounted to the top of the suction line, senses the evaporator
outlet temperature causing the expansion valve to open or close. As ice forms on the evaporator, the
temperature drops and the flow of refrigerant into the evaporator decreases, resulting in a drop in
suction pressure.
The evaporator should become completely flooded (filled with liquid refrigerant) during the freeze
cycle. A completely flooded evaporator will have a uniform freeze pattern (ice formation across the
evaporator).
A starved evaporator (not enough liquid refrigerant) will have poor or no ice formation at the top of
the evaporator, and the tube(s) exiting the evaporator will not frost. All tubes should be frosted
approximately 5 minutes from the start of the freeze cycle.
An expansion valve that is restricted or not opening properly will starve the evaporator resulting in
lower than normal suction pressure. A low refrigerant charge will also starve the evaporator and
cause low suction and discharge pressures. If not sure of the amount of charge in the system, the
refrigerant should be recovered and the correct charge be weighed in before a defective valve can be
diagnosed.
If the evaporator is starved but the suction pressure is higher than normal, the TXV is not the
problem, refer to the troubleshooting section. If the TXV sticks open or if the thermal bulb is not
making good contact with the suction line, the flow of refrigerant into the evaporator will be too
great and liquid refrigerant will flood the compressor. The suction pressure will remain higher than
normal and the machine will remain in an extended freeze cycle. Ice will build evenly but will be
very thick.
Hot Gas Valve
When the machine enters harvest the hot gas valve coil is energized opening the hot gas valve.
Discharge gas is pumped through the hot gas valve directly into the evaporator. The evaporator
temperature will reach approximately 40°F (4.5°C). The suction pressure during harvest should be a
minimum of 70 psi (4.8 bar) for R404a units or 50psi (3.4 bar) for R134a units. The discharge
pressure will drop during harvest.
If the hot gas valve does not completely open during harvest, there will not be enough hot gas in the
evaporator to defrost the ice. If there is not enough hot gas entering the evaporator, the suction
pressure will be lower than the above stated pressures. It is important when making this check that
the machine has the proper refrigerant charge, normal head pressure and the compressor is
22
functioning properly. If the hot gas valve leaks during the freeze cycle, ice will not form on the top
of the evaporator and suction pressure will be higher than normal. To check if the hot gas valve is
leaking, let the machine run in the freeze cycle for approximately 5 minutes. Now feel the
temperature between the inlet and outlet of the valve. A definite temperature difference should be
felt. If the lines are the same temperature and the suction pressure is higher than normal; the valve is
leaking and should be replaced.
Evaporator
As water is circulated over the front of the evaporator, liquid refrigerant is circulated through the
tubing attached to the back of the evaporator. As the liquid refrigerant in the tubing vaporizes, it
absorbs heat from the water causing the water to freeze. The evaporator should be completely
flooded throughout most of the freeze cycle. A flooded evaporator will build ice evenly across the
evaporator. A starved evaporator will have thick ice at the bottom and thin ice at the top. Most
problems with ice formation or harvesting are not related to a defective evaporator.
If the evaporator is flooded but not building ice evenly, it is possible the evaporator has coil
separation. Evaporator coil separation is the separation of the refrigerant tubing from the back of the
evaporator plate. This is very rare but occasionally occurs. The symptoms of coil separation are low
suction pressure, ice not releasing from the evaporator during harvest and hollow cubes or uneven
ice bridge on some areas of the evaporator.
If coil separation is suspected, let the machine run in freeze until the timer has energized. Check the
evaporator for areas where cubes are less developed than cubes in other areas. If the cubes are all
the same size, coil separation is not the problem. If there are areas other than the top row with less
developed cubes, check the refrigerant lines at the inlet(s) and outlet(s) of the evaporator, if both
lines are frosted the coil is separated. To confirm coil separation, remove and check the back of the
evaporator. If the coil is separated, the evaporator must be replaced. If the outlet(s) of the
evaporator is not frosted, the problem is not with coil separation (refer to Troubleshooting).
Note: Permanent discoloration of the evaporator plating is normal and will cause no problems with
harvesting the ice or sanitary conditions. Before condemning the evaporator for plating problems,
be certain it is not just discoloration. Good evaporators will not be covered under warranty. If the
spillway (plastic evaporator top) becomes damaged, it can be replaced. It is not necessary to replace
the entire evaporator.
As liquid refrigerant leaves the evaporator, it changes to a lowpressure gas before returning to the
compressor. Liquid refrigerant must not return to the compressor or damage will result. Frost on the
suction line at the inlet of the compressor indicates liquid returning to the compressor. Check for
frost at the end of the freeze cycle. If liquid is returning to the compressor, the problem must be
located and corrected. See Refrigerant Charge, Thermostatic Valve and Evaporator.
Refrigerant
Refrigerant in a highpressure liquid form is fed to an expansion valve where the refrigerant is
reduced to a lowpressure liquid. Under this low pressure, the liquid will absorb heat from the
evaporator causing the liquid to change to a vapor. This vapor is the drawn into the compressor
23
where the temperature and pressure of the vapor are increased. The high temperature, high pressure
vapor flows to the condenser where the heat is removed, causing the vapor to return to the liquid
form, making the refrigerant ready to flow back to the evaporator to pick up more heat. ice machine
use R134a or R404a refrigerant. Always check the serial number data plate for the proper type of
refrigerant and the amount used in the machine you are servicing.
R404a and R134a are both HFC refrigerants, which result in no ozone depletion factor. R404a
cylinders are orange in color, R134a cylinders are light blue in color. Do not switch refrigerants in
the machine.
Important: When discharging refrigerant from an icemaker, recover as much of the
refrigerant as possible with a recovery device or some other means to prevent the refrigerant
from entering the atmosphere.
Electronics and Sensors
Control Board Checks
Timer Initiate
The timer initiate is a temperature sensor mounted on the liquid line to the evaporator. When the
sensor detects the correct low temperature the freeze timer is energized and the machine enters the
timed portion of the freeze cycle. When the freeze timer is energized, the machine is in the timed
portion of the freeze cycle. When the machine enters harvest, the temperature rises, but the amount
of time the machine is in harvest is predetermined and is controlled by the Controller Board. Once
the time has passed, the machine will enter the harvest cycle. The timer is not adjustable, but the
temperature at which the timer is initiated is adjustable as is outlined below.
Adjustments
Ice size adjust
1. Press and hold the “Clean” button and the “Mode” button together for at least 3 seconds. The
unit will enter the Ice Size Adjustment mode. The “ICE” LED (green) will be blinking continuously
during the ice size adjustment.
2. While in the Ice Size Adjustment mode, press the “Clean” button or the “Mode” button for the
desired ice size.
Smaller ice setting:
By pressing the “Clean” button, you can decrease the size of the ice cubes. The “FULL” LED (red)
will flash as you lower the ice size and will finally be blinking at the setting of smallest ice size.
Larger ice setting:
By pressing the “Mode” button, you can increase the size of the ice cubes. The “HARVEST” LED
(yellow) will flash as the larger size is set and will blink when the setting of largest ice size has been
reached.
After 10 seconds without any operation, the unit will automatically memorize the current state and
return to the previous mode.
24
Bin Control Operation
The bin control is used to shut the machine off when the bin fills with ice. The bin control must be
checked upon installation or initial startup and when performing maintenance. Adjustments are
notcovered under warranty.
There is one bin switch for each evaporator. The actuator arm of the bin switch comes in contact
with the splash curtain. When the bin is full of ice, the splash curtain is held open when ice drops
off of the evaporator. This releases the pressure of the bin switch actuator arm allowing the switch
to open.
Undercounter and machines without curtains: An ice slide at the bottom of the evaporator is
used on all undercounter and some modular units. The slideway swivels up and down and has a
magnetic reed switch which detects its position. When ice is sitting on the control, the slideway
faces down indicating that ice is present (and disconnecting the circuit from the reed switch). When
the ice is removed, the slideway swivels up and the connection is completed allowing the machine
to begin producing ice again.
Bin Control Adjustment
All Models (except those without curtains): Check the bin switch for proper adjustment by
swinging the bottom of the curtain away from the evaporator. Slowly bring the curtain towards the
evaporator. The switch should close when the bottom edge of the curtain is even with the outer edge
of the water trough. Adjust the switch by loosening the screws the hold the switch in place. Move
the switch to the proper position and retighten the screws. Recheck the adjustment. Adjustments
are not ncovered under warranty.
Undercounter Models or Those Without Curtains
There are no adjustments needed for the bin (magnetic reed) switch.
Spare parts list
ITEM
NO
CODE
ENGLISH DESCRIPTION
2
1864800100
Ice scoop
3
1860010800
Top panel
7
1861530802
Drain nut
9
1880013104
Condenser
10
1854703700
Hot gas valve body (EVU3)
11
1854702700
Hot gas valve coil(042N4212)
16
1858420900
Compressor
17
1858441300
1864802003
Compressor starting device component
Water trough
18
25
22
Floater valve
23
1880001701
1864529100
24
1854700800
Drain valve
25
1864512101
Water out tube of pump
26
1858904400
Water pump
27
1864526600
Water inlet
28
1851700700
Condenser sensor
29
31
1851701002
Evaporator sensor
1864550603
Water sprinkler
32
1880024701
Evaporator (Ice Mold)
33
1861701802
Ice slideway
35
1853703602
Wiring harness
36
1854005700
Magnetism switch
38
1853110500
Power plug
41
1858200601
EBM motor 5W
42
1860700100
Fan blade (φ200X28°)
43
1858201300
EBM motor 10W
49
1854000500
Power switch
50
1854000700
Clean switch
51
1860210400
Under louver
52
186480690L
Door
54
1803200100
Locked screw(Block screw)
55
1880014901
Foot
57
1880008300
Drier
60
1854800300
15A fuse of controller
61
1854202400
Control box
water inlet pipe screw
26
Download PDF

advertising