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7. Component Description
7.1 Front Console Panel
Power On.‘Green’. Bin Full/ Washing. ‘Amber’. High Pressure. ‘Red’.
Machine in Operation ‘Green’. Alarm ‘Red’. Reset / Washing. ‘Push Button’.
7.2 P. C. Board.
Located in the control box, this board is the brain of the system as it governs the ice machine cyclematic through sensors, relays and
switches. It consists of two separated printed circuits one at high and the other at low voltage integrated with a fuse, four connectors for the
sensors/ switches. (Condenser sensor – BLACK-, Magnetic switch- GREEN-, ice thickness sensor- RED-, water level Sensor- BLUE), two
jumpers (one J1 for factory use only – and the second J2 for the selection between manual or automatic reset mode). One outlet connector
(front LED display- BLACK ), one serial port connector (BLACK) and four plug in terminals for input and output power. With J2 closed the
P.C. Board is set up for Manual reset mode. When J2 is open the P.C. Board is set up for Automatic Reset mode.
The P.C. Board includes a electronic safety timer that turns on the unit automatically to the defrost cycle when the freeze cycle is longer than
30 or 40 minutes and trips off the unit when the defrost cycle is longer than 3 minutes and 30 seconds (red alarm LED on).
A trimmer, located close to the transformer, can be used to change the current received from the Ice Thickness Sensor in relationship to the
Electrical Conductivity of the water.
7.3 Compressor Contactor.
Located in the control box, the compressor contactor function is to carry the compressor line current. The contactor is wired to receive power
from the P.C. Board.
7.4 Ice Thickness Sensor.
Located in the front upper right side of the evaporator, the sensor is constructed of two metal reeds through which passes current at a low
voltage. The two metal reeds, which are individually insulated, are set, through a setting screw, to maintain a minimum clearance from the
evaporator (3 to 6mm). Once ice is formed in the moulds plus sufficient to bridge the minimum clearance between the two sensor reeds and
the evaporator, the water flowing over the evaporator makes contact between the two sensors. If contact is made for 10m seconds the P.C.
Board receives the signal and starts the defrost cycle.
7.5 Magnetic Switch.
Located in the plastic deflector plate, in front of the evaporator, the switch sends a pulse to the P.C. Board which switches the machine back
into the freezing cycle.
7.6 Hot Gas Valve
The Hot Gas Solenoid Valve functions only during the Harvest Cycle, to divert the Hot Discharge Gas from the Compressor, bypassing the
Condenser and Expansion Valve, for a direct flow to the Evaporator to release the ice cubes from the moulds.
The Hot Gas Solenoid Valve is comprised of two parts, the Body and Plunger and the Coil Assembly. Installed in the discharge line from the
compressor, the energised coil lifts the valve stem within the body to cause the hot gas to be diverted when the ice Thickness Sensor signals
the P.C. Board to start the Harvest Cycle.
7.7 Condenser Temperature Sensor.
The condenser temperature sensor probe (located in contact with the condenser coil) detects the condenser temperature variations and
signals them to the P.C Board at low voltage.
In the air cooled versions, in relation to the different current received, the microprocessor of the P. C. Board supplies, through a TRIAC, the
power at high voltage to the condenser fan motor to cool the condenser and reduce the temperature.
If the condenser temperature rises and reaches 65°C (150°F) the current passed to the micro processor is such to cause an immediate and
total stopping of the operation with the blinking of the Red Alarm LED.
7.8 High Pressure Control.
The High Pressure Control, safety control, is factory set to cut out at 30 bar and cut in at 22 bar. The control functions as a precautionary
device to shut OFF electrical power to the machine should a loss of water occur, to water-cooled machines condenser, or the failure of the
920
9. Removal and Replacement Procedures
WARNING Be sure the electrical power supply circuit breaker and the inlet water supply are OFF, BEFORE starting any of the
following REMOVAL AND REPLACEMENT procedures as a precaution to prevent possible personal injury or damage to equipment.
9.1 Water Pump
1. Remove front panel.
2. Remove front interior metal strip.
3. Unplug pump.
4. Remove one screw holding pump bracket to reservoir right side.
5. Pull pump forward and lift up.
6. Remove discharge hose from pump outlet.
Reverse to replace.
9.2 Reservoir
1. Close water valve on water supply line.
2. Perform above steps and remove water pump.
3. Remove reservoir drain plug and flush reservoir out.
4. Remove the float valve from the reservoir.
5. Remove screws securing reservoir.
6. Liff-up and pull forward to remove reservoir.
Reverse to replace.
9.3 Distributor/Water Tube
1. Remove front panel.
2. Locate water distributor at the top of the evaporator.
3. Pull distributor forward to unsnap it from its holding clamps.
4. Remove hose clamp and water hose.
Reverse to replace.
9.4 Outlet Water Valve
1. Remove front and right side panel.
2. Unplug water valve.
3. Remove clamp securing outlet tube to valve.
4. Remove hose clamp and hose from inlet fitting.
5. Remove two screws and nuts securing valve to its metal bracket and remove valve.
Reverse to replace.
9.5 Compressor
1. Remove top panel (if possible), front panel, leff side service panel and left fan motor shroud.
2. Store refrigerant charge in liquid receiver.
3. Disconnect electrical lines from compressor.
4. Isolate parts to be opened from the rest of the system.
5. Remove compressor mounting bolts.
Reverse to reassemble.
NOTE: Always install a replacement drier any time the sealed refrigeration system is opened. Do not replace the drier until all
other repair or replacement has been completed.
9.6 Condenser - Air Cooled
1. Remove both side panels and remove screws of condenser bracket.
2. Store most of refrigerant charge in liquid receiver.
3. Isolate parts to be opened from the rest of the system.
4. Cut or unsweat liquid and discharge lines.
5. Unbolt and remove condenser from unit rear side.
Reverse to reassemble.
9.7 Condenser - Water Cooled
1. Shut-off water.
2. Remove front and left side panels.
3. Store most of refrigerant charge in liquid receiver.
4. Isolate parts to be opened from the rest of the system.
5. Unsweat water and refrigerant lines.
6. Unbolt and remove condenser.
Reverse to reassemble.
9.8 Hot Gas Valve
1. Remove front, right side panel and right fan motor shroud.
2. Unplug hot gas valve.
3. Purge system of refrigerant.
4. Cut or unsweat valve, remove from machine.
5. To replace, heat sinking the valve is CRITICAL. Wrap the replacement valve in wet rags, and sweat into place. Leave rags on until joints
cool.
Reverse steps 3-1 to reassemble.
9.9 Removal and Replacement of the Drier
To remove the drier:
1. Remove front and left side panel.
2. Remove screws and remove left side fan motor shroud.
3. Store most of the refrigerant charge in liquid receiver.
4. Unsolder refrigeration lines at both ends of the drier and remove the drier.