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Condenser Fan Motor on the air-cooled versions. The high Pressure Control is manual reset with the reset button at the on the rear of the
machine and a monitoring Red LED on the Front Console Panel.
7.9 Water Regulating Valve (water-cooled models only).
The water Regulating Valve function is to maintain a constant Compressor head pressure by regulating the amount of water flowing through
the condenser, on water-cooled models. The valve operates through the refrigeration system high-pressure side. Rotating the adjusting
screw, located at the top of the valve, will Increase or Decrease the water flow through the water-cooled condenser, which in turn will
Decrease or Increase the Compressor operating head pressure.
7.10 Water Distribution System.
The Water Distribution System functions to evenly supply water to all of the cells of the evaporator plate. The water is pumped from the water
reservoir to the distributor, above the evaporator, through the holes and flows over the ice moulds. Gravity returns the unfrozen water to the
reservoir for recirculation.
7.11 Water Drain Solenoid Valve.
The Water Drain Solenoid Valve functions in conjunction with the water pump to flush-out the reservoir assembly at the beginning (first 40
seconds) of every harvest cycle. This action cleans-up and rinses the reservoir during each harvest cycle preventing dangerous water
mineral concentration.
7.12 Thermostatic Expansion Valve.
The Thermostatic Expansion Valve regulates the flow of refrigerant to the evaporator and reduces the pressure of the liquid refrigerant from
condensing pressure to evaporating pressure.
7.13 Water Pump.
The water pump primes the water from the reservoir to the distributor tube and through the holes (in the distributor) it cascades over the
evaporator moulds by gravity to be frozen into clear ice cubes. The water pump remains OFF during the first 30 seconds of the freezing
cycle whilst it continues to run for the first 40 seconds of the defrost/ harvest cycle to drain the remaining water in the reservoir.
7.14 Water Inlet Solenoid Valve (male fitting).
The P.C. Board energises the Water Inlet Solenoid Valve during the beginning of the freezing cycle until the water reaches the maximum
level in the reservoir (controlled by the Water Level Sensor).
After 3 minutes, from the start of the freezing cycle, the Water Inlet Valve is energised again for a short period to re-fill the reservoir to the
maximum level to minimise the possibility of slush ice forming.
A flow control is fitted in the feed pipe to reduce the pressure of the water.
7.15 Water Level Sensor.
The Water Level Sensor, located in the upper right side of the reservoir, works in conjunction with the P.C. Board in order to control the water
level at the beginning of the freeze cycle by receiving a low power current through the water. When the current reaches the P.C. Board the
water inlet solenoid valve is de-energised.
If the P.C. Board doesn’t receive any signal from the Water Level Sensor within the first 3 minutes of the freeze cycle the P.C. Board trips
OFF the operation of the machine with the switching ON of the two Red LED’s blinking slowly.
8. Wiring Diagram - F200 & F300
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M = brown
bc = light blue
gv = yellow green
b=white
n = black
r=red
a = orange
A - Input terminal board
B - Compressor contactor
C - Compressor
D - Ice sensor
E - End defrosting switch
F - Water level sensor
G - Condenser temperature probe
H - Led card
I - P.C. Board
J - HI pressure switch
K - Manual/Automatic reset jumper
L - Water pump
M - Water inlet valve
N - Water drain/purge valve
O - Hot gas valve
P - Fan Motor
(only AIR cooled unit)
Q - Fan Motor
(only WATER cooled unit)
RC - Compressor relay
CS - Start capacitor
CM - Run capacitor
F200 - F300 Wiring Diagram
220V 50Hz 1ph
8.3 Compressor Contactor
Located in the control box, the compressor contactor functions is to carry the compressor line current. The contactor is wired to receive
power from the ICE/OFF/WASH switch through the P.C. Board.
8.4 Ice Thickness Sensor
Located in the front upper right side off the evaporator, the sensor is made with two metal reeds in which passes power at low voltage. The
two metal reeds, which are individually insulated, are set, through a setting screw, to maintain a minimum clearance from the evaporator
(7mm) Once ice is formed into each mould and is thick enough to fill-up that minimum clearance existing between the two sensor reeds, and
the evaporator, the water that cascades over the ice has gradually increased to make contact between the two sensor reeds.
Contact remains there for about 6 seconds the P.C. Board receives the signals to put the ice machine on defrost.
8.5 N.C. Microswitch/Magnetic Switch
Signalling the ice cubes release. Located in the upper left side corner of the evaporator, this low voltage switch - single pole/single throw -
mechanically operated by the evaporator deflector actuator, signals to the P.C. Board the end of the defrost cycle and to re-start a new
freezing cycle. The swinging motion, to which the ice deflector is subject to when the ice cubes drop into the bin below, causes the deflector
actuator to press (open the contact) and the release (close the contact) microswitch plunger. This OFF and ON situation of the N.C. contact
is enough to signal to the P.C. Board that the timed defrost cycle is over. On later models the sequence is controlled by a magnetic switch
attached to the bottom right hand side of the deflector.
If the bin is full of ice, the evaporator deflector will be left in the open position by the last batch of released cubes. This means that the
deflector actuator will keep the N.C. microswitch plunger pressed,or the magnet and switch separated, as long as the deflector remains in
open position.
If the N.C. contact are open for more that 30 seconds, the switch signals to the built-in time delay of the P.C. Board to turn the unit OFF
NOTE: In case the Interface P.C. Board does not receive the second pulse from the microswitch/magnetic switch, after 30 to 32
seconds from the first pulse, it will send a signal to the main Board, to switch the unit from defrost to freezing cycle.
It is possible to vary the maximum waiting time for starting a new freezing cycle after the pulse sent by the first switch, by
adjusting a ‘trimmer’. The waiting time variation ranges from 22 to 45 seconds.
8.6 Hot Gas Solenoid 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 thermostatic expansion valve, for direct flow to the Evaporator Platen Assembly to release ice cubes from the ice cube
moulds.
The Hot Gas Solenoid Valve is comprised of two parts - the Body/Plunger and the Coil assemblies. Installed in the discharge line of the
Compressor, the energised solenoid coil liffs the valve stem within the valve body to cause the hot discharge gas to be diverted when the ice
Thickness sensor has signalled to the P.C. Board to start the Harvest Cycle.
8.7 High Pressure Fan Control - Air Cooled Models
A reverse acting automatic reset, high pressure control is electrically connected to the two condenser fan motors and by a capillary tube to
the liquid line.
Its function is to maintain the head pressure during the freezing cycle between the preset values and the head pressure during the harvest
cycle ensuring sufficient heat to release the cubes from the cube moulds.
The control contacts are set to open at 13 bar cutting off the electrical power supply to the fan motors and to close at 15 bar.
8.8 High Pressure Control - Water Cooled Models
The High Pressure Control, a safety control, is factory set to cut-out, at 20 bar and cut-in at 13 bar. The control functions as a precautionary
device to shut OFF electrical power to the Ice maker, should a loss of water occur to the water cooled Condenser. In addition to being a
manually reset Control, there is an adjusting screw for raising or lowering the CUT-IN pressure.
8.9 Water Regulator Valve - Water Cooled Models
The Water Regulator Valve functions maintain a constant Compressor head pressure, by regulating the amount of incoming water flowing
through the Condenser, on water-cooled models. The valve operates through the refrigerant system high side pressure.
Rotating the adjusting screw located on top of the valve, can INCREASE or DECREASE the water flow through the water-cooled Condenser,
which in turn, will DECREASE or INCREASE the Compressor operating head pressure.
8.10 Water Distribution System
The Water Distribution System functions is to evenly supply water to all cells of the evaporator plate. The water pump pumps water from the
sump to the tee.
From there water is channelled through the vertical tygon tube to the water distributors, above the evaporator plate, and from the holes in the
distributor tube water flows to the cells on one side of the evaporator plate.
Gravity flow returns the unfrozen excess portion of water to the sump reservoir for recirculation.
8.11 Water Outlet Solenoid Valve
The Water Outlet Solenoid Valve functions in conjunction with the water pump to flush-out the sump assembly at every harvest cycle.
This action cleans-up and rinses the sump during each harvest cycle preventing dangerous water mineral concentration.
8.12 Thermostatic Expansion Valve - TXV
The Thermostatic Expansion Valve regulates the flow of refrigerant to the evaporator and reduces the pressure of the liquid refrigerant from
condensing pressure to evaporating pressure.
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