Components - Compressor
The compressor is identified as M1 and in the cabinets it is located under the cell.
In the 051 and 081 models, the compressor is normally of the single-phase hermetic type, while in the models starting from 121 it is normally of the three-phase semi-hermetic type.
While the cabinets have the internal compressor and the remote unit is optional, for the cells the remote unit is standard
Warning: the compressor needs a certain amount of time between two start-ups and it may happen that when a cycle starts, it does not start immediately.
Components - Capacitor
The condenser, located downstream of the compressor, has the function of cooling the hot refrigerant fluid and bringing it to complete liquefaction.
The condenser can be air or water; Water-cooled models are much smaller and quieter but need considerable amounts of cold water
Warning: In hot environments, lack of ventilation and obstruction of the air filter or water that is too hot, performance can be severely reduced.
Components – Expansion Valve
The expansion valve has the task of regulating the amount of liquid that must evaporate and is back-operated.
The expansion valve, to be more accessible, is located in the component compartment immediately after the dehydration filter; It has a capillary tube to detect the evaporation temperature placed under the insulation and is insulated.
Warning: In case of replacement, refer to the instructions and the sticker that shows the calibration instructions.
Components - Evaporator
The evaporator is the main component and is enclosed in a casing that also encloses the evaporator fan(s) and the heating elements.
The evaporator, thanks to the evaporation of the refrigerant fluid, absorbs energy (heat) from the food through the air flow generated by the evaporator fans which are controlled by the base board
Warning: The evaporator must be free of ice; It is recommended to defrost every two felling cycles.
Fans – Condenser Fan
The air cooled condenser fan is identified as M2 in the diagrams, and there may be one or two fans depending on the model.
The condenser fan is controlled by terminal 28, connector D2 and starts with the compressor.
Warning: in air-cooled condensing units, the two fans can be controlled separately to modulate the condensing action.
Fans – Evaporator Fan
The evaporator fan is identified as M3 in the diagrams, and there can be 1 to 3 fans depending on the model.
The evaporator fans are controlled by the G1 baseboard through a 0÷10VDC signal on terminals 31-32, connector D5. The fan has an internal speed regulator and the fan power comes from L1.
Warning: In the event of a fault, the temperature may not drop/rise as expected.
Valves – Liquid Valve
The V1 liquid solenoid valve shuts off the flow to the evaporation valve.
It is present in all devices with a remote unit and in models 121, 122 and 161.
V1 is controlled by O15, D16 connector and is activated in parallel to the M1 compressor with a delay managed by parameter; When the compressor is stopped, the valve is automatically deactivated.
Valves – Humidification Valve
The V2 liquid solenoid valve brings water to the nozzle on the evaporator to increase the humidity during cooking.
Present in all NEO appliances, once deactivated, the solenoid valve allows the water to flow towards the drain system to empty the circuit.
V2 is controlled by O12, D12 connector.
Warning: The maximum pressure is 330KPa. In this case, leaks and leaks are possible and are collected by the exhaust system; Connect the exhaust system.
Valves – Hot Gas Valve
The V3 liquid solenoid valve intercepts the flow of compressed, hot gas, and directs it towards the evaporator to manage the defrosting and drying cycles.
It is present in all appliances from model 121.
V3 is controlled by O19, D11 connector.
Valves – Pressostatic valve
The pressostatic valve, present only in water-cooled units, has the task of modulating the water flow according to the pressure/temperature in the condenser to which it is connected by a capillary.
Supply pressure range 150 ÷ 500 KPa; Condensing pressure control 1300÷1500KPa
Warning: The water flow is indicated by the arrow on the valve body; The capillary must be sealed to prevent refrigerant gas leakage
Probes – Cell Probe
The B1 cell/air probe measures the temperature of the airflow reaching the product in the cell.
The probe is a PTC with a range of -55 ÷ 150°C and is installed on the evaporator conveyor.
B1 is connected to terminals I45-I46, connector D8.
A fault with the probe or analog input of the board displays the Air probe alarm.
Probes – Evaporator Probe
The B2 evaporator probe measures the temperature of the evaporator.
The probe is a PTC with a range of -55 ÷ 150°C and is installed on the evaporator coil.
B2 is connected to terminals I47-I48, connector D9.
A fault with the probe or analog input of the board displays the Evaporator probe alarm
Probes – Probe to the heart
The B3 core probe measures the temperature inside the product.
The core probe contains 4 PT1000 probes with a range of -80 ÷ 210°C and, if the temperature is negative, can be heated to facilitate extraction from the frozen product.
The probes are connected to J terminals JC, J1, J2, J3, J4 while the resistor is connected to terminals 23-24 (12V); D10 connector that also connects the display.
A probe fault displays the probe alarm to the heart
Heating elements – Door heating element
The R1 door heating element during blast chilling cycles prevents moisture from freezing by blocking the door.
The resistor is connected to terminal 17, connector D14 is located behind the door rebate frame.
Resistors – Cell Resistor
The heating element for the R4 cell is mainly used for cooking.
The heating elements, one for each evaporator fan, are controlled by terminal A2, connector D3, on 051-081 and by K8, powered by A2 in the larger units (there is a D3 connector for each element/fan).
Overheating of the cell causes the TF thermal safety to intervene and interrupt the cycle; each element is protected by TB
Protections – Compressor Thermal
The thermal protection of the Y1 compressor is present in all three-phase models.
The intervention of the motor protector Y1 closes the inputs I53 – I54 and generates the Compressor Thermal alarm message and stops the device; You will need to manually re-enable protection.
Protections – High Pressure Switch
The P1 high-pressure switch trips if the pressure on the liquid line exceeds 29.5 Bar and switches off below 22.7 Bar.
The tripping of the high pressure switch, inputs I55 - I56, connector D6, generates the high pressure alarm message and causes the compressor M1 to stop, the evaporator fans M3 and the heating elements R4 to be deactivated.
Protections – Safety thermostat
The TF cell safety thermostat is located on the top of the evaporator box and trips if the temperature in the cell exceeds the 95°C limit.
The trip of the thermostat, inputs I57 - I58, connector D7, generates the high pressure alarm message and causes the compressor M1, the fans of the M3 evaporator to stop and the R4 heating elements to be deactivated.
Protections – Heating element thermostat
The heating elements are protected by a thermostat connected directly to the power supply line.
If tripping is carried out, the thermostat temporarily cuts off the power supply to the heating elements until the temperature drops below the safe limit.
No action on the control board from this thermal safety.
Components – Transformer
The T-transformer supplies the baseboard with 12V on terminals 1–2 and also supplies power to the probe's resistor at core B3 from terminals 23–24.
Components – Door Contact
The I3 port contact is a reed sensor mounted on the structure above the capacitor.
I3 is connected to inputs I51 – I52, connector D13.