Merloni L55 VE LCD Technical Manual

55 cm wide built-in fridge-freezers

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Merloni Elettrodomestici

Technical Manual

55 CM WIDE BUILT-IN FRIDGE-FREEZERS

contains are supplied without liability arising from errors or omissions. No part may be reproduced, used or copied without written consent or a con-

tractual clause.

Language Issue/Edition

Page

04-10-22/01

1-33

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Page 1 55 CM WIDE BUILT-IN FRIDGE-FREEZERS All parts included in this document are the property of Merloni Elettrodomestici S.p.A. All rights reserved. This document and the information it contains are supplied without liability arising from errors or omissions. No part may be reproduced, used or copied without written consent or a con- tractual clause.
Page 2: Table Of Contents
Merloni Elettrodomestici Index FEATURES OF THE APPLIANCES L55 VE LCD L55 NF LCD LEGEND - RESTYLING FOR ARISTON BUILT-IN MODELS L=55 CM ALARM MESSAGES AUTOTEST ANALYSIS OF LOADS Compressor Fridge Lamp and Fridge Door Switch Solenoid valve Ambient fan Defrost elements (No-Frost only)
Page 3: Features Of The Appliances
Mode LCD display Select Freezer thermostat L55 VE LCD L55 NF LCD 1 LCD Display: for adjusting the refrigerator and freezer compartments, setting the various functions and signalling alarm conditions to the user. 1 FZ knob: for switching on the appliance and adjusting the freezer compartment.
Page 4: Legend - Restyling For Ariston Built-In Models L=55 Cm
Merloni Elettrodomestici LEGEND - RESTYLING FOR ARISTON BUILT-IN MODELS L=55 CM Technical Manual Language Issue/Edition Page 55 CM WIDE BUILT-IN FRIDGE-FREEZERS 04-10-22/01 4-33...
Page 5: Alarm Messages
Merloni Elettrodomestici ALARM MESSAGES Alarm messages, coded A1 and A2, refer exclusively to the Freezer compartment. Their function is to alert the user to the storage condition of food. An A1 alarm signal is triggered when: • the freezer temperature is higher than +2 °C;...
Page 6: Autotest
Merloni Elettrodomestici AUTOTEST This helps with a quick check of the loads, which otherwise are difficult to acti- vate, as well as of the probes and the EEPROM memory. MODEL DEACTIVATION CHECK RESPONSE ACTIVATION Appliance OFF: 4 min after activation...
Page 7: Analysis Of Loads
Merloni Elettrodomestici ANALYSIS OF LOADS 1. Compressor Information How It Works: they are managed by the microcontroller based on the temperatures measured by the probes. Protection time: (about eight minutes) the compressor is forced not to switch itself on before this period of time has elapsed from the last time it was switched off.
Page 8: Fridge Lamp And Fridge Door Switch
Merloni Elettrodomestici 2. Fridge Lamp and Fridge Door Switch INFORMATION: How It Works: the lamp can only be switched on with the appliance ON and the fridge door open. After the fridge door has been open for 2 minutes the lamp starts flashing and an acoustic alarm sounds.
Page 9: Solenoid Valve
Merloni Elettrodomestici 3. Solenoid valve INFORMATION: Solenoid valve (EV) operation is linked to demand for refrigeration from the two com- partments (FR and FZ). The component is driven by a series of electrical impulses and, once forced into posi- tion, is able to maintain that position without the need for any further energy. The elec-...
Page 10 Merloni Elettrodomestici Tirac not permitted Tirac in conduction 3.3 ms 20 msec (50 Hz) Driver signal EV (10 impulses) Mains supply signal Technical Manual Language Issue/Edition Page 55 CM WIDE BUILT-IN FRIDGE-FREEZERS 04-10-22/01 10-33...
Page 11: Ambient Fan
Merloni Elettrodomestici 4. Ambient fan INFORMATION: How It Works: when cold air is directed into the refrigerator compartment, the ambi- ent fan is also activated. Operation of this fan is partialized (first on then off) in accord- ance with the position of the fridge knob, taking into account in any case an initial delay.
Page 12: Defrost Elements (No-Frost Only)
Merloni Elettrodomestici 5. Defrost elements (No-Frost only) INFORMATION: How It Works: the two elements (evaporator 72 W and 650 Ohm and drip tray 15 W and 3200 Ohm) are both activated solely during the defrosting phase, which is ended based on temperature or time.
Page 13: Fz Evaporator Fan (No-Frost Only)
Merloni Elettrodomestici 6. FZ Evaporator Fan (No-Frost only) INFORMATION: How It Works: it is always switched off with the appliance OFF and can be switched on when the appliance is in the ON condition only if the compressor is switched on.
Page 14: Condenser Fan
Merloni Elettrodomestici 7. Condenser fan INFORMATION: How It Works: when the appliance is OFF the fan is always OFF and when the appli- ance is ON, the fan will be ON only when the compressor is running; when the com- pressor is switched off the fan is also switched off.
Page 15: Thermo Fuse (No-Frost Only)
Merloni Elettrodomestici 8. Thermo fuse (No-Frost only) INFORMATION: How It Works: it is a safety device which is tripped, cutting off the electrical power supply to the 72 W and 15 W resistors, when the temperature of the freezer evaporator reaches approximately +85 °C.
Page 16: Analysis Of Probes
Merloni Elettrodomestici ANALYSIS OF PROBES INFORMATION: How It Works: these are temperature sensors which associate measurements in de- grees centigrade with resistive values that are easily read and managed by the micro- processor on the board. In particular, as the temperature increases, electrical resistance decreases, and as the temperature decreases, resistance increases.
Page 17 Merloni Elettrodomestici POSSIBLE CAUSE OF MALFUNCTION: Microprocessor management Monitoring circuit on the board Connection on the board Wiring Probes TESTING: General on the appliance: Carry out the check using the Autotest procedure. Wiring and component: check for continuity and short circuits; check the connec- tions (connectors and terminals);...
Page 18: Analysis Of Memory
Merloni Elettrodomestici ANALYSIS OF MEMORY INFORMATION: How It Works: is necessary to maintain all the appliance's operating parameters; com- munication between the micro and the memory (on a special 8 pin socket on the Power board) can have a strong bearing on the functioning of the appliance and on the user's adjustments.
Page 19: Analysis Of Buzzer
Merloni Elettrodomestici ANALYSIS OF BUZZER INFORMATION: How It Works: the operation of buzzer is closely connected to the signalling and alarm functions: the buzzer is soldered onto the Power board in the control box on the instru- ment panel. POSSIBLE CAUSE OF MALFUNCTION:...
Page 20: Analysis Of Lcd Display
Merloni Elettrodomestici ANALYSIS OF LCD DISPLAY INFORMATION: How It Works: the user interface includes an LCD display for visualization of settings and for displaying possible malfunctions in the freezer compartment. POSSIBLE CAUSE OF MALFUNCTION: Microprocessor management Driver circuit on the board...
Page 21: Analysis Of Serial Lines
Merloni Elettrodomestici ANALYSIS OF SERIAL LINES INFORMATION: How It Works: it enables communication between the appliance and the external world (other appliances or other compatible equipment such as a PC, Modem etc. by means of special HW and SW. POSSIBLE CAUSE OF MALFUNCTION:...
Page 22: Demo Mode Function
Merloni Elettrodomestici DEMO MODE FUNCTION The DEMO MODE can be activated by keeping the SELECT/RESET and MODE keys pressed at the same time for more than 3 seconds, starting from an initial appliance OFF condition. Activating this function makes the user interface (display, keys and knobs) completely accessible without controlling any load (compressor, fridge fan and solenoid valve), ir- respective of the status of the appliance.
Page 23: Ve Electrical Diagram
Merloni Elettrodomestici VE ELECTRICAL DIAGRAM SERIAL SERIAL SERIAL SERIAL FREEZER AMBIENT PROBE FRIDGE AMBIENT PROBE EVAP. PROBE FRIDGE We reserve the property rights for this technical drawing, which may not be used or reproduced. Dimensions do not take treatment into account...
Page 24: Ve Schematic Diagram
Merloni Elettrodomestici VE SCHEMATIC DIAGRAM FR. DOOR SWITCH FRIDGE BLUE-3 WHITE 6 WAY EDGE CONNECTOR BROWN BLUE-1 BLACK BLUE SERIAL WIRES WITH DIFFERENT SECTION COMPR. COND. CONDENSER Technical Manual Language Issue/Edition Page 55 CM WIDE BUILT-IN FRIDGE-FREEZERS 04-10-22/01 24-33...
Page 25: Nf Electrical Diagram
Merloni Elettrodomestici NF ELECTRICAL DIAGRAM FREEZER EVAP. PROBE FREEZER PROBE FRIDGE PROBE FRIDGE EVAP. PROBE SERIAL SERIAL SERIAL SERIAL We reserve the property rights for this technical drawing, which may not be used or reproduced. Dimensions do not take treatment into account...
Page 26: Nf Schematic Diagram
Merloni Elettrodomestici NF SCHEMATIC DIAGRAM FR. DOOR SWITCH FRIDGE BLUE-7 YELLOW INDICATIVE 6 WAY EDGE CONNECTOR YELLOW-1 RED-1 BLUE-3 WHITE BLACK-1 FREEZER SERIAL EVAPORATOR RESISTOR DRIP TRAY RESISTOR THERMO FUSE COMPR. COND. CONDENS. Technical Manual Language Issue/Edition Page 55 CM WIDE BUILT-IN FRIDGE-FREEZERS...
Page 27: Electronic Board
Merloni Elettrodomestici ELECTRONIC BOARD Compressor relay Triac Load activated Freezer fan Fridge lamp Solenoid valve Defrost elements Fridge fan Technical Manual Language Issue/Edition Page 55 CM WIDE BUILT-IN FRIDGE-FREEZERS 04-10-22/01 27-33...
Page 28: Characteristics Of R600
Merloni Elettrodomestici CHARACTERISTICS OF R600 ADVANTAGES • Isobutane makes it possible to use a smaller amount of gas compared to R134a (45%) with greater yield. • Less sensitivity to humidity (mineral oil) • Less noise from compressor • Lesser incidence of blockage DISADVANTAGES •...
Page 29: Standard" Thermodynamic Circuit
Merloni Elettrodomestici “STANDARD” THERMODYNAMIC CIRCUIT 1. COMPRESSOR 2. ANTI CONDENSATION TUBE 3. CONDENSER 4. MOLECULAR FILTER 5. CAPILLARY TUBE 6. FREEZER EVAPORATOR 7. FRIDGE EVAPORATOR CHARACTERISTIC TEMPERATURES OF CIRCUIT IN °C Component Temperature Filter + (10 / 15) °C (condensation) •...
Page 30: Determination Of Circuit Charge
Merloni Elettrodomestici DETERMINATION OF CIRCUIT CHARGE • Evaporation pressure corresponding to –28 °C/–30 °C • Refrigerator plate completely frosted over so that T1=T2 (thermocouple position as shown in the figure) Temperature on plastic cell -24/-26 °C • Filter temperature and corresponding condensation pressure...
Page 31: Hazards And Effects On Health Of R600
Merloni Elettrodomestici HAZARDS AND EFFECTS ON HEALTH OF R600 Exposure limit Irritant Sensitizing Carcinogenic Health Inflammability Instability no risk; low risk; moderate risk; high risk; very high risk; • Return tube temperature equal to ambient temperature • Notes: With fan condensers it is advisable to insulate the thermocouple on the filter using armaflex or similar materials.
Page 32: Fridge-Freezer With Compressor And Solenoid Valve
Merloni Elettrodomestici FRIDGE-FREEZER WITH COMPRESSOR AND SOLENOID VALVE All models with solenoid valve compressors have electronic management. N.B. COMPRESSOR FREEZER EVAPORATOR (RED) CONDENSER FRIDGE EVAPORATOR (RED) ANTI CONDENSATION TUBE (LIGHT BLUE) SOLENOID VALVE RETURN TUBE (GREEN) ACCUMULATED GAS CANISTER FRIDGE CAPILLARY TUBE (RED)
Page 33 Merloni Elettrodomestici Merloni Elettrodomestici S.p.A. 47 Viale Aristide Merloni, Fabriano - 60044 - Italy tel. 0732/6611 - telex 560196 - fax 0732/662954 www.Merloni.com Language Issue/Edition Page 04-10-22/01 33-33...

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