55 CM WIDE BUILT-IN FRIDGE

Transcription

Merloni Elettrodomestici
Technical Manual
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 contractual clause.
Language Issue/Edition
I
04-10-22/01
Page
1-33
Index
1
FEATURES OF THE APPLIANCES
3
2
L55 VE LCD
L55 NF LCD
LEGEND - RESTYLING FOR ARISTON BUILT-IN MODELS L=55 CM
3
3
4
3
ALARM MESSAGES
5
4
AUTOTEST
6
5
ANALYSIS OF LOADS
7
6
1.
Compressor
2.
Fridge Lamp and Fridge Door Switch
3.
Solenoid valve
4.
Ambient fan
5.
Defrost elements (No-Frost only)
6.
FZ Evaporator Fan (No-Frost only)
7.
Condenser fan
8.
Thermo fuse (No-Frost only)
ANALYSIS OF PROBES
7
8
9
11
12
13
14
15
16
7
ANALYSIS OF MEMORY
18
8
ANALYSIS OF BUZZER
19
9
ANALYSIS OF LCD DISPLAY
20
10
ANALYSIS OF SERIAL LINES
21
11
DEMO MODE FUNCTION
22
VE ELECTRICAL DIAGRAM
23
VE SCHEMATIC DIAGRAM
24
NF ELECTRICAL DIAGRAM
25
NF SCHEMATIC DIAGRAM
26
ELECTRONIC BOARD
27
CHARACTERISTICS OF R600
28
MAIN DIFFERENCES BETWEEN R134 AND R600
28
“STANDARD” THERMODYNAMIC CIRCUIT
29
CHARACTERISTIC TEMPERATURES OF CIRCUIT IN °C
29
DETERMINATION OF CIRCUIT CHARGE
30
HAZARDS AND EFFECTS ON HEALTH OF R600
31
FRIDGE-FREEZER WITH COMPRESSOR AND SOLENOID VALVE
32
Technical Manual
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1
FEATURES OF THE APPLIANCES
Fridge thermostat
Mode
LCD display
L55 VE LCD
User interface
Loads
Input
Output
External serial line
Eeprom memory
Select
Freezer thermostat
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.
1 FR knob: for adjusting the refrigerator compartment.
1 Mode button: for selecting functions.
1 Select button: for activating/deactivating selected functions and resetting the buzzer.
1 COMPRESSOR
1 SOLENOID VALVE
1 FR LAMP
1 AMBIENT FAN (in fridge comp.)
1 CONDENSER FAN (not run by boards)
1 COMPRESSOR
1 SOLENOID VALVE
1 FR LAMP
1 AMBIENT FAN (in fridge comp.)
2 DEFROST ELEMENTS (evap. and
drip tray)
1 NF FZ FAN (in freezer comp.)
1 CONDENSER FAN (not run by boards)
1 THERMOFUSE (not run by boards)
2 KNOBS
2 BUTTONS
1 FR PROBE (in fridge comp.)
1 FR EV PROBE (in contact with FR
evaporator )
1 FZ AMBIENT PROBE (in freezer comp.)
1 FR DOOR SWITCH (two contact switch
on side of fridge comp.)
2 KNOBS
2 BUTTONS
1 FR AMBIENT PROBE (in fridge comp.)
1 FR EV PROBE (in contact with FR
evaporator )
1 FZ AMBIENT PROBE (in freezer comp.)
1 FZ EV PROBE (in freezer comp.)
1 FR DOOR SWTICH (two contact switch
on side of fridge comp.)
1 LCD DISPLAY
1 BUZZER (on electronic board)
Output in the compressor bay
On electronic board
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P=Decor panelable S=Self Ventilated
Blank=Nothing
A=Load-bearing
X=Cabinet
Blank=Built-in
2 numbers
Under (Table)
Built in
160 litres
B
T
S
Range = ECO
A
Blank=Static
V=Ventilated
N=No-Frost
G=Global Air
(No-Frost)
I
EU
GAS
DOOR
MARKET
OPENING
R 600
Europe
A=Only for Blank=R 134 Blank=Right EU=Europe
class A
a I=R 600
S=Left
EX=Export
UK
etc.
Eff Class. A
E=Electronic
D=Digital
REFRIGERATION
SPECIAL
ENERGY
TYPE
PERFORMANCE CLASS
4 Star Rating
16 2 4
(*) Definitive names of the Ranges will be communicated as soon they have been approved.
Self Ventilated
STAR RATING
Blank=Combi
1=Style
2=Ecotech Blank=Double door
o+4=One Door
3=Class
0+4=Under (Table)
Blank=Freezer
CONDENSERCO CAPACITY
Line
OLING
(LITRES) (Design)
Blank: = The characteristic is not specified in the description.
C=Combi
D=Double door
O=One Door
T=Under (Table)
F=Freezer
TYPE
2
B=Bult-in
CHANNEL STRUCTURE
LEGEND - RESTYLING FOR ARISTON BUILT-IN MODELS
L=55 CM
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Page
3
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;
• the freezer temperature stops for more than 4 hours, between -6 °C and
+2 °C.
An A2 alarm signal is triggered when:
• the freezer temperature is higher than +8 °C;
• an A1 alarm signal has been ongoing for over 24 hours.
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4
AUTOTEST
This helps with a quick check of the loads, which otherwise are difficult to activate, as well as of the probes and the EEPROM memory.
ACTIVATION (*)
MODEL
Appliance OFF:
freezer knob to zero
the SELECT
L55 VE Press
button for more than
LCD 3sec
DEACTIVATION
CHECK
RESPONSE
4 min after activation
Fridge lamp
Visual check by operator (the fridge lamp
stays on approx. 15sec)
When the appliance is
switched on again
Ambient fan
Operator's visual check
Probes (active •
after approx.
10sec)
•
•
fridge ambient fan fault - Super Cool
function symbol starts flashing;
freezer ambient fan fault - the Super
Freeze function symbol starts flashing;
fridge evaporator probe fault - Holiday
function symbol starts flashing.
EEPROM
Buzzer sounds if KO
Appliance OFF:
freezer knob to zero
4 min after activation
Fridge lamp
Visual check by operator (the fridge lamp
stays on approx. 15sec)
Press the SELECT
button for more than
3sec
When the appliance is
switched on again
Ambient fan
Freezer fan
Multiflow
resistor
L55 NF
LCD
Probes (active •
after 10s)
•
•
•
EEPROM
(*)
fridge ambient fan fault - Super Cool
function symbol starts flashing;
freezer ambient fan fault - the Super
Freeze function symbol starts flashing;
fridge evaporator probe fault - Holiday
function symbol starts flashing.
freezer evaporator probe fault - Ice
Party function symbol starts flashing.
Buzzer sounds if KO
Before using the Autotest it is advisable to check the correct operation of the refrigerator lamps and the
buzzer which are used for signalling possible malfunctions.
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5
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.
Black Out: the compressor starts running again immediately.
On/Off (on display): observes the compressor's 8 minute delayed start.
Possible cause of malfunction
Microcontroller management
Compressor driver circuit on the board
Connection on the board
Wiring
Connection on the compressor
Internal compressor breakdown/fault
TESTING:
General on the appliance: force the compressor to switch on by activating the
24h SUPER FREEZE function and check that the compressor switches on. Remember
the 8 minutes of compressor protection.
Wiring: check for continuity and short circuits; check the connections (connectors and
terminals); check for presence of voltage.
Component: check with simulated load (lamp); direct check of the compressor (powered directly).
Electronic board: visual check and quick check of the board (blowouts or burnouts,
etc.); check by using a replacement.
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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. After 4 minutes the flashing becomes quicker.
POSSIBLE CAUSE OF MALFUNCTION:
Refrigerator door circuit input on the board
Lamp driver circuit on the board
Wiring
Connections on the lamp
Connections on fridge door switch
Lamp
Fridge door switch
TESTING:
General on the appliance: switch on the appliance, open the door and verify that the
lamp switches on.
carry out the check using the Autotest procedure.
Component: visual check of the lamp; direct check of the lamp (powered directly);
check by using a replacement lamp. One possible cause of incorrect lamp functioning is
a problem with the fridge door switch.
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3. Solenoid valve
INFORMATION:
Solenoid valve (EV) operation is linked to demand for refrigeration from the two compartments (FR and FZ).
The component is driven by a series of electrical impulses and, once forced into position, is able to maintain that position without the need for any further energy. The electrical impulses are simply supply voltage half-waves specially selected by the control
board: (by means of special circuitry on the board: triac) positive half-waves force the
component in one direction and negative half-waves force it the opposite way. The link
between the condition of the solenoid valve and the appliance's thermodynamic circuits
(FR or FZ) depends on the connection of the driver cable and the capillary coupling.
The control board sends first of all a sequence of 10 impulses to force the solenoid
valve into the opposite state to that which is necessary and, after a few seconds (2-3s),
sends another 10 impulses to force the solenoid valve into the desired state. The purpose of this is to move the internal stop and thus ensure, during the exchange, the removal of any impurities.
To ensure that no interference has altered the state of the solenoid valve (which is sensitive to electrical interference) and that it is in the desired condition, it is automatically
refreshed every 15 minutes.
The fridge nonetheless always has priority over the freezer.
Microprocessor management
Solenoid valve driver circuit on the board
Wiring
Connections on the solenoid valve
Solenoid valve
TESTING:
General on the appliance: direct cold air into the freezer compartment only by
switching on the appliance and turning the fridge knob to zero. Check that only the
freezer compartment is cold. Subsequently, turn the fridge knob to switch on both
compartments. Check that cold air is directed into the refrigerator compartment.
Component: check with simulated load (lamp); direct check of the solenoid valve.
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Tirac not permitted
Tirac in conduction
3.3 ms
20 msec (50 Hz)
Driver signal EV
(10 impulses)
Mains supply signal
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4. Ambient fan
INFORMATION:
How It Works: when cold air is directed into the refrigerator compartment, the ambient fan is also activated. Operation of this fan is partialized (first on then off) in accordance with the position of the fridge knob, taking into account in any case an initial delay.
After door opening, during the fridge compressor's subsequent On cycle, the ambient
fan will remain on until the compressor's next OFF cycle (therefore not partialized).
Fan driver circuit on the board
Wiring
Connections on the fan
Ambient fan
TESTING:
General on the appliance: direct cold air into both fridge and freezer compartments,
open the door and hold down the fridge door switch. Visually check that, after the delayed activation period has elapsed, the ambient fan starts working.
Carry out the check using the Autotest procedure.
Component: check with simulated load (lamp); directly check the ambient fan (with
special wiring).
LEGEND
P = fixed period of 10 minutes
A = ambient fan ON time (variable)
fridge compressor ON
E.g: time A in the figure is relative to the fridge
knob set to +4 °C.
Fridge knob position
Time A
(% compared to P)
+8 °C
0%
+7 °C
0%
+6 °C
20%
+4 °C
50%
+2 °C
100%
Fan
ON
Fan
OFF
7 minute delay in activation of ambient fan
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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.
In any case, the power supply of the 72 W resistor is cut off if the probe measures a
temperature of approximately +8 °C.
The time lapse between one defrosting cycle and another varies between a maximum of
30 hours to a minimum of 6 hours, and is determined by the electronic board in accordance with the table below, based on the time taken by the Freezer probe to reach +8 °C.
Time to reach +8 °C
Defrost cycle interval
16 minutes
30 hours
16/20 minutes
27 hours
20/24 minutes
26 hours
24/28 minutes
23 hours
28/32 minutes
21 hours
32/36 minutes
17 hours
36/40 minutes
13 hours
40 minutes
6 hours
Warnings:
• When a fast freeze cycle is selected,
defrosting is carried out after
14 hours.
• In the event of a power failure, the
freezer is automatically defrosted
following the first compressor
cycle.
Resistor driver circuit on the board
Wiring
Connection on the elements
Elements
Blown thermo fuse
TESTING:
General on the appliance: Carry out the check using the Autotest procedure.
terminals); check for presence of voltage. check that the thermo fuse is not open.
Component: check with simulated load (lamp); direct check of the elements (powered
directly).
Board: visual check and quick check of the board (blowouts or burnouts, etc.); check by
using a replacement.
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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.
Delay in switching on: the fan has a start time delay of about two minutes compared
with that of the compressor and is activated only after the evaporator has cooled to below -18 °C in the first cycle after a defrosting.
FZ evaporator fan driver circuit on the board
Wiring
Connection on the FZ evaporator fan
FZ evaporator fan
TESTING:
terminals); check for presence of voltage. check that the thermo fuse is not open.
Component: check with simulated load (lamp); direct check of the fan (powered directly).
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7. Condenser fan
INFORMATION:
How It Works: when the appliance is OFF the fan is always OFF and when the appliance is ON, the fan will be ON only when the compressor is running; when the compressor is switched off the fan is also switched off.
Microcontroller management (for the compressor)
Driver circuit (for the compressor) on the board
Connection on the compressor terminal board
Wiring
Connection on the condenser fan
Condenser fan
TESTING:
General on the appliance: force the compressor to switch on (and, as a result, the fan)
by activating the 24h SUPER FREEZE function and verify that the fan switches on at
the same time as the compressor. Remember the 8 minutes of compressor protection.
Component: check with simulated load (lamp); direct check of the fan (powered directly).
Board: the fan is not controlled directly by the electronic board, but indirectly through
the control of the compressor.
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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.
The thermo fuse is housed on the metal support in contact with the freezer evaporator.
This component, having been tripped due to excessive temperature, can no longer be
used.
Connection on thermo fuse
Wiring
Thermo fuse
TESTING:
General on the appliance: carry out the check using the Autotest procedure and
check for correct functioning of the defrosting resistors (a malfunction could in any
case be due not only to the thermo fuse: see paragraphs relating to the two loads).
Wiring and component: check for continuity and short circuits; check the connections (connectors and terminals).
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6
ANALYSIS OF PROBES
INFORMATION:
How It Works: these are temperature sensors which associate measurements in degrees centigrade with resistive values that are easily read and managed by the microprocessor on the board.
In particular, as the temperature increases, electrical resistance decreases, and as the
temperature decreases, resistance increases.
The control system utilizes four probes, which have the following functions:
FREEZER AMBIENT PROBE
This probe is located in the freezer compartment; its task is to measure the temperature
and communicate it to the microprocessor, which uses this data to manage the alarms
and the fast freezing function.
FRIDGE AMBIENT PROBE
This probe is located on the right hand wall inside the fridge compartment, inside a small
plastic cage. Its task is to measure the internal fridge temperature and communicate it to
the microprocessor, which uses this data to regulate the refrigerator's thermostat.
This is therefore the most important probe in terms of refrigerator operation, since it
determines the thermal cycles (activating and deactivating the compressor and solenoid
valve).
REFRIGERATOR EVAPORATOR PROBE
This probe is located on the fridge evaporator in the same area as the thermostat bulb
in the electromechanical version. Its task is to measure the temperature at the end of
the defrosting cycle (approx. +5 °C) and communicate it to the microprocessor every
time a defrost cycle is carried out.
FREEZER EVAPORATOR PROBE (No-Frost only)
This probe is located in contact with the freezer evaporator. Its task is to measure the
temperature (+8 °C) during freezer defrosting and deactivate the two resistors, thus
ending the defrost cycle.
If the FZ AMBIENT probe breaks: the appliance continues working since it has an alternative timed mode, but obviously the temperature alarms will no longer be signalled!
If the FR AMBIENT probe breaks (only on models with display on the door): the appliance continues working since the smart microprocessor handles alternation between
fridge and freezer.
The Autotest procedure can in any case be used to pinpoint which probe is not working!
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Monitoring circuit on the board
Wiring
Probes
TESTING:
Wiring and component: check for continuity and short circuits; check the connections (connectors and terminals); check that the resistive values correspond to the values given by the manufacturer (heat the probe touching it with your hand where possible and check the variation in the resistive value).
Temp °C
Ohm
Resistor
Temp °C
Ohm R
esistor
Temp °C
Ohm
Resistor
50
973.6
-2
9701
-22
29045
45
1181
-3
10215
-23
30797
40
1493
-4
10759
-24
32668
35
1765
-5
11337
-25
34666
30
2176
-6
11949
-26
36800
25
1700
-7
12598
-27
39082
20
3360
-8
13288
-28
41521
15
4225
-9
14019
-29
44131
10
5348
-10
14795
-30
46921
9
5611
-11
15620
-31
49910
8
5888
-12
16497
-32
53111
7
6182
-13
17429
-33
56541
6
6491
-14
18420
-34
60218
5
6818
-15
19475
-35
64161
4
7164
-16
20596
-36
68393
3
7529
-17
21791
-37
72932
2
7916
-18
23063
-38
77808
1
8325
-19
24418
-39
83046
0
8758
-20
25862
-40
88577
-1
9216
-21
27402
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7
ANALYSIS OF MEMORY
INFORMATION:
How It Works: is necessary to maintain all the appliance's operating parameters; communication 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.
Memory circuit on the board
Memory
TESTING:
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8
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 instrument panel.
Driver circuit on the board
Buzzer
TESTING:
General on the appliance and component: starting from the appliance ON condition, keep the refrigerator and/or the freezer door open for more than three to four
minutes so as to force the door open alarm condition; check that the buzzer starts to
sound and turns off just by the door being closed (failure to activate could also be due
to the switches malfunctioning: see relative paragraph).
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9
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.
Driver circuit on the board
Display
TESTING:
General on the appliance and component: switch on the appliance and turn the two
knobs and press the buttons to change the settings.
Wiring: (between the two boards) check for continuity and short circuits; check the
connections (connectors and terminals).
Board: visual check and quick check of the Display board (blowouts or burnouts, etc.)
check by using a replacement. It is recommended to also check the Power board.
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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.
Input/Output circuit on the board
Wiring
Connection in the compressor bay
TESTING:
General on the appliance: the serial line can only be verified by means of connection
to a PC.
terminals); check for foam on the contacts.
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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), irrespective of the status of the appliance. The lamp status is controlled according to refrigerator door opening. DEMO MODE activated is shown by the flashing with the
message OFF in both fridge and freezer compartments.
The DEMO MODE can be deactivated by holding the SELECT/RESET and MODE
keys at the same time for more than 3 seconds, starting from the Freezer knob in the
OFF position.
To quit DEMO MODE, return to the product OFF condition (the word OFF on both
fridge and freezer compartments stops flashing).
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VE ELECTRICAL DIAGRAM
SERIAL
SERIAL
SERIAL
SERIAL
FREEZER
AMBIENT PROBE
FRIDGE
AMBIENT PROBE
Dimensions do not take treatment into account
L:
N:
EV:
MV1:
MV2:
CO:
ILI:
LI:
PTC:
RH:
CN1:
CN2:
CN3:
CN4:
SND1-2-3:
We reserve the property rights for this technical drawing,
which may not be used or reproduced.
LEGEND
LINE
NEUTRAL
SOLENOID VALVE
FRIDGE COMPARTMENT FAN UNIT
COMPRESSOR BAY FAN UNIT
COMPRESSOR UNIT
FRIDGE LAMP BUTTON
FRIDGE LAMP
STARTER DEVICE
THERMOPROTECTOR
BOARD AND DRAIN SUPPLY
SERIAL
PROBES
FRIDGE DOOR BUTTON
TEMPERATURE PROBES
ELECTRONIC CONTROL
BOARD
EVAP.
PROBE FRIDGE
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VE SCHEMATIC DIAGRAM
FR. DOOR SWITCH
FRIDGE
FAN
BROWN-2
WHITE
WHITE
BLUE-4
BROWN-1
BLUE-3
6 WAY EDGE CONNECTOR
RED
BLACK
BROWN
BLUE-1
BLUE
WIRES WITH
DIFFERENT SECTION
FREEZER FAN
FRIDGE FAN
FRIDGE EVAP.
SERIAL
COMPR.
COND.
CONDENSER
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We reserve the property rights for this technical drawing,
which may not be used or reproduced.
Dimensions do not take treatment into account
L:
N:
EV:
MV1:
MV2:
MV3:
CO:
ILI:
LI:
PTC:
RH:
TF:
RES. EVAP.:
RES. GOCC.:
CN1:
CN2:
CN3:
CN4:
LEGEND
LINE
NEUTRAL
SOLENOID VALVE
FRIDGE COMPARTMENT FAN UNIT
FREEZER COMPARTMENT FAN UNIT
COMPRESSOR BAY FAN UNIT
COMPRESSOR UNIT
FRIDGE LAMP BUTTON
FRIDGE LAMP
STARTER DEVICE
THERMOPROTECTOR
THERMO FUSE
EVAPORATOR ELEMENT
DRIP TRAY ELEMENT
BOARD AND DRAIN SUPPLY
SERIAL
PROBES
FRIDGE DOOR BUTTON
ELECTRONIC CONTROL
BOARD
NF ELECTRICAL DIAGRAM
FREEZER
EVAP. PROBE
FREEZER
PROBE
FRIDGE
PROBE
FRIDGE
EVAP. PROBE
SERIAL
SERIAL
SERIAL
SERIAL
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Page
NF SCHEMATIC DIAGRAM
FR. DOOR SWITCH
FRIDGE
FAN
INDICATIVE
YELLOW
BLACK-2
BLUE-9
BROWN-3
BROWN-2
BLUE-7
BROWN-1
GREY
6 WAY EDGE CONNECTOR
YELLOW-1
RED-1
WHITE
BLUE-3
BLACK-1
FREEZER
FAN
DRIP TRAY
RESISTOR
FREEZER EVAP.
FREEZER FAN
EVAPORATOR
RESISTOR
FRIDGE FAN
FRIDGE EVAP.
SERIAL
THERMO FUSE
COMPR.
COND.
CONDENS.
Technical Manual
Language
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I
04-10-22/01
Page
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ELECTRONIC BOARD
Q2
Q11
Q10
Q8
Q9
Compressor relay
Triac
Load activated
Q2
Freezer fan
Q10
Fridge lamp
Q11
Solenoid valve
Q9
Defrost elements
Q8
Fridge fan
Technical Manual
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Page
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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
•
Greater attention to charges
(a few grams less/more can cause significant charge imbalances)
•
Greater attention to evacuation
(lower working pressures: greater attention to air infiltration due to the low pressures reached)
•
Greater problems of gas flow noise in the circuit
MAIN DIFFERENCES BETWEEN R134 AND R600
R134
R600
Sensitivity to humidity
High (synthetic oil)
Negligible (mineral oil)
Noise level
High (high working pressures)
Low
Inflammability
No
High
Toxicity
Low
Low
Atmospheric pollutants
No
Volatile organic compounds
Lubricant
Synthetic
Mineral
Technical Manual
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“STANDARD” THERMODYNAMIC CIRCUIT
1.
2.
3.
4.
5.
6.
7.
COMPRESSOR
ANTI CONDENSATION TUBE
CONDENSER
MOLECULAR FILTER
CAPILLARY TUBE
FREEZER EVAPORATOR
FRIDGE EVAPORATOR
CHARACTERISTIC TEMPERATURES OF CIRCUIT IN °C
Component
Temperature
Filter
(condensation)
Tamb + (10 / 15) °C
•
Evaporator
Return tube
•
-30 °C or lower
(with thermocouple on metal tube)
-24/-26
(thermocouple on plastic cell)
Tamb
Temperature measured on tube, as far as possible from the
compressor
Technical Manual
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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
(delivered to compressor) so that:
T = Tambient + 10/15 °C
E.g: Tamb=25 °C 35<T(filter)<40
Depending on the type of refrigerant and application
Technical Manual
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HAZARDS AND EFFECTS ON HEALTH OF R600
Exposure limit
Yes
Irritant
No
Sensitizing
No
Carcinogenic
No
Health
0*
Inflammability
4
Instability
0
*0:
1:
2:
3:
4:
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.
• position the thermocouple
adhesive tape (possibly metallic)
using
• protect the thermocouple with armaflex
Technical Manual
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FRIDGE-FREEZER WITH COMPRESSOR
AND SOLENOID VALVE
N.B. All models with solenoid valve compressors have electronic management.
1.
2.
3.
4.
5.
6.
COMPRESSOR
CONDENSER
ANTI CONDENSATION TUBE (LIGHT BLUE)
RETURN TUBE (GREEN)
FRIDGE CAPILLARY TUBE (RED)
FREEZER CAPILLARY TUBE (YELLOW)
7.
8.
9.
10.
11.
FREEZER EVAPORATOR (RED)
FRIDGE EVAPORATOR (RED)
SOLENOID VALVE
ACCUMULATED GAS CANISTER
MOLECULAR FILTER
EVAPORATOR COMPONENTS Low Pressure
RED
➨ Fridge + Freezer
YELLOW
➨
Fridge + Freezer
GREEN
➨
Fridge + Freezer
COMMON COMPONENTS High Pressure
LIGHT BLUE ➨ Anti Condensation Tube
Technical Manual
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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
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04-10-22/01
Page
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55 CM WIDE BUILT-IN FRIDGE

Transcription

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