Ariston MSZ 70 NF COOLING 2004 User manual

Merloni Elettrodomestici
Instruction Manual Language Edition Page
Side-By-Side Refrigerator – Ariston MSZ 70 NF EN 2004.11.11 1 - 88
I
In ns st tr ru uc ct ti io on n M Ma an nu ua al l
S Si id de e- -B By y- -S Si id de e R Re ef fr ri ig ge er ra at to or r
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AR RI IS ST TO ON N M MS SZ Z 7 70 0 N NF F
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Contents of the Manual: Note for the Technician
This manual is a supporting document for technical personnel; it contains a description of the
various product types, the general operating principle, and other useful information. Technical
personnel should anyway consult the specific model on Service Net (www.servicenet.merloni.com)
to gain access to data and updates of electrical diagrams, technical bulletins, and spare parts.
All the 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 for possible errors
or omissions. No part of it can be reproduced, used or copied without written permission or without being
authorised by the terms of a contract clause.

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Side-By-Side Refrigerator – Ariston MSZ 70 NF EN 2004.11.11 2 - 88
C
CO ON NT TE EN NT TS S
1. Product Type......................................................................................................................4
1.1. KEY........................................................................................................................................................... 4
1.2. Photo: MSZ 701 NF HB (T) ...................................................................................................................... 4
1.3. Product Specifications .............................................................................................................................. 5
1.3.1. Dimensions: MSZ 70 NF HB (T)........................................................................................................ 5
1.3.2. Dimensions: MSZ 70 NF (T).............................................................................................................. 6
1.3.3. Key to Components ........................................................................................................................... 7
1.3.4. Product Energy Label ........................................................................................................................ 8
1.4. Operating Principle ................................................................................................................................... 9
1.4.1. Chilled Air Circulation ...................................................................................................................... 10
1.4.2. Refrigerant and Chilled Air Circulation Circuit .................................................................................11
1.4.3. Refrigerant circuit flow diagram....................................................................................................... 12
1.4.4. Technical Specifications .................................................................................................................. 12
1.5. Programs and Functions......................................................................................................................... 13
1.5.1. Display / Control Panel .................................................................................................................... 13
1.5.2. Freezer Temperature Control (FC).................................................................................................. 15
1.5.3. Super Freeze................................................................................................................................... 16
1.5.4. Refrigerator Temperature Control (RC)...........................................................................................16
1.5.5. Control of Normal / Load / Fan modes ............................................................................................18
1.5.6. Defrost Cycle ................................................................................................................................... 22
1.5.7. Defrost Mode ................................................................................................................................... 24
1.5.8. Presentation of Errors on Display.................................................................................................... 25
1.5.9. Forced Defrost................................................................................................................................. 28
1.5.10. Initial defrosting ............................................................................................................................... 28
1.5.11. Audible Signal Or Alarm .................................................................................................................. 28
1.5.12. Post Delivery Explanations.............................................................................................................. 29
1.5.13. Compressor Restart Safety Device ................................................................................................. 29
1.5.14. Back Up Function ............................................................................................................................ 29
1.5.15. Electrical Components Start Delay.................................................................................................. 30
1.5.16. Home Bar Heating Element (Cooling Centre) ................................................................................. 30
1.5.17. Interior Lights Control ...................................................................................................................... 31
1.5.18. Demonstration Function .................................................................................................................. 31
1.5.19. Adjustment of Fridge Probe Off Set-Point ....................................................................................... 32
1.5.20. Functions Summary......................................................................................................................... 33
1.5.21. Automatic Ice Maker........................................................................................................................ 34
1.5.22. Dispenser Control Function ............................................................................................................. 38
1.6. Components............................................................................................................................................ 40
1.6.1. Condenser Fan Solenoid Valve Disassembly ................................................................................. 48
1.6.2. Removal of Main PCB ..................................................................................................................... 49
1.6.3. Removing the Dispenser Surround .................................................................................................49
1.6.4. Removing the Display PCB ............................................................................................................. 50
1.6.5. Removing the Dispenser Microswitch ............................................................................................. 51
1.6.6. Removing the Ice Flap Cover .......................................................................................................... 52
1.6.7. Removing the Door Handle ............................................................................................................. 53
1.6.8. Removing Freezer Cavity Internal Components ............................................................................. 53
1.6.9. Freezer Probe Removal .................................................................................................................. 56
1.6.10. Removing the Evaporator Coil ........................................................................................................ 56
1.6.11. Removing Fridge Cavity Internal Components................................................................................ 57
1.6.12. Removing the fridge cavity lamps cover..........................................................................................57
1.6.13. Removing the Fridge Cavity Probe ................................................................................................. 57
1.6.14. Removing the Water Container ....................................................................................................... 58
1.6.15. Removing the Fridge/Freezer Door Seals....................................................................................... 58
1.6.16. Removing the Home Bar Seals ....................................................................................................... 58
2. Wiring Diagrams ..............................................................................................................59

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2.1.
Power Supply.......................................................................................................................................... 59
2.1.1. Functions of Each Probe ................................................................................................................. 60
2.1.2. Relay Functions............................................................................................................................... 61
2.1.3. Wiring............................................................................................................................................... 63
2.1.4. Fan Operation.................................................................................................................................. 64
2.1.5. Main Power PCB Circuit Diagram ................................................................................................... 65
2.1.6. Front Commands PCB Circuit Diagram .......................................................................................... 66
2.1.7. Ice Dispenser Description: Cubes and Crushed Ice ....................................................................... 67
2.1.8. Description of Water Filling and Distribution ...................................................................................68
3. Assistance........................................................................................................................69
3.1. Safety and Precautions........................................................................................................................... 69
3.2. Disassembly............................................................................................................................................ 69
3.2.1. Removing the ice maker water filler pipe ........................................................................................70
3.2.2. From inside the freezer:................................................................................................................... 70
3.2.3. Removing / refitting the water tank .................................................................................................. 70
3.2.4. Removing and Refitting the Ice Crusher (Inside the ice container)................................................. 71
3.2.5. Removing / Refitting the Ice Maker ................................................................................................. 71
3.2.6. Ice maker – Connections................................................................................................................. 72
3.2.7. Ice tray rotation mechanism ............................................................................................................ 72
3.2.8. Removing and Refitting the Ice Crusher Solenoid and Motor ......................................................... 73
3.2.9. Ice dispenser solenoid and flap....................................................................................................... 73
3.2.10. Water / Ice dispenser switch............................................................................................................ 74
3.2.11. Removing the Doors........................................................................................................................ 74
4. Exploded Views of Product: MSZ701NFHB (34037)........................................................75
4.1. Exploded view 1: Side-by-Side ............................................................................................................... 75
4.2. Exploded view 2: Compressor Compartment .........................................................................................76
4.3. Exploded View 3: Fridge Accessories .................................................................................................... 77
4.4. Exploded View 4: Freezer Accessories .................................................................................................. 78
4.5. Exploded View 5: Freezer Door.............................................................................................................. 79
4.6. Exploded View 6: Fridge Door ................................................................................................................ 80
5. Appendix..........................................................................................................................81
5.1.1. Removing the Freezer Door ............................................................................................................ 81
5.1.2. Removing the Fridge Door .............................................................................................................. 82
5.1.3. Refitting the freezer door ................................................................................................................. 83
5.1.4. Refitting fridge door ......................................................................................................................... 84
5.1.5. Glossary........................................................................................................................................... 85

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Side-By-Side Refrigerator – Ariston MSZ 70 NF EN 2004.11.11 4 - 88
1
1. . P PR RO OD DU UC CT T T TY YP PE E
1
1. .1 1. . K KE EY Y
M S Z 70 1 NF HB T
Merloni Side-
by-Side
Big Size
appliance
Capacity
(litres)
class
Colour
1. White
2. Stainless steel
3. Aluminium
No Frost
Home Bar
(where
present)
Tropicalized
Examples of various Ariston models available at November 2004:
Model Commercial Code
MSZ701NF 34034
MSZ701NFHB 34037
MSZ702NF 34036
MSZ702NFHB 34035
1
1. .2 2. . P P
H
HO OT TO O
:
: M MS SZ Z 7 70 01 1 N NF F H HB B ( (T T) )
Dispenser, Freezer side Dispenser, Freezer side Home Bar, Freezer side

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Side-By-Side Refrigerator – Ariston MSZ 70 NF EN 2004.11.11 5 - 88
1
1. .3 3. . P P
R
RO OD DU UC CT T
S
S
P
PE EC CI IF FI IC CA AT TI IO ON NS S
1.3.1. D IMENSIONS : MSZ 70 NF HB (T)

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1.3.2. D IMENSIONS : MSZ 70 NF (T)

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1.3.3. K EY TO C OMPONENTS
Freezer
1. Ice cubes container
2. Freezer light
4. Freezer shelf
3. Water/ice dispenser
5. Freezer door shelf
6. Freezer bin
Fridge
7. Dairy products compartment
8. Deodorizer
9. Refrigerator light
10. Wine shelf
11. Refrigerated container
12. Refrigerator shelf
14. Refrigerator door shelf
13. Removable egg rack
15. Crisper drawer
16. Refrigerated door
compartment

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1.3.4. P RODUCT E NERGY L ABEL
Diagram Photo

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1
1. .4 4. . O O
P
PE ER RA AT TI IN NG G
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P
R
RI IN NC CI IP PL LE E
1. Tray temperature sensor (fitted under the ice-cube production tray)
2. Freezer temperature sensor
3. Defrost end temperature sensor (located on the evaporator coil)
4. Refrigerator temperature sensor
5. Room sensor, fitted on the main electronic PCB (the photo shows the PCB
cover located on top of the appliance).
Using measurements and status information supplied by the sensors
(including the fridge and freezer door microswitches), the
microprocessor manages the following systems:
- freezer system
- refrigerator system
- condensation system
- compressor
- defrost system
1 Evaporator and 2 Fans
• Air duct
• 2 separately cooled cavities
• Constant temperature cooling
• Active Control System

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1.4.1. C HILLED A IR C IRCULATION
Freezer cavity Fridge cavity
1. Fridge Fan
2. Fridge Treated Air Return

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1.4.2. R EFRIGERANT AND C HILLED A IR C IRCULATION C IRCUIT
Key
Hot Pipe Tubo Caldo
Hot Pipe Conn Connessione tubo caldo
Suction Pipe Tubo di Aspirazione
R Fridge
F Freezer
I.Pipe (capillary
tube/evaporator
union)
Giunzione Capillare /
Evaporatore
EVA Evaporator
WI-CON Condenser
Pipe Suc Conn Connessione Tubo Aspirazione
Pipe Conn B Connessione Tubo Mandata
Comp Compressor
Capi Tube Capillary tube
Dryer AS Filter
Joints
5 % Ag 7 % points of Silver in solder
35 % Ag 5 % points of Silver in solder

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1.4.3. R EFRIGERANT CIRCUIT FLOW DIAGRAM
Pipe Suction Conn. Connessione Tubo Aspirazione
Suction Pipe Tubo di Aspirazione
Accumulator Accumulatore
Evaporator (LOW) Evaporatore (bassa pressione)
Capillary Tube Tube
Dryer Filter
Fridge Hot Pipe Tubo Caldo Frigo
Hot Pipe Conn. Tubo Caldo Connessione
Freezer Hot Pipe Tubo Caldo
Wire Conn. B B Connessioni B
Compressor (HIGH) Compressore (alta pressione)
1.4.4. T ECHNICAL S PECIFICATIONS
Item Index
Models MSZ 70 NF (T)
MSZ 70 NF HB (T)
ISO Internal volume (˜)
Freezer:
Fridge:
Total:
191
365
556
ISO Effective Capacity (˜)
Freezer:
Fridge:
Total:
174
339
513
OUTSIDE dimensions (mm) Width Depth
Height
928
801
1808
Refrigerant R134a 190 g
Cooling and Control System
Cooling
Defrost
Defrost Control
Fan Cooling System
Fan Evaporator Forced
Automatic start & stop
NET WEIGHT (kg) MSZ 70 NF (T)
MSZ 70 NF HB (T)
119
121

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1
1. .5 5. . P P
R
RO OG GR RA AM MS S A AN ND D
F
F
U
UN NC CT TI IO ON NS S
1.5.1. D ISPLAY / C ONTROL P ANEL
CONTROL INTERFACE Controlled Device
Temperature setting:
freezer - fridge - super freezer - super fridge
Request functions:
chilled water - ice-cubes/crushed ice - ice maker lock - water
filter reset
FTP LED
(Front Control Panel)
1. Normal operation:
1) Fridge/freezer temperature control
- Initial mode at freezer/fridge power-up -> Middle (-19°C / 2°C)
2) Super freeze - super cool LED -> OFF
3) Fuzzy, air treatment LEDs -> ON
4) Water LED -> ON, cubed ice / crushed ice LEDs -> OFF
5) Ice maker lock / reset water filter LEDs -> OFF
2. FREEZER SET button
1) Freezer temperature control,
2) Seven sequential temperature modes.
Default mode at power-up: "MID".
The letters are visible in the 88 Display LED
Temperature steps: Low Medium-
low Medium Medium - high 1
Medium-
high 2
Medium-
high 3 High
Temperature reading: -15°C -17°C -19°C -21°C -22°C -23°C -25°C

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3. SUPER FREEZE button
LED illuminates with mode selected.
4. FRIDGE SET button
1) Refrigerator temperature control
2) Five sequential temperature modes
Default mode at power-up: "MID".
The letters are visible in the 88 Display LED.
Temperature steps: Low Medium-
low Medium Medium- high High
Temperature reading: 4°C 3°C 2°C 1°C 0°C
5. Super Cool button
LED illuminates with mode selected.
6. Water / Cubed Ice / Crushed Ice button
1) Select water / Cubed ice / Crushed ice
2) LED illuminates to show active selection
Default mode at power-up: WATER
3) CUBED ICE or CRUSHED ICE function continues for 1 hour and then switches to WATER (WATER
LED illuminates)
7. Ice Maker Lock button
Start with ICE MAKER LOCK button
 ICE MAKER LOCK button is active (ON),
 WATER icon is always active (ON)
Stop by pressing ICE MAKER LOCK button again
 ICE MAKER LOCK LED is extinguished (OFF),
 WATER icon is active (ON).
8. Filter information
Normal filter conditions (LED OFF) proceed for six months from the first power-up
The LED illuminates after 6 months.
How to reset filter information
 Change the filter and then press the RESET WATER FILTER button and hold it down
for 5 seconds

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1.5.2. F REEZER T EMPERATURE C ONTROL (FC)
Input Controlled Device
1. FREEZER SET button
2. SUPER FREEZE button
3. Freezer probe
1. COMPRESSOR
2. FREEZER FAN
1. Press the FREEZER SET button to change the temperature mode
1. Low 2. Medium 3. Medium
low
4. Medium
high 1
5. Medium
high 2
6. Medium
high 3 7. High
2. The compressor and freezer fan are controlled by the ON / OFF setting of each mode
3. Freezer ON/OFF difference: 4°C
• Freezer mean OFF point: -21°C
• If TA </= 13°C, Freezer set is OFF, set-point increases by 2°C, fz. mean OFF point: -18°C.
4. Control point for each mode
Y axis = TEMPERATURE
X axis = Freezer
Functions
1. Low
2. Medium
3. Medium-low
4. Medium-high 1
5. Medium-high 2
6. Medium-high 3
7. High
Note: Delta T = 4 °C
Note: The DISPLAY readings are -15, -17, -19, -21, -22, -23, -25.

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1.5.3. S UPER F REEZE
1. The compressor and freezer fan run constantly for
approximately 150 min. irrespective of the freezer probe
reading.
2. The freezer fan functions at 14 V for the first 90 min
and then switches to 12 V
* ON/OFF DIFF.: preset by Microprocessor
* PHASE DIFF.: preset by Microprocessor
* Compressor and compressor fan connected
A. Freezer Fan
B. Freezer Sensor
1. Super Freeze Start
2. Fan RPM changeover point
3. Fan Normal Function
1.5.4. R EFRIGERATOR T EMPERATURE C ONTROL (RC)
Input Controlled Device
1. Fridge Set button
2. Super cool
3. Fridge probe (R)
1. COMPRESSOR
2. FRIDGE FAN
1. Pressing the button changes the temperature mode
1. Low 2. Medium 3. Medium
low
4. Medium
high 1
5. Medium
high 2
6. Medium
high 3 7. High
1. Low
2. Medium-low
3. Medium
4. Medium-high
5. High

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2. The fridge fan is controlled by the ON / OFF point of each mode.
3. Fridge DIFF. [ON / OFF] 0.5 °C
(mean OFF point: fridge: 1.3°C)
If TA </=13°C, FRIDGE SET is OFF, the set-point increases by 2°C and the mean OFF point of the fridge is
3.3°C.
4. Preventing low/insufficient refrigeration condition
 If a condition of insufficient refrigeration is detected the compressor will start, irrespective of the reading
of the Freezer probe.
 If the refrigerator probe reaches the fridge fan OFF point, the compressor is controlled by the
refrigerator probe and the fridge fan switches off.
 The insufficient refrigeration detection point is the OFF point of the refrigerator probe for each mode
+7°C.
 Stop position: same OFF point of the refrigerator probe as that of each mode.
5. Control point of each mode
Y axis = Temperature
X axis = Mode
A. Compressor ON alarm point with threshold
of compressor OFF +7°C
B. ON point. "Control" function of fridge fan
with fridge probe (fan at 12V or 14V).
C. OFF point
D. Phase Diff.
E. Phase Diff.
1. Low
2. Medium-low
3. Medium
4. Medium-high
5. High

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7. Quick refrigeration proceeds for 40 min.
*Temperature change example
(Fridge; Low (normal) -> Quick Refrigeration (Super cool)
Y axis = Temperature
X axis = Time
14V and 12V = fan speed
1) The fridge fan and compressor are active until the probe reaches the excess refrigeration OFF point (-7°C)
2) As soon as this point is reached HIGH mode is maintained until the end of the quick refrigeration cycle.
3) The temperature returns to normal mode after the end of the 40 minute QUICK REFRIGERATION cycle.
1.5.5. C ONTROL OF N ORMAL / L OAD / F AN MODES
Input Controlled Device
1. FRIDGE PROBE
2. FREEZER PROBE
1. Fridge/freezer fan (14V, 12V)
2. Condenser fan (12V, 10V)
Normal control: normal operating mode
Load control: operating mode when internal temperature is affected by an unusually large load of food or
frequent opening of the door.
1. Fan voltage for each control mode
Control mode Fridge fan Freezer fan Condenser fan
Normal 12V 12V 10V
Load control 14V 14V 12V
Super Freezer
function only

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2. Load control
1) Aim: Immediate restoral of set freezer/fridge temperature due to temperature rise caused by load
(excessive food quantity) and frequent door opening
2) Start conditions
Fridge/freezer door opening time is more than 30 seconds each time.
The fridge or freezer load control starts (depending on the case in question).
Higher than [Fridge probe ON point +5°C --> Fridge load control
Higher than [Freezer probe ON point +5°C --> Freezer load control
3) Conditions to avoid load control
Initial starting (at power-up)
- Initial starting (at power-up)
Immediately after the pre-cooling, evaporator defrost, defrost pause cycles.
After door opening load control starts checking for required conditions.
4) Control method
4-1) On the basis of the fridge / freezer door opening time (more than 30 seconds) the fridge /
freezer fan operates at 14 V
4-2) Freezer probe ON point + 5°C: freezer fan operates at 14 V
4-3) Control on basis of fridge probe ON point + 5°C. Fridge fan operates at 14V.
4-4) Condenser fan normally operates at 10V.
5) Stop conditions
- The mode proceeds for 20 min. If, at the end of the mode, another condition that requires it
should occur, the mode will restart automatically.
- When the position is reached (Freezer probe OFF point), freezer fan load control mode is
suspended.
- When the position is reached (Fridge probe OFF point), fridge fan load control mode is
suspended.
3. Mode control times diagram
1) Load control mode Start & Stop (Normal control)
Key:
Door
F/S
F Fan
R / S
R Fan
Door Open
30 sec. after Open
Load Mode Start
Ref Load Stop
Frz. Load Stop
Frz Overload Input
Frz. Start Condition
Frz. Stop: after 20m
Door
Freezer sensor
Freezer fan
Fridge sensor
Fridge fan
Doors open
30’’ after door open
Start fans 14V supply
Stop fridge fan
Stop Freezer fan
Start 5°C + ON freezer
Start FZ fan 14V
End 14V and start 12V

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2) Start & Stop of load control mode (normal defrost control).
Key:
HTR Defrost heating element
F/S Freezer sensor
Comp Compressor
F Fan Freezer fan
R / S Fridge sensor
R Fan Fridge fan
Defrosting Start Start of defrost
Condition to
start Load Mode,
but avoided during
defrosting mode
Compressor start condition
(+7°C off compr.); disabled
because in defrost mode
Ref. Load Mode
Ref. Load Stop
Start fridge fan 14 V
End fridge fan 14 V
Normal Operation on
+5 deg.
Condition for safety
activation (on compr.) and
fridge fan 14V