EPTA VALZER KW User manual
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M.
14/10/2021
1
NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
VALZER KW
Service Manual
COQ
Project:
VALZERKWServiceManual(shortversion)
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
2
NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
TABLE OF CONTENTS
1. AMOUNT OF REFRIGERANT IN THE EQUIPMENT 3
2. REFRIGERATION SCHEMATICS FOR THE EQUIPMENT 4
2.1. REFRIGERATION DIAGRAM VALZER KW 2D 4
2.2. REFRIGERATION DIAGRAM VALZER KW 3D 5
2.3. REFRIGERATION DIAGRAM VALZER KW 4D 7
2.4. REFRIGERATION DIAGRAM FOR DEFROST CYRCLE VALZER KW 2D 9
2.5. REFRIGERATION DIAGRAM FOR DEFROST CYRCLE VALZER KW 3D 10
2.6. REFRIGERATION DIAGRAM FOR DEFROST CYRCLE VALZER KW 4D 12
2.7. VIEW OF MOTOR COMPARTMENT – VALZER KW 2D 14
2.8. VIEW OF MOTOR COMPARTMENT – VALZER KW 3D 16
2.9. VIEW OF MOTOR COMPARTMENT – VALZER KW 4D 18
2.10. VIEW OF THE EVAPORATOR COMPARTMENT – VALZER KW 2D 19
2.11. VIEW OF THE EVAPORATOR COMPARTMENT – VALZER KW 3D 19
2.12. VIEW OF THE EVAPORATOR COMPARTMENT – VALZER KW 4D 20
3. POSITION OF PROBE IN THE CABINET 21
4. ALARMS FOR MULTIFREEZ PLUS (Dixell Controller) 22
5. REPLACEMENT OF COMPONENTS 22
5.1. SAFE OPERATING PROCEDURES FOR REFRIGERAION UNIT USING R290 22
5.2. PROTECTION TOOLS AND DEVICES FOR SERVICEMENT 23
5.3. HOW TO EMPTY THE COOLING CIRCUIT AND PROVE IT BEFORE SERVICING 26
5.4. COMPRESSOR REPLACEMENT 27
5.5. UNSOLDER COPPER PIPE TUBE 28
5.6. COMPRESSOR REMOVING 28
5.7. NEW COMPRESSOR INSERTION 29
5.8. HIGH PRESSURE PIPE CLOSING 29
5.9. REFRIGERANT GAS CHARGING AND THERMODYNAMIC CIRCUIT CLOSING 31
5.10. CHECK THE CORRECT CLOSING OF THERMODYNAMIC CIRCUIT 34
5.11. REPLACEMENT OF CONDENSER MOTOR FAN 36
5.12. REPLACEMENT OF EVAPORATOR MOTOR FAN 37
5.13. REPLACEMENT OF CONTROLLER SOLENOID VAVE 39
5.14. REPLACEMENT OF ELECTRONIC CONTROLLER 40
5.15. REPLACEMENT OF LED BAR 41
5.16.DOORREPLACEMENT 42
6.INVERTERINFORMATION 46
6.1. LED INDICATION 46
6.2. INVERTER TROUBLESHOOTING 46
7.MAINCABINETFUNCTIONS 47
7.1. DISPLAY UNIT AND MAIN PARAMETERS 47
7.2.USEOFLEDS 47
7.3. TEMPERATURE SETTING 48
7.4. VALZER KW 2D ELECTRONIC CONTROLLER PARAMETERS 49
7.5. VALZER KW 3D ELECTRONIC CONTROLLER PARAMETERS 50
7.6. VALZER KW 4D ELECTRONIC CONTROLLER PARAMETERS 51
8.WIRINGDIAGRAM 52
8.1. VALZER KW 2D WIRING DIAGRAM 52
8.2. VALZER KW 3D WIRING DIAGRAM 53
8.3. VALZER KW 4D WIRING DIAGRAM 54
8.4. WIRING DIAGRAM LEGEND 55
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M.
14/10/2021
3
NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
1.
AMOUNT OF REFRIGERANT IN THE EQUIPMENT
The most prominent feature of the VALZER KW versions is that they use a natural gas: propane
(R290).
MODEL
AMOUNT OF
PROPANE*
[
g
rams] / [Ounce]
VALZER KW 2D
150 / 5,29
VALZER KW 3D
150 + 150 /
5,29+5,29
VALZER KW 4D
150 + 150 /
5,29+5,29
(*) The propane refrigerant R290 to be used must be technical-gas rated, with purity grade above 99,5%.
PROPANE IS HEAVIER THAN AIR, WHICH MEANS THAT IT WILL
TEND TO CONCENTRATE NEAR THE FLOOR OF THE ROOM.
The flammability limit percentage (in a volume of air) is between 2,2% and 9,2% (at 25°C and 1bar).
In mass terms:
If the entire amount of refrigerant is released in the food compartment of VALZER KW, this would become
a flammable zone.
39
g
/m3177
g
/m3
Striking will not cause
flames Striking will not cause
flames
0% Striking will not cause
flames
100%
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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2. REFRIGERATION SCHEMATICS FOR THE EQUIPMENT
2.1
REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
VALZER KW 2D
The compressor runs warm gas through evaporating tray, condensers and frame pipe.
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.2
REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
VALZER KW 3D
The compressor runs warm gas through evaporating tray, condensers and frame pipe.
GROUP 1
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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GROUP 2
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.3
REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
VALZER KW 4D
The compressor runs warm gas through evaporating tray, condensers and frame pipe.
GROUP 1
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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GROUP 2
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.4
REFRIGERATION DIAGRAM FOR THE DEFROST CYCLE
VALZER KW 2D
The NC solenoid valve opens and allow gas to run through the drip tray serpentine and then into the
evaporator.
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.5
REFRIGERATION DIAGRAM FOR THE DEFROST CYCLE
VALZER KW 3D
The NC solenoid valve opens and allow gas to run through the drip tray serpentine and then into the
evaporator.
GROUP 1
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
GROUP 2
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.6
REFRIGERATION DIAGRAM FOR THE DEFROST CYCLE
VALZER KW 4D
The NC solenoid valve opens and allow gas to run through the drip tray serpentine and then into the
evaporator.
GROUP 1
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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GROUP 2
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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2.7
VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
VALZER KW 2D
VIEW OF MOTOR COMPARTMENT – FRONT SIDE
VIEW OF MOTOR COMPARTMENT – REAR SIDE
CONDENSER MOTOR
FAN
CONDENSER MOTOR
FANFILTER DRYER
FRAME HEATING PIPE
SUCTION PIPE –
EVAPORATOR OUTLET
FRAME HEATING PIPE
DRIP TRAY
SERPENTINE
COMPRESSOR
SOLENOID VALVE
SERVICE TUBE
EVAPORATING WATER
TRAY
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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VIEW OF MOTOR COMPARTMENT – MOTOR HOUSING
SERVICE TUBE
SOLENOID VALVE
CONDENSER MOTOR
FAN
COMPRESSOR –
SUCTION PIPE
COMPRESSOR
INVERTER
CONDENSERS
EVAPORATING WATER
TRAY
FRAME HEATING PIPE
- CONDENSER
CONDENSER MOTOR
FAN
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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2.8
VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
VALZER KW 3D
VIEW OF MOTOR COMPARTMENT – FRONT SIDE
VIEW OF MOTOR COMPARTMENT – REAR SIDE
CONDENSER MOTOR
FAN
CONDENSER MOTOR
FAN
FILTER DRYER FILTER DRYER
FRAME HEATING PIPE FRAME HEATING PIPE
SUCTION PIPE –
EVAPORATOR OUTLET
FRAME HEATING PIPE
DRIP TRAY
SERPENTINE
COMPRESSOR SOLENOID VALVE
FRAME HEATING PIPE
SUCTION PIPE –
EVAPORATOR OUTLET
DRIP TRAY
SERPENTINE
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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VIEW OF MOTOR COMPARTMENT – MOTOR HOUSING
SERVICE TUBE
VACUUM TUBE
SOLENOID VALVE
CONDENSER
CONDENSER
SERVICE TUBE
COMPRESSOR
INVERTER
EVAPORATING WATER
TRAY
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
18
NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.9
VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
VALZER KW 4D
VIEW OF MOTOR COMPARTMENT – MOTOR HOUSING
COMPRESSOR
SERVICE TUBE
SOLENOID VALVE EVAPORATING WATER
TRAY
CONDENSER
CONDENSER
INVERTER
VACUUM TUBE
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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2.10
VIEW OF THE EVAPORATOR COMPARTMENT AND RELEVANT
PIPEWORK – VALZER KW 2D
2.11
VIEW OF THE EVAPORATOR COMPARTMENT AND RELEVANT
PIPEWORK – VALZER KW 3D
DRIP TRAY
SERPENTINE
DRIP TRAY SEPRENTINE –
SOLENOID VALVE
SUCTION PIPE –
EVAPORATOR OUTLET
CAPILLARY –
EVAPORATOR INPUT
DEFROST PROBE
SUCTION PIPE –
EVAPORATOR OUTLET
DRIP TRAY
SERPENTINE
DEFROST PROBE
DRIP TRAY SERPENTINE –
SOLENOID VALVE
CAPILLARY –
EVAPORATOR INPUT
CAPILLARY –
EVAPORATOR INPUT
SERVICE MANUAL VALZER KW (short version) inglese
Autori: Serralunga M. 14/10/2021
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NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION FROM EPTA QUALITY MANAGEMENT
2.12
VIEW OF THE EVAPORATOR COMPARTMENT AND RELEVANT
PIPEWORK – VALZER KW 4D
DRIP TRAY
SERPENTINE
DRIP TRAY SEPRENTINE –
SOLENOID VALVE
CAPILLARY –
EVAPORATOR INPUT
SUCTION PIPE –
EVAPORATOR OUTLET
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