EPTA TANGO KW Series User manual

SERVICE MANUAL TANGO KW (short version) ENGLISH
Autori: Serralunga M.
16/07/2020
1
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TANGO 125 KW
TANGO 188 KW
TANGO 250 KW
Service Manual
COQ
Project:
IA27
TANGOKWServiceManual(shortversion)

SERVICE MANUAL TANGO KW (short version) ENGLISH
Autori: Serralunga M. 16/07/2020
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TABLE OF CONTENTS
1. AMOUNT OF REFRIGERANT IN THE EQUIPMENT 3
2. REFRIGERATION SCHEMATICS FOR THE EQUIPMENT 4
2.1. REFRIGERATION DIAGRAM TANGO 125 KW 4
2.2. REFRIGERATION DIAGRAM TANGO 188 KW 5
2.3. REFRIGERATION DIAGRAM TANGO 250 KW 6
2.4. VIEW OF THE MOTOR COMPARTMENT – TANGO 125 KW 7
2.5. VIEW OF THE MOTOR COMPARTMENT – TANGO 188 KW 8
2.6. VIEW OF THE MOTOR COMPARTMENT – TANGO 250 KW 9
2.7. VIEW OF THE EVAPORATOR COMPARTMENT AND RELEVANT PIPEWORK 10
3. POSITION OF PROBES IN THE CABINET 13
4. ALARMS FOR TANGO KW (Dixell controller) 14
5. REPLACEMENT OF COMPONENTS AND REPAIR A LEAK 14
5.1. SAFE OPERATING PROCEDURES FOR REFRIGERATION UNITS USING R290 14
5.2. PROTECTION TOOLS AND DEVICES FOR SERVICING 15
5.3. HOW TO EMPTY THE COOLING CIRCUIT AND PROVE IT BEFORE SERVICING 18
5.4. COMPRESSOR REPLACEMENT 19
5.5. UNSOLDER COPPER PIPE TUBE 20
5.6. COMPRESSOR REMOVING 20
5.7. NEWCOMPRESSORINSERTION 21
5.8. HIGH PRESSURE PIPE CLOSING 21
5.9. REFRIGERANT GAS CHARGING AND THERMODYNAMIC CIRCUIT CLOSING 22
5.10.CHECK THE CORRECT CLOSING OF THERMODYNAMIC CIRCUIT 25
5.11.REPLACEMENT OF CONDENSER MOTOR FAN 27
5.12.REPLACEMENT OF EVAPORATOR MOTOR FAN 27
5.13.REPLACEMENT OF POWER CORD REPLACING 28
5.14.REPLACEMENT OF ELECTRONIC CONTROLLER 28
5.15.
REPLACEMENT OF LED BARS 29
6.MAINCABINETFUNCTIONS 31
6.1. DISPLAY UNIT AND MAIN PARAMETERS 31
6.2. USEOFLEDS 31
6.3. TANGOKWPARAMENTERS 32
6.4. TEMPERATURESETTING 33
7.WIRINGDIAGRAM 34
7.1. WIRING DIAGRAM LEGEND 34
7.2. TANGO 125 KW WIRING DIAGRAM 34
7.3. TANGO 188 KW WIRING DIAGRAM 35
7.4. TANGO 250 KW WIRING DIAGRAM 36

SERVICE MANUAL TANGO KW (short version) ENGLISH
Autori: Serralunga M.
16/07/2020
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1. AMOUNT OF REFRIGERANT IN THE EQUIPMENT
The most prominent feature of the TANGO KW versions is that they use a natural gas: propane (R290).
MODEL
AMOUNT OF
PROPANE*
[
g
rams] 
TANGO 125 KW
150
TANGO 188 KW
150
TANGO 250 KW
300
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(*) The propane refrigerant R290 to be used must be technical-gas rated, with purity grade above 99,5%.
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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 chest of a TANGO KW, this would be a flammability
zone event.
39g/m3177g/m3
Striking will not cause
flames Striking will not cause
flames
0% Striking will not cause
flames
100%

SERVICE MANUAL TANGO KW (short version) ENGLISH
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2. REFRIGERATION SCHEMATICS FOR THE EQUIPMENT
2.1 REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
TANGO 125 KW
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.

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2.2 REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
TANGO 188 KW
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.

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2.3 REFRIGERATION DIAGRAM FOR THE COOLING CYCLE
TANGO 250 KW
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Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.
Point into which
nitrogen needs to be
blown to remove
propane from the
pipework.

SERVICE MANUAL TANGO KW (short version) ENGLISH
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2.4 VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
TANGO 125 KW
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CONDENSER
EVAPORATING WATER
TRAY
CONDENSER MOTOR
FANCONDENSER MOTOR
FAN
COMPRESSOR
DISCHARGE LINE DISCHARGE LINE
FILTER DRYER
CAPILLARY
CHARGE TUBE
INVERTER

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2.5 VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
TANGO 188 KW
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CONDENSER
DISCHARGE LINE
FILTER DRYER
EVAPORATING WATER
TRAY
DISCHARGE LINE
CAPILLARY
CONDENSER MOTOR
FAN
COMPRESSOR
CHARGE TUBE
INVERTER

SERVICE MANUAL TANGO KW (short version) ENGLISH
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2.6 VIEW OF THE MOTOR COMPARTMENT AND RELEVANT PIPEWORK
TANGO 250 KW
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DISCHARGE LINE DISCHARGE LINE
DISCHARGE LINE
EVAPORATING WATER
TRAY
CONDENSER MOTOR
FAN
COMPRESSOR
CHARGE TUBE CONDENSER MOTOR
FAN
CONDENSER
DISCHARGE LINE
FILTER DRYER
FILTER DRYER
INVERTER

SERVICE MANUAL TANGO KW (short version) ENGLISH
Autori: Serralunga M. 16/07/2020
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2.7 VIEW OF THE EVAPORATOR COMPARTMENT AND RELEVANT
PIPEWORK
The refrigerator is supplied of shelves with adjustable stirrup: their position in the tank can be set as
desired by moving the shelf supports on the fixed racks inside the tank.
On the bottom of the tank there is the evaporator cover under which the internal motor fans, protection
grills is secured.
Under the cover are placed the finned evaporator.
TANGO 125 KW
CAPILLARY –
EVAPORATOR INPUT
DEFROST PROBE
SUCTION PIPE –
EVAPORATOR OUTLET
TEMPERATURE PROBE

SERVICE MANUAL TANGO KW (short version) ENGLISH
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TANGO 188 KW
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CAPILLARY –
EVAPORATOR INPUT
SUCTION PIPE –
EVAPORATOR OUTLET
DEFROST PROBE
TEMPERATURE PROBE

SERVICE MANUAL TANGO KW (short version) ENGLISH
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TANGO 250 KW
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CAPILLARY –
EVAPORATOR INPUT
SUCTION PIPE –
EVAPORATOR OUTLET
DEFROST PROBE
TEMPERATURE PROBE

SERVICE MANUAL TANGO KW (short version) ENGLISH
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3. POSITION OF PROBES IN THE CABINET
There are two probes in the TANGO KW models.
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Model Position of
probe
Probe
Colour Function Probe Epta code
TANGO 125 KW
TANGO 188 KW
Evaporator
Tank
Yellow
Black
Defrost
Display - Thermostat
I0205778
140692
TANGO 250 KW Evaporator
Tank
Yellow
Black
Defrost
Display - Thermostat
I0205780
140692
Position of probe
touching
Position of probe
touching
Position of probe
touching

SERVICE MANUAL TANGO KW (short version) ENGLISH
Autori: Serralunga M.
16/07/2020
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4. ALARMS FOR TANGO KW (Dixell Contreller)
ALARM CAUSE OUTPUTS
“P1” Temperature probe damage “Con” and “COF” compressor outputs.
“P2” Evaporator probe damage Timed defrosting
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5. REPLACEMENT OF COMPONENTS AND REPAIR OF A LEAK
The instructions below, which involve opening the refrigeration circuit, must be performed in a
place with sufficient air circulation and at any rate not in the sales area.
5.1 SAFE OPERATING PROCEDURES FOR REFRIGERATION UNITS
USING R290
Before carrying out any kind of maintenance operation on the refrigerator, make sure that the
machine is disconnected from power (unplugged).
R290 (Propane CH3CH2CH3) is a flammable natural refrigerant (Hydrocarbon HC) having
lower explosive limit ( LEL %V/V) = 1.7.
The very low quantity of refrigerant used and the safe design (possible ignition sources
enclosed in a metal box, far from the potential explosive areas) make this unit totally safe in
use. Caution must be used during servicing and with this respect it is essential to understand
the basic concept of flammability.
Three ingredients are needed for a fire: a fuel at the right concentration, a supply of oxygen
normally from air, and a source of ignition. The common way of illustrating this is by means of
the fire triangle.
If you control these components, for example, by eliminating at least one but preferably two
of these, fire can be prevented.
In order to achieve this, three general guidelines should be followed during servicing:
F1. Containment of the substance;
F2. Avoidance of ignition sources;
F3. Use of ventilation.
F1. Containment
The flammable substances must be kept within a suitably designed and constructed
“container”, be it a suitable cylinder or a refrigeration system. If the substance leaks, it should
be prevented from spreading to other areas.

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F2. Ignition sources
Ensure that all the obvious and unobvious ignition sources have been removed from the
equipment and handling areas. Ignition sources can vary greatly and these sources may
include sparks from electrical equipment or welding and cutting tools, hot surfaces, open
flames from heating equipment, smoking materials, etc.
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F3. Ventilation
There should be adequate airflow where flammable substances are stored and used.
Good ventilation will mean that any vapor arising from a leak or a release will be rapidly
dispersed. In case one of the components of the refrigerating hermetic circuit (compressor,
dryer, condenser, evaporator, capillary, refrigerant) needs to be serviced, the basic safe
guideline must be always followed:
NEVER USE FLAMES OR HEAT SOURCES IF
FLAMMABLE REFRIGERANT IS PRESENT
INSIDE THE REFRIGERATING CIRCUIT
Flames can be used only when there is evidence that no flammable substance is still inside the
circuit or the circuits; IN CASE OF MULTIPLE CIRCUITS NONE OF THEM MUST CONTAIN
FLAMMABLE SUBSTANCES in case heat sources are to be used: all circuits need to be emptied
and absence of flammable substances must be proved.
IMPORTANT
Provisions for all jobs involving the opening of the refrigerating circuit:
‐SHUT DOWN THE POWER SUPPLY
‐MANDATORILY WEAR GLOVES AND GLASSES
‐DO NOT WORK WITH OPEN FLAMES BEFORE THE PIPEWORK HAS BEEN CUT!
‐REMOVE ALL SPARK SOURCES FROM THE WORK AREA (LIGHTERS, LAMPS,
CIGARETTES).
5.2 PROTECTION TOOLS AND DEVICES FOR SERVICING
Protection tools:
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Devices for servicemen:
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LOWPRESSURE
SUCTIONGAUGE
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REFRIGERANTPINCH
OFFTOOL
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ELECTRONICLEAK
DETECTOR
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REFRIGERAT
JUNCTIONS
LOCKRINGJOINT
PLIER
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LOCKRINGJOINT
WITHCLOSEDSIDE
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REFRIGERANTGAS
BOTTLE
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NITROGENGAS
BOTTLE

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REFRIGERANTSCALE
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VACUUMPUMP
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LOKPREPSEALANT
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ORBITALCUTTER
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SCREWDRIVER
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WRENCHn°10
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SERVICE MANUAL TANGO KW (short version) ENGLISH
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5.3 HOW TO EMPTY THE COOLING CIRCUIT AND PROVE IT BEFORE
SERVICING
The refrigerating unit has a double servicing pipe, on the low (A) and on the high (B) pressure
sides: in order to totally remove the flammable refrigerant from the refrigerating circuit both
pipes are to be opened by using an orbital cutter (C).
Cut the capillary tube (D) exiting the filter dryer.
When the inside pressure is equalized with the ambient pressure, blow nitrogen at 10 bars in
the circuit through the service pipe on high pressure side (B) and check that it flows out through
the other service pipe on the low pressure side; continue to blow nitrogen for at least 5 minutes.
At the end of this procedure NO FLAMMABLE REFRIGERANT CAN REMAIN INSIDE THE
CIRCUIT IN SUCH A QUANTITY TO BE DANGEROUS WHEN FLAMES OR HEAT
SOURCES ARE USED.
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5.4 COMPRESSOR REPLACEMENT
n
i
t
r
o
g
e
n
A
C
B
D
Also cut the pipe
entering the filter
and replace the
filter dryer with a
new one.
Picture example
of motor
compartment

SERVICE MANUAL TANGO KW (short version) ENGLISH
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TANGO 125 KW
TANGO 188 KW
Epta code: 45911034
Model: SECOP NLV12.6CN 198-254V 50/60HZ
TANGO 250 KW
Epta code: 45911034 (2 Pc)
Model: SECOP NLV12.6CN 198-254V 50/60HZ
Epta code for filter: 46363000
Model: Filter gr 20 øi 6.2-3.2
Note: when the compressor is replaced the filter drier must be replaced too

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5.5 UNSOLDER COPPER PIPE TUBE
After being that no more refrigerant gas is inside the thermodynamic circuit, unsolder from
compressor the charge pipe (A), the suction pipe (1) and the discharge pipe (2).
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5.6 COMPRESSOR REMOVING
Unscrew the 4 screws of compressor by using the wrench n°10.
Using the screwdriver for unscrew the compressor box (if present).
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A
1 2
Picture example
of motor
compartment