TEXA Konfort 700R Series User manual

Konfort Series 700R Service Manual TEXA Technical Assistance
I
Copyright © 20 4 – TEXA S.p.A.
TABLE OF CONTENTS
INTRODUCTION ………………………………………………………………… 1
GENERAL SAFETY ………………………………………………………………. 2
CHAPTER 1 – COMPARISON BETWEEN R1234yf AND R134a
REFRIGERANTS ………………………………………………………………… 4
1.1 Introduction to the Greenhouse Effect ………………………………………… 4
1.2 The Directive 2006/40/CE ……………………………………………………………… 4
1.3 Features of the ne refrigerant R1234yf …………………………………… 5
1.4 The TEXA solution: Konfort series 700R ……………………………………… 7
CHAPTER 2 – GENERAL WOR ING PRINCIPLE ……………………. 9
2.1 Introduction …………………………………………………………………………………… 9
2.2 Detailed description of the single phases …………………………………… 11
2.2.1 Refrigerant Recovery …………………………………………………………… 11
2.2.2 Oil Drain …………………………………………………………………………… 13
2.2.3 Vacuum ………………………………………………………………………………… 13
2.2.4 Leak Test ……………………………………………………………………………… 15
2.2.5 Oil njection ………………………………………………………………………… 15
2.2.6 UV njection ………………………………………………………………………… 16
2.2.7 Refrigerant njection …………………………………………………………… 17
2.3 The Evolution of the BiGas management: refrigerant recovery
and injection into Konfort 780R units ……………………………………… 18
2.3.1 Recovery of R134a refrigerant ………………………………………… 18
2.3.2 Recovery of R1234yf refrigerant ……………………………………… 20
2.3.3 Refrigerant R134a injection ……………………………………………… 22
2.3.4 Refrigerant R1234yf injection ……………………………………………… 23
2.4 Refrigerant Recovery on Konfort 705R ………………………………………… 24
CHAPTER 3 – ONFORT SERIES 700R: NEW ARCHITECTURE OF
THE MENU ………………………………………………………………………… 26
3.1 Konfort 705R, 710R, 720R: Text menu on blue LCD display …… 26
3.1.1 The AC maintenance menu …………………………………………………… 27
3.1.2 The Additional functions menu …………………………………………… 28
3.1.3 The Settings menu …………………………………………………………… 29
3.1.4 The Service menu ………………………………………………………………… 30
3.2 Konfort 760R, 760R Bus and 780R BiGas: Graphic menu on
color display ……………………………………………………………………………… 31
3.2.1 The AC maintenance menu …………………………………………………… 32
3.2.2 The Additional functions menu …………………………………………… 33
3.2.3 The Settings menu ………………………………………………………………… 36
3.2.4 The Service menu ……………………………………………………………… 37
CHAPTER 4 – THE SERVICE MENU ………………………………………. 38
4.1 The Service menu …………………………………………………………………………… 38
4.2 The “POWER OUTPUTS” function on K705R, K710R, K720R …… 42
4.3 The “POWER OUTPUTS” function on Konfort 760R, 760R Bus or
780R BiGas …………………………………………………………………………… 48
4.4 The “SENSOR CALIBRATION” function on K705R, K710R, K720R 52
4.4.1 “REFR GERANT” calibration on K705R, K710R and K720R 52
4.4.2 “UV ADD T VE” calibration on K710R and K720R ………… 58
4.4.3 “NEW O L” calibration on K705R, K710R and K720R ……… 58
4.4.4 “MA N SENSOR” calibration on K705R, K710R and K720R 58

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4.4.5 “SECONDARY SENSORS” calibration on K705R, K710R,
K720R ……………………………………………………………………………………………… 61
4.5 The “SENSOR CALIBRATION” function on Konfort 760R, 760R
Bus and 780R BiGas …………………………………………………………………… 62
4.5.1 “REFR GERANT” calibration on Konfort 760R and 760R
Bus …………………………………………………………………………………………………… 62
4.5.2 “REFR GERANT” calibration on Konfort 780R BiGas ………… 68
4.5.3 “RECOVERED O L” calibration on Konfort 760R, 760R Bus
and 780R BiGas …………………………………………………………………………… 76
4.5.4 “UV ADD T VE” calibration on Konfort 760R, 760R Bus
and 780R BiGas …………………………………………………………………………… 80
4.5.5 “NEW O L” calibration on Konfort 760R, 760R Bus and
780R BiGas ………………………………………………………………………………… 81
4.5.6 “MA N SENSOR” calibration on Konfort 760R, 760R Bus
and 780R BiGas ………………………………………………………………………… 81
4.5.7 “SECONDARY SENSORS” calibration on Konfort 760R,
760R Bus and 780R BiGas ………………………………………………………… 85
4.6 “PRIVATE PARAMETERS” function on Konfort 700R units ………… 85
4.6.1 List of the private parameters for Konfort 705R …………… 85
4.6.2 List of the private parameters for Konfort 710R …………… 86
4.6.3 List of the private parameters for Konfort 720R …………… 87
4.6.4 List of the private parameters for Konfort 760R …………… 87
4.6.5 List of the private parameters for Konfort 760R Bus …… 88
4.6.6 List of the private parameters for Konfort 780R BiGas … 89
4.7 “PUBLIC PARAMETERS” function on Konfort 700R units ………… 89
4.7.1 List of the public parameters for Konfort 705R ……………… 90
4.7.2 List of the public parameters for Konfort 710R ……………… 91
4.7.3 List of the public parameters for Konfort 720R ……………… 92
4.7.4 List of the public parameters for Konfort 760R ……………… 93
4.7.5 List of the public parameters for Konfort 760R Bus ……… 94
4.7.6 List of the public parameters for Konfort 780R BiGas …… 95
4.8 “CALIBRATION STATUS” function on Konfort 700R units ……… 95
4.9 “SELECT REFRIGERANT” function on Konfort 700R units ……… 97
4.10 “STORED ERRORS” function on Konfort 700R units ……………… 97
4.11 “DEFAULT PARAMETERS” function on Konfort 700R units …… 99
4.12 “CUSTOMISED SERVICE” function on Konfort 700R units ……… 100
CHAPTER 5 – ORDINARY MAINTENANCE …………………………… 104
5.1 Main Filter Replacement ……………………………………………………………… 104
5.2 Vacuum Pump Oil Replacement …………………………………………………… 110
CHAPTER 6 – SOFTWARE UPDATE ……………………………………… 113
6.1 Manual update of the soft are packages in the SD card …………… 114
6.2 Automatic update by means of Konfort 700 Updater ………………… 116
CHAPTER 7 – TROUBLE SHOOTING ……………………………………. 122
7.1 Introduction …………………………………………………………………………………… 122
7.2 The equipment does not s itch on ……………………………………………… 123
7.3 The display of the Konfort unit does not visualize correctly …… 126
7.4 The unit does not recover refrigerant …………………………………… 130
7.5 The unit does not perform the vacuum ……………………………………… 136
7.6 The unit does not inject oil ………………………………………………………… 140
7.7 The unit does not inject UV additive …………………………………………… 142
7.8 Too much oil and/or UV additive is injected ……………………………… 143
7.9 The equipment does not inject refrigerant ……………………………… 146
7.10 The unit injects a larger amount of refrigerant ……………………… 148

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7.11 The recovered oil is not discharged into the DRAIN bottle …… 150
7.12 The main load cell is not properly calibrated …………………………… 151
7.13 The auxiliary load cells are not properly calibrated ………………… 152
7.14 The main pressure sensor is not properly calibrated …………… 152
APPENDX 1 – SPARE PARTS PORTAL ………………………………… 154
APPENDX 2 – ELECTRICAL AND SIGNAL CONNECTIONS ……….. 155
APPENDIX 3 – FLOW DIAGRAMS ………………………………………… 165
APPENDIX 4 – SOLENOID VALVES LOCATION ……………………… 169

Konfort Series 700R Service Manual TEXA Technical Assistance
Copyright © 20 4 – TEXA S.p.A.
INTRODUCTION
This manual is intended to simplify routine and extraordinary
maintenance on the ne air-conditioning recharging units Konfort 700R
series.
The first chapter of this manual ill aim to compare the features of the
t o refrigerants R134a and R1234yf in relation to their use in air-
conditioning systems and, therefore, in the ne Konfort 700R series
equipments.
Since any type of assistance operation is not possible ithout an
excellent kno ledge of the equipment (in particular, of the components
involved during its operating cycle), in the next chapter plenty space ill
be given to the description of each component involved in the cycle,
firstly starting ith a description of the overall operation, then gradually
giving further details to the description.
In particular, the ay in hich Konfort 780R BiGas equipments are able
to do the s itch bet een the t o types of refrigerant ill be analyzed.
The third chapter ill describe the main functions of the menu of the
Konfort 700R series equipments.
In the fourth chapter, then, the features of the Service menu of the
equipments ill be carefully described. Particular attention ill be given
to the section hich allo s to check the functioning of the sensors and
actuators of the Konfort unit. Furthermore, a detailed description of the
ne calibration procedures of the equipment’s sensors ill be provided.
The fifth chapter ill provide a brief description of the main ordinary
maintenance operations hich ill have to be periodically performed on
the equipment.
The sixth chapter explains the procedures that are necessary to follo to
perform the soft are updates required during the normal service and
assistance operations on the equipment.
Finally, the seventh chapter ill revie in detail the techniques of
diagnosis and resolution of problems you might encounter in the ork of
maintaining of Konfort equipments, produced by TEXA S.p.A. The goal is
that of providing an easy-to-use trouble shooting, here each problem is
separately dealt, leading the reader to its correct solution.

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GENERAL SAFETY
onfort 700R series equipments are intended for qualified
personnel, ho must demonstrate to have a basic kno ledge of the
principles of refrigeration, of the operation of refrigeration systems,
of the physical properties of refrigerants and of the potential dangers
hich equipments under high pressure could cause.
onfort 700R series units are equipped ith the follo ing safety
devices:
-Safety pressure s itch: it stops the compressor hen action
pressure (19 Bars) has been reached.
-Safety valve: it is fully open if the action value (20 Bars) is
reached.
-Po er supply line fuses: they allo the interruption of the po er
supply in case of overload by any device.
Any type of tampering of the above mentioned safety devices is
strictly forbidden. TEXA S.p.A. declines any liability for
damages to people or things produced by not approved
alterations, even partial, performed on the equipment.
The onfort 700R series equipments are designed and constructed
to treat exclusively ith the refrigerant R134a or ith refrigerant
R1234yf. Their use is not approved ith any other kind of gas.
-The coolant fluid removed from an A/C system must be handled
ith extreme caution, in order to avoid any possible refrigerant
output to the open air.
-The tanks used for storing refrigerants must be dedicated each to
a particular cooling fluid, in order to avoid any possible mixing
bet een R134a and R1234yf. For any further information about
the precautions to adopt, refer to the safety sheets released by
the refrigerant fluid manufacturers.
-The tanks must be clean and clearly marked, in order to identify
the type of refrigerant inside them.
-It is absolutely forbidden to use external tanks or other storage
containers ithout homologation and not equipped ith safety
valves.
It’s mandatory to guard the equipments during their operation.
It’s mandatory to ear suitable protective clothes, like glasses and
gloves. The refrigerant liquids could cause physical injuries (i.e.
blindness). Due to their lo boiling temperature (about -30 °C), the
contact ith the skin may cause cold burns to the operator.
Avoid the inhalation of refrigerants’ vapors.

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Some air and R134a mixtures have been sho n to be combustible at
high pressures. These mixtures are potentially dangerous and may
generate fire or explosion, thus causing personal injuries and
damage. In addition, the refrigerant R1234yf is classified as
flammable. For these reasons, it is absolutely forbidden to use the
equipment near open flames, hot surfaces or any other possible
source of ignition.
Caution: Before performing any kind of reparation or component
replacement on the equipment, disconnect the it from the external
po er supply.
Caution: It is al ays recommended to depressurize the equipment
before making any maintenance or component replacement on it.
Caution: Before disconnecting the equipment from the vehicle, make
sure that every step of the service has been completed and that all
valves are closed, in order to prevent any possible release of
refrigerant into the atmosphere.
Caution: The hoses can contain refrigerant under pressure.
Disconnect the hoses ith extreme care and, any ay, al ays after a
proper depressurization of the equipment.
Caution: When the hoses are rolled onto their lateral support and the
rapid connectors are attached to their supports, be sure that the
connectors themselves ill not be open.

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CHAPTER 1 – COMPARISON BETWEEN R1234yf AND
R134a REFRIGERANTS
1.1 Introduction to the Greenhouse Effect
The greenhouse effect is the natural principle that refers to the ability
of a planet's atmosphere to retain the heat from the Sun. Thanks to the
greenhouse effect, the development of life on Earth is possible, because
the typical temperature imbalances of the celestial bodies ith no
atmosphere are avoided.
The atmospheric gases hich are responsible for this natural phenomenon
are called greenhouse gases, and they have the property of being
transparent to incoming solar radiation on the Earth but they can hold,
in a consistent manner, the infrared radiation emitted by the Earth's
surface, by the atmosphere and by the clouds.
Water vapor (H
2
O), carbon dioxide (CO
2
), nitrous oxide (N
2
O) and
methane (CH
4
) are the main greenhouse gases in the Earth’s atmosphere.
Ozone (O
3
), hich is often listed as a greenhouse gas, is not exactly one
of them: its action in the atmosphere, in fact, is mainly "cooling",
because it acts as a filter against the solar UV rays.
The air pollution, due to the continuous and increasing combustion of fossil
fuels, the emission of chlorofluorocarbons (CFCs) and hydrofluorocarbons
(HFCs) leads to an increase of the greenhouse gases in the atmosphere
(especially CO
2
, N
2
O and CH
4
) and, at the same time, a thinning of the
ozone layer. This leads to an abnormal increase in global temperature,
ith consequences in the medium/long term hich are still unpredictable
(extreme eather conditions, such as hurricanes, storms and floods).
The refrigerants used in cars’ air conditioning systems can also contribute
to this abnormal increase of the greenhouse effect. In order to quantify
the impact of each type of refrigerant on raising global temperatures, a
number of parameters are used, including the GWP (Global Warming
Potential). As benchmark for the calculation of this parameter, the CO
2
is
taken into account (namely, the GWP value for each gas is defined ith
reference to that of CO
2
).
1.2 The Directive 2006/40/CE
With the Directive 2006/40/EC the European Community requires that,
starting from January 1
st
, 2011, all the Member States will no longer
have the chance to grant EC type-approvals or national type-
approvals for vehicles hich are equipped ith air conditioning systems
designed to contain fluorinated greenhouse gases ith a GWP> 150.

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The directive also requires that, starting from January 1
st
, 2017, all the
ne registered cars ill be prohibited to have air-conditioning systems
containing fluorinated gases ith GWP> 150.
The refrigerant R134a, hich is currently used in the A/C systems of
vehicles ith a mass less than 3,5 tones, has a GWP factor = 1400: this
means that its global arming potential is 1400 times higher than the
one of carbon dioxide.
According to the ne constraints imposed by the EU Directive, the ne
refrigerant that has been established for the air conditioning systems of
ne registration vehicles ill be the R1234yf, because characterized by
a very lo global arming potential (GWP = 4).
Refrigerant GWP
R134a 1400
R1234yf 4
CO
2
1
Table 1.1 – GWP coefficients of the t o refrigerants
compared to that of carbon dioxide
1.3 Features of the new refrigerant R1234yf
The decision to opt for the ne refrigerant R1234yf is dictated by some of
its interesting features:
excellent environmental properties in relation to the greenhouse
effect (GWP=4).
reduced levels of acute and chronic toxicity, such as the ones of
R134a. The refrigerant R1234yf does not constitute any risk of
exposure due to chemical toxicity.
very similar performances to the ones of R134a: R1234yf is
thermally stable and compatible ith R134a system components. This
can lead to a potential direct replacement of the refrigerant in current
systems employing R134a (through appropriate conversion kits).
slight flammability: R1234yf is classified as a slightly-flammable
liquid. Ho ever, even if ignited, this refrigerant ould burn only
eakly, ith very limited effects. That flammability ould be,
therefore, absolutely manageable.

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Properties R1234yf R134a
Boiling point T
B
-29°C -26°C
Critical point T
C
95°C 102°C
P
VAP
MPA (25°C) 0,677 0,665
P
VAP
MPA (80°C) 2,44 2,63
GWP (100 ITH) 4 1410
Toxicity Lo Lo
Flammability Slight None
Table 1.2 – Comparative table of the properties of the t o refrigerants
Image 1.1 – Comparative graph of the pressure-temperature
characteristic of the t o refrigerants
Image 1.2 – Diagram sho ing the combustion levels of the
different types of refrigerant

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1.4 The TEXA solution: onfort series 700R
In order to face up to the advent of the ne refrigerant R1234yf, TEXA
has developed a ne line of innovative air-conditioning recharging units:
onfort series 700R.
All the Konfort series 700R units can be purchased right no for orking
either ith R134a gas or ith the ne R1234yf refrigerant (the only
exception is given by Konfort 780R BiGas, top of the line, hich is able to
ork simultaneously ith both types of refrigerant). The unit must be
initialized to ork ith one of the t o refrigerants by means of the Gas
Kit, hich has to be ordered together ith the equipment.
If a user ishes to opt initially for the R134a refrigerant, he can, in any
case, decide at any time to convert his Konfort unit to the use of the ne
refrigerant R1234yf by purchasing the appropriate Retrofit Kit R134a -
R1234yf (available as optional).
The TEXA offer is no completed ith t o entry level models hich are
dedicated exclusively to the R134a refrigerant, that is Konfort 705R and
Konfort 710R.
The follo ing table summarizes the technical features of all the models
of the ne Konfort 700R series:
Image 1.3 – The complete onfort series 700R ne line
Description 705R 710R 720R 760R 760R Bus 780R
R134a
Compatibility
•
•
•
•
•
•
R1234yf
Compatibility
x x
•
•
•
•
Double refrigerant
management
x x x x x
•
Rotating upper head
system (*)
x x
•
•
•
•
Totally automatic
recycling
x x x
•
•
•
Table 1.3 – Technical features of the various models of Konfort series 700R units
((*) – Feature not available for the German market)

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Description 705R 710R 720R 760R 760R Bus 780R
Automatic hold test
approach
•
•
•
•
•
•
TL System (scale
locking system) (**)
x x x
•
•
•
Internal cleaning
system for the
refrigerant change
x x x x x
•
Advanced database
•
•
•
•
•
•
Vacuum pump 100
lt./min
100
lt./min
100
lt./min
100
lt./min
146 lt./min 100 lt./min
Compressor Hermetic
12cc
Hermetic
12cc
Hermetic
12cc
Hermetic
12cc
Hermetic
21cc
Hermetic
12cc
Tank capability 10Kg 10Kg 12Kg 20Kg 30Kg 2 x 12Kg
Display LCD Blue
80 char.
LCD Blue
80 char.
LCD Blue
80 char.
TFT
320x240
65000
col.
TFT 320x240
65000 col.
TFT 320x240
65000 col.
Maximum orking
pressure
20bars 20bars 20bars 20bars 20bars 20bars
Olio and UV electronic
scales resolution
- - -
1gr 1gr 1gr
Refrigerant electronic
scale resolution 5gr 5gr 5gr 5gr 5gr 5gr
SD card size 2GB 2GB 2GB 2GB 2GB 2GB
Table 1.3 (Continue) – Technical features of the various models of Konfort series 700R
units ((**) – Device orderable as optional)

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CHAPTER 2 – GENERAL WOR ING PRINCIPLE
2.1 Introduction
From a general point of vie , the complete operating cycle of any Konfort
A/C recharging unit consists in five basic steps:
Refrigerant recovery and used oil drain;
Vacuum creation;
Oil/UV injection;
Refrigerant injection;
Recovery of the residual refrigerant from the hydraulic circuit of the
equipment.
This operating cycle is schematized by the follo ing flo chart:
Image 2.1 – Simplified block diagram of the complete operating cycle
of a Konfort equipment
Once the initial setup of the equipment ill be completed, the compressor
starts to recovery the refrigerant from the system. When the pressure
measured by the main sensor decreases under a threshold of -150mBars
relative (850mBars absolute), the compressor stops and the equipment
performs a check of the reached pressure: if the pressure remains belo
the threshold of 600mBars relative (1600mBars absolute), the unit
proceeds ith the next step, other ise it restarts the compressor for a
further recovery. This architecture allo s the equipment to recover all

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the refrigerant into the system, including those refrigerant pockets that
might remain stored, for example, on points distant from the HP and LP
connectors.
Then, a oil drain phase is follo ing, in hich oil and impurities picked up
from the vehicle’s A/C system together ith the refrigerant during the
recovery phase are discharged into the proper bottle.
At this point, the unit passes to the vacuum phase, during hich it
activates the vacuum pump in order to create the vacuum necessary for
the success of the service. During this phase, the pressure measured by
the main sensor and sho n on the display is an absolute pressure, hich
decreases under the value of the room pressure, up to settling to the
value P=1 (thus indicating the achievement of the vacuum state).
Conversely, the pressure measured by gauges is al ays a relative
pressure, namely it is related to the room pressure, hich means that the
value 0 of the gauges actually corresponds ith the room pressure (≈
1000mBars), therefore under vacuum conditions gauges cannot drop
belo zero (full scale).
After the evacuation of the system from the air and residual moisture,
the equipment performs a leak test to assess the quality of the reached
depression: if the reading of the pressure sensor is belo the absolute
value 120mBars, the equipment passes to the next step. Other ise, the
unit stops and advises the operator about the fault by means of a beep
and of a message on the display. It ill be demanded to the operator's
discretion to choose hether to block the service or to s itch to the next
step any ay.
The next step consists in the oil and UV injection. It occurs
automatically in any case: in case of Konfort 705R, 710R and 720R, the
opening of the corresponding electro-valves is automatically timed by the
equipment according to the amount of fluid set to be injected at the
beginning of the service; on the other hand, for Konfort 760R, 760R Bus
and 780R BiGas units, the opening of the electro-valves is controlled ith
a high degree of accuracy depending on the eight decrease measure
coming from the electronic scales.
At the end of each injection, the Konfort unit performs some controls on
the depression state of the system: if the value is not sufficient to
complete the next phase, the cycle is blocked. On the other hand, if the
depression conditions are maintained, the equipment proceeds ith the
next phase, that is the injection of the desired amount of refrigerant.
Before ending the cycle, the unit performs a final recovery ith the HP
and LP fittings disconnected from the vehicle’s A/C system: this allo s
the equipment to recover the residual refrigerant from the service pipes.

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2.2 Detailed description of the single phases
We ould like no to provide a more detailed description of each
operating phase of the equipment. For each phase, the hydraulic
components that are activated and the part of the hydraulic circuit
involved ill be sho n. The flo diagram of a Konfort 760R ill be taken
as reference. From this diagram, the main components of the equipment
(recovery group, compressor, vacuum pump, pressure sensor, electro-
valves, condenser, refrigerant bottle) can be easily identified.
2.2.1 Refrigerant Recovery
During this phase, the equipment activates the follo ing electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVREC electro-valve;
Compressor CO;
Condenser fan (2);
Refrigerant load cell (3).
During this phase, the equipment carries out the refrigerant recovery
from the A/C system of the vehicle. The recovered refrigerant does not
end directly into the internal bottle, but it is firstly cleaned from any solid
impurities and moisture, by submitting it to an appropriate filtering.
More specifically, the refrigerant, thanks to the opening of the four HP
and LP electro-valves (only on Konfort 760R, 760R Bus and 780R BiGas
units, in the K705R, K710R and K720R the LP and HP branches have to be
manually opened by means of the HP and LP valves located on the side of
the unit) and of the EVREC electro-valves, is converged into the recovery
hydraulic circuit of the equipment. By entering in the filtering body, the
refrigerant firstly encounters a mechanic filter (4), hich aims is that of
blocking any large solid impurity mixed ith it.
Then, the fluid passes through an expansion valve (5), hose function
is that of raising the temperature to values close to 0°C. Under these
thermal conditions, the fluid enters the inner chamber of the follo ing
separator filter (6): there the refrigerant ( hich, at this temperature, is
in the gas phase and is remaining suspended into the chamber) can be
separated from the oil hich has been recovered from the A/C system
( hich is in the liquid phase and, therefore, tends to settle in the bottom
of the separator filter).
The refrigerant, no completely in the gaseous phase, passes through a
dryer filter DF, here it is purified from any residual moisture.

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The refrigerant emerging from the dryer filter is then brought into the
compressor (CO), hich compresses it thereby raising its pressure (and,
therefore, its temperature).
Once coming out from the compressor, the fluid passes through a second
separator filter (7), hose function is that of separating the
compressed refrigerant from the oil taken from the equipment’s
compressor ( hich is then poured into the compressor itself).
The refrigerant (at high temperature) is then injected into the external
chamber of the main separator filter here, thanks to the heat exchange
ith the inner chamber ( here T≈0°C), it begins to cool and to condense
into a liquid phase.
The cooling and condensation of the refrigerant are then completed in the
next condenser (2), hich allo s the transit of the refrigerant to the
liquid phase.
The fluid, no completely in the liquid state, is then pumped into the
bottle of the equipment.
Image 2.2 – Part of the hydraulic circuit involved into the refrigerant recovery phase

Konfort Series 700R Service Manual TEXA Technical Assistance
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2.2.2 Oil Drain
During this phase, the equipment activates the follo ing electrical
components:
EVSO electro-valve;
Load cell (8)
1
.
After the recovery phase, the equipment opens the exhaust oil EVSO
electro-valve for the time necessary to empty the bottom of the separator
filter from the oil and the impurities collected during the recovery phase
from the A/C system of the vehicle. The discharge is helped by the
residual pressure inside the equipment.
Image 2.3 – Part of the hydraulic circuit involved into the oil drain phase
2.2.3 Vacuum
During this phase, the equipment activates the follo ing electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVP01 and EVP02 electro-valves;
Vacuum pump PO;
Heating band.
Component available only on 760R, 760R Bus and 780R BiGas models

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Copyright © 20 4 – TEXA S.p.A.
Before the starting of the real vacuum phase, the pressure sensor checks
the residual pressure inside the system: if the pressure does not remain
belo the relative value of 600mbar, a further recovery phase is started,
in order to remove any presence of residual refrigerant from the A/C
system.
If, on the other hand, the pressure is lo er than the above mentioned
value, the t o EVP01 and EVP02 electro-valves are opening and the
vacuum pump s itches on. In this ay, the equipment evacuates the
system from any residual air and moisture. The duration of the vacuum
phase is selected during the initial setting of the A/C service from the
menu of the equipment.
If, ithin 1/3 of the vacuum time initially set, the pressure does not
reach a value hich is belo the threshold of 120mBars absolute, the
equipment alerts the operator about the fault (by means of a beep and of
a arning message on the display), but the vacuum pump ill continue to
operate. The user can decide hether to stop the cycle, by pressing the
STOP button (this anomaly, in fact, could be indicative of a possible leak
of the vehicle’s A/C system) or to continue the service.
Image 2.4 – Part of the hydraulic circuit involved into the vacuum phase

Konfort Series 700R Service Manual TEXA Technical Assistance
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Copyright © 20 4 – TEXA S.p.A.
2.2.4 Leak Test
During this phase, the equipment activates only the pressure sensor (1).
Spent the amount of time set for the vacuum phase, the vacuum pump
turns off and the t o electro-valves EVP01 and EVP02 close. At this
point, the pressure sensor performs a further control of pressure inside
the A/C system (for an amount of time preventively selected from the
initial menu of the equipment).
If, ithin this laps of time, the pressure rises above the limit value of
120mBars absolute, the unit ill automatically stop the cycle, by putting
itself into a stand-by state and by alerting the operator (by means of a
beep and of a special message on the display) about the anomaly
(indicative, in this case, of a possible leak on the A/C system of the
vehicle). If, on the other hand, the remaining pressure is belo this
threshold, the operative cycle of the Konfort unit automatically s itches
to the next step.
Image 2.5 – Part of the hydraulic circuit involved into the leak test
2.2.5 Oil Injection
During this phase, the equipment activates the follo ing electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVIO electro-valve;

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Load cell (9)
2
.
The oil injection is mainly performed by opening the EVIO electro-valve
and by pouring, thanks to the pressure difference, the ne oil (PAG or
POE) into the A/C system of the vehicle. The electro-valve opening is
temporized in Konfort 705R, 710R and 720R units, hile in all the other
models is governed by the decrease of eight detected by the oil
injection load cell. At the end of injection, the equipment ill check the
residual pressure into the system. This ill ensure the possibility of
implementing the next phase.
Image 2.6 – Part of the hydraulic circuit involved into the oil injection
2.2.6 UV Injection
During this phase, the equipment activates the follo ing electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVUV electro-valve;
Load cell (10)
3
.
The UV injection is similar to the oil one, thanks to the opening of the
EVUV electro-valve and of the pour, because of the pressure difference,
of the UV fluid into the A/C system of the vehicle. Once again, the
electro-valve opening is temporized in Konfort 710R and 720R units,
2
Component available only on 760R, 760R Bus and 780R BiGas models
3
Component available only on 760R, 760R Bus and 780R BiGas models

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hile in all the other models is governed by the eight decrease
measured by the corresponding load cell. Even at the end of this phase,
the unit ill check the residual pressure inside the system, in order to
determine if the conditions for the execution of the next step ill exist.
Image 2.7 – Part of the hydraulic circuit involved into the UV injection
2.2.7 Refrigerant Injection
During this phase, the equipment activates the follo ing electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVCA1 electro-valve;
Refrigerant load cell (3).
The refrigerant injection occurs by means of the transfer of the
refrigerant amount, hich has been initially set from the menu of the
unit, from the inner vessel into the A/C system of the vehicle, thanks to
the pressure difference. This transfer is performed simply thanks to the
opening of the EVCA1 electro-valve. The closure of this electro-valve is
managed by the microcontroller board of the unit according to the eight
decrease measured by the load cell located under the equipment’s bottle.