Kovarson ADAX 25 User guide

6322893 - 02/2015 - R0
Code
INSTALLATION AND SERVICING INSTRUCTIONS
ADAX
Condensing wall mounted boiler
EN

2
SAFETY WARNINGS AND REGULATIONS
m
WARNINGS
– After having removed the packaging make sure that
the product supplied is integral and complete in all
its parts. If this is not the case, please contact the
Dealer who sold the appliance.
– The appliance must be used as intended by
KOVARSON who is not responsible for any damage
caused to persons, animals or things, improper
installation, adjustment, maintenance and improper
use of the appliance.
– In the event of water leaks, disconnect the appliance
from the mains power supply, close the water
mains and promptly inform professionally qualified
personnel.
– Periodically check that the operating pressure of
the water heating system when cold is
1-1.2 bar . If
this is not the case, increase the pressure or contact
professionally qualified personnel.
– If the appliance is not used for a long period of time,
at least one of the following operations must be
carried out:
-
set the main system switch to "OFF";
- close the gas and water valves for the water
heating system.
– In order to ensure optimal appliance operations
KOVARSON recommends that maintenance and
checks are carried out
ONCE A YEAR .
m
WARNINGS
– It is recommended that all operators read this manual
carefully in order to use the appliance in a safe and
rational manner.
–
This manual is an integral part of the appliance. It
must therefore be kept for future reference and
must always accompany the appliance in the event
the appliance is transferred or sold to another
Owner or User or is installed on another system.
–
Installation and maintenance of this appliance
must be carried out by a qualified company or by
a professionally qualified technician in accordance
with the instructions contained in the manual. The
company or technician will, at the end of installation
operations, issue a statement of compliance
with national and local Technical Standards and
Legislation in force
RESTRICTIONS
d
IT IS FORBIDDEN
– The appliance is not to be used by children or
unassisted disabled persons.
– Do not use electrical devices or appliances such as
switches, electrical appliances etc if you can smell
fuel. If this should happen:
-
open the doors and windows to air the room;
- close the gas isolation device;
- promptly call for professional assistance.
– Do not touch the appliance with bare feet or with any
wet part of the body.
– Do not carry out any technical intervention or
cleaning operation before having disconnected the
appliance from the mains power by setting the main
switch to "OFF", and closing the gas supply.
– Do not modify the safety or adjustment devices
without authorization and instructions from the
manufacturer.
– Do not block the condensate drain (if present).
– Do not pull, detach or twist the electrical cables
coming out of the appliance even if the appliance is
disconnected from the mains power supply.
– Do not expose the boiler to atmospheric agents.
These boilers can also be installed in partially
covered areas, as per EN 15502, with a maximum
ambient temperature of 60°C and a minimum
ambient temperature of - 5°C. It is recommended
that the boiler is installed below weathered roofs,
on the balcony or in a protected niche, to protect it
from exposure to weathering agents (rain, hail and
snow). The boiler is equipped as standard with an
antifreeze function.
– Do not block or reduce the size of the ventilation
openings of the room where the appliance is
installed, if present.
– Remove the mains power and gas supply from the
appliance if the external temperature could fall
below ZERO (risk of freezing).
– Do not leave containers with flammable substances
in the room where the appliance is installed.
– Do not leave packaging material around since it
could be dangerous. Therefore dispose of it as
prescribed by legislation in force.

3
RANGE
MODEL CODE
ADAX 20 - (G20) 8114280
ADAX 25 - (G20) 8114282
ADAX 30 - (G20) 8114284
ADAX 35 - (G20) 8114286
CONFORMITY
ADAX boilers comply with:
– Directive 2009/142/EC - Gas Appliances
– Boiler Efficiency Directive 92/42/EEC
– Low Voltage Directive 2006/95/EC
– Electromagnetic Compatibility Directive 2004/108/EC
– Thermal Efficiency
– Classified as "Condensing"
– Class NOx 5 (< 70 mg/kWh)
1312
Please refer to the technical data plate for the serial number
and year of manufacture.
EC DECLARATION OF CONFORMITY
In accordance with "Gas Appliances" Directive 2009/142/EC,
"Electromagnetic Compatibility" Directive 2004/108/EC, "Boiler
Efficiency" Directive 92/42/EC and "Low Voltage" Directive
2006/95/EC, the manufacturer KOVARSON s.r.o., via Garbo 27,
37045 Legnago (VR),
DECLARES THAT the boiler models ADAX
comply with the European Directives.
The Technical Manager
(Franco Macchi)
SYMBOLS
a
DANGER
To indicate actions which, if not carried out correctly,
can result in injury of a general nature or may damage
or cause the appliance to malfunction; these actions
therefore require particular caution and adequate
preparation.
f
DANGER
To indicate actions which, if not carried out correctly,
could lead to injury of an electrical nature; these
actions therefore require particular caution and
adequate preparation.
d
IT IS FORBIDDEN
To indicate actions which MUST NOT BE carried out.
m
CAUTION
To indicate particularly important and useful
information.
CONTENTS
1 DESCRIPTION OF THE APPLIANCE 4
1.1 Characteristics .................................4
1.2 Check and safety devices .........................4
1.3 Identification ...................................4
1.3.1 Data label ............................ 5
1.4 Structure ......................................6
1.5 Technical features ...............................7
1.6 Main water circuit ...............................8
1.7 Sensors........................................8
1.8 Expansion tank .................................9
1.9 Circulation pump ................................9
1.9.1 Pump equipped with LED................ 9
1.10 Control panel ..................................10
1.11 Wiring diagram ................................11
2 INSTALLATION 12
2.1 Unpacking the product ..........................12
2.2 Dimensions and weight..........................12
2.3 Handling......................................12
2.4 Installation room ...............................12
2.5 New installation or installation of a replacement
appliance .....................................13
2.6 Cleaning the system ............................13
2.7 Water system treatment .........................13
2.8 Boiler installation ..............................13
2.9 Hydraulic connections...........................14
2.9.1 Plumbing accessories (optional) ......... 14
2.10 Condensate outlet/collection .....................14
2.11 Gas supply ....................................14
2.12 Smoke outlet and combustion air inlet .............15
2.12.1 Coaxial duct (Ø 60/100mm and Ø 80/125mm)16
2.12.2 Separate ducts (Ø 60mm and Ø 80mm) ... 16
2.13 Electrical connections...........................17
2.13.1 Outdoor sensor ....................... 19
2.13.2 Chrono-thermostat or Air Thermostat .... 19
2.13.3 EXAMPLE of use of the command/control
device on some types of heating systems.. 19
2.14 Refilling or emptying............................20
2.14.1 REFILL operations .................... 20
2.14.2 EMPTYING operations ................. 20
3 PUTTING INTO SERVICE 21
3.1 Preliminary operations ..........................21
3.2 Before commissioning ..........................21
3.2.1 Self-calibrating procedure .............. 21
3.3 Parameter setting and display....................22
3.4 List of parameters..............................22
3.5 Fault / malfunction codes........................23
3.6 Display of operating data and counters.............24
3.7 Checks .......................................25
3.7.1 Chimney sweep function ............... 25
3.8 Domestic hot water comfort function (preheating) ...26
3.9 Gas conversion.................................26
4 MAINTENANCE 27
4.1 Adjustments...................................27
4.2 External cleaning...............................27
4.2.1 Cleaning the cladding.................. 27
4.3 Cleaning the inside of the appliance ...............27
4.3.1 Removing components................. 27
4.3.2 Cleaning the burner and the combustion
chamber ............................ 28
4.3.3 Checking the ignition/detection electrode . 28
4.3.4 Final operations ...................... 28
4.4 Checks .......................................28
4.4.1 Checking the smoke duct............... 28
4.4.2 Checking the expansion vessel pressure .. 28
4.5 Unscheduled maintenance .......................29
4.6 Troubleshooting................................29
4.7 Any pump faults and possible solutions ............30

4
1 DESCRIPTION OF THE APPLIANCE
1.1 Characteristics
ADAX are last generation condensing wall mounted boilers
which
KOVARSON has produced for heating and domestic hot
water production. The main design choices made by
KOVARSON
for the
ADAX boilers are:
– the total pre-mix microflame burner combined with a steel
heat exchanger for heating and a rapid heat exchanger for
DHW
– the sealed combustion chamber which can be classified
"Type C" or "Type B" in relation to the room where the boiler
is installed, depending on the smoke outlet configuration
adopted during installation
– the command and control microprocessor electronic board
provides efficient management of both heating and hot water
production. It can also be connected to a remote control
with an Open Therm protocol or to room thermostat and/or
external sensor. If connected to an external sensor, the boiler
temperature varies on the basis of the external temperature
according to a selected optimal climatic curve providing
significant energy and economic savings.
Other special features of the
ADAX boilers are:
– the anti-freeze function which activates automatically if the
temperature of the water inside the boiler falls below the
threshold of the value set at parameter "PAR 10" and , if there
is an external sensor, if the external temperature falls below
the threshold of the value set at parameter "PAR 11"
– the anti-blocking function of the pump and diverter valve. This
activates automatically every 24 hours if no request for heat
has been made
– the chimney sweep function lasts 15 minutes and makes the
job of the qualified technician easier when measuring the
parameters and combustion efficiency
– domestic hot water comfort function which allows the time
necessary for the hot water to become available to be reduced
and ensures that the temperature is stable
– screen display of the operating and self-diagnostic
parameters with error code display when the fault occurs.
This makes repair interventions easier and allows appliance
operation to be restored correctly.
1.2 Check and safety devices
The ADAX boilers are equipped with the following check and
safety devices:
– thermal safety thermostat 100°C
– 3 bar relief valve
– heating water pressure transducer
– delivery sensor
– DHW sensor
– smoke probe.
d
IT IS FORBIDDEN
to commission the appliance with safety devices which
do not work or which have been tampered with.
a
DANGER
Safety device may only be replaced by professional
qualified personnel using
KOVARSON original spare
parts.
1.3 Identification
The ADAX boilers can be identified by means of:
1 Packaging label: this is located on the outside of the
packaging and provides a code, the serial number of the
boiler and the bar code
2 Energy Efficiency Label: this is positioned on the outside
of the packaging to notify the User of the level of energy
savings and reduced environmental pollution produced by
the appliance
3 Data plate: this is located inside the front panel of the
boiler and provides the technical specification, appliance
performance and any other information required by law.
1
3
1
I II
A
B
C
D
E
F
G
2015 811/2013
Cod. 6244745
dB
kW
A++
A+
A
B
C
D
E
F
G
2
3
2
Fig. 1
KEY:
1 Packaging label
2 Energy Efficiency Label
3 Data plate

5
1.3.1 Data label
REFERENCE DIRECTIVE
CODE
APPLIANCE TYPE
MAX OPERATING TEMPERATURE
MIN USEFUL INPUT (50-30°C)
MAX D.H.W. TEMPERATURE
MIN HEAT INPUT
MIN USEFUL OUTPUT (80-60°C)
APPLIANCE CLASSIFICATION
TYPE OF GAS
SUPPLY PRESSURE
MIN HEAT INPUT
NOx CLASS
GAS COUNCIL NUMBER CODE (UK)
WRAS CERTIFICATION (UK)
ELECTRICAL PROTECTION DEGREE
PIN NO.
YEAR OF MANUFACTURE
SERIAL NUMBER
NAME
MAX USEFUL OUTPUT (50-30°C)
MAX OPERATING PRESSURE
MAX USEFUL OUTPUT (80-60°C)
MAX HEAT INPUT
WATER CONTENT IN BOILER
FLOW RATE
MAX OPERATING PRESSURE
ELECTRICAL SUPPLY
MAXIMUM ABSORBED POWER
MAX HEAT INPUT
COUNTRY OF INTENDED
INSTALLTION
APPLIANCE CATEGORY
D.H.W. CONTENT
Fig. 2
m
CAUTION
Tampering with, removing or failing to display the identification plate or carrying out any other operation which does not
allow safe identification of the product or which may hinder installation and maintenance operations.

6
1.4 Structure
23
24
25
26
27
28
15 16 17
18 20
21
22
19
1
2
3
4
5
6
8
11
12
13
14
9
10
2930
7
1 Heat exchanger bleed point
2 Heat exchanger
3 Combustion chamber door
4 Oversleeve
5 Flame inspection window
6 Ignition/detection electrode
7 Return probe
8 Heat safety thermostat
9 Flow probe
10 Fan
11 Condensate siphon
12 Diverter valve
13 System filling unit
14 Domestic hot water sensor
15 Control panel
16 Domestic hot water heat exchanger
17 Gas valve
18 Domestic hot water filter
19 System safety valve
20 Boiler drain
21 System pump
22 Water pressure transducer
23 Automatic vent valve
24 Air-gas mixer
25 Expansion vessel
26 Air inlet pipe
27 Air-smoke chamber
28 Exhaust flue probe
29 Air inlet
30 Smoke outlet
Fig. 3

7
1.5 Technical features
DESCRIPTION
ADAX
20 25 30 35
CERTIFICATIONS
Country of intended installation IT – ES – PT – GR – SI
Fuel G20 / G31
PIN number 1312CP5936
Category II2H3P
Appliance classification B23P - B33P - B53P - C13 - C33 - C43 - C53 - C63 - C83
NO
x class 5 (< 70 mg/kWh)
HEATING PERFORMANCE
HEAT INPUT (*)
Nominal flow (Q
n max) kW 20 24 30 35
Minimum flow (Q
nw min) kW 44,8 6 7
HEAT OUTPUT
Nominal (80-60°C) (P
n max) kW 19,7 23,6 29,5 34,5
Nominal (50-30°C) (P
n max) kW 21,4 25,7 32,2 37,5
Minimum G20 (80-60°C) (P
n min) kW 3,9 4,7 5,9 6,9
Minimum G20 (50-30°C) (P
n min) kW 4,3 5,1 6,5 7,5
Minimum G31 (80-60°C) (P
n min) kW 3,9 4,7 5,9 6,9
Minimum G31 (50-30°C) (P
n min) kW 4,3 5,1 6,5 7,5
EFFICIENCY
Max useful efficiency (80-60°C) %98,5 98,3 98,3 98,6
Min useful efficiency (80-60°C) %97,5 97,9 98,3 98,6
Max useful efficiency (50-30°C) %107 107,1 107,3 107,1
Min useful efficiency (50-30°C) %107,5 106,3 108,3 107,1
Useful efficiency at 30% of load (40-30°C) %107,0 107,0 107,0 107,0
Thermal efficiency (EEC 92/42)
Losses after shutdown at 50°C W84 88 88 92
DOMESTIC HOT WATER PERFORMANCE
Nominal heat input (Q
nw max) kW 24 28 34,8 40
Minimum heat input (Q
nw min) kW 44,8 6 7
Specific D.H.W. flow rate ∆t 30°C (EN 13203) l/min 11,2 12,9 16,5 19,4
Continuous D.H.W. flow rate (∆t 25°C / ∆t 35°C) l/min 13,6 / 9,7 16,1 / 11,5 20 / 14,3 22,9 / 16,4
Minimum D.H.W. flow rate l/min 2222
Max (PMW) / Min Pressure bar 7 / 0,5 7 / 0,5 7 / 0,5 7 / 0,7
kpa 700 / 50 700 / 50 700 / 50 700 / 70
ENERGY PERFORMANCE
HEATING
Heating seasonal energy efficiency class AAAA
Heating seasonal energy efficiency %90 90 90 91
Sound power db(A) 59 61 58 60
DOMESTIC HOT WATER
Domestic hot water energy efficiency class A A A B
Domestic hot water energy efficiency %81 80 80 81
Stated domestic hot water profile load XL XL XL XXL
ELECTRICAL SPECIFICATIONS
Power supply voltage V230
Frequency Hz 50
Absorbed electrical power (Q
n max) W70 85 92 111
Absorbed electrical power at (Q
n min) W52 52 57 58
Absorbed electrical power in stand-by W3,6 3,6 3,6 3,6
Electric degree of protection IP X5D
COMBUSTION DATA
Smoke temperature at Max/Min flow (80-60°C) °C 82 / 66 89 / 71 77 / 67 75 / 62
Smoke temperature at Max/Min flow (50-30°C) °C 59 / 45 71 / 51 58 / 49 54 / 39
Maximum smoke flow Min/Max g/s 11,2 / 1,9 13,1 / 2,2 16,3 / 2,8 18,6 / 3,3
CO
2 at Max/Min flow rate (G20) %9,0 / 9,0 9,0 / 9,0 9,0 / 9,0 9,0 / 9,0
CO
2 at Max/Min flow rate (G31) %10,0 /10,0 10,0 /10,0 10,0 / 10,0 10,0 / 10,0
NOx measured mg/kWh 39 41 37 65
NOZZLES  GAS
Number of nozzles n° 1111

8
DESCRIPTION
ADAX
20 25 30 35
Nozzle diameter (G20-G31) mm 5,3 5,3 5,3 5,3
Gas consumption at Max/Min flow rate (G20) m
3
/h 2,53 / 0,42 2,96 / 0,50 3,70 / 0,63 4,23 / 0,74
Gas consumption at Max/Min flow rate (G31) Kg/h 1,86 / 0,31 2,17 / 0,37 2,71 / 0,46 3,10 / 0,74
Gas supply pressure (G20/G31) mbar 20 / 37 20 / 37 20 / 37 20 / 37
kpa 2 / 3,7 2 / 3,7 2 / 3,7 2 / 3,7
TEMPERATURE  PRESSURE
Max operating temperature (T max) °C 85
Heating adjustment range °C 20÷80
Domestic hot water adjustment range °C 10÷60
Max operating pressure (PMS) bar 3
kpa 300
Water content in boiler l4,65 4,75 4,95 5,60
(*) Heat input calculated using the lower heat output (Hi)
Lower Heat Output (Hi)
G20 Hi. 9.45 kW/m
3
(15°C, 1013 mbar) - G31 Hi. 12.87 kW/kg (15°C, 1013 mbar)
1.6 Main water circuit
3
5
6
14
13
15 16
18
19
10
9
8
11
17
21 20
12
7
M U G E RSc S
4
2
1
Fig. 4
KEY:
M System delivery
R System return
U Domestic hot water outlet
E Domesti hot water inlet
S Safety valve outlet
G Gas supply
Sc Condensate outlet
1 Condensing heat exchanger
2 Combustion chamber
3 Fan
4 Return probe
5 Thermal safety thermostat
6 Flow probe
7 Domestic hot water heat exchanger
8 Pressure transducer
9 Automatic vent valve
10 Pump
11 CH expansion vessel
12 Diverter valve
13 Automatic by-pass
14 Domestic hot water sensor
15 Gas valve
16 Domestic hot water flow meter
17 Domestic hot water filter
18 Boiler drain
19 System relief valve
20 System filling cock
21 Condensate drain siphon
1.7 Sensors
The sensors installed have the following characteristics:
– Dual sensor (thermal safety/output) NTC R25°C; 10kΩ β25°-
85°C: 3435
– domestic hot water sensor NTC R25°C; 10kΩ β25°-85°C: 3435
– external sensor NTC R25°C; 10kΩ β25°-85°C: 3435
TR
0°C 1°C 2°C 3°C 4°C 5°C 6°C 7°C 8°C 9°C
Resistance R (Ω)
0°C 27279
17959
12090
8313
5828
4161
3021
2229
1669
1266
973
26135
17245
11634
8016
5630
4026
2928
2164
1622
1232
25044
16563
11199
7731
5440
3897
2839
2101
1577
1199
24004
15912
10781
7458
5258
3773
2753
2040
1534
1168
23014
15289
10382
7196
5082
3653
2669
1982
1491
1137
22069
14694
9999
6944
4913
3538
2589
1925
1451
1108
21168
14126
9633
6702
4751
3426
2512
1870
1411
1079
20309
13582
9281
6470
4595
3319
2437
1817
1373
1051
19489
13062
8945
6247
4444
3216
2365
1766
1336
1024
18706
12565
8622
6033
4300
3116
2296
1717
1300
998
10°C
20°C
30°C
40°C
50°C
60°C
70°C
80°C
90°C
100°C
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.

9
1.8 Expansion tank
The expansion vessel installed on the boilers has the following
characteristics:
Description U/M
ADAX
20 25 30 35
Total capacity l9,0 10,0
Prefilling pressure kPa 100
bar 1,0
Useful capacity l5,0 6,0
Maximum system
content (*) l124 140
(*) Conditions of:
Average maximum temperature of the system 85°C
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the
maximum system content (as indicated in the
table) an additional expansion vessel must be
prearranged.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for each
meter increase.
1.9 Circulation pump
The flow-head performance curve available for the heating
system is shown in the graph below.
RESIDUAL HEAD (mbar)
0
0 800 1000 1200600400200
100
200
300
400
500
600
30
25
35 40
FLOW RATE (l/h)
Fig. 5
m
CAUTION
The appliance is equipped with a by-pass which
ensures water circulation in the boiler when the
thermostatic valves or cocks are used in the system.
1.9.1 Pump equipped with LED
LED
Fig. 6
ADAX 30 and ADAX 35 boilers use the pump equipped with LED
warning lights which indicate:
LED colour Status Trouble-shooting
LED off No electrical power
Green Permanently
on Normal operation
Red/Green Flashing "Transient safety shutdown"
Anomaly in progress
Red Flashing Permanent safety shutdown
For the "Any pump faults and possible solutions" see the
relevant section at the end of the manual.

10
1.10 Control panel
21
Fig. 7
1 FUNCTIONAL BUTTONS
yIf pressed once or more than once for at least 1 second
during normal operation, this button allows the user
to change the boiler operating mode in a cyclical
sequence (Stand-by – Summer – Winter). If the boiler is
experiencing a fault which can be reset, it allows boiler
operation to be unblocked.
rDuring normal operation, pressing the button displays
the domestic hot water set point which can be between
10 and 60°C. In "parameter setting", the user can scroll
through the parameter index (decreasing) by pressing
this button.
tDuring normal operation, pressing the button displays
the heating set point which can be between 20 and
80°C. In "parameter setting", the user can scroll
through the parameter index (increasing) by pressing
this button.
<During normal operation, pressing this button allows
the user to reduce the heating or DHW set point on
the basis of the selection made previously. If there is a
Remote Control (Open Therm), after having selected the
heating button, the user can modify the incline of the
climatic curve (decreasing it) by pressing the button (
- ).
In "parameter setting/display", the user can modify the
parameter setting or value (decreasing) by pressing this
button.
>During normal operation, pressing this button allows
the user to increase the heating or DHW set point on
the basis of the selection made previously. If there is a
Remote Control (Open Therm), after having selected the
heating button, the user can modify the incline of the
climatic curve (increasing it) by pressing the button (
+ ).
In "parameter setting/display", the user can modify the
parameter setting or value (increasing) by pressing this
button.
cProgramming connector cover plug.
NOTE: pressing any one of these buttons for more than 30
seconds generates a fault on the display without preventing
boiler operation. The warning disappears when normal
conditions are restored.
2 DISPLAY
l
“SUMMER” . This symbol appears when the boiler is
operating in "Summer" mode or if only the domestic
hot water mode is enabled via the remote control. If the
symbols land nare flashing, this indicates that the
chimney sweep function is active.
n
“WINTER” . This symbol appears when the boiler is
operating in "Winter" mode or if both the domestic hot
water and heating modes are enabled via the remote
control. With the remote control, if no operating modes
have been enabled both symbols land nwill be off.
d
“RESET REQUIRED” . The message indicates that after
having repaired the fault, normal boiler operation can be
restored by pressing the button y.
r
“DOMESTIC HOT WATER” . This symbol is present during
a DHW request or during the "chimney sweep function"
It flashes during the selection of the domestic hot water
set point.
t
“HEATING” . This symbol lights up during heating
operation or during the "chimney sweep function It
flashes during the selection of the heating set point.
f
“BLOCK” DUE TO NO FLAME .
F
“FLAME PRESENCE” .
v
“POWER LEVEL” . This indicates the power level at which
the boiler is operating.
p
“PARAMETER” . This indicates that the user may be in
parameter setting/display, or "info" or "counter", or in
"activated alarms" (history).
A
“ALARM” . This indicates that a fault has occurred. The
number specifies the cause which generated the alarm.
z
“CHIMNEY SWEEP” . This indicates that the "chimney
sweep function" has been activated.

11
1.11 Wiring diagram
BLACK
BLUE
BROWN
TRA
EV
F
CN11
BLUE BLUE
GREEN GREEN
BLACK BLACK
TA
SE
CR
BLUE
BLUE
BROWN
BROWN
PI
VD
2 3
BLUE
BROWN
230 V - 50 Hz
L
N
CD. 6324920
CN6
CN5
CN3
CN17
CN4 CN1
CN15
CN14
CN13CN12
CN2
RED
GREEN
WHITE
RED RED
RED
RED
SS
V
FLM
SF
TS
TFU
SM
VCC GND IN
BLACK
BLACK
BLUE
RED GREEN BLACK BLUE
BLUE BROWN
BLUE
4 3 2 1
BLUE
BLACK
GREEN
RED
BLUE
BROWN
EAR
SR
BLACK BLACK
TA2
321 4 5 6
RED
ORANGE
GREEN
TPA
5V GND OUT
L Line
N Neutral
F Fuse (3.15AT)
TRA Ignition transformer
PI System pump
V Fan
EAR Ignition / Detection electrode
EV Gas supply solenoid valve
SS Domestic hot water sensor
SM Flow probe
SR Return Probe
TS Safety thermostat
TFU Thermal fuse
SF Exhaust flue probe
FLM Flow meter
VD Diverter valve
TPA Pressure transducer
TA-TA2 Air thermostat
SE External sensor
CR Remote control (instead of air thermostat)
To connect the "Air Thermostat" or, alternatively the "Remote Control", remove the bridge
between terminals 5-6. Fig. 8
m
CAUTION
Users must:
– Use an omnipolar cut-off switch, disconnect switch
in compliance with EN Standards
– Respect the connections L (Live) - N (Neutral)
– Ensure that the special power cable is only replaced
with a cable ordered as a spare part and connected
by professionally qualified personnel
– Connect the earth wire to an effective earthing
system. The manufacturer is not responsible for any
damage caused by failure to earth the appliance or
failure to observe the information provided in the
wiring diagrams.
d
IT IS FORBIDDEN
To use water pipes for earthing the appliance.

12
2 INSTALLATION
2.1 Unpacking the product
ADAX appliances are delivered in a single unit protected by
cardboard packaging.
Fig. 9
The plastic bag found inside the packaging contains the
following:
– Installation, use and maintenance manual
– Paper template for boiler installation
– Certificate of warranty
– Hydraulic test certificate
– System booklet
– Bag with expansion plugs
d
IT IS FORBIDDEN
Do not leave packaging material around or near
children since it could be dangerous. Dispose of it as
prescribed by legislation in force.
2.2 Dimensions and weight
H
LP
Fig. 10
Description
ADAX
20 25 30 35
L (mm) 400
D (mm) 250 250 250 300
H (mm) 700
Weight (kg) 28,5 28,5 30,0 32,5
2.3 Handling
Once the packaging has been removed, the appliance is to
be handled manually, tilting it slightly, lifting it and applying
pressure in the points indicated in the figure.
Fig. 11
d
IT IS FORBIDDEN
DO NOT hold onto the appliance cladding but use the
"solid" parts such as the base and the rear structure.
a
DANGER
Use suitable tools and accident protection when
removing the packaging and when handling the
appliance.
2.4 Installation room
The room where the appliance is to be installed must comply
with the Technical Regulations and Legislation in force. It must
be equipped with suitably sized ventilation openings when the
installation is a "TYPE B" installation.
The minimum temperature of the installation room must NOT
be lower than
-5 °C .
m
CAUTION
Remember to consider the space needed in order to
access the safety/adjustment devices and to carry out
maintenance interventions (see Fig. 12).

13
APPROXIMATE MINIMUM DISTANCES
≥ 50 mm
≥ 300 mm
≥ 900 mm
Fig. 12
2.5 New installation or installation of a
replacement appliance
When ADAX boilers are installed on old systems or systems
requiring updating, it is recommended the installer checks that:
– the connecting flue pipe is suitable for the combustion
temperature of the appliance, calculated and manufactured in
compliance with Standards, that it is as straight as possible,
air tight, isolated, with no obstructions or restriction and
that it has appropriate condensate collection and evacuation
systems
– the electrical system has been manufactured in compliance
with specific Standards and by professionally qualified
personnel
– the fuel delivery line and the tank (LPG) comply fully with
specific Standards
– the expansion vessel ensures total absorption of the fluid
dilation in the system
– the pump flow-head performance is sufficient for the system
characteristics
– the system is clean, free of any sludge, deposits, de aerated
and air tight. For system cleaning, please refer to the relevant
paragraph.
m
CAUTION
The manufacturer declines all liability for any damage
caused by an incorrect implementation of the smoke
outlet.
2.6 Cleaning the system
Before installing the appliance on a newly constructed system or
replacing a heat generator on an existing system, it is important
that the system is thoroughly cleaned to remove sludge, slag,
dirt, residue etc.
Before removing an old heat generator from an existing system,
it is recommended that the user:
– puts a descaling additive into the water system
– allows the system to work with the generator active for a few
days
– drains the dirty water from the system and flushes the system
with clean water once or more than once.
If the old generator has already been removed or is not available,
replace it with a pump to circulate water in the system and then
proceed as described above.
Once cleaning operations have been carried out and before
installing the new appliance, it is recommended that a fluid
is added to the water system to protect it from corrosion and
deposits.
m
CAUTION
For further information on the type of additive and
usage, please contact the appliance manufacturer.
2.7 Water system treatment
When filling and restoring the system it is good practice to use
water with:
– aspect: clear if possible
– pH: 6÷8
– hardness: < 25°f.
If the water characteristics are different from those indicated, it
is recommended that a safety filter is used on the water delivery
pipe to retain impurities, and a chemical treatment system to
protect against possible deposits and corrosion which could
affect boiler operation.
If the systems are only low temperature systems, it is
recommended that a product is used to prevent the development
of bacteria.
In any case, please refer to and comply with Legislation and
specific Technical Standards in force.
2.8 Boiler installation
ADAX boilers leave the factory with a paper template for
installation onto a solid wall.
For installation:
– position the paper template (1) on the wall (2) where the boiler
is to be mounted
– make the holes and insert the expansion plugs (3)
– hook the boiler onto the plugs.
1
2
3
Fig. 13

14
m
CAUTION
– The height of the boiler is to be such that disassembly
and maintenance interventions are facilitated.
2.9 Hydraulic connections
The plumbing connections have the following characteristics
and dimensions.
175
95
65 65 65 65 ==
48
400
M
Sc
Sc
U G E R
Fig. 14
Description
ADAX
20 25 30 35
M - System delivery Ø 3/4" G
R - System return Ø 3/4" G
U - Domestic hot water output Ø 1/2" G
E - Domestic hot water inlet Ø 1/2" G
G - Gas supply Ø 3/4" G
Sc - Condensate outlet Ø 20 mm
2.9.1 Plumbing accessories (optional)
To facilitate plumbing and gas connections to the systems, the
accessories as shown in the table below are available and are to
be ordered separately from the boiler.
DESCRIPTION CODE
Installation plate 8075441
Curve kit 8075418
Curve and valve kit with connections from DIN to
SIME 8075443
Cocks kit 8091806
Valve kit with connections from DIN to SIME 8075442
Wall mount replacement kit for other makers 8093900
Connection protection kit (for models 25-30-35 kW) 8094530
Polyphosphate dosing kit 8101700
Dosing recharge kit 8101710
Solar kit for instant combination boilers 8105101
NOTE: kit instructions are supplied with the accessory itself or
are to be found on the packaging.
2.10 Condensate outlet/collection
In order to collect the condensate, it is recommended that:
– the appliance condensate outlets and the smoke outlet are
ducted
– a neutralising device is prearranged
– the outlet incline is
>3% .
m
CAUTION
– The condensate outlet duct must be airtight,
suitably sized to that of the siphon and must not be
restricted at any point.
– The condensate outlet must be constructed in full
compliance of the National or Local regulations in
force.
– Before commissioning the appliance, fill the siphon
with water.
2.11 Gas supply
ADAX boilers leave the factory prearranged for gas G20 and can
also work with G31 without the need for any type of mechanical
conversion. Simply select parameter
”03” (see “Parameter
setting and display") and set the type of gas to be used.
If changing the type of gas to be used, carry out the entire
appliance
“COMMISSIONING” phase.
Boiler connection to the gas mains must be carried out in full
compliance with installation Standards in force.
Perform the following checks before making the connection:
– check that the boiler is compatible with the type of gas supply
– the pipes are clean
– the gas supply pipe is the same dimension as or greater than
that of the boiler fitting (G3/4") and with a load loss less than
or equal to that contemplated between the gas mains and the
boiler.
a
DANGER
Once installation has been completed, check that
the joints are air tight as indicated in the installation
Standards.
m
CAUTION
It is recommended that the gas line has a suitable
filter.

15
2.12 Smoke outlet and combustion air inlet
ADAX boilers must be equipped with appropriate smoke flue ducts and combustion air inlet ducts. These ducts are considered an
integral part of the boiler and are provided by
KOVARSON as an accessory kit, to be ordered separately from the appliance on the basis
of the type permitted and the system requirements.
Permitted outlets
max 0,5 m
max 0,5 m
B23P
B53P
C33
C53 C43
B33P
C83
C43
C13
C13
C33
B23P-B53P
Combustion air inlet into the atmosphere and smoke
outlet to open air.
B33P
Combustion air inlet into the atmosphere and smoke
outlet into single flue.
NOTE: opening for combustion air (6 cm2 x kW).
C13
Concentric wall smoke outlet The pipes can start from
the boiler but the outlets must be concentric or close
together (no more than 50 cm) to be subject to similar
wind conditions.
C33
Concentric roof smoke outlet The pipes can start from
the boiler but the outlets must be concentric or close
together (no more than 50 cm) to be subject to similar
wind conditions.
C43
Outlet and inlet in shared or separate flue pipes but
subjected to similar wind conditions.
C63
Same type as C42 but with outlet and inlet made from
pipes which are sold and certified separately.
C53
Separate wall or roof inlet and outlet in different
pressure areas.
NOTE: the inlet and outlet must never be positioned on
opposing walls.
C83
Outlet in single or shared flue or with inlet on wall.
P: smoke outlet system designed to operate with
positive pressure.
Fig. 15
m
WARNINGS
– The smoke flue and the connection to the flue pipe must be in compliance with the national and local Standards and
Legislation in force.
– The use of rigid ducts which are resistant to temperature, condensate, mechanical stress and are air-tight is compulsory.
– Outlet ducts which are not isolated are a risk of danger.

16
2.12.1 Coaxial duct (Ø 60/100mm and Ø 80/125mm)
Coaxial accessories
Description
Code
Ø 60/100
mm
Ø 80/125
mm
Coaxial duct kit 8096250 8096253
Extension W. 1000 mm 8096150 8096171
Extension W. 500 mm 8096151 8096170
Vertical extension W. 140 mm with
smoke analysis take-off point 8086950 -
Adapter for Ø 80/125 mm -8093150
Additional 90° curve 8095850 8095870
Additional 45° curve 8095950 8095970
Tile with joint 8091300 8091300
Roof outlet terminal W. 1284 mm 8091205 8091205
Load loss - Equivalent lengths
Model
Leq (linear metres)
Ø 60/100
mm
Ø 80/125
mm
90° curve 1,5 2
45° curve 1 1
Minimum-Maximum Lengths
Model
Duct Length Ø 60/100 Duct Length Ø 80/125
W
Horizontal
(m)
H Vertical
(m)
W
Horizontal
(m)
H Vertical
(m)
Min.
Max. Min. Max. Min. Max. Min. Max.
ADAX 20 - 6 1,3 8 - 12 1,2 15
ADAX 25 - 6 1,3 7 - 10 1,2 13
ADAX 30 - 4 1,3 6 - 10 1,2 13
ADAX 35 - 4 1,3 6 - 10 1,2 13
2.12.2 Separate ducts (Ø 60mm and Ø 80mm)
Constructing outlets for separate ducts indicates the use of the
"air-smoke split pipe system". This is to be ordered separately
from the boiler and when connected to the other accessories,
from those listed in the table below, completes the smoke-
outlet/ combustion air inlet assembly.
Separate accessories
Description
Code
Diameter Ø
60 (mm)
Diameter Ø
80 (mm)
Air-smoke split pipe system (without
take-off point) 8093060 -
Air-smoke split pipe system (with take-
off point) -8093050
90° curve M-F (6 pieces) 8089921 8077450
90° curve M-F (with take-off point) 8089924 -
M-F 80/60 reduction 8089923 -
Extension W. 1000 mm (6 pieces) 8089920 8077351
Extension W. 500 mm (6 pieces) -8077350
Extension W. 135 mm (with take-off
point) -8077304
Wall outlet terminal 8089541 8089501
Internal and external ring nut kit 8091510 8091500
Inlet terminal 8089540 8089500
45° curve M-F (6 pieces) 8089922 8077451
Collector 8091400
Description
Code
Diameter Ø
60 (mm)
Diameter Ø
80 (mm)
Tile with joint 8091300
Roof outlet terminal W. 1390 mm 8091204
Inlet/outlet fitting Ø 80/125 mm -8091210
Split pipe system
1
23
4
Fig. 16
KEY:
1 Split pipe system with take-off point
2 Air inlet
3 Smoke outlet
4 Flue gas analysis socket
m
CAUTION
– The maximum total length of the ducts , obtained by
adding the lengths of the inlet and outlet pipes, is
determined by the load losses of the individual
accessories used and
must not exceed 15 mm H2O .
–
For all boiler versions, the total extension must not in
any case exceed 25 m (inlet) + 25 m (outlet) for ducts
Ø 80 mm. |b|The total extension must not in any case
exceed 6 m (inlet) + 6 m (outlet) for ducts Ø 60mm
for models
ADAX 20 and ADAX 25 , and 4 m (inlet) + 4
m (outlet) for models
ADAX 30 and ADAX 35 , even if
the total load loss is less than the maximum which
can be applied.
Load loss accessory Ø 60 mm
Description Code
Load loss (mm H2O)
ADAX 20 ADAX 25
Inlet Drain Inlet Drain
Air/smoke split
pipe system 8093060 2,5 0,5 2,5 0,5
90° curve MF 8089921 0,4 0,9 0,5 1,1
45° curve MF 8089922 0,35 0,7 0,45 0,9
Horizontal
extension W. 1000
mm 8089920 0,4 0,9 0,5 1,1
Vertical extension
W. 1000 mm 8089920 0,4 0,6 0,5 0,7
Wall outlet
terminal 8089541 _1,2 _1,4
Wall inlet terminal 8089540 0,5 _0,8 _
Roof outlet
terminal (*) 8091204 0,8 0,1 1,1 0,15
(*) The losses of the roof outlet terminal at inlet include the
manifold code 8091400.

17
Load loss accessory Ø 60 mm
Description Code
Load loss (mm H2O)
ADAX 30 ADAX 35
Inlet Drain Inlet Drain
Air/smoke split
pipe system 8093060 2,5 0,5 2,5 0,5
90° curve MF 8089921 0,6 1,4 0,6 1,4
45° curve MF 8089922 0,55 1,2 0,55 1,2
Horizontal
extension W. 1000
mm 8089920 0,6 1,4 0,6 1,4
Vertical extension
W. 1000 mm 8089920 0,6 0,8 0,6 0,8
Wall outlet
terminal 8089541 _1,6 _1,6
Wall inlet terminal 8089540 1,1 _1,1 _
Roof outlet
terminal (*) 8091204 1,5 0,2 1,5 0,2
(*) The losses of the roof outlet terminal at inlet include the
manifold code 8091400.
NOTE: for the boiler to operate correctly it is necessary that a
minimum distance of 0.50 m of the duct is respected with a 90°
inlet curve.
Load loss accessory Ø 80 mm
Description Code
Load loss (mm H2O)
ADAX 20 ADAX 25
Inlet Drain Inlet Drain
90° curve MF 8077450 0,20 0,25 0,25 0,30
45° curve MF 8077451 0,15 0,15 0,20 0,20
Horizontal
extension W. 1000
mm 8077351 0,15 0,15 0,20 0,20
Vertical extension
W. 1000 mm 8077351 0,15 0,15 0,20 0,20
Wall terminal 8089501 0,10 0,25 0,10 0,35
Roof outlet
terminal (*) 8091204 0,80 0,10 1,10 0,15
Load loss accessory Ø 80 mm
Description Code
Load loss (mm H2O)
ADAX 30 ADAX 35
Inlet Drain Inlet Drain
90° curve MF 8077450 0,30 0,4 0,30 0,4
45° curve MF 8077451 0,25 0,25 0,25 0,25
Horizontal
extension W. 1000
mm 8077351 0,25 0,25 0,25 0,25
Vertical extension
W. 1000 mm 8077351 0,25 0,25 0,25 0,25
Wall terminal 8089501 0,15 0,50 0,15 0,50
Roof outlet
terminal (*) 8091204 1,5 0,2 1,5 0,2
(*) The losses of the roof outlet terminal at inlet include the
manifold code 8091400.
NOTE: for the boiler to operate correctly it is necessary that a
minimum distance of 0.50 m of the duct is respected with a 90°
inlet curve.
Example: calculation of the load loss of a ADAX 20 boiler.
Accessories Ø 80
mm Code
Quantity
Load loss (mm H2O)
Inlet Drain Total
Extension W. 1000
mm (horizontal) 8077351 77 x 0,15 -1,05
Extension W. 1000
mm (horizontal) 8077351 7 - 7 x 0,15 1,05
90° curve 8077450 22 x 0,20 -0,40
90° curve 8077450 2 - 2 x 0,25 0,50
Wall terminal 8089501 20,10 0,25 0,35
TOTAL 3,35
(installation permitted since the total of the load loss of the
accessories used is less than
15 mm H2O ).
120
Ø 80
185
185
Ø 80
250
400
169
169
Fig. 17
2.13 Electrical connections
The boiler is equipped with a ready wired power cable which is
to be connected to a 230V~50 Hz network.
If this cable needs to be replaced, an original spare must be
requested from
KOVARSON .
Therefore only the connections of the original components
as shown in the table are needed. These are to be ordered
separately from the boiler.
DESCRIPTION CODE
External sensor kit (ß=3435, NTC 10KOhm at 25°C) 8094101
Power cable (dedicated) 6323875
Remote control HOME (open therm) 8092280
Remote control HOME PLUS (open therm) 8092281
m
CAUTION
The maintenance interventions described must ONLY
be carried out the professionally qualified personnel.

18
a
DANGER
Before carrying out any interventions described:
– set the main system switch to "OFF"
– close the gas valve
– make sure that no hot parts inside the appliance are
touched.
OFF
Fig. 18
To facilitate introduction of the connection wires of the optional
components into the boiler:
– remove the two screws (1), pull the front panel (2) forwards
and release it from the top by lifting it
1
2
Fig. 19
– remove the screws (3) securing the control panel (4)
– move the panel (4) upwards (a) but keeping it in the side
guides (5) to the end of travel
– bring it forwards and down (b) until it is horizontal
3
a
b
5
4
Fig. 20
– insert the connection wires into the cable gland (6) and the
opening (7) on the control panel
6
7
Fig. 21
– bring the control panel (4) to the original position and secure
it with the screws (3) which were removed previously
– connect the component wires to the terminal board (8)
following the indications provided on the data plate (9).
3
4
8
9
SE
TA
6
5
4
3
2
1
Fig. 22
m
CAUTION
The following is mandatory:
– to use an omnipolar cut-off switch, disconnect
switch in compliance with EN Standards
– if the power cable is to be replaced, that ONLY
a special cable is used with a factory produced
re-wired connector, ordered as a spare part and
connected by a professionally qualified person
– to connect the earth wire to an effective earthing
system (*)
– that before any intervention on the boiler, the mains
power is disconnected by setting the main system
switch to "OFF".
(*) The manufacturer is not responsible for any damage caused
by failure to earth the appliance or failure to observe the
information provided in the wiring diagrams.

19
d
IT IS FORBIDDEN
To use water pipes for earthing the appliance.
2.13.1 Outdoor sensor
The boiler is prearranged for connection to an external air
temperature sensor and can operate with a sliding temperature.
This means that the delivery temperature sent to the boiler can
vary on the basis of the external temperature depending on the
climatic curve selected from those shown in the diagram (Fig.
23).
When fitting the sensor on the outside of the building, follow
the instructions provided on the packaging of the product itself.
Climatic curve
CH flow temperature
20 15 10 5 0 -10 -15-5 -20
80
90
70
60
50
40
30
20
°C
°C
K=9 K=6 K=4,5 K=3
K=2,2
K=1,5
K=0,75
Outdoor temperature
Fig. 23
m
CAUTION
If there is an external sensor, in order to select the
optimal climatic curve for the system and therefore
the delivery temperature based on the external
temperature:
– press the button tfor 1 second
– press buttons >or <until the required curve K has
been selected (within the range
K=0.0 - K=9.0 ).
2.13.2 Chrono-thermostat or Air Thermostat
The electrical connection of the chrono-thermostat or air
thermostat has already been described. When fitting the
component in the room where the readings are to be taken,
follow the instructions provided on the packaging of the product
itself.
2.13.3 EXAMPLE of use of the command/control
device on some types of heating systems
KEY
M System delivery
R System return
CR Remote control
SE Outdoor sensor
TA÷TA3 Air thermostat for the zone
VZ1-VZ3 Zone valves
RL1-RL3 Zone relays
P1-P3 Zone pump
SP Hydraulic separator
ONE DIRECT ZONE system , external sensor and air thermostat.
R
M
SE
TA
CR
Fig. 24
MULTI ZONE system - with pump, air thermostat and external
sensor.
TA
SE
TA2 TA3
TA1
P3
RL1
SP
RL2 RL3
P2P1
R
M
Fig. 25
MULTI ZONE system - with zone valve, air thermostat and
external sensor.
TA
TA1
VZ1 VZ2 VZ3
TA2 TA3
SE
R
M
Fig. 26
m
CAUTION
Set the parameter "tS 17 = DELAY SYSTEM PUMP
ACTIVATION to allow the opening of zone valve Vz.

20
2.14 Refilling or emptying
Before carrying out the operations described below, make
sure that the main system switch is set to "ON" in order for the
display to show the pressure level in the system during refilling.
Make sure that the operating mode is set to "Stand-by"; if this is not
the case, press the button yfor at least 1 second until this
mode has been selected.
ON
Fig. 27
2.14.1 REFILL operations
Remove the front panel:
– remove the two screws (1), pull the front panel (2) forwards
and release it from the top by lifting it.
1
2
Fig. 28
Domestic hot water circuit:
– open the isolation valves of the domestic hot water circuit (if
present)
– open one or more than one hot water valve to fill and bleed the
domestic hot water circuit
– once bleeding has been completed, close the hot water valves.
Heating circuit:
– open the isolation and air bleeding valves in the highest points
of the system
– loosen the automatic bleed valve (3)
– open the isolation valves of the heating circuit (if present)
– open the filling valve (4) and fill the heating system until a
pressure of
1-1.2 bar is shown on the display
– close the filling valve (4)
– check that there is no air in the system by bleeding all the
radiators and the circuit on the high points of the system
4
3
Fig. 29
NOTE: to completely remove all air from the system, it is
recommended that this operation is repeated a number of times.
– check the pressure on the display and if necessary top up until
the correct pressure reading appears
– close the automatic bleed valve (3)
– fill the siphon disconnecting it from the pipe or using (by
means of) the smoke take-off point.
Refit the front panel of the boiler hooking it on at the top,
pushing it forwards and securing it with the screw (1) which was
removed previously.
2.14.2 EMPTYING operations
Domestic hot water circuit:
– close the domestic hot water circuit isolation valve
(prearranged in installation)
– open one or more than one hot water valve to fill and bleed the
domestic hot water circuit.
Boiler:
– loosen the automatic bleed valve (3)
– close the heating circuit isolation valves (prearranged in
installation)
– check that the filling valve (4) is closed
– connect a rubber hose to the boiler drain valve (7) and open it
– when it has fully emptied, close the drain valve (7)
– close the automatic bleed valve (3).
4
37
Fig. 30