ACV WaterMaster 25 User guide

A1006482 - 664Y7300 • D
EN
FR
NL
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INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
for the Installer and the User
25 - 35 - 45 - 70 - 85 - 120
WaterMaster

Addendum Royal Decree: A1007432 - ADD0210
Addendum - Declaration of Conformity i.a.w. Royal Decree (BE)
APPLICABILITY :
664Y7300 - Rev C - WaterMaster 25-35-45-70-85-120

Addendum Nox Values: A1007404 - ADD0160
Addendum - NOx
APPLICABILITY :
664Y6900 - Rev E - HeatMaster 25-35-45-70-85-120 TC
664Y7000 - Rev B - HeatMaster 25C
664Y6700 - Rev D - Prestige 24-32 Solo/Excellence
664Y6200 - Rev F - Prestige 42-50-75-100-120 Solo
664Y7300 - Rev C - WaterMaster 25-35-45-70-85-120
NOx (Class 6/ Classe 6 / Klass 6 / Clase 6 / Klasse 6 / Klasa 6 / класс 6)*
Weighted / Pondéré/Gewogen / Ponderado / Pesata / Gewichtet / Średnio /Средневзвеш.
HeatMaster
25 TC mg/kWh
26,3
35 TC mg/kWh
24,6
45 TC mg/kWh
29,5
70 TC mg/kWh
33,2
85 TC mg/kWh
33,1
120 TC mg/kWh
29,3
HeatMaster 25 C mg/kWh
31,1
Prestige
24 Solo/Excellence mg/kWh 30,4
32 Solo/Excellence mg/kWh 35,6
42 Solo mg/kWh 28,8
50 Solo mg/kWh 35,1
75 Solo mg/kWh 43,2
100 Solo mg/kWh 34,2
120 Solo mg/kWh 39,6
* i.a.w. EN15502-1+A1:2015
NOx
Weighted / Pondéré/Gewogen / Ponderado / Pesata / Gewichtet / Średnio /Средневзвеш.
WaterMaster 25 mg/kWh 21,5
35 mg/kWh 26,7
45 mg/kWh 30,2
70 mg/kWh 30,3
85 mg/kWh 27,0
120 mg/kWh 28,9

WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
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TABLE OF CONTENTS
GENERAL RECOMMENDATIONS....................................................................................7
USER’S GUIDE...................................................................................................................8
Meaning of Symbols....................................................................................................................................................................8
Water heater Marking .................................................................................................................................................................9
Control Panel and Display .......................................................................................................................................................10
Stand-by Screen..........................................................................................................................................................................11
Lockout Screen............................................................................................................................................................................11
Status Messages..........................................................................................................................................................................11
What to Check on a Regular Basis ........................................................................................................................................12
In case of Problem......................................................................................................................................................................12
Water heater Setup Guide.......................................................................................................................................................12
APPLIANCE DESCRIPTION............................................................................................17
Models - WaterMaster®25 - 35 - 45 - 70 - 85 - 120 ..........................................................................................................17
WaterMaster® 25 - 35 - 45 overview....................................................................................................................................17
WaterMaster® overview..........................................................................................................................................................18
Connections - at the back........................................................................................................................................................19
TECHNICAL CHARACTERISTICS..................................................................................20
Dimensions .................................................................................................................................................................................. 20
Clearance ...................................................................................................................................................................................... 20
Combustion characteristics....................................................................................................................................................21
gas categories (All models).................................................................................................................................................... 22
General Recommendations for Chimney Connection................................................................................................ 23
Chimney connection characteristics...................................................................................................................................24
Calculation of the ue pipe length..................................................................................................................................... 25
Cascade : calculation of the maximum length of ue pipes..................................................................................... 26
Electrical Characteristics WaterMaster®25-35-45 ........................................................................................................ 30
Electrical Characteristics WaterMaster®70-85 ................................................................................................................32
Electrical Characteristics WaterMaster®120 ................................................................................................................... 34
Hydraulic Characteristics........................................................................................................................................................ 36
DHW performance .................................................................................................................................................................... 36
Maximum Operating Conditions......................................................................................................................................... 36
Recommendations for the prevention of corrosion and scaling in Heating Systems......................................37
G3 Requirements and Guidance - UK Only...................................................................................................................... 38
INSTALLATION ..............................................................................................................40
Safety instructions for the installation ............................................................................................................................. 40
Package contents........................................................................................................................................................................41
Tools Required for the Installation.......................................................................................................................................41
Water heater preparation........................................................................................................................................................41
Recommendations for DHW Connections........................................................................................................................42
Removal and Installation of the Front and Top Panels.................................................................................................43
Conversion to Propane............................................................................................................................................................ 44
STARTING UP .................................................................................................................45
Safety Instructions for Starting Up ..................................................................................................................................... 45
Tools Required for Starting up.............................................................................................................................................. 45
Checks before Starting up...................................................................................................................................................... 45
Filling the system....................................................................................................................................................................... 45
Starting up the Water heater................................................................................................................................................. 46
Checking and Adjusting the Burner................................................................................................................................... 46
MAINTENANCE..............................................................................................................47
Safety instructions for the appliance maintenance......................................................................................................47
Tools Required for Maintenance...........................................................................................................................................47
Water heater shut down for Maintenance ........................................................................................................................47
Periodic Water heater Maintenance Tasks ........................................................................................................................47
Removal and Installation of the Burner ............................................................................................................................ 48
Removal, Check and Installation of the Burner Electrode ......................................................................................... 50
Cleaning the Exchanger.......................................................................................................................................................... 50
Restarting after Maintenance............................................................................................................................................... 50
Torque Values.............................................................................................................................................................................. 50
LOCKING CODES ...........................................................................................................51
PRODUCT FICHE .......................................................................................... APPENDIX 1
DECLARATION OF CONFORMITY ............................................................ APPENDIX 1
DÉCLARATION DE CONFORMITÉ A.R. 17/7/2009 / VERKLARING VAN
OVEREENSTEMMING K.B. 17/7/2009 - KONFORMITÄTSERKLÄRUNG
A.R. 17/7/2009 - BE........................................................................................ APPENDIX 2

NOTE
This manual contains important information with respect to the installation, the starting up and the
maintenance of the appliance.
This manual must be provided to the user, who will read it carefully and keep it in a safe place.
We accept no liability should any damage result from the failure to comply with theinstructions
contained in this technical manual.
Essential recommendations for safety
• It is prohibited to carry out any modifications to the appliance without the
manufacturer’s prior and written agreement.
• The product must be installed by a qualified engineer, in accordance with
applicable local standards and regulations.
• The installation must comply with the instructions contained in this manual and
with the standards and regulations applicable to heating systems.
• Failure to comply with the instructions in this manual could result in personal
injury or a risk of environmental pollution.
• The manufacturer declines all liability for any damage caused as a result of
incorrect installation or in the event of the use of appliances or accessories that are
not specified by the manufacturer.
Essential recommendations for the correct operation of the appliance
• In order to ensure that the appliance operates correctly, it is essential to have it
serviced by a certified installer or maintenance contractor every year.
• In case of anomaly, please call your service engineer.
• Faulty parts may only be replaced by genuine factory parts.
General remarks
• The availability of certain models as well as their accessories may vary according to
markets.
• The manufacturer reserves the right to change the technical characteristics and
features of its products without prior notice. Please check for an updated version
of this manual in the documentation page on the website www.acv.com.
• In spite of the strict quality standards that ACV applies to its appliances during
production, inspection and transport, faults may occur. Please immediately notify
your approved installer of any faults.
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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
GENERAL RECOMMENDATIONS
If you smell gas:
- Immediately isolate the gas supply.
- Open windows and doors to ventilate the area.
- Do not use any electrical appliances and do not operate any switches.
- Immediately notify your gas supplier and/or your installer.
D
ONOT STORE ANY FLAMMABLE OR CORROSIVE PRODUCTS, PAINT,
SOLVENTS, SALTS, CHLORIDE PRODUCTS AND OTHER DETERGENT PRODUCTS
NEAR THE APPLIANCE.
T
HIS APPLIANCE CAN BE USED BY CHILDREN AGED FROM 8 YEARS OLD
AND ABOVE AND PERSONS WITH REDUCED PHYSICAL, SENSORY OR MENTAL
CAPABILITIES OR LACK OF EXPERIENCE AND KNOWLEDGE, IF THEY HAVE
BEEN GIVEN SUPERVISION OR INSTRUCTION CONCERNING THE USE OF THE
APPLIANCE IN ASAFE WAY AND UNDERSTAND THE HAZARDS INVOLVED.
CLEANING AND USER MAINTENANCE SHALL NOT BE PERFORMED BY
CHILDREN WITHOUT SUPERVISION.
CHILDREN SHALL NOT PLAY WITH THE APPLIANCE
.
A
BYPRODUCT OF ANY GAS FIRED APPLIANCE IS CARBON MONOXIDE. ACV
RECOMMENDS THE INSTALLATION OF AMINIMUM OF TWO (2) HARD-WIRED
CARBON MONOXIDE DETECTORS WITH AN ALARM AND BATTERY BACK-UP;
ONE IN THE MECHANICAL ROOM WHERE THE BOILER IS LOCATED AND
ANOTHER INSTALLED IN THE LIVING AREA OUTSIDE THE BEDROOM(S) FOR
ALL INSTALLATIONS.
GENERAL SAFETY INSTRUCTIONS FOR GAS APPLIANCES
General remarks
• The end user is only allowed to carry out the basic set-up operations mentioned in
"Water heater Setup Guide" on page 8, after he has received all relevant instructions
from the installer. Any other set-up must be carried out by an approved installer.
• If the end user misuses the installer code to access installer-specific parameters and
makes changes that cause a system failure, any warranty claim will be void.
• To get additional information on how to use the ACVMax interface, refer to the installer-
specific settings and the detailed error codes, in the Installer's Handbook available at
www.acv.com.

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USER’S GUIDE
MEANING OF SYMBOLS
Symbols on the
packaging Meaning
Fragile
Keep dry
Keep standing, up
Danger of tipping over
Hand truck or pallet truck required for transport
Symbols on the
appliance Meaning
Gas connection
Condensate trap (ball syphon)
Domestic Hot Water circuit
Primary circuit
Expansion vessel
Electricity
Alarm
Symbols in the
manual Meaning
Essential recommendation for safety (of persons and equipment)
Essential recommendation for electrical safety (electrical hazard)
Essential recommendation for the correct operation of the appliance or the
system
General remark
Safety valve connected to the sewage system
Connection to the sewage system

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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
USER’S GUIDE
The part number (Code) and serial number (N°) of the appliance are indicated on its rating
plate and must be provided to ACV in case of warranty claim. Failure to do so will make the
claim void.
WATER HEATER MARKING
Location: Back panel
CODE
ANNO
A1002669
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 25
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002669 (92) 2018
PMS = PMW = 8,6 bar
87 °C
100l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
100l
87 °CT max =
101 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
2525
5
25
5
25
5 5
2525
5
25
5
25
5 5
CODE
ANNO
A1002670
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 35
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002670 (92) 2018
PMS = PMW = 8,6 bar
87 °C
100l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
100l
87 °CT max =
111 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI 2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
3535
7
35
7
35
7 7
3535
7
35
7
35
7 7
CODE
ANNO
A1002671
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 45
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002671 (92) 2018
PMS = PMW = 8,6 bar
87 °C
100l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
100l
87 °CT max =
126 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI 2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
4545
9
45
9
45
9 9
4545
9
45
9
45
9 9
CODE
ANNO
A1002078
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 85
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002078 (92) 2018
PMS = PMW = 8,6 bar
87 °C
190l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
125l
87 °CT max =
266 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
85,985,9
20
85,9
23
85,9
17 20
85,985,9
20
85,9
23
85,9
17 20
CODE
ANNO
A1002077
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 70
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002077 (92) 2018
PMS = PMW = 8,6 bar
87 °C
190l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
125l
87 °CT max =
225 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
69,969,9
20
69,9
23
69,9
17 20
69,969,9
20
69,9
23
69,9
17 20
WaterMaster 25
WaterMaster 45
WaterMaster 35 WaterMaster 70 WaterMaster 85
WaterMaster 120
CODE
ANNO
A1002079
3 bar
MODEL
Type:
CL. NOx
PIN
G31
Qn
Qn min
Pn
WaterMaster 120
B23-B23P-C13(x)-C33(x)-C43(x)-C53(x)-C63(x)-C83(x)-
C93(x)
5
0063CQ3618
G20 G25
2018
Made in BELGIUM
ACV INTERNATIONAL
Oude Vijverweg 6
1653 Dworp
Belgium
[e-mail] (21) 123456 (91) A1002079 (92) 2018
PMS = PMW = 8,6 bar
87 °C
190l
T max =
Pn min
G25.3
kW
kW
kW
kW
kW
Condensatie ketel - Chaudière à condensation - Condensing boiler -
Brennwertkessel - Caldaia a condensazione - Caldera de
condensacion
125l
87 °CT max =
327 W
~ 230 V
50 Hz
PERFORMANCE
BEI2E(S/R) - 20/25 mbar
ATII2H3P - 20/37/50 mbar
CH; SKII2H3P - 20/50 mbar
CZ; ES; GB; GR; HR; IE;
IT; LT; PL; PT
II2H3P - 20/37/50 mbar
DEII2E3P - 20/50 mbar
DEII2ELL3P - 20/50 mbar
FI; RO; SIII2H3P - 20/30 mbar
FR
II2ER3P 20/25/37/50
mbar
LUII2H3P - 20/30 mbar
NL
II2EK3P - 20/25/30/50
mbar *
LVI2H
DKI2H - 20 mbar
Adjusted - Réglé - Afgesteld G20 - 20 mbar
*II2EK (WOBBE(43,46 - 45,3 MJ/m³(0°C))3P
N°: 18/123456
115115
25
115
25
115
25 25
115115
25
115
25
115
25 25

1 5
243
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Target = 85°C
WaterMaster Tap icon: indicates that a DHW call has
been received.
Circulator icons: indicate which circula-
tors are currently powered.
Status line: displays the current operat-
ing state of the water heater. See “Status
Messages” on page 7.
Basic information. The user can
toggle the items using the LEFT
and RIGHT keys and view target,
Supply, Return, Domestic, Out-
door and System temperatures.
The appliance type is indicated at the top of the screen. The type and model
are factory preset.
The appliance is represented in the centre of the Home Screen. Basic operat-
ing information such as supply and return temperatures are displayed as well
as current burner status.
A ame symbol is displayed when the
unit is red. The ame size changes to
indicate the current ring rate.
WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
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USER’S GUIDE
CONTROL PANEL AND DISPLAY
Panel Description
1. Pressure gauge - Indicates the primary circuit pressure (min. 1 bar when cold).
2. ACVMAX LCD Display - It is the setup interface of the water heater and indicates the parameter
values, the error codes and the set-up status of the parameters. It displays a series of screens, each
showing information and/or icons. The main icons are detailed below.
3. Installer button - Allows the installer to access the menus of the ACVMAX controller to set up the
system.
4. Arrow keys and OK key - to browse through the screens of the ACVMAX controller, set up the water
heater, increase and decrease the displayed values and validate the selections and access the Easy
set-up screens. The OK key is also used to RESET the appliance after a locking (follow the instruc-
tions on the screen).
5. ON/OFF master switch of the water heater - To turn the appliance ON and OFF.
Main settings of ACVMAX Display
• Screen backlight - it will illuminate when any button is depressed, and remain illuminated for ve
minutes.
• Screen contrast - it can be adjusted at the Home screen by pressing and holding the OK button, then
pressing and holding the LEFT button along with the OK button. Press the UP and DOWN button
to increase or decrease the contrast while holding the OK and LEFT buttons depressed. All buttons
must be released and the procedure performed again to switch between increasing and decreasing
contrast.
Typical items appearing on the Home screen:
Main Icons of ACVMAX display
DHW - indicates information related to the Domestic Hot Water circuit.
Home - to go back to the main menu screen.
Back - to go back to the previous screen.
Warm weather shutdown - displays on the home screen when the outdoor temperature
reaches the Warm Weather Shutdown preset temperature.
Reset - to reset the system to the factory settings.
Parameters - to access to the setup of controller parameters (language, units, etc.).
Easy setup - Indicates parameters that can be accessed through the EZ setup.
CH/DHW operation - Although this icon is active, the CH function is permanently disabled and
cannot be accessed.
Information - To get information on the water heater.

Low Water
Water level has fallen below an
acceptable operating level.
Increase pressure to normal range.
If problem persists,
call for service
E37
Lockout reference code. Refer to “In case of Prob-
lem...” on page 8 for more information.
Body text. The rst sentence describes the lockout,
the second sentence gives a possible cure, and the
third tells how to reset the lockout.
Lockout message. Refer to “In case of Problem...”
on page 8 for more information.
Stand-by
84°C
61°C
Target = --
WaterMaster
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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
USER’S GUIDE
LOCKOUT SCREEN
If a problem occurs, the Lockout screen replaces the Home screen. The backlight also remains on as long
as the problem is not solved. Pressing any arrow button will return to the Home screen.
Using the code located in the right bottom corner of the screen, troubleshoot the problem, either with
the table located in paragraph “In case of Problem...” on page 8, or with the Lockout code table in the
Installer’s Handbook (for the installer only).
STAND-BY SCREEN
This screen is displayed at start-up. It indicates that the WaterMaster is ready to respond when a demand
is received.
STATUS MESSAGES
Stand-by Indicates that the WaterMaster is ready to respond when a demand is received.
DHW Demand A domestic hot water call has been received.
Manual Operation The burner or circulators have manually been enabled in the Installer Menu.
DHW Burner Delay The burner will not re until the call blocking time has elapsed.
DHW Setpoint Reached The burner is not red because the supply/system water temperature exceeds
the setpoint. The domestic circulator continues to operate and the burner will
re again once the supply/system water temperature drops below the setpoint.
DHW Post Pump The domestic hot water circulator is running to remove heat from the Water-
Master at the completion of a call.
Freeze Protection The burner is red because the freeze protection feature has been activated.
Freeze protection will end once the supply/system water temperature is raised
to16°C.
Boiler Protection The burner ring rate is being reduced because of an excessive dierence be-
tween the appliance supply and return temperatures. The ring rate will begin
increasing once the temperature dierence is less than25°C.
Lockout Description The lockout which currently has the WaterMaster shut down is displayed

* In case of complex systems, the setup must be performed by an approved installer using the Installer’s Handbook.
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Target = 85°C
WaterMaster EZ Setup
Heating EZ Setup
DHW EZ Setup EZ Setup Reset Display EZ Setup
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USER’S GUIDE
WATER HEATER SETUP GUIDE
The main parameters of the WaterMaster water heaters can be set up using the EZ (easy) setup function
of the ACVMax controller. The EZ setup function allows the user/installer to quickly setup the appliance
for immediate operation according to the system conguration*.
General remarks
• To navigate on the screen, use the UP, DOWN, LEFT and RIGHT keys, then the OK key
to validate a selection. A selection is marked by a black background under the selected
icon/text.
• To increase/decrease values, use the UP and DOWN keys or the LEFT and RIGHT keys
according to the situation.
WHAT TO CHECK ON A REGULAR BASIS
Essential recommendations for the correct operation of the appliance
ACV recommends to check the system at least every 6 months as follows:
• Check that the system water pressure is at least 1 bar when cold. If the pressure drops
below 0.7 bar, the built-in pressure sensor blocks the appliance until the pressure
exceeds 1.2 bar.
• If it is required to top up the system to maintain the minimum recommended water
pressure, always turn the appliance off and only add small amounts of water at a time. If
a large amount of cold water is added in a hot appliance, the appliance can be damaged
definitively.
• If the system needs to be refilled repeatedly with water, please contact your installer.
• Check that there is no water on the floor under the appliance. If there is, please call your
installer.
• If a condensate neutralisation system is installed, check it and have it cleaned regularly.
• Check regularly that there is no error message (lockout) on the screen. A typical lockout
screen is explained on the previous page. Refer also to the Troubleshooting table below
or call your installer as required.
IN CASE OF PROBLEM...
Check the list of faults and corresponding codes below to get the solution(s). If no solution is provided here,
please contact your installer who will determine the correct solution by referring to”Locking codes”on page 47.
Fault
code Problem Possible Cause(s) Solution
-
The appliance does
not turn on when
pressing the ON/OFF
Master switch
No power supply
Check the power supply and that
the appliance power plug is con-
nected to the network.
E 01 Failed ignition The burner failed to light af-
ter 5 ignition attempts
Check gas supply to the water heat-
er.
E 13 Reset limit reached Resets are limited to 5 every
15 minutes
Turn unit OFF and ON to resume
normal operation.
E 34 Low voltage
Line voltage has fallen be-
low an acceptable operating
level
The water heater will automatically
reset once line voltage returns to
normal.
E 37 Low Water
Water pressure has fallen
below an acceptable oper-
ating level (0.7 bar)
Rell the system to reach a normal
range pressure. The water heater
will automatically reset once water
pressure returns to normal.
E 94 Internal Display Fault Display memory error Turn appliance o and on to re-
sume normal operation.

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USER’S GUIDE
Heating Easy setup
As the WaterMaster appliance has the sole purpose of producing Domestic Hot Water, the CH circuit is
internal only (primary circuit) and the heating function is therefore disabled (default setting).
It cannot be adjusted through the EZ Setup, even though the menus and functions can be accessed.
Therefore, any change made through the EZ Setup will not be taken into account by the ACVMax and will
have no inuence whatsoever on the appliance performances.
In the Installer menu, the CH function is also deactivated even though the menus are visible. Please refer
to the Installer’s Handbook for more details.

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USER’S GUIDE
DHW Setup
EZ Setup
DHW EZ Setup Select DHW Demand
Thermostat
Sensor
Select DHW Demand
Thermostat
Sensor
Select DHW Demand prompts the installer to select how a DHW Demand is generated. There are two Select DHW Demand options,
among which the installer must make a selection.
When Thermostat is selected in Select DHW Demand, a domestic hot water call from an aquastat or dry contact switch will enable
the WaterMaster with a xed setpoint for a domestic hot water call..
When Sensor is selected in Select DHW Demand, it requires the use of an optional Indirect Water Heater Sensor. The WaterMaster moni-
tors the DHW storage temperature and generates a DHW call whenever the temperature drops below the DHW storage setpoint by 3°C.
Default : Sensor
DHW Boiler Setpoint prompts to enter the xed appliance setpoint temperature during a hot water call when theThermostat option
is selected.
Press on LEFT or RIGHT button to adjust the required temperature setpoint then press OK to store the setting.
Default: 75°C.
DHW Setpoint prompts to enter the DHW storage setpoint temperature.
Press on LEFT or RIGHT button to adjust the required temperature setpoint then press OK to store the setting.
Default: 60°C.
The DHW Storage Setpoint will automatically be set 15°C higher than the DHW Setpoint setting
DHW Priority Timeout prompts to enter an optional time limit that a domestic hot water call has priority.
Press on LEFT or RIGHT button to adjust the required timeout value, if required, then press OK to store the
setting and complete the DHW setting.
Default: O
DHW Priority Timeout
O
O 120 min.
DHW
Boiler Setpoint
75°C
35°C 87°C
DHW Setpoint
60°C
20°C 75°C
EZ Setup Complete
DHW EZ setup is complete.
Additional changes can be made in
the Installer Menu if required.
Press OK to return to EZ Setup Menu

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USER’S GUIDE
Easy Setup Reset
EZ Setup
EZ Setup
EZ Setup Reset EZ Setup Reset
Press OK to restore factory settings,
any other button to keep current
settings.
EZ Setup Reset allows to reset all EZ
setup settings back to the original factory
defaults.
Follow the on-screen instructions to reset
all EZ setup settings.
Display Easy Setup
Display EZ Setup
English
Français
Nederlands
Español
Italiano
Deutsch
Select Unit
Fahrenheit
Celsius
Display EZ Setup allows to select the
interface language (Nine dierent languag-
es: English, French, Dutch, Spanish, Italian,
German, Czech, Polish and Russian).
Press on UP or DOWN button to select the
required language then press OK to store the
setting.
Display EZ Setup allows to select the inter-
face temperature unit.
Press on UP or DOWN button to select the
required unit then press OK to store the set-
ting.
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Target = 85°C
WaterMaster
EZ Setup
Starting from the Home screen :
CH / DHW Operation Boiler Information Select Language
Selecting this icon
and validating the
selection with the
OK key allows to
access directly to the
language selection
page (see on the left)

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USER’S GUIDE
CH / DHW Operation
CH/DHW Operation
Heating Disabled DHW enabled CH/DHW Operation provides a simple way to enable/disable the DHW function of the WaterMaster.
Press on LEFT or RIGHT button to select the object (CH or DHW icon), then press OK to toggle between the ena-
bled/disabled status. The status of the circuit is displayed at the top of the screen. Please note that the CH circuit
cannot be enabled in a WaterMaster appliance.
Using the arrow keys, select the HOME or RETURN icon at the bottom of the screen to go back either to the
home page or to the previous screen respectively.
Default:
DHW enabled
Boiler Information screen provides real time operating information of the WaterMaster. Each line contains an
information item followed by its current value. Six lines are displayed on the screen at one time.
Press on UP or DOWN button to scroll through the items. For more information, refer to the Installer’s Handbook
of the WaterMaster water heaters.
Lockout History records the last eight lockouts. Six lines are displayed on the Lock-
out History screen at one time. Each line contains a lockout description followed
by how long ago the lockout occurred.
Press on UP or DOWN button to scroll through the items and on OK to select any of
them and get more details through the Lockout Details screen. For more informa-
tion, refer to the Installer’s Handbook of the WaterMaster water heaters.
Boiler Information
Boiler Information
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
a
b
c
d
e
f
b
b
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
b
b
Boiler Information
Boiler Status Standby
Heating Call No
DHW Call No
Boiler Firing Rate --
Ionization current μA
Boiler Setpoint --
Lockout History
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
a
b
c
d
e
f
b
b
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
b
b
Lockout History
1. Blower speed 5h ago
2. DHW Sensor Open 2h ago
3. Sensor Drift 25 h ago
4. No error 27 h ago
5. No error 27 h ago
6. No error 27 h ago
Lockout Details
Blower speed
Boiler Status --
Heating Call --
DHW Call --
Boiler Firing Rate 44%
Ionization current 44μA
Boiler Information

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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
APPLIANCE DESCRIPTION
MODELS - WATERMASTER®25 - 35 - 45 - 70 - 85 - 120
The WaterMaster® series is a range of condensing water heaters designed for the exclusive production
of Domestic Hot Water. The water heaters combine ACV's "Tank-in-Tank" concept with a double primary
circuit to reach the high performance of a TOTAL CONDENSATION, double-circuit water heater.
All the WaterMaster® models are equipped with a high eciency charging pump and with an ACV air/
gas premix burner with low NOx emissions. During operation, the burner starts automatically as soon as
the water heater temperature gets lower than the preset temperature and stops as soon as the preset
temperature is reached.
The WaterMaster® series features a built-in frost protection mechanism: as soon as the ow temperature
[NTC1 probe] drops below 7°C, the primary pumps are activated. As soon as the ow temperature is at
5°C, the burner starts up until the ow temperature rises above 15°C. The pumps continue to run for
around 10 minutes. The function can be enabled or disabled through the installer menu. When the frost
protection is disabled, only the pumps operate.
WATERMASTER® 25 - 35 - 45 OVERVIEW
1
2
3
5
4
6
7
10
12
13
14
15
15
16
17
19 21
22
20
18
11
9
8
1. Concentric ue gas/air inlet box
2. Flue gas exhaust tube
3. Combustion chamber
4. Stainless steel heat exchanger
5. Stainless steel “Tank-in-Tank” hot water produc-
tion tank
6. Primary circuit separation disc
7. Indirect water pre-heater
8. Condensate recovery dish + NTC5 sensor (ue gas)
(not shown)
9. Insulation
10. High eciency circulator pump
11. NTC2 sensor (CH return)
12. Pressure sensor
13. Electrical panel (with spare fuses at the back)
14. ACVMax Control panel
15. DHW tank dry well (Dip tube with temperature sen-
sor)
16. Automatic air vent
17. Gas pipe
18. NTC1 sensor (CH supply)
19. Gas valve
20. DHW safety valve / (T & P relief valve - UK only)
21. Modulating air/gas premix burner with fan
22. Air inlet

1
4
2
3
WaterMaster® 70-85 - Top view
WaterMaster® 120 - Top view
15
16
4
18
WATERMASTER® OVERVIEW
1. ACVMax Control panel
2. NTC sensor (primary circuit)
3. High eciency circulator pump
4. Condensate recovery dish
5. Electrical panel (with spare fuses at the back)
6. DHW tank dry well (Dip tube with tempera-
ture sensor)
7. Automatic air vent
8. Gas pressure sensor
9. NTC1 sensor (Primary circuit supply)
10. Gas valve
11. DHW safety valve / (T & P relief valve - UK only)
12. Modulating air/gas premix burner with fan
13. Concentric ue gas/air inlet box
14. Air inlet
15. “Tank-in-Tank” hot water production tank
16. Flue gas exhaust tube
17. Indirect water pre-heater
18. Pressure sensor
17
5
6
7
8
14
9 10 11 13
12
6
7
8
9 10 11 12
14
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APPLIANCE DESCRIPTION

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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
APPLIANCE DESCRIPTION
CONNECTIONS - AT THE BACK
4
9
10
5
6
3
2
7
12
1
8
1. Discharge for built-in DHW safety valve / (T & P re-
lief valve - UK only) outlet to be connected to the
sewage system
2. Gas connection [M]
3. Grommets for electrical wires (low voltage con-
trol)
4. Domestic Hot Water outlet
5. Primary circuit supply connection (not used)
6. Connection for provided primary circuit safety
valve (to be installed).
7. Auxiliary connection loop (not used)
8. Primary circuit ll connection
9. Grommets for electrical wires (230 V)
10. Domestic Hot Water inlet
11. Expansion vessel (25 L) kit (optional accessory- to
be installed)
12. Flue connection
11

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TECHNICAL CHARACTERISTICS
DIMENSIONS
CLEARANCE
Water heater Clearance WaterMaster® 25 - 35 - 45 - 70 - 85 - 120
A(mm) Recommended 400
Minimum 300
B(mm) Recommended 800
Minimum 600
C(mm) Recommended 400
Minimum 250
D(mm) Recommended 600
Minimum 400
Front view View from the top
B C
A
WATERMASTER
D
Water heater Dimensions WM 25 - 35 - 45 WM 70 - 85 WM 120
Amm 1755 2170 2170
Bmm 600 690 690
Cmm 708 753 753
D mm 80 100 100
E mm 125 150 150
F mm 145 155 155
G mm 1670 2080 2080
H mm 110 125 125
J ( ) mm 1717 2126 2126
K ( )mm 1610 2030 2030
L (primary circuit supply - not used) mm 1405 1750 1750
M (aux. circulation loop) mm – 740 740
N (primary circuit supply) mm 446 540 540
O ( )mm 273 311 311
Primary circuit with expansion vessel
kit [F] “1 1.1/2 1.1/2
DHW Connection [M] “ 111
Auxiliary connection [F] “ – 1.1/2 1.1/2
Gas connection [M] “ 3/4 3/4 3/4
min. ∅of ue pipe mm 80 100 100
Drained weight Kg 177 298 299
WA
T
E
RMA
STE
R
A
C
B
D
E
F
G
H
J
K
L
M
N
O

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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
TECHNICAL CHARACTERISTICS
COMBUSTION CHARACTERISTICS
Main Characteristics WM 25 WM 35 WM 45
G20/G25 G31 G20/G25 G31 G20/G25 G31
Input (PCI)
max kW 25.0 25.0 35.0 35.0 45.0 45.0
min kW 5.0 5.0 7.0 7.0 9.0 9.0
DHW eciency (EN89) % 108.5 108.5 108.5 108.5 108.5 108.5
Combustion
eciency at 100% % 98.2 98.2 98.2 98.2 97.9 97.9
NOx (Class 5)
Max. output mg/kWh 64—55—53—
Min. output mg/kWh 12—12—21—
Weighted mg/kWh 29—33—39—
CO
Max. output ppm 27—48—63—
Min. output ppm 6—4—4—
CO2
Max. output %CO28.8 10.1 9.2/8.9 10.7 9.0 10.7
Min. output %CO28.3 9.3 8.8/8.4 10.2 8.4 10.1
Max gas ow rate
G20/G25
20 mbar m³/h 2.66 — 3.64 — 4.67 —
25 mbar m³/h 2.96 — 4.23 — 4.67 —
Max. gas ow rate G31 30/37/50 mbar m3/h — 0.98 — 1.4 — 1.77
Temp of ue gases
Normal °C 57.7 57.7 58.2 58.2 64.1 64.1
Max. °C 120 120 120 120 120 120
Min. °C 32.9 32.9 29.2 29.2 30.1 30.1
Average temp. of combus-
tion products DHW mode °C 52.6 52.6 52.6 52.6 52.6 52.6
Mass ow rate of ue
gases*
Normal g/s 11.6 11.6 15.5 15.5 21.1 20.1
Min. output g/s 2.45 2.54 3.26 3.28 4.36 4.25
Main Characteristics WM 70 WM 85 WM 120
G20/G25 G31 G20/G25 G31 G20/G25 G31
Input (PCI)
max. kW 69.9 69.9 85.0 85.0 115.0 115.0
min. kW 21.5 21.5 21.0 21.0 25.0 25.0
DHW eciency (EN89) % 107.7 107.7 107.7 107.7 107.7 107.7
Combustion
eciency at 100% % 98.1 98.1 98.0 98.0 97.5 97.5
NOx (Class 5)
Max. output mg/kWh 65—48—48—
Min. output mg/kWh 23—26—23—
Weighted mg/kWh 39—36—37—
CO
Max. output ppm 34—51—58—
Min. output ppm 7—6—4—
CO2
Max. output %CO29.0 10.6 8.8/9.2 10.8 8.9/9.1 11.1
Min. output %CO28.4 10.0 8.3/8.4 10.0 8.4 10.4
Max gas ow rate
G20/G25
20 mbar m³/h 7.2 — 8.6 — 12.0 —
25 mbar m³/h 8.3 — 10.0 — 14.0 —
Max. gas ow rate G31 30/37/50 mbar m3/h — 2.77 — 3.37 — 4.68
Temp of ue gases
Normal °C 60 60 62 62 64.6 64.6
Max. °C 120 120 120 120 120 120
Min. °C 29.0 29.0 28.7 28.7 28.7 28.7
Average temp. of com-
bustion products DHW Mode °C 51.0 51.0 51.0 51.0 51.0 51.0
Mass ow rate of ue
gases*
Normal g/s 31.6 31.6 30.8 37.8 50.8 49.8
Min. output g/s 10.19 9.98 10.19 9.98 12.14 11.5
* Mass flow rate values were calculated for G20 and G31 with an air factor of 1.3.

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TECHNICAL CHARACTERISTICS
GAS CATEGORIES (All models)
Gas type G20 G25 G20 G25 G31
Pressure (mbar) 20 20 25 20 25 30 37 50
Country code Category
AT II2H3P
BE
I2E(S)*
I2E(R)**
I3P
CH II2H3P
CZ II2H3P
DE II2E3P
II2ELL3P
ES II2H3P
FI II2H3P
FR II2Er3P
GB II2H3P
GR II2H3P
HR II2H3P
IE II2H3P
IT II2H3P
LT II2H3P
LU II2E3P
LV I2H
NL II2EK3P***
II2L3P
PL II2E3P
PT II2H3P
RO II2H3P
SI II2H3P
SK II2H3P
* WM 25 / 35 / 45 / 70
** WM 85 / 120
*** G25.3