ACV WaterMaster 25 Evo Owner's manual

A1009341-664Y8300 • B
WaterMaster
25 - 35 - 45 - 70 - 85 - 120 Evo
25 - 45 - 70 X Evo
Installation,
Operation &
Maintenance
Instructions for the User and the Installer
EN

2
A1009341-664Y8300 • B
G I.......................................3
Meaning of Symbols............................................................ 4
What to Check on a Regular Basis.................................. 4
End of the product life ........................................................ 4
U’ G........................................................5
Models - WaterMaster® 25 (X) - 35 - 45 (X) - 70 (X) -
85 - 120 Evo ..........................................................................5
Using the Control Panel .....................................................6
Home Screen ........................................................................ 7
Stand-by Screen................................................................... 7
Lockout Screen..................................................................... 7
Status Messages .................................................................. 8
In case of Problem... ............................................................ 8
Controller Set-up Guide .....................................................9
Heating EZ Setup ................................................... 10
DHW EZ Setup ...................................................... 10
Easy Setup Reset ...................................................11
Display Easy Setup ................................................11
CH/DHW Operation ............................................12
Boiler Information .................................................12
T S.............................. 13
Combustion characteristics .............................................13
Electrical Characteristics ..................................................14
Product Fiche Data ............................................................................ 15
Hydraulic Characteristics..................................................16
Maximum Operating Conditions.....................................16
DHW performance..............................................................17
Recommendations for the prevention of corrosion
and scaling in Heating Systems......................................18
Chimney Characteristics...................................................19
Flue Pipe Connection Types.......................................... 20
Calculation of the flue pipe length.................................21
Cascade : calculation of the maximum length of
flue pipes..............................................................................22
Approved Chimney Components..................................23
I ..................................................... 25
Safety Instructions for the Installation .........................25
Tools required for the installation..................................25
Package Contents..............................................................26
Handling instructions........................................................26
Removing the packaging.................................................26
appliance Preparation.......................................................26
Safety Instructions - Hydraulic Circuits........................27
G3 Requirements and Guidance - UK Only................28
Connection of the DHW circuit ......................................28
General Recommendations and Safety
Instructions for the Chimney Connection ...................30
General Recommendations and Safety
Instructions for the Gas Connection..............................31
Conversion to Propane.....................................................32
C ................................................ 34
Tools Required for Starting up .......................................34
Checks before Starting up ..............................................34
Filling the System...............................................................35
Starting up the Appliance................................................36
Checking and Adjusting the Burner .............................36
M.................................................... 37
Safety Instructions for Maintenance.............................37
Torque Values .....................................................................37
Tools Required for Maintenance....................................38
Periodic Appliance Maintenance Tasks.......................38
Appliance shut down for Maintenance........................38
Draining the Appliance.....................................................39
Removal, Check and Installation of the Burner
Electrode ............................................................................. 40
Removal and Installation of the Burner -
WM 25 (X) to 85 Evo .........................................................41
Removal and Installation of the Burner -
WM 120 Evo .........................................................................42
Cleaning the Exchanger...................................................43
Restarting after Maintenance.........................................43
T ........................................... 44
S L....................................................... 47
EN
Table of Contents

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.
Essential instructions 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 causedas aresultofincorrectinstallationor
in the event of the use of appliances or accessories
that are not specified by the manufacturer.
We accept no liability should any damage result from the failure to comply with theinstructions contained in this technical manual.
Essential instructions 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.
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     
 , , ,
,    
   
.
T
  8    
    ,
    
    ,
     
    
       
   .
C   
     
 .
C     
.
A
    
   . ACV
   
    (2) -
   
    -; 
    
     
     
().
GENERAL SAFETY INSTRUCTIONS FOR GAS APPLIANCES
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A1009341-664Y8300 • B
EN
G I

4
A1009341-664Y8300 • B
MEANING OF SYMBOLS
Symbols on the packaging
Fragile
Keep dry
Keep standing, up
Danger of tipping over
Hand truck or pallet truck required for
transport
Symbols on the appliance
Domestic Hot Water (DHW) circuit
Primary circuit
Electricity
Symbols in the manual
Essential instruction for safety (of per-
sons and equipment)
Essential instruction for electrical safety
(electrical hazard)
Essential instruction for the correct oper-
ation of the appliance or the system
General remark
Safety valve connected to the sewage
system
Connection to the sewage system
WHAT TO CHECK ON A REGULAR BASIS
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. Refer also
to the Troubleshooting table in "In case of
Problem..." on page 8 or call your installer
as required.
General remarks
• The end user is only allowed to carry out
the basic set-up operations mentioned in
"Controller Set-up Guide" on page 9,
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 Touch
interface, refer to the
Installer's Handbook
available at www.acv.com.
END OF THE PRODUCT LIFE
At the end of the service life of the product, do not
dispose of the product as solid urban waste. Hand
it over to a dierentiated waste collection centre.
Please contact your installer or your ACV representative
for more information on the removal and disposal of your
appliance.
EN
General Information

5
A1009341-664Y8300 • B
MODELS  WATERMASTER® 25 X  35 
45 X  70 X  85  120 EVO
The WaterMaster® and WaterMaster® X Evo series is a
range of condensing water heaters designed for the ex-
clusive production of Domestic Hot Water. The water heat-
ers 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. Please also
consult the detail of components in the "ML" booklet.
The WaterMaster® X Evo models are equipped with a tank
of bigger capacity. This series is especially designed for
the production of large volumes of hot water and meets
high DHW demands at peak moments. The DHW circuit
recirculation connection also guarantees faster delivery
of hot water to the whole facility. This series is particularly
suitable for places where numerous DHW demands occur
simultaneously, such as hotels, sport centers or hospitals.
WaterMaster
70 X Evo
WaterMaster
25 X - 45 X Evo
All the WaterMaster® Evo 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 heat-
er temperature gets lower than the preset temperature
and stops as soon as the preset temperature is reached.
The WaterMaster® Evo series features a built-in frost pro-
tection mechanism: as soon as the flow temperature [NTC1
probe] drops below 7°C, the primary pumps are activated.
As soon as the flow temperature is at 5°C, the burner starts
up until the flow 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 Evo
WaterMaster
70 - 85 - 120 Evo
EN
U’ G

6
A1009341-664Y8300 • B
USING THE CONTROL PANEL
1 - ACVMax Touch control panel - It is comprised of an
LCD display and soft keys reacting to the touch
2 - ACVMax LCD Display - It is the setup interface of
the appliance and indicates the parameter values,
the error codes and the set-up status of the parame-
ters. It displays a series of screens, each showing in-
formation and/or icons. The main icons are detailed
on the following page.
3 - Installer function - By touching simultaneously the
up and down arrow keys for 3 seconds, the installer
can open the access code window of the ACVMax
Touch controller and set up the system once the
code has been filled in.
4- Arrow touch keys and OK/Reset touch key - To
browse through the screens and menus of the
ACVMax controller, set up the appliance, increase
and decrease the displayed values and validate
the selections. The OK/Reset key is also used to
RESET the appliance after a blocking (following the
instructions on the screen).
5- Sleeping mode soft key - To put the unit in a sleeping
mode.
When touching the soft key, the unit
is in a sleeping mode but is not isolated
from power supply. Therefore, live current
is still present in the unit. For your safety,
disconnect electrical power supply to the unit
before maintenance or making any electrical
connections to avoid possible electric shock
hazard. Failure to do so can cause serious
injury, or death.
• When putting in sleeping mode using the
soft key, the appliance will not react to any
heat demand. However, the basic appliance
protection functions (such as frost protection,
etc.) remain active.
• In addition, the arrow soft keys are no longer
illuminated, and the soft key lighting is
dimmed.
6- ON/OFF Master switch - To turn the appliance ON
and OFF. When in OFF position, no power is sup-
plied to the appliance.
The ACVMax navigation is performed through soft keys
that react to the touch and emit a short beep when tapped.
Exert a light and short touch (tap) on the
soft keys to activate their function. Holding
the touch too long will not generate any
reaction from the ACVMax Touch, unless it is a
combination of soft keys meant to be touched
simultaneously for a determined duration, as
instructed in this manual. The arrow keys can
also be held longer to increase or decrease
values faster.
Navigation through the menus and selection of items/
modification of values is performed through four arrow
soft keys , , , . The center soft key is
used for validation (and for Reset in some cases).
The installer is provided with full access to all available
features after simultaneously touching the and
soft keys for 3 seconds and entering a code.
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Pressure: 1.5 bar
WaterMaster
12345 6
EN
User’s Guide

Stand-by
84°C
61°C
Target = --
WaterMaster
Low Water
Water pressure has fallen below
0.7 bar. Increase pressure
to normal range.
If problem persists,
call for service
E37 Lockout reference code. Refer to "In
case of Problem..." on page 8
for more information.
Body text. The first sentence de-
scribes 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.
7
A1009341-664Y8300 • B
HOME SCREEN
The Home Screen presents status information in a very
user-friendly way so that the current state of the appliance
can be quickly accessed.
• Screen backlight - it will illuminate when any soft
key is touched, and remain illuminated for five
minutes.
• Screen brightness - it can be adjusted at the
Home screen by touching and holding simulta-
neously the and soft keys for 2 seconds.
Touch the and soft key to increase or de-
crease the contrast. Touch to end the process.
Main Icons of the ACVMAX Touch display
DHW - indicates information related to Domestic
Hot Water.
Home - to go back to the home 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 temperature.
Reset - to reset the system to the factory settings.
Settings - to access controller settings (languages,
units, etc.).
Easy Setup - to quickly adjust the most common
settings.
CH/DHW operation - to enable/disable the Do-
mestic Hot Water function
Information - to get information on the appliance.
STANDBY SCREEN
This screen is displayed at start-up. It indicates that the
WaterMaster is ready to respond when a demand is re-
ceived.
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 lo-
cated in paragraph "In case of Problem..." on page 8,
or with the Lockout code table in the Installer’s Handbook
(for the installer only).
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Pressure: 1.5 bar
WaterMaster Tap icon: indicates that a DHW call has been
received.
Circulator icons: indicate which circulators are
currently powered.
Status line: displays the current operating state
of the appliance. See next page.
Basic information: The user can toggle through
items using the and soft keys to view
Target, Supply, Return, Domestic, Outdoor and
System temperatures, and primary pressure.
The appliance is represented in the center of the Home Screen. Basic operating informa-
tion such as supply and return temperatures are displayed as well as current burner status.
Aflame symbol is displayed when the unit is fired. The
flame size changes to indicate the current firing rate.
EN
User’s Guide

8
A1009341-664Y8300 • B
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 fire until the
call blocking time has elapsed.
• DHW Setpoint Reached - The burner is not fired be-
cause the supply/system water temperature exceeds
the setpoint. The built-in domestic circulator continues
to operate and the burner will fire again once the sup-
ply/system water temperature drops below the set-
point.
• DHW Post Pump - The domestic hot water circulator
is running to remove heat from the WaterMaster at the
completion of a call.
• Freeze Protection - The burner is fired because the
freeze protection feature has been activated. Freeze
protection will end once the supply/system water tem-
perature is raised to 15°C.
• Boiler Protection - The burner firing rate is being re-
duced because of an excessive dierence between
the water heater supply and return temperatures. The
firing rate will begin increasing once the temperature
dierence is less than 25°C.
• Lockout Description - The lockout which currently has
the WaterMaster shut down is displayed
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"Troubleshooting" on page 44.
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 ap-
pliance power plug is connected to the net-
work.
E 01 Failed ignition The burner failed to light after 5 ignition
attempts Check gas supply to the appliance.
E 13 Reset limit reached Resets are limited to 5 every 15 minutes Turn unit OFF and ON to resume normal op-
eration.
E 34 Low voltage Line voltage has fallen below an accept-
able operating level
The appliance will automatically reset once
line voltage returns to normal.
E 37 Low Water Water pressure has fallen below an ac-
ceptable operating level (0.7 bar)
Refill the system to reach a normal range
pressure. The appliance will automatically
reset once water pressure returns to nor-
mal.
E 94 Internal Display Fault Display memory error Turn appliance o and on to resume normal
operation.
EN
User’s Guide

• To navigate on the screen, use the UP, DOWN, LEFT and RIGHT soft keys ,
• Use the OK key to validate a selection.
• To increase/decrease values, use the UP and DOWN keys, or LEFT and RIGHT, according to
the situation
9
A1009341-664Y8300 • B
CONTROLLER SETUP GUIDE
Starting from the Home screen :
DHW EZ Setup EZ Setup Reset Display EZ Setup
CH / DHW Operation Boiler Information
Select Language
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
English
Français
Nederlands
Español
Italiano
Deutsch
Select Language Lockout History
a
b
c
d
e
f
b
b
b
b
a
b
c
d
e
f
b
b
b
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b
Boiler Protection
P3
DHW
P4
84°C
61°C
CH
Pressure: 1.5 bar
WaterMaster
EZ Setup
Although the menu and
functions are accessible,
the heating circuit cannot
be enabled on the
WaterMaster.
DHW enabled
EN
User’s Guide

10
A1009341-664Y8300 • B
HEATING EZ 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 influence 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.
EZ Setup
DHW EZ Setup
DHW EZ SETUP
Select DHW Demand prompts the user to select how a DHW De-
mand is generated. There are two Select DHW Demand options.
Thermostat should not be used with Evo models.
Default : Sensor (see below)
DHW Boiler Setpoint should not be used with Evo models
(Default: 75°C).
Touch the or soft keys to adjust the required temperature
setpoint then touch to store the setting.
DHW EZ Setup
Select DHW Demand
Thermostat
Sensor
DHW Setpoint
60°C
20°C 75°C
When Sensor is selected in Select DHW Demand, it operates with the
Indirect Water Heater Sensor. The appliance monitors the DHW storage
temperature and generates a DHW call whenever the temperature drops
below the DHW storage setpoint by 3°C.
DHW Setpoint prompts to enter the DHW storage setpoint tem-
perature.
Touch the or soft keys to adjust the required temperature
setpoint then touch store the setting.
Default: 60°C.
Select DHW Demand
Thermostat
Sensor
DHW
Boiler Setpoint
75°C
35°C 87°C
EN
User’s Guide

11
A1009341-664Y8300 • B
DHW Priority Timeout prompts to enter an optional time limit that a
domestic hot water call has priority.
Touch the or soft keys to adjust the required timeout value, if
required, then touch to store the setting and complete the DHW
setting.
Default: O
DHW EZ Setup
Select DHW Demand
Thermostat
Sensor
DHW Setpoint
60°C
20°C 75°C
DHW Priority Timeout
O
O 120 min.
EZ Setup
EZ Setup Reset
EASY SETUP RESET
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.
EZ Setup Reset
Press OK to restore factory settings,
any other button to keep current
settings.
EZ Setup
Display EZ Setup
English
Français
Nederlands
Español
Italiano
Deutsch Select Unit
Fahrenheit
Celsius
DISPLAY EASY SETUP
Display EZ Setup allows to select the interface language (Nine dif-
ferent languages: English, French, Dutch, Spanish, Italian, German,
Czech, Polish and Russian).
Touch the or soft keys to select the required language then
touch to store the setting.
Display EZ Setup allows to select the interface temperature unit.
Touch the or soft keys to select the required unit then touch
to store the setting.
EN
User’s Guide

12
A1009341-664Y8300 • B
CH / DHW Operation
Lockout History
a
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d
e
f
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b
b
b
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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
CH/DHW OPERATION
CH/DHW Operation provides a simple way to enable/disable the
DHW function of the WaterMaster.
Touch the or soft keys to select the object (CH or DHW icon),
then touch to toggle between the enabled/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 bot-
tom of the screen to go back either to the home page or to the
previous screen respectively.
Default:
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.
Touch the or soft keys to scroll through the items. For more
information, refer to the Installer’s Handbook of the WaterMaster
appliances.
Lockout History records the last eight lockouts. Six lines are dis-
played on the Lockout History screen at one time. Each line con-
tains a lockout description followed by how long ago the lockout
occurred.
Touch the or soft keys to scroll through the items then touch
to select any of them and get more details through the Lockout
Details screen. For more information, refer to the Installer’s Hand-
book of the WaterMaster appliances.
BOILER INFORMATION
Boiler Information
a
b
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d
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b
b
b
b
a
b
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a
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b
b
b
Boiler Information
Boiler Status Standby
Heating Call No
DHW Call No
Boiler Firing Rate --
Ionization current μA
Boiler Setpoint --
DHW enabled
Heating Disabled
DHW enabled
EN
User’s Guide

13
A1009341-664Y8300 • B
COMBUSTION CHARACTERISTICS
WaterMaster Evo
Main Characteristics
25
25 X 35 45 45 X
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) %108.7 108.7 108.5 108.5 108.5 108.5
Combustion eciency at 100% %98.2 98.2 98.2 98.2 97.9 97.9
NOx (Class 6) Max. output mg/kWh 64 — 55 — 53 —
Min. output mg/kWh 12 — 12 — 21 —
Weighted mg/kWh 21.5 — 26.7 — 30.2 —
CO Max. output ppm 27 — 48 — 63 —
Min. output ppm 6 — 4 — 4 —
CO2Max. 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 flow rate
G20/G25
20 mbar m/h 2.66 — 3.64 — 4.67 —
25 mbar m/h 2.96 — 4.23 — 5.6 —
Max. gas flow rate G31 30/37/50 mbar m3/h — 0.98 — 1.4 — 1.77
Kg/h — 1.9 — 2.7 — 3.5
Temp of flue gases
Normal °C 60.0 60.0 58.0 58.0 64.0 64.0
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 combustion
products DHW mode °C 52.6 52.6 52.6 52.6 52.6 52.6
Mass flow rate* of flue 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
* Mass flow rate values were calculated for G20 and G31 with an air factor of 1.3.
EN
T S

14
A1009341-664Y8300 • B
WaterMaster Evo
Main Characteristics
70
70 X 85 120
G20/G25 G31 G20/G25 G31 G20/G25 G31
Input (PCI) max kW 69.9 69.9 85.9 85.9 115.0 115.0
min kW 21.5 21.5 21.0 21.0 23.2 23.2
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 6) Max. output mg/kWh 52 — 72 — 58.3 —
Min. output mg/kWh 27 — 27 — 23.1 —
Weighted mg/kWh 30.3 — 27.0 — 37.4 —
CO Max. output ppm 56 — 75 — 50 —
Min. output ppm 2 — 6 — 8 —
CO2Max. output %CO29.1 10.6 9.3 10.8 9.2 10.6
Min. output %CO28.6 10.0 8.6 10.0 8.6 10.0
Max gas flow rate
G20/G25
20 mbar m/h 7.4 —9.0 — 12.2 —
25 mbar m/h 8.6 — 10.5 — 14.0 —
Max. gas flow rate G31 30/37/50 mbar m3/h — 2.77 — 3.37 — 4.6
Kg/h — 4.2 — 5.1 — 6.9
Temp of flue gases
Normal °C 59.0 59.0 62 62 65 65
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 combustion
products DHW mode °C 51.0 51.0 51.0 51.0 51.0 51.0
Mass flow rate* of flue gases Normal g/s 31.6 31.6 37.8 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.
ELECTRICAL CHARACTERISTICS
WaterMaster Evo
Main Characteristics 25
25 X 35 45 45 X
70
70 X 85 120
Rated voltage V~ 230 230 230 230 230 230
Rated frequency Hz 50 50 50 50 50 50
Electrical consump-
tion
Max. W 95 110 126 280 270 380
Min. W 19 30 40 50 46 70
Electrical consump-
tion at 30% load W24 34 45 55 51 74
Electrical consump-
tion in standby W3 3 3 3 3 4
Rated current (Fuse) A 16 16 16 16 16 16
Class IP 20 IP 20 IP 20 IP 20 IP 20 IP 20
Also refer to "ML" Booklet for Wiring Diagrams.
EN
Technical Specifications

15
A1009341-664Y8300 • B
WaterMaster Evo
25 35 45 70 85 120
Declared load profile for
water heating L L L XXL XXL XXL
Water heating eciency class A A A A — —
Water heating eciency %87.2 87.2 87.2 85.0 85.0 85.0
Annual electricity
consumption kWh 6 6 6 61 — —
Annual energy consumption
for water heating GJ 10 10 10 25 25 25
Working temperature °C 60 60 60 60 60 60
Sound power level indoors
LWA dB 60 60 59 60 61 62
Able to work only during o-
peak hours Y/N N N N N N N
Storage volume l96 96 96 190 190 190
WaterMaster Evo
25 X 45 X 70 X
Declared load profile for water
heating XXL XXL XXL
Water heating eciency class A A A
Water heating eciency %87.5 87.9 85.0
Annual electricity consumption kWh 74.8 68.4 65.3
Annual energy consumption for
water heating GJ 21.4 21.4 22.1
Working temperature °C 60 60 60
Sound power level indoors LWA dB 60 59 60
Able to work only during o- peak
hours Y/N N N N
Storage volume l220 220 300
PRODUCT FICHE DATA
(i.a.w. Commission Delegated Regulation 812/2013)
EN
Technical Specifications

16
A1009341-664Y8300 • B
HYDRAULIC CHARACTERISTICS
WaterMaster Evo
Main Characteristics 25 35 45 70 85 120
Capacity (primary) L100 100 100 125 125 125
Capacity (DHW) L96 96 96 190 190 190
WaterMaster Evo
Main Characteristics 25 X 45 X 70 X
Capacity (primary) L180 180 205
Capacity (DHW) L220 220 300
OPERATING CONDITIONS
Nominal Service Pressure (tank full of water) *
- Primary circuit : ................................................................................................. 2.5 bar
- DHW circuit :........................................................................................................ 8.1 bar
Maximum Service Pressure (tank full of water) *
- Primary circuit : ..................................................................................................... 3 bar
- DHW circuit :...................................................................................................... 8.6 bar
Maximum Operating Temperatures
- Maximum temperature (primary) : ....................................................................87°C
- Maximum temperature (DHW) : ........................................................................75°C
Water Quality
See "Recommendations for the prevention of corrosion and scaling in Heating Systems" on page 18.
* The hydraulics of the water heater have been tested according to EN 89:2015, and the water heater is classified as a pressure class 3 appliance.
EN
Technical Specifications

17
A1009341-664Y8300 • B
DHW PERFORMANCE
Domestic hot water performance* (cold drink water at 10°C)
WaterMaster Evo
Operating conditions at 80°C
25 35 45 70 85 120
Constant flow at
40 °C [T = 30 K] L/h 788 1 104 1390 2087 2534 3402
45 °C [T = 35 K] L/h 676 946 1192 1789 2172 2928
60 °C [T = 50 K] L/h 473 662 820 1252 1520 1754
Peak flow at
40 °C [T = 30 K] L/10’ 361 408 451 716 783 900
45 °C [T = 35 K] L/10’ 301 339 373 592 646 676
60 °C [T = 50 K] L/10’ 183 197 224 348 371 440
Peak flow 1st
hour at
40 °C [T = 30 K] L/60’ 1018 1 328 1610 2455 2895 3620
45 °C [T = 35 K] L/60’ 865 1127 1366 2083 2456 3098
60 °C [T = 50 K] L/60’ 577 749 894 1391 1638 1847
Reheat time from 10°C to 80°C min. 35 26 23 27 24 23
DHW eciency at T = 30 K %105.4 105.4 103.1 103.9 103.9 102.2
WaterMaster Evo
Operating conditions at 80°C
25 X 45 X 70 X
Constant flow at
40 °C [T = 30 K] L/h 788 1390 2 087
45 °C [T = 35 K] L/h 676 1192 1 789
60 °C [T = 50 K] L/h 473 820 1 252
Peak flow at
40 °C [T = 30 K] L/10’ 568 617 951
45 °C [T = 35 K] L/10’ 477 501 816
60 °C [T = 50 K] L/10’ 327 332 610
Peak flow 1st hour at
40 °C [T = 30 K] L/60’ 1207 1793 2 578
45 °C [T = 35 K] L/60’ 1035 1537 2 210
60 °C [T = 50 K] L/60’ 724 1076
1 547
Reheat time from 10°C to 80°C min. 61 40 43
DHW eciency at T = 30 K % 105.4 103.1 103.9
EN
Technical Specifications

18
A1009341-664Y8300 • B
RECOMMENDATIONS FOR THE PREVENTION OF CORROSION AND SCALING IN
HEATING SYSTEMS
How oxygen and carbonates can aect the
heating system
Oxygen and dissolved gasses in the water of the prima-
ry circuit contribute to the oxidation and the corrosion of
the system components that are made of ordinary steel
(radiators, ...). The resulting sludge is then deposited in the
appliance exchanger.
The combination of carbonates and carbon dioxide in the
water results in the formation of scale on the hot surfaces of
the installation, including those of the appliance exchanger.
These deposits in the heat exchanger reduce the water
flow rate and thermally insulate the exchange surfaces,
which is likely to damage them.
Sources of oxygen and carbonates in the
heating circuit
The primary circuit is a closed circuit; the water it contains is
therefore isolated from the mains water. When maintaining
the system or filling up the circuit, water renewal results in
the addition of oxygen and carbonates in the primary cir-
cuit. The larger the water volume in the system, the larger
the addition.
Hydraulic components without an oxygen barrier (PE pipes
and connections) admit oxygen into the system.
Prevention Principles
1. Clean the existing system before installing a new ap-
pliance
Before the system is filled, it must be cleaned in accordance
with standard EN14336. Chemical cleaning agents can be
used.
If the circuit is in bad condition, or the cleaning operation was
not ecient, or the volume of water in the installation is sub-
stantial (e.g. cascade system), it is recommended to separate
the appliance from the heating circuit using a plate-to-plate
exchanger or equivalent. In that case, it is recommended to
install a hydrocyclone or magnetic filter on the installation
side.
2. Limit the fill frequency
Limit fill operations. In order to check the quantity of water
that has been added into the system, a water meter can be
installed on the filling line of the primary circuit.
Automatic filling systems are not recommended unless the
fill frequency is monitored and the scale and corrosion inhib-
itor remain at the correct levels.
If your installation requires frequent water refilling, make sure
your system is free of water leaks.
Inhibitors may be used in accordance with standard EN
14868.
3. Limit the presence of oxygen and sludge in the water
A deaerator (on the appliance flow line) combined with
a dirt separator (upstream of the appliance) must be in-
stalled according to the manufacturer's instructions.
ACV recommends using additives that keep the oxygen
in solution in the water, such as Fernox (www.fernox.com)
and Sentinel (www.sentinel-solutions.net) products.
The additives must be used in accordance with the in-
structions issued by the manufacturer of the water treat-
ment product.
4. Limit the carbonate concentration in the water
The fill water must be softened if its hardness is higher
than 20° fH (11,2° dH).
Check regularly the water hardness and enter the values
in the service log.
Water hardness table :
5. Control the water parameters
In addition to the oxygen and the water hardness, other
parameters of the water must be checked.
Treat the water if the measured values are outside the
range.
Water hardness °fH °dH mmolCa(HCO3)2 / l
Very soft 0 - 7 0 - 3.9 0 - 0.7
Soft 7 - 15 3.9 - 8.4 0.7 - 1.5
Fairly hard 15 - 25 8.4 - 14 1.5 - 2.5
Hard 25 - 42 14 - 23.5 2.5 - 4.2
Very hard > 42 > 23.5 > 4.2
Acidity 6,6 < pH < 8,5
Conductivity < 400 S/cm (at 25°C)
Chlorides < 125 mg/l
Iron < 0,5 mg/l
Copper < 0,1 mg/l
EN
Technical Specifications

19
A1009341-664Y8300 • B
CHIMNEY CHARACTERISTICS
WaterMaster Evo
Main Characteristics 25
25 X 35 45 45 X
70
70 X 85 120
Air/flue pipe Ø
concentric mm 80/125 80/125 80/125 100/150 100/150 100/150
parallel mm 80/80 80/80 80/80 100/100 100/100 100/100
Max. allowed flue pipe pressure
drop Pa 95 130 130 110 160 170
Max recommended length of concentric
flue pipe (corresponding length in meters of
straight pipes) * Ø 80/125, terminal included
60 39 22 — — —
Max recommended length of concentric
flue pipe (corresponding length in meters
of straight pipes) * Ø 100/150, terminal
included
130*** 90*** 53*** 20 19 18
Max recommended length of dual flow
(corresponding length in meters of straight
pipes) *
Rigid
Ø 80
Flex.
Ø 80
Rigid
Ø 80
Flex.
Ø 80
Rigid
Ø 80
Flex.
Ø 80
Rigid
Ø 100
Flex.
Ø 100
Rigid
Ø 100
Flex.
Ø 100
Rigid
Ø 100
Flex.
Ø 100
Rigid
Ø 100
Flex.
Ø 100
56 26 37 17 19 9 76 34 17 8 17 8 9 4
Available connection types B23 - B23P - C13(x) - C33(x) - C43(x) - C53(x)** - C63(x) - C83(x), C93(x)
* See page 21 to calculate the flue pipe length.
** A C53 connection of the WaterMaster Evo appliances requires an optional accessory.
*** Not recommended - For more information, please contact your ACV representative.
C13 C33
C53
C43
C43
C43 C33 B23P
C43
C43
C43 C93
B23
It is mandatory to ventilate the boiler room. The high or low air vent
opening dimensions depend on the appliance power and the boiler
room size. Refer to the local regulations in force.
Make sure that the air inlet openings remain unobstructed at all times
and that air and flue pipe connections are tight and secure.
EN
Technical Specifications

20
A1009341-664Y8300 • B
FLUE PIPE CONNECTION TYPES
It is mandatory to use ACV flue systems to
connect the appliance.
B23p: Connection to a combustion product exhaust sys-
tem designed to operate with positive pressure.
B23 Connection to an exhaust duct that discharg-
es the combustion products outside the room
where it is installed, with the combustion air be-
ing drawn directly from the boiler room.
C13(x) Connection using pipes fitted with a horizontal ter-
minal that simultaneously takes in combustion air
for the burner and discharges combustion prod-
ucts outside through openings that are either con-
centric or close enough together to be subjected
to similar wind conditions, i.e. openings shall fit in-
side a square of 50 cm for appliances up to 70 kW
and inside a square of 100 cm for appliances above
70 kW.
C33(x) Connection using pipes fitted with a vertical ter-
minal that simultaneously takes in fresh air for the
burner and discharges combustion products out-
side through openings that are either concentric
or close enough together to be subjected to sim-
ilar wind conditions , i.e. openings shall fit inside a
square of 50 cm for appliances up to 70 kW and
inside a square of 100 cm for appliances above
70 kW.
C43(x) Connection using two pipes to a collective duct
system serving more than one appliance; this
system of collective ducts features two pipes
connected to a terminal unit that simultaneously
takes in fresh air for the burner and discharges
the combustion products outside through open-
ings that are either concentric or close enough
together to be subjected to similar wind condi-
tions. C43(x) appliances are suitable for a con-
nection to a natural draught chimney only.
C53(x) Connection to separate ducts for supplying
combustion air and discharging combustion
products; these ducts may end in zones with
dierent pressure levels, but are not allowed to
be installed on opposite walls of the building.
C63(x) Type C appliance meant to be connected to a sys-
tem for supplying combustion air and discharging
combustion products, that is approved and sold
separately (Prohibited in some countries (e.g.
Belgium) - refer to local regulations and stand-
ards in force). Terminals for the supply of com-
bustion air and for the evacuation of combustion
products are not allowed to be installed on oppo-
site walls of the building. See also the following
additional specifications:
• Maximum allowable draught is 200 Pa.
• Maximum allowable pressure dierence between
combustion air inlet and flue gas outlet (including
wind pressures) is as follows: 95 Pa (WM 25 (X)
Evo), 130 Pa (WM 35-45 (X) Evo), 110 Pa (WM 70 (X)
Evo), 160 Pa (WM 85 Evo) and 170 Pa (WM 120 Evo).
• Condensate flow is allowed into the appliance.
• Maximum allowable recirculation rate of 10% un-
der wind conditions.
C83(x) Connection using a single or double duct sys-
tem. The system is made of a normal exhaust
flue duct that discharges the combustion prod-
ucts. The appliance is also connected through a
second duct fitted with a terminal, that supplies
the burner with fresh outdoor air. Please con-
tact your ACV representative for the meters
of flue pipes that can be used to connect the
appliance(s).
C93(x) Connection using an individual system whose
combustion product exhaust duct is installed in
an exhaust duct that is integral with the building.
The appliance, the exhaust duct and the termi-
nal units are certified as an inseparable assem-
bly. Minimum usable diameter for the vertical
duct supplying the combustion air is 100 mm.
The C93 configuration enables airtight
operation in a pre-existing chimney. The
combustion air crosses the space between
the tubing and the pre-existing chimney.
Make sure to clean the pre-existing chimney
thoroughly prior to installation, especially if
there is soot or tar residue. Make sure that
there is a clearance area for the combustion
air at least equivalent to the area that would
have been provided by separate concentric
ducts or air intake ducts.
EN
Technical Specifications