ACV HeatMaster 25 C Assembly instructions

excellence in hot water
INSTALLATION,
OPERATING AND
MAINTENANCE
INSTRUCTIONS
ENGLISH
11/2010 - 664Y4500 • D
25 C
HeatMasterHeatMaster
®


664Y4500 • D
ENFRRU PL DE IT ES NL
INDEX
IMPORTANT NOTES 4
Who should read these instructions 4
Symbols 4
Recommendations 4
Certification 4
Important notes 4
HEATING WATER RECOMMENDATIONS 5
Generality 5
Principle of prevention 5
Installation cleaning 5
INTRODUCTION 6
Working principle 6
Technical Characteristics 7
Hot water performance 7
Frost protection 7
USER GUIDE 8
Use of the ESYS controller 8
TECHNICAL CHARACTERISTICS 9
General characteristics 9
Domestic hot water provision 10
Gas categories 10
ELECTRICAL CONNECTION 11
Schematic diagram 12
INSTALLATION INSTRUCTIONS 13
Dimensions 13
Hydraulic connection 13
Boiler Room 13
Accessibility 13

 664Y4500 • D
ENFRRU PL DE IT ES NL
INDEX
INSTALLATION 14
Flue connection 14
Gas connection 16
Domestic hot water connection 16
Central heating connection 17
Installation of a single heating circuit with regulation by ACV 22 room thermostat 18
Installation of a single heating circuit regulated by the Room Unit 20
COMMISSIONING AND MAINTENANCE 22
Commissioning of the installation 22
Checking the settings 22
Boiler maintenance 22
Temperature sensor resistance table 22
Dismantling the burner 23
Disassembling and inspecting the electrode 23
Cleaning the exchanger 23
ESYS PARAMETERS FOR THE SPECIALIST 24
Code mode 24
Communication mode 25
Parameter mode 26
Test Mode 28
Error Mode 29
Info mode 30
ESYS ERRORS AND BLOCKING CODES 32
List of error codes and solutions 32


664Y4500 • D
ENFRRU PL DE IT ES NL
WHO SHOULD READ THESE INSTRUCTIONS
These instructions should be read by:
- the design engineer/consultant
- the user
- the installer
- the service engineer
SYMBOLS
The following symbols are used in this manual:
             

 
 

 

 

CERTIFICATION
The appliances bear the “” mark, in accordance with the standards in force
in the various countries [European Directives  “Efficiency”, 
 “Gas Appliances”].
These appliances also bear the Belgian gas boiler quality label
“”[condensing gas boiler].
IMPORTANT NOTES

- Isolate the gas supply immediately.
- Ventilate the room (Open the windows).
- Do not use electrical appliances and do not operate switches.
- Notify your gas supplier and/or your installer immediately.
This manual forms part of the items delivered with the appliance and must be
given to the user to keep in a safe place!
The system must be installed, commissioned, serviced and repaired by an
approved installer, in accordance with current standards in force.
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.
         

          

ImportaNt NotEs
RECOMMENDATIONS
          

             

 

         
 

            

 
 



 






DANGER
HOT

 664Y4500 • D
ENFRRU PL DE IT ES NL
GENERALITY
Filling water contains elements susceptible to damage boilers heat exchangers
in case their concentration goes out of an adequate range.
The risk is growing with the size of the installation since the water content per
installed kW increases.
PRINCIPLE OF PREVENTION

Depending of the volume of the installation, a certain amount of oxygen is
introduced in the installation. During the exploitation of the installation, some
oxygen can be brought in the system in case of water re-filling and/or presence
of hydraulic components without oxygen barrier (PE tubes & connectors).
The oxygen reacts with the steel creating corrosion and generating sludges.
While the ACV heat exchanger is made of stainless steel and is by consequent
not sensible to corrosion, the sludges generated in carbon steel part of the
installation (radiators, …) will lay down in the hot parts including the heat
exchanger.
The sludges in the heat exchanger have the effect to reduce the water flow rate
and to thermically insulate the active parts of the heat exchanger, what could
lead to damages.

- mechanical system : an air remover combined to a sludges remover installed
following the constructors specifications limits efficiently the risk of oxygen
in the installation;
- chemical system : additives allow the oxygen to stay in solution in the water.
ACV recommends the additives from Fernox (www.fernox.com) and from
Sentinel (www.sentinel-solutions.net).
note that these products must be used in strictly accordance with the water
treatment manufacturer’s instructions.

Depending of the volume of the installation, the hardness of water and the
possible re-filling, a certain amount of lime is introduced in the installation.
The lime will lay down in the hot parts, including the heat exchanger creating a
reduction of the water flow rate and a thermal insulation of the active parts of
the heat exchanger. That phenomena can damage the heat exchanger.
Acceptable hardness range:
mmolCa(HCO3)2/ l °DH °FH
0,5 - 1 2,5 - 5,6 5 - 10

the filling and re-filling water must be softened if necessary to match the
working range. Additives can be used to keep the calc in solution in the water,
ACV recommends the additives from Fernox (www.fernox.com) and from
Sentinel (www.sentinel-solutions.net).
note that these products must be used in strictly accordance with the water
treatment manufacturer’s instructions.
The water hardness must be check regularly and recorded in a file.

In addition to the oxygen and the hardness, some other parameters must be
controlled in the water of heating installations.
Acidity 6,6 < pH < 8,5
Conductivity < 400 μS/cm (a 25°C)
Chloride < 125 mg/l
Iron < 0,5 mg/l
Cu < 0,1 mg/l
Those parameters has to be measured and water needs chemical treatment
in case of values out of range. ACV recommends the additives from Fernox
(www.fernox.com) and from Sentinel (www.sentinel-solutions.net).
Note that these products must be used in strictly accordance with the water
treatment manufacturer’s instructions.
INSTALLATION CLEANING
Before filling an installation, it must be cleaned following the standard
.
Chemical cleaners can be used, ACV recommends the additives from Fernox
(www.fernox.com) and from Sentinel (www.sentinel-solutions.net).
Note that these products must be used in strictly accordance with the water
treatment manufacturer’s instructions.
        
       

H E at I N G Wat E r r EC om m E N DatI o N s


664Y4500 • D
ENFRRU PL DE IT ES NL
INtroDuCtIoN
WORKING PRINCIPLE

ACV Tank-in-Tank technology has been widely tried and tested and is
extremely simple and reliable.
The core of the   features a ring-shaped stainless steel tank,
through which the flue tubes pass. It is surrounded by a steel shell containing
the primary fluid; this outer shell extends down to the combustion chamber
and also surrounds the flue tubes. The primary fluid is directly heated during
the combustion process and this indirectly heats the sanitary water.
Like all Tank-in-Tank cylinders, the inner cylinder is corrugated along its entire
height and is suspended in the boiler by the sanitary connections.
The heat exchange surface of the tank is much greater than that of traditional
generators. A large heat exchange surface means that the Tank-in-Tank cylinders
have a much shorter reheat time than traditional hot water boilers, thereby
minimising the volume of water stored. The higher storage temperature in the
tank is also the reason for the much higher hot water flow rates.
HeatMaster® 25 C
1. Cold water inlet
2. Auto-air vent
3. Stainless steel “Tank-in-Tank” hot water cylinder
4. Safety valve (3 bar) + pressure gauge
5. Modulating AIR/GAS premix burner
6. Domestic hot water outlet
7. Gas connection
8. Stainless steel heat exchanger
9. Heating circuit
10. Control panel
11. Expansion vessel
12. Rigid expanded polyurethane foam insulation
13. Boiler charging pump
14. Base
1
10
3
4
2
11
5
8
13
9
14
6
7
12

 664Y4500 • D
ENFRRU PL DE IT ES NL
INtroDuCtIoN
DESCRIPTION OF THE TECHNICAL
SPECIFICATIONS
The   is a hot water generator linked to a condensing boiler
meeting the requirements of “” standards in force in Belgium. The
boiler is certified in compliance with “” standards as a room sealed
appliance: , but it can also be
connected as an open appliance in category B23 or as an appliance operating
at positive pressure from the  category.


The boiler is enclosed in a steel casing, which has been degreased,
had a phosphate treatment process and then stove enameled at 220 °C.
The inside of this casing is lined with a layer of thermal and acoustic insulation,
which minimizes losses.

The core of the  features a new stainless steel heat exchanger
which is a result of exhaustive research and intensive laboratory tests.
This reflects almost 90 years of experience in the use of stainless steel for
heating and hot water generation systems. The specific geometry of the
exchanger has been calculated in order to obtain a very large Reynolds number
through all of its routes. The   thus achieves an exceptional
output remaining stable throughout the boiler’s lifespan, given that it does
not produce any oxidation on the exchanger, which is manufactured entirely
of quality stainless steel.

ACV uses its BG 2000-M burner for the : this is a modulating air/
gas premix burner providing safe and quiet operation while limiting emissions
(NOx and CO) to an incredibly low level. Although the ACV BG 2000-M burner
is very modern, it uses proven technology and is manufactured using standard
spare parts that are easily available on the market.

The   is fitted with an “” regulator controlled
by a microprocessor, which handles the safety functions (ignition, flame
monitoring, temperature limitation, etc,) and the temperature control of the
boiler. The  also features a weather dependent regulator. Simply connect
the outdoor temperature sensor, available as an option.
However, this regulator can also operate with a standard (on/off) room
thermostat. The temperature of the system is then dependent on the outside
conditions with compensation for the indoor temperature.
Two rotating buttons placed on the control panel are accessible to the
user, enabling adjustment of the temperature of the heating and domestic
hot water. By entering a specific maintenance code into the unit, qualified
installers may access certain parameters, in order to adapt the boiler to specific
requirements. In principle, these are factory preset for all normal applications.
HOT WATER GENERATION
In addition to its exceptional capacities for hot water production,
the Tank-in-Tank system by ACV offers the following advantages:
  the corrugations allow
the tank to expand and contract during the heating cycle and thereby to
prevent the build-up of limescale deposits.
 
the tank is fully immersed in the primary circuit and the domestic
water is permanently maintained at a uniform temperature of greater
than 60°C.
 thanks to its
stainless steel design.
This   also enables you to choose between two sanitary
function methods.
 : (factory preset) the boiler cuts the heating circuit
each time the domestic circuit requires it.
 : (only with a radiator heating circuit) the boiler
functions for heating and domestic hot water at the same time.
FROST PROTECTION
The boiler is equipped with integrated frost protection: as soon as the outlet
temperature [NTC1 probe] goes below 7 °C, the circulator becomes active.
As soon as the outlet temperature is lower than 3 °C, the burner starts upuntil
the outlet temperature exceeds 10 °C and the circulator continues to run for
approximately 10 minutes.
If an outdoor temperature probe is connected, the circulator is activated when
the outside temperature drops below the preset threshold.


664Y4500 • D
ENFRRU PL DE IT ES NL
usEr GuIDE
1
2
7
3
4 5
6
USE OF ESYS REGULATOR
The LCD display illustrated opposite enables visualisation of all of the boiler’s
functions.

The illustration opposite represents all symbols and information that the
display can show during its function.

The heating system must be kept pressurised [see “COMMISSIONING”
chapter – how to determine the operating pressure].
The hydraulic circuit pressure is permanently monitored by a pressure sensor.
If the pressure is less than 0.8 bar the display will show “LOP” (Low Pressure)
to indicate to you that filling of the hydraulic circuit is necessary.
For more information, please ask your installer when the system is delivered.
 

The temperature setting of the appliance and the safety functions of the
boiler’s various parts are constantly monitored by the “” system.
If a fault occurs, the ESYS turns the unit off and displays an error code: the
screen flashes and the first character is an “E” followed by the fault code (see
list of faults).
To reset the unit:
- Execute the “”function by turning the domestic setting button to
the left up to minimum, then continue to turn the button lightly and hold
for 3 seconds.
- If the fault code appears again, contact your installer.
1. Numerical field displaying the temperatures
2. Temperature symbol
3. Symbol to select heating mode
4. Symbol indicating that the burner is operating
5. Symbol indicating that the DHW charging pump is operating
6. Symbol to select domestic hot water mode
7. Bar symbol
 
Range adjustable from 20°C to 90°C.
When the thermostat is positioned on , the heating circuit
is deactivated and the boiler is then in summer mode.
 
Range adjustable from 20°C to 90°C.
To operate the “”function, turn the domestic hot water
adjustment button to the left up to minimum, then continue
to turn the button lightly and hold for 3 seconds.



A B

 664Y4500 • D
ENFRRU PL DE IT ES NL
tECHNICal CHaraCtErIstICs
GENERAL CHARACTERISTICS

 Natural Gas Propane
Max. heat ow in heating mode [Input] kW 25 25
Max. heat ow in hot water mode [Input] kW 35 30
Min. heat ow [Input] kW 6 6
Max. useful power 80/60°C kW 24.2 24.2
Min. useful power 80/60°C kW 5.8 5.8
Eciency at 100% load 80/60°C %96.5 96.5
Eciency at 100% load 50/30°C %107.0 107.0
Eciency at 30%load [EN677] %107.5 107.5
Flue gases
CO emissions [max power] mg/kWh 31 40
NOx emissions [EN483] mg/kWh 22.8 45
NOx class [EN483] 5 5
Flue gas temperature - Max output power 80/60°C °C 63 63
Mass ow rate of combustion products kg/h 41.4 41.0
Maximum pressure loss for the ftlue Pa 130 130
Maximum length of concentric ue pipe Ø 80 / 125 mm m20 20
Gas
Gas ow rate G20 - 20 mbar m3/h 2.64
Gas ow rate G25 - 25 mbar m3/h 3.08
Gas ow rate G31 - 37 mbar m3/h 1.02
CO2[max power] % CO28.6 10.5
CO2[min power] % CO28.5 10.5
Gas connection (male) Ø3/4" 3/4"
Hydraulic parameters
Maximum operating temperature °C 90 90
Heating circuit capacity L126.5 126.5
Capacity of the domestic circuit L75 75
Max operating pressure of the heating circuit Bar 3 3
Heat exchanger pressure drop [∆T = 20°C] mbar 30 30
Heating connection (female) Ø1" 1"
DHW connection (male) Ø3/4" 3/4"
DHW cylinder heat exchange surface m21.59 1.59
Nominal ow L/h 1100 1100
Electrical connection
Class IP 30 30
Supply voltage V/Hz 230 / 50 230 / 50
Maximum absorbed electrical power W
Weight Empty (boiler packaged) kg 158 158


664Y4500 • D
ENFRRU PL DE IT ES NL
tECHNICal CHaraCtErIstICs
DOMESTIC HOT WATER PROVISION
 HeatMaster ® 25 C
Peak ow rate at 40°C [∆T = 30°C] L/10' 365
Peak ow rate at 40°C [∆T = 30°C] L/60' 1172
Continuous ow rate at 40°C [∆T = 30°C] L/hour 976
Peak ow rate at 60°C [∆T = 50°C] L/10' 200
Peak ow rate at 60°C [∆T = 50°C] L/60' 688
Continuous ow rate at 60°C [∆T = 50°C] L/hour 586
Reheat time for domestic hot water Minutes 30
I2E(S) I3P I3B I2Er I2L I2E I2ELL I2H I2HS
[G20] (mbar) 20 20 20 20 20
[G25] (mbar) 25 25 25 25 25
[G30] (mbar) 30 50
[G31] (mbar) 30 37 50
AT Austria
BE Belgium
CH Switzerland
CY Cyprus
CZ Czech Republic
DE Germany
DK Denmark
EE Estonia
ES Spain
FR France
GB Great Britain
GR Greece
HR Croatia
HU Hungary
IE Ireland
IT Italy
LT Lithuania
LU Luxembourg
NL Netherlands
NO Norway
PL Poland
PT Portugal
RO Romania
SE Sweden
SI Slovenia
SK Slovakia
TR Turkey


 
 




GAS CATEGORIES: HeatMaster® 25 C models

 664Y4500 • D
ENFRRU PL DE IT ES NL
ElECtrICal CoNNECtIoN


664Y4500 • D
ENFRRU PL DE IT ES NL
12345678910 11 12 13 14 12341 2 3 4 1 2 3 4 5 6 5 6 7 8 1 2 3 4 5 6 7 8 9 10
BUS A
NTC 4NTC 3
BUS B
Safety
thermostat
Not
used
W
91011121314151617181920
R
W
Br
Br
Gr
Gr
W
G
R
Bk
Bk
Bk
W
R
W
R
R
Bk
Bk
Gr
W
W
R
Bk
Gr
R
Bk
W
W
W
W
W
W
W
Y
Br
W
Br
Y
W
W
V
BrBr
Y / Gr
B
V
B
Y / Gr
Y / Gr
Br
B
Y / Gr
Y / Gr
Y / Gr
Y / Gr
Y / Gr
B
V
Br
W
B
B
B
Br
B
B
Br
B
Br
Y / Gr
Y / Gr
R
Bk
R
Bk
Y
Y
R
Bk
W
V
1 2 3 4 1 2
1 2 3 4 5 6
1 2 3 4 5 6 1 2 3 41 2 3 4 5 6 7 8 9 10
111
34 12
456 123
5678 1234
678910 12345
12345
456 123
678910 12345
34 12
231
231 4
123 46
12345123
Y / Gr
B
B
Br
W
X2 X1 X0
X13
8910 11 12 13 14
1234567
X15X14X12 X11
F00
ON / OFF
NTC 2 NTC 1 NTC 5
1 2 3 1 21 2 1 2 3 4 5
12345 321123
5 4 3
2
12
10
91187
6
13
14
15
230 V ~ 50Hz
1
12345678
Not
used
PENLPENL
ElECtrICal CoNNECtIoN
B. Blue Bk. Black Br. Brown Gr. Green Or. Orange R. Red V. Violet W. White Y. Yellow Y/Gr. Yellow/Green
1. 230V ~ 50 Hz supply 2. On/Off switch 3. Burner feed 4. Charging pump 5. Gas valve rectifier 6. Pressure sensor
7. NTC2 return sensor 8. NTC1 flow sensor 9. Connection terminal 10. Clip-in connector (option)
11. NTC5 flue-gas temperature sensor 12. Burner PWM plug 13. Connection for the heating pump (not supplied)
14. ESYS programming interface 15. “ESYS”
Not
used
Not
used
Safety
thermostat
ON / OFF

 664Y4500 • D
ENFRRU PL DE IT ES NL
INstallatIoN INstruCtIoNs
Min. 300 mm
Min. 25 mm Min. 25 mm
INSTALLATION AREA
- Make sure that all air vents are unobstructed.
- Do not store any flammable materials in this room.
- Do not store any corrosive materials, paint, solvents, salts, chlorine
products or any other detergent products in the vicinity of this
appliance.
- If you smell gas, do not operate electrical switches, close the gas valve
on the meter, ventilate the rooms and contact your installer.
ACCESSIBILITY
The appliance must be placed in such a way that it is always easily
accessible. Furthermore, the unit must have the following minimum
clearance around it.
DIMENSIONS
A
mm
B
mm
C
mm
D
mm
E
mm
F
mm
G
mm
H
mm
I
mm
HeatMaster ® 25 C 1700 590 350 1015 360 213 770 370 716
B
H
A
I
G
C
F
D
E
B
H
A
I
G
C
F
D
E
HYDRAULIC CONNECTIONS HeatMaster ® 25 C
Heating connection [F] Ø1"
DHW connection [M] Ø3/4"
Gas supply [M] Ø3/4"
Min. 25 mm Min. 25 mm
Min. 300 mm


664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N
FLUE CONNECTION
- The connections must comply with the  standard taking into
account local energy suppliers’ instructions, fire regulations and regulations
relating to “pollution”.
- Thanks to its built-in gas/air ratio regulator, the  is, to a large
extent, independent of pressure drops in the air intake and flue-gas exhaust
systems. However, the maximum pressure drop of this system may not be
exceeded; otherwise, the output would diminish. However, the gas/air ratio
regulator always guarantees optimal combustion with very low emissions.
- In order to avoid any spillage of condensate via the terminal, the horizontal
flue gas exhaust ducts must be installed with a sufficient degree of slope
towards the boiler: 3° of slope = 5 mm per metre of duct.
- There must be no obstructions or inlets to other appliances within a radius
of 0.5 meters around the terminal of the .
            
. You can calculate this value using the following table:
(please see sample calculation).

The diagram below consists of the following parts: pipe with a measuring point
+ 5 metres of vertical pipe + two 45° pipe bends + 1 metre of inclined pipe +
one vertical terminal.
The resistance of this system is as follows:

          


Concentric pipe Separate air inlet Separate flue gas exhaust
HM 25 C
Ø 80/125 mm
HM 25 C
Ø 80 mm
HM 25 C
Ø 80 mm
Straight pipe 1 m 5.0 1.5 2.0
Pipe with measuring point 2.5 — 1.0
90° bend 6.0 1.9 3.4
45° bend 4.0 1.3 2.3
Vertical terminal 20.0 — —
Horizontal terminal 15.0 — —
This table is based on ACV equipment and cannot be applied generally.
4000 mm
1000 mm
1000 mm
10800220
HeatMaster® 25 C vent kit
assembly

 664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N

 : Connection with an individual system of which the exhaust duct for
the combustion products is installed in an exhaust pipe that is part
of the building. The appliance, the exhaust duct and the terminal
units are certified as an inextricable assembly.
 : Connection by two ducts to a collective duct system serving more
than one appliance; this system of collective ducts features two
ducts connected to a terminal unit that simultaneously intakes
fresh combustion air and discharges the combustion products
outside through openings that are either concentric or close enough
together to be subjected to similar wind conditions.
 : Connection to separate ducts for the supply of combustion air and
for venting the combustion products; these ducts may end in zones
with different pressure levels.
 : Type C boiler which is intended for connection to a room sealed flue
system which is approved and sold separately.
().
 : Connection to an exhaust duct venting the combustion products
outside of the installation area, with the combustion air being drawn
directly from this area.
 : Connection to an exhaust system of the combustion products
designed to operate with positive pressure.
 : Connection by pipes with horizontal terminals that simultaneously
take in combustion air for the burner and discharge combustion
products outside through openings that are either concentric or
close enough together to be subjected to similar wind conditions.
 : Connection by pipes with vertical terminals that simultaneously
take in fresh air for the burner and discharge the combustion
products outside through openings that are either concentric or
close enough together to be subjected to similar wind conditions.
C13C93
C53
C43
C43
B23
B23P C33
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
bar
2
1
O
3
4
B23P C43 C33 C53
B23 C43 C93 C13


664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N
GAS CONNECTION
-   boilers are equipped with a Ø 3/4”M connection
to connect a gas isolator.
- The gas connections must comply with all applicable standards
(in Belgium: ).
- If there is a risk of dirt stemming from the gas network, place a gas filter
upstream of the connection.
- Purge the gas pipe and carefully check that there are no leaks on
the boiler’s internal and external pipes.
- Check the system’s gas pressure. Please refer to the technical data table.
- Check the gas pressure and consumption when commissioning
the appliance.
DOMESTIC HOT WATER CONNECTION
         

The  can be connected directly to the DHW circuit.
Flush the system before connecting the DHW circuit.
The system must be equipped with an approved safety unit including a 7 bar
safety valve, a non-return valve and a stop valve.
During the heating process, the domestic water expands and the pressure
increases. As soon as the pressure exceeds the safety valve setting, the valve
opens and discharges. The use of a DHW expansion tank (minimum 2 litres)
will avoid a discharge of water and reduce water hammer.
        

       


           

 
1. Domestic cold water isolation valve
2. Non-return valve
3. Pressure reducer
4. Safety valve
5. DHW expansion vessel
6. DHW temperature control valve
7. Hot water tap
5
12 3
4
67
DANGER
HOT

 664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N
CENTRAL HEATING CONNECTIONS

         

- The whole central heating system must be thoroughly flushed with clean
water before being connected to the appliance.
- The central heating safety valve is integrated and located in the appliance.
It must be connected to the drain with an air gap (allowing an inspection).
- The consists of a 12 litre primary expansion cylinder.
- A de-stratification pump is built into the appliance. This pump must
operate in DHW mode as well as in heating mode. The 3-way switch must
be set to speed 3.
- Fill the system with fresh tap water. Contact your ACV representative or
installer about the use of inhibitors.
  
 

- There is a connection and valve for filling and/or draining the appliance at
the bottom of the unit behind the front panel.
Fill the appliance to the minimum pressure of one bar. Purge the entire
installation and refill the appliance to 1.5 bar.
- Ensure that the condensate trap is fitted and connect the hose to the
drain using a connection that can be inspected. If necessary fill the trap
with clean water. Take the necessary precautions to prevent any risk of the
condensate freezing.
        

             
          



1. Isolating valve in the heating circuit
2. Safety valve calibrated to 3 bar, with pressure gauge
3. System filling valve
4. Expansion vessel
5. Drain down valve
6. Condensate discharge
7. Heating pump
3
4
1
1
7
5
2
6


664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N
INSTALLATION OF A SINGLE HEATING
CIRCUIT REGULATED BY AN ACV 22 ROOM
THERMOSTAT

The heating system is controlled by an room thermostat.
In this configuration, the boiler constantly adapts its operation (minimum
temperature =60C) to the outdoor temperature, if an outside temperature
sensor is connected.
The circulator is triggered as soon as the room thermostat generates a heat
demand.
Advantages for the user:
- Comfort
- Maximum output
- Simplicity of the system
$)
$&9
Before the boiler’s start up, an “” is necessary so that the boiler
detects the DHW sensor.
To do this, turn the right button to “” then start up the boiler by
pressing on the  switch.
From the time that the display shows “” the “” button can be
released.
A. - Heating temperature setting guidelines without external sensor
- Maximum heating temperature limit with external sensor
- The thermostat is positioned on , the heating circuit is deactivated
and the boiler is then in summer mode.
B. - Domestic hot water temperature setting.
Optional equipment
Code Description
10800018 ACV 22 Room thermostat
10510100 Outside temperature sensor, 12kΩ — AF120
10510900 Safety thermostat RAM 5109:
Mandatory to protect all oor heating circuits.
A B

 664Y4500 • D
ENFRRU PL DE IT ES NL
I N sta l l at Io N
Factory Description
6Selection of the heating curve
20 Minimum temperature of the
heating outlet
10
T plus = temperature increase of
primary ow during domestic hot
water mode
00= domestic hot water priority mode
1= in parallel


Only for low
temperature
heating circuits
10
P2 = 20
30
40
50
60
70
80
90
-25-20-15-10-505101520
P1 = 10
P1 = 5
P1 = 4
P1 = 3
P1 = 2
P1 = 1
P1 = 6
P1 = 7
P1 = 8P1 = 9



BUS A
BUS B
W
910 11 12 13 14 15 16 17 18 19 20


664Y4500 • D
ENFRRU PL DE IT ES NL
Room Unit
AF120
Before the boiler’s start up, an “” is necessary so that the boiler
detects the DHW sensor.
To do this, turn the right button to “” then start up the boiler by
pressing on the  switch.
From the time that the display shows “” the “” button can be
released.

I N sta l l at Io N
INSTALLING A SINGLE HEATING CIRCUIT
WITH ROOM UNIT REGULATION

A Room Unit thermostat controls the heating. The latter enables a choice
between different heating functions and authorises up to 3 daily programmes
for heating and for domestic hot water. The Room Unit thermostat has the
advantage of displaying information on system status.
In this configuration, the boiler constantly adapts its operation (minimum
temperature =60C) to the outdoor temperature.
A. - Heating temperature setting guidelines without external sensor
- Maximum heating temperature limit with external sensor
- The thermostat is positioned on , the heating circuit is deactivated
and the boiler is then in summer mode.
B. - Domestic hot water temperature setting.
 

Optional equipment
Code Description
10800189 RSC Room Unit:
Supplied with external probe
10510100 Outside temperature sensor, 12kΩ — AF120
10510900 Safety thermostat RAM 5109:
Mandatory to protect all oor heating circuits.
10800201 Interface Clip-in ESYS:
Authorises communication between the boiler and the RSC Room Unit.
A B