Vaillant ecoTEC exclusive User manual

Installation and maintenance instructions
ecoTEC exclusive
VCW 266/5‑7 (N-DE)
DE
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone]‑0 Fax [phone]‑2810
[email protected] www.vaillant.de

Contents
2Installation and maintenance instructions ecoTEC exclusive 0020189875_01
Contents
1 Safety .................................................................... 3
1.1 Action-related warnings ......................................... 3
1.2 Intended use .......................................................... 3
1.3 General safety information .................................... 3
1.4 Regulations (directives, laws, standards) .............. 5
2 Notes on the documentation .............................. 6
2.1 Observing other applicable documents ................. 6
2.2 Storing documents................................................. 6
2.3 Validity of the instructions...................................... 6
3 Product description............................................. 6
3.1 Product design....................................................... 6
3.2 Information on the identification plate.................... 6
3.3 CE label ................................................................. 6
3.4 DVGW mark........................................................... 7
4 Set-up.................................................................... 7
4.1 Unpacking the product........................................... 7
4.2 Checking the scope of delivery.............................. 7
4.3 Dimensions ............................................................ 7
4.4 Minimum clearances.............................................. 8
4.5 Using the installation template............................... 8
4.6 Wall-mounting the product..................................... 8
4.7 Removing the front casing..................................... 9
4.8 Removing the side section .................................... 9
5 Installation............................................................ 9
5.1 Installation requirements ..................................... 10
5.2 Installing the gas connection ............................... 11
5.3 Checking the gas line for leak-tightness.............. 11
5.4 Installing the domestic hot and cold water
connection ........................................................... 11
5.5 Connecting the heating flow and heating
return ................................................................... 11
5.6 Connecting the condensate discharge pipe ........ 11
5.7 Installing the discharge pipe on the expansion
relief valve............................................................ 11
5.8 Flue installation.................................................... 12
5.9 Electrical installation ............................................ 12
6 Operation............................................................ 14
6.1 Operating concept ............................................... 14
6.2 Calling up the installer level................................. 14
6.3 Live Monitor (status codes) ................................. 15
6.4 Setting the hot water temperature ....................... 15
7 Start-up ............................................................... 15
7.1 Switching the product on/off ................................ 15
7.2 Running the installation assistants ...................... 15
7.3 Restarting the installation assistants ................... 16
7.4 Test programmes................................................. 16
7.5 Using check programmes.................................... 16
7.6 Checking and treating the heating water/filling
and supplementary water .................................... 17
7.7 Preventing low water pressure ............................ 18
7.8 Filling the heating installation .............................. 18
7.9 Purging the heating installation ........................... 18
7.10 Filling and purging the hot water system ............. 18
7.11 Filling the condensate siphon .............................. 18
7.12 Starting up the heat generator............................. 19
7.13 Gas inspection ..................................................... 19
7.14 Checking leak-tightness ...................................... 20
8 Adapting the unit to the heating
installation.......................................................... 20
8.1 Calling up diagnostics codes ............................... 20
8.2 Burner anti-cycling time ....................................... 20
8.3 Setting the maintenance interval ......................... 21
8.4 Setting the hydraulic operating mode .................. 21
8.5 Hydraulic check ................................................... 22
8.6 Setting solar drinking water post-heating ............ 22
8.7 Handing the product over to the end user ........... 22
9 Troubleshooting ................................................ 22
9.1 Comfort protection mode for the heat cell ........... 22
9.2 Checking service messages................................ 22
9.3 Eliminating faults.................................................. 23
9.4 Calling up/clearing the fault memory ................... 23
9.5 Resetting parameters to factory settings ............. 23
9.6 Preparing the repair work .................................... 23
9.7 Replacing defective components......................... 23
9.8 Completing repair work........................................ 26
9.9 Checking the product for leak-tightness .............. 26
10 Inspection and maintenance ............................ 26
10.1 Function menu ..................................................... 26
10.2 Electronics self-test.............................................. 26
10.3 Working on the compact thermal module ............ 27
10.4 Cleaning the condensate siphon ......................... 28
10.5 Cleaning the strainer in the cold water inlet......... 28
10.6 Draining the product ............................................ 29
10.7 Checking the pre-charge pressure for the
internal expansion vessel .................................... 29
10.8 Completing inspection and maintenance work .... 29
10.9 Checking the product for leak-tightness .............. 29
11 Decommissioning.............................................. 29
11.1 Temporarily decommissioning the product.......... 29
11.2 Decommissioning the product ............................. 29
12 Recycling and disposal..................................... 29
13 Customer service............................................... 29
Appendix ............................................................................ 30
A Pipe lengths in the B23P installation............... 30
B Installer level –Overview .................................. 30
C Overview of diagnostics codes........................ 33
D Status codes –Overview .................................. 38
E Overview of fault codes .................................... 39
F Wiring diagram 12 - 35 kW................................ 43
G Inspection and maintenance work –
Overview............................................................. 44
H Technical data.................................................... 45
Index ................................................................................... 49

Safety 1
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 3
1 Safety
1.1 Action-related warnings
Classification of action-related warnings
The action-related warnings are classified in
accordance with the severity of the possible
danger using the following warning signs and
signal words:
Warning symbols and signal words
Danger!
Imminent danger to life or risk of
severe personal injury
Danger!
Risk of death from electric shock
Warning.
Risk of minor personal injury
Caution.
Risk of material or environmental
damage
1.2 Intended use
There is a risk of injury or death to the user or
others, or of damage to the product and other
property in the event of improper use or use
for which it is not intended.
The product is intended as a heat generator
for closed heating installations and for hot
water generation.
Depending on the gas-fired boiler type, the
products referred to in these instructions
must only be installed and operated in con-
junction with the air/flue pipe accessories lis-
ted in the other applicable documents.
Intended use includes the following:
–observance of accompanying operating,
installation and servicing instructions for
the product and any other system compon-
ents
–installing and fitting the product in accord-
ance with the product and system approval
–compliance with all inspection and main-
tenance conditions listed in the instruc-
tions.
Intended use also covers installation in ac-
cordance with the IP code.
Any other use that is not specified in these
instructions, or use beyond that specified in
this document shall be considered improper
use. Any direct commercial or industrial use
is also deemed to be improper.
Caution.
Improper use of any kind is prohibited.
1.3 General safety information
1.3.1 Risk caused by inadequate
qualifications
The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:
–Set-up
–Dismantling
–Installation
–Start-up
–Inspection and maintenance
–Repair
–Decommissioning
▶Observe all instructions that are included
with the product.
▶Proceed in accordance with current tech-
nology.
▶Observe all applicable directives, stand-
ards, laws and other regulations.
1.3.2 Risk of death from escaping gas
What to do if you smell gas in the building:
▶Avoid rooms that smell of gas.
▶If possible, open doors and windows fully
and ensure adequate ventilation.
▶Do not use naked flames (e.g. lighters,
matches).
▶Do not smoke.
▶Do not use any electrical switches, mains
plugs, doorbells, telephones or other com-
munication systems in the building.
▶Close the emergency control valve or the
main isolator.
▶If possible, close the gas isolator cock on
the product.
▶Warn other occupants in the building by
yelling or banging on doors or walls.
▶Leave the building immediately and ensure
that others do not enter the building.
▶Alert the police and fire brigade as soon as
you are outside the building.

1 Safety
4Installation and maintenance instructions ecoTEC exclusive 0020189875_01
▶Use a telephone outside the building to
inform the emergency service department
of the gas supply company.
1.3.3 Risk of death from leaks if the
product is installed below ground
level
Liquid gas accumulates at floor level. If the
product is installed below ground level, liquid
gas may accumulate at floor level if there
are any leaks. In this case, there is a risk of
explosion.
▶Make sure that liquid gas cannot escape
from the product or the gas line under any
circumstance.
1.3.4 Risk of death due to blocked or
leaking flue gas routes
Installation errors, damage, tampering, unau-
thorised installation sites or similar can cause
flue gas to escape and result in a risk of pois-
oning.
What to do if you smell flue gas in the prop-
erty:
▶Open all accessible doors and windows
fully to provide ventilation.
▶Switch off the product.
▶Check the flue gas routes in the product
and the flue gas diversions.
1.3.5 Risk of poisoning and burns caused
by escaping hot flue gases
▶Only operate the product if the air/flue pipe
has been completely installed.
▶With the exception of short periods for
testing purposes, only operate the product
when the front casing is installed and
closed.
1.3.6 Risk of death due to explosive and
flammable materials
▶Do not use the product in storage rooms
that contain explosive or flammable sub-
stances (such as petrol, paper or paint).
1.3.7 Risk of death due to cabinet-type
casing
Cabinet-type casing can give rise to danger-
ous situations when used on a product which
is operated with an open flue.
▶Ensure that the product is supplied with
sufficient combustion air.
1.3.8 Risk of poisoning caused by
insufficient combustion air supply
Conditions: Open-flued operation
▶Ensure that the air supply to the product's
installation room is permanently unobstruc-
ted and sufficient in accordance with the
relevant ventilation requirements.
1.3.9 Risk of death due to lack of safety
devices
The schematic drawings included in this doc-
ument do not show all safety devices re-
quired for correct installation.
▶Install the necessary safety devices in the
system.
▶Observe the applicable national and inter-
national laws, standards and guidelines.
1.3.10 Risk of death from electric shock
There is a risk of death from electric shock if
you touch live components.
Before commencing work on the product:
▶Unplug the mains plug.
▶Or disconnect the product from the power
supply by switching off all power supplies
(electrical partition with a contact gap of at
least 3 mm, e.g. fuse or circuit breaker).
▶Secure against being switched back on
again.
▶Wait for at least 3 minutes until the capa-
citors have discharged.
▶Check that there is no voltage.
1.3.11 Risk of being burned or scalded by
hot components
▶Only carry out work on these components
once they have cooled down.
1.3.12 Risk of death from escaping flue
gas
If you operate the product with an empty con-
densate siphon, flue gas may escape into the
room air.
▶In order to operate the product, ensure that
the condensate siphon is always full.

Safety 1
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 5
Conditions: Permitted B23 or B23P unit
types with condensate siphon (third-party
accessory)
–Water seal level: ≥200 mm
1.3.13 Risk of material damage caused by
using an unsuitable tool
▶Use the correct tool to tighten or loosen
threaded connections.
1.3.14 Risk of material damage caused by
frost
▶Do not install the product in rooms prone
to frost.
1.3.15 Risk of corrosion damage due to
unsuitable combustion and room
air
Sprays, solvents, chlorinated cleaning
agents, paint, adhesives, ammonia com-
pounds, dust or similar substances may lead
to corrosion on the product and in the flue
system.
▶Ensure that the supply of combustion air is
always free of fluorine, chlorine, sulphur,
dust, etc.
▶Ensure that no chemical substances are
stored at the installation site.
▶If you are installing the product in
hairdressing salons, painter's or joiner's
workshops, cleaning businesses or similar
locations, choose a separate installation
room in which the room air is technically
free of chemical substances.
▶Ensure that the combustion air is not
routed through chimneys which have
previously been used with floor-standing
oil-fired boilers, or with other boilers,
which could cause soot to build up in the
chimney.
1.3.16 Risk of damage to the flexible gas
pipe
The corrugated gas pipe may become dam-
aged if weight is placed on it.
▶Do not suspend the compact thermal
module on the flexible gas pipe, for
example during maintenance work.
1.4 Regulations (directives, laws,
standards)
▶Observe the national regulations, stand-
ards, guidelines and laws.

2 Notes on the documentation
6Installation and maintenance instructions ecoTEC exclusive 0020189875_01
2 Notes on the documentation
2.1 Observing other applicable documents
▶You must observe all the operating and installation in-
structions included with the system components.
2.2 Storing documents
▶Pass these instructions and all other applicable docu-
ments on to the system operator.
2.3 Validity of the instructions
These instructions apply only to:
–VCW 266/5-7 (N-DE) ecoTEC exclusive: 0010017094
3 Product description
3.1 Product design
1 2
3
4
5
6
7
8
9
10
111213
15
16
17
18
19
20
21
22
14
1 Flue gas test point
2 Connection for the
air/flue pipe
3 All-gas sensor
4 Expansion vessel
5 Water hammer arrester
6 Fan
7 Secondary heat ex-
changer
8 Automatic air vent
9 Manometer
10 Expansion relief valve
11 High-efficiency pump
12 Prioritising diverter
valve
13 Differential pressure
sensor
14 Communication unit
(optional)
15 Electronics box
16 Gas valve assembly
17 Compact thermal
module
18 Heat exchanger
19 Ignition electrode
20 Air intake pipe
21 Volume flow sensor
22 Water pressure sensor
3.2 Information on the identification plate
The identification plate is mounted on the underside of the
product in the factory.
Information on the
identification plate
Meaning
Read the instructions.
VC(W) ... Type designation
..6/5-7 Calorific value power/product generation
equipment
ecoTEC exclusive Product designation
2N, G20 –G25
20 mbar (2 kPa)
Gas group and gas connection pressure
as set at the factory
ww/yyyy Date of manufacture: Week/year
Cat. Approved unit categories
Types Approved gas-fired units
PMS Permissible total overpressure
Tmax. Max. flow temperature
ED 92/42 Current efficiency directive fulfilled with
4* rating
V Hz Mains voltage and mains frequency
W Max. electrical power consumption
IP Level of protection
Heating mode
Hot water generation
P Nominal heat output range
Q Heat input range
Bar code with serial number,
7th to 16th digit = product article number
3.3 CE label
The CE label shows that the products comply with the basic
requirements of the applicable directives as stated on the
identification plate.
The declaration of conformity can be viewed at the manufac-
turer's site.

Set-up 4
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 7
3.4 DVGW mark
The DVGW mark documents that the products comply with
all of the requirements of the DVGW VP 112 (test basis from
the German Association for Gas and Water Industry Asso-
ciation for granting the DVGW quality mark) in accordance
with the identification plate.
4 Set-up
4.1 Unpacking the product
1. Remove the product from its box.
2. Remove the protective film from all parts of the product.
4.2 Checking the scope of delivery
▶Check that the scope of delivery is complete and intact.
Number Designation
1Product bracket
1 Enclosed items for securing the product
1Heat generator
1Condensate discharge hose
1 Expansion relief valve connection pipe
1 Gas family coding resistor
1Mounting template
1 Noise insulation
1Enclosed documentation
1Bag with small parts
4.3 Dimensions
62020
720
A
B125
180
130
440
188
160
100100
3535
12
1
3 4 5
3
5
6
7
11
4
6
910
2
78
1 Flue pipe wall duct
2 Product holder
3 Heating flow
4 Hot water connection
5 Gas connection
6 Cold water connection
7 Heating return
8 Connection for the
heating expansion relief
valve drain line
9 Condensate discharge
connection
10 Condensate siphon
11 R1 tundish/condensate
siphon connection
12 Flue pipe connection
Consult the installation template that is supplied to find the
dimension A.

4 Set-up
8Installation and maintenance instructions ecoTEC exclusive 0020189875_01
The product's installation depth B can be found in the tech-
nical data in the appendix.
4.4 Minimum clearances
B A
C C D
Minimum clearance
A 165 mm: Air/flue pipe, 60/100 mm diameter
275 mm: Air/flue pipe, 80/125 mm diameter
B 180 mm; optimum approx. 250 mm
C 5 mm; optimum approx. 50 mm
D 500 mm in front of the heat generator to enable
easy access for maintenance work (may be
provided by an opening door).
4.5 Using the installation template
▶Use the installation template to ascertain the locations at
which you need to drill holes and make perforations.
4.6 Wall-mounting the product
1. Check whether the wall has sufficient load-bearing ca-
pacity to bear the operational weight of the product.
2. Check if the supplied fixing material may be used for
the wall.
Conditions: The load-bearing capacity of the wall is sufficient, The fixing
material may be used for the wall
▶Wall-mount the product as described.
Conditions: The load-bearing capacity of the wall is not sufficient
▶Ensure that wall-mounting apparatus on-site has a suf-
ficient load-bearing capacity. Use individual stands or
primary walling, for example.
▶Do not wall-mount the product if you cannot provide
wall-mounting apparatus with a sufficient load-bearing
capacity.
Conditions: The fixing material may not be used for the wall
▶Wall-mount the product as described in the illustration
using the permitted fixing material provided on-site.

Installation 5
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 9
4.7 Removing the front casing
B
A
B
▶Remove the front casing as shown in the illustration.
4.8 Removing the side section
A
C
D
2x
B
Caution.
Risk of material damage caused by mech-
anical deformation.
Removing both side sections may cause
mechanical distortion in the product, which
may cause damage to the piping, for ex-
ample, and potentially result in leaks.
▶Depressurise the product on the water
side.
▶Always remove only one side section –
never both side sections at the same time.
▶Remove the side section as shown in the illustration.
5 Installation
Danger!
Risk of scalding and/or risk of material
damage due to incorrect installation lead-
ing to escaping water.
Stresses in supply lines can cause leaks.
▶Install the supply lines without tension.
Caution.
Risk of material damage due to the gas
leak-tightness test.
At a test pressure of >11 kPa (110 mbar), gas
leak-tightness tests may cause damage to
the gas valve.

5 Installation
10 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
▶If, during gas leak-tightness tests, you
also place the gas lines and the gas valve
in the product under pressure, use a max.
test pressure of 11 kPa (110 mbar).
▶If you cannot limit the test pressure to
11 kPa (110 mbar), close any gas isolator
cocks that are installed upstream from the
product before you carry out the gas leak-
tightness test.
▶If, during gas leak-tightness tests, you
have closed the gas isolator cock that is
installed upstream of the product, relieve
the gas line pressure before you open this
gas isolator cock.
Caution.
Risk of material damage caused by corro-
sion
Due to non-diffusion-tight plastic pipes in the
heating installation, air gets into the heating
water. Air in the heating water causes corro-
sion in the heat generator circuit and in the
product.
▶If you use non-diffusion-tight plastic pipes
in the heating installation, ensure that no
air gets into the heat generator circuit.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
▶Only solder connectors if the connectors
are not yet screwed to the service valves.
If you also want to install an external heating pump without
a low loss header, install the external pump in the return and
connect it via the auxiliary relay.
5.1 Installation requirements
5.1.1 Information on liquefied petroleum gas
operation
In the as-delivered condition, the product is preset for opera-
tion with the gas group indicated on the data plate.
If you have a product that is preset for operation with natural
gas, you must replace the gas family coding resistor with the
enclosed coding resistor for liquefied petroleum gas during
the installation. During start-up, the product must be con-
verted for operation with liquefied petroleum gas in the in-
stallation assistant. You do not require a conversion set, be-
cause the product has a gas-adaptive heat cell, which is set
independently to the relevant gas type within the gas family.
The gas type can also be changed at a later point using dia-
gnostics code D.087.
If you have selected the "liquid gas" gas type, after the start-
up process is complete, affix the enclosed "Liquid gas" con-
version sticker onto the data plate and affix the enclosed
tank sticker (propane quality) so that it is clearly visible on
the tank or the cylinder cabinet, if possible close to the filler
nozzle.
5.1.2 Purging the liquid gas tank
If the liquid gas tank is not purged properly, this may result in
ignition problems.
▶Ensure that the liquid gas tank has been purged properly
before installing the product.
▶If required, contact the filler or the liquid gas supplier.
5.1.3 Using the correct type of gas
Using the incorrect type of gas may cause fault shutdowns in
the product. Ignition and combustion noise may occur in the
product.
▶Only use the gas type listed on the data plate.
5.1.4 Information and specifications for installing
the B23P
Pipe lengths in the B23P installation (→Page 30)
The flue gas system must at least correspond to the classi-
fication T 120 P1 W 1 in accordance with EN 1443.
The maximum pipe length (straight pipe only) corresponds to
the maximum permitted flue gas pipe length without any el-
bows. If elbows are used, the maximum pipe length must be
reduced in accordance with the dynamic flow characteristics
of the elbows. Elbows must not be connected directly after
one another as this method dramatically increases pressure
losses.
In particular, if the flue pipe is installed in cold rooms or out-
side of the building, the freezing point on the surface of the
inside of the pipe may be reached. A proven design in ac-
cordance with EN 13384-1 for a maximum boiler load at a
flue gas temperature of 40 °C must be used to prevent this
problem. The product must not be connected to a cascade
flue gas system that is being used by other units.
▶Observe the applicable international, national and local
regulations for flue gas systems, in particular for installa-
tions in living rooms. Inform the operator how to correctly
operate the product.
5.1.5 Required preliminary work
1. Install a stop cock in the gas line.
2. Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
3. Check that the volumetric capacity of the expansion
vessel is sufficient for the system volume.
Conditions: The volume of the installed expansion vessel is insufficient
▶Install an additional expansion vessel, connected as
close to the product as possible, in the heating return.
Conditions: External expansion vessel installed
▶Install a non-return valve in the product outlet (heating
flow) or decommission the internal expansion vessel
in order to prevent the warm start function from being
increasingly activated due to backflow.
4. Install a tundish with siphon for the condensate dis-
charge and the exhaust pipe on the expansion relief
valve. Lay as short a drain line as possible, at a down-
ward gradient away from the tundish.

Installation 5
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 11
5. Insulate bare pipes exposed to environmental influ-
ences to protect them from frost using suitable insu-
lating material.
5.2 Installing the gas connection
1
1. Install the gas pipe in accordance with the recognised
rules of technology.
2. Connect the product to the gas pipe in accordance with
the recognised rules of technology.
3. Remove the residues from the gas pipe by blowing
through the gas pipe beforehand.
4. Purge the gas pipe before start-up.
5.3 Checking the gas line for leak-tightness
▶Check the entire gas line properly for leak-tightness.
5.4 Installing the domestic hot and cold water
connection
1
2
▶Make the water connections (cold water connection (1)
and domestic hot water connection (2)) in accordance
with the relevant standards.
5.5 Connecting the heating flow and heating
return
1
▶Establish the heating connections (1) in accordance with
the relevant standards.
5.6 Connecting the condensate discharge pipe
Danger!
Risk of death from escaping flue gases!
The siphon's condensate drain pipework
must not be connected to waste-water piping
because, otherwise, the internal condensate
siphon may be drained fully and flue gas may
escape.
▶Do not connect the condensate drain
pipework tightly to the waste-water pip-
ing.
min. 180
2
1
▶Fit the condensate discharge pipe (1) onto the condens-
ate siphon.
▶If you have to extend the condensate discharge pipe,
only use pipes that are made of acid-resistant material
(e.g. plastic).
▶Leave an installation space of at least 180 mm beneath
the condensate siphon.
▶Suspend the condensate drain pipework (1) above the
pre-installed tundish (2).
5.7 Installing the discharge pipe on the
expansion relief valve
1. Install the discharge pipe for the expansion relief valve
so that it does not interfere with the removal and fitting
of the lower section of the siphon.

5 Installation
12 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
1
2. Install the discharge pipe as shown (do not shorten).
3. Make sure that the end of the pipe is visible.
4. Ensure that discharged water or steam cannot cause
injury to persons or damage to electronic components.
5.8 Flue installation
5.8.1 Installing and connecting the flue pipe
1. You can find out which flue pipes may be used by con-
sulting the enclosed flue pipe installation manual.
Conditions: Installation in damp rooms
▶You must connect the product to a room-sealed air/flue
gas installation. The combustion air must not be taken
from the installation room.
Caution.
Risk of poisoning due to escaping flue
gas.
Mineral-oil-based greases can damage the
seals.
▶Instead of grease, use only water or com-
mercially available soft soap to aid install-
ation.
2. Install the flue pipe using the installation manual.
5.8.2 Replacing the connection piece for the
air/flue pipe as required
1. Replace the connection piece for the air/flue pipe as
required. The product-specific standard equipment is
listed under Technical Data in the appendix.
2. Remove the connection piece for the air/flue pipe.
(→Page 12)
3. Alternatives
▶If required, install the connection piece for the
separate air/flue gas ducting, 80/80 mm diameter.
(→Page 12)
5.8.2.1 Removing the connection piece for the
air/flue pipe
A
B
C
1. Insert a screwdriver into the slot between the measuring
stub pipes.
2. Press the screwdriver carefully down.
3. Turn the connection piece anticlockwise as far as it will
go and then remove it by pulling it upwards.
5.8.2.2 Installing the connection piece for the
separate air/flue gas ducting, 80/80 mm
diameter
1. Remove the connection piece for the air/flue pipe.
(→Page 12)
120 mm 120 mm
2. Insert the alternative connection piece. The connection
for the air supply can point to the left- or the right-hand
side. In doing so, pay attention to the latching lugs.
3. Turn the connection piece clockwise until it clicks into
position.
5.9 Electrical installation
Only qualified electricians may carry out the electrical install-
ation.
Danger!
Risk of death from electric shock!
Mains connection terminals L and N remain
live even if the on/off switch is turned off.
▶Switch off the power supply.
▶Secure the power supply against being
switched on again.

Installation 5
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 13
5.9.1 Opening the electronics box
A
B
▶Open the electronics box as shown in the illustration.
5.9.2 Carrying out the wiring
Caution.
Risk of material damage caused by incor-
rect installation.
Mains voltage at incorrect terminals and plug
terminals may destroy the electronics.
▶Do not connect any mains voltage to the
eBUS terminals (+/-).
▶Only connect the mains connection cable
to the terminals marked for the purpose.
1. Route the supply lines of the components to be connec-
ted through the cable duct provided on the underside of
the product on the left.
2. Use strain reliefs.
3. Shorten the supply lines as necessary.
30 mm max.
4. To prevent short circuits if a strand accidentally comes
loose, only strip the outer sheathing of flexible lines to a
maximum of 30 mm.
5. Ensure the inner conductor insulation is not damaged
when stripping the outer sheathing.
6. Only strip inner conductors just enough to establish
good, sound connections.
7. To avoid short circuits resulting from loose individual
wires, fit conductor end sleeves on the stripped ends of
the conductors.
8. Screw the respective plug to the supply line.
9. Check whether all conductors are sitting mechanically
securely in the terminals of the plug. Remedy this if
necessary.
10. Plug the plug into the associated PCB slot; see the
connection diagram in the appendix.
5.9.3 Establishing the power supply
Caution.
Risk of material damage due to high con-
nected voltage.
At mains voltages greater than 253 V, elec-
tronic components may be damaged.
▶Make sure that the rated voltage of the
mains is 230 V.
1. Plug the mains plug into a suitable plug socket.
2. Make sure that access to the mains connection is al-
ways available and is not covered or blocked.
5.9.4 Installing the product in a wet room
Danger!
Risk of death from electric shock!
If you install the product in a room with high
levels of moisture, e.g. a bathroom, observe
the nationally recognised technical standards
for electrical installations. If you use the fact-
ory-installed connection cable, if installed,
with an earthed plug, there is a risk of death
from electric shock.
▶Never use the factory-installed connection
cable with earthed plug when installing the
product in a moist environment.
▶Connect the product using a fixed connec-
tion and an electrical partition with a con-
tact opening of at least 3 mm (e.g. fuses
or power switches).
▶Use a flexible line for the mains connec-
tion line, which is routed through the cable
duct into the product.
1. Open the electronics box. (→Page 13)
2. Detach the ProE plug from the PCB slot for the power
supply (X1).
3. Unscrew the ProE plug for the factory-installed power
supply cable, if installed.
4. Instead of the factory-installed power supply cable, if
installed, use a suitable three-core power supply cable
which complies with the relevant standards.
5. Carry out the wiring. (→Page 13)
6. Close the electronics box.
7. Observe the flue-gas connection that is required on a
room-sealed air/flue system. (→Page 12)
5.9.5 Connecting controls to the electronics
1. Install the control if necessary.
2. Open the electronics box. (→Page 13)
3. Connect the wiring in accordance with the wiring dia-
gram that is included in the appendix.
Conditions: Connecting a weather-compensated control or room temperat-
ure control via eBUS
▶Connect the control to the eBUS connection.

6 Operation
14 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
▶Bridge the 24 V = RT connection (X100 or X106), if there
is not already a bridge.
Conditions: Connecting a low-voltage control (24 V)
▶Remove the bridge and connect the control to the
24 V = RT connection (X100 or X106).
Conditions: Connecting a limit thermostat to underfloor heating
▶Remove the bridge and connect the limit thermostat to
the "Burner off" connection.
4. Close the electronics box.
5. For multi-circuit controls, change D.018 from Eco (in-
termittently operating pump) to Comfort (continuously
operating pump), see section "Adapting to the heating
installation".
5.9.6 Replacing the gas family coding resistor, if
required
1. Open the electronics box. (→Page 13)
X31
X12
1
2. Remove the gas family coding resistor (1) (plug X24)
(factory setting: natural gas = yellow) and plug in the
coding resistor from the bag of small parts (liquefied
petroleum gas = grey).
3. Close the electronics box.
4. When starting up in the installation assistant or retro-
actively via diagnostics code D.087, set the correct gas
type.
5.9.7 Connecting the communication unit
The product can be connected to the Internet.
▶Connect the communication unit in accordance with the
installation instructions enclosed with the communication
unit.
5.9.8 Connecting additional components
You can actuate an additional component with the aid of the
auxiliary relay that is installed, and you can actuate two other
components with the multi-functional module.
5.9.8.1 Using the auxiliary relay
1. Connect an additional component directly to the integ-
rated auxiliary relay using the grey plug on the PCB.
2. Carry out the wiring.
3. Activate the component via D.026, see section "Adapt-
ing to the heating installation".
5.9.8.2 Using the VR 40 ("2 in 7" multi-functional
module)
1. Install the components in accordance with the respect-
ive instructions.
Conditions: Components connected to relay 1
▶Activate D.027, see section "Adapting to the heating
installation".
Conditions: Components connected to relay 2
▶Activate D.028, see section "Adapting to the heating
installation".
5.9.9 Connecting the circulation pump and
actuating it according to requirements
1. Carry out the wiring. (→Page 13)
2. Connect the 230 V connection cable to the plug from
slot X13 and plug it into the slot.
3. Connect the connection cable for the external button
using terminals 1 (0) and 6 (functional drawing) on
the X41 edge connector, which is supplied with the con-
trol.
4. Plug the edge connector into the PCB slot X41.
6 Operation
6.1 Operating concept
The operating concept and the read-off and setting facilities
of the operator level are described in the operating instruc-
tions.
An overview of the reading and setting options for the in-
staller level is included in the table in the appendix.
Installer level –Overview (→Page 30)
6.2 Calling up the installer level
1. Only call up the installer level if you are a competent
person.
2. Press and at the same time.
3. Navigate to Menu →Installer level and confirm by
pressing .
4. Set the value 17 (code) and confirm by pressing .

Start-up 7
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 15
6.3 Live Monitor (status codes)
Menu →Live monitor
Status codes in the display provide information on the pro-
duct's current operating status.
Status codes –Overview (→Page 38)
6.4 Setting the hot water temperature
Danger!
Risk of death from legionella.
Legionella multiply at temperatures below
60 °C.
▶Ensure that the end user is familiar with
all of the Anti-legionella measures in order
to comply with the applicable regulations
regarding legionella prevention.
Conditions: Water hardness: > 3.57 mol/m³
▶Set the hot water temperature to a maximum of 50 °C.
7 Start-up
7.1 Switching the product on/off
▶Press the on/off button on the product.
◁The basic display appears on the display.
7.2 Running the installation assistants
The installation assistant is displayed whenever the product
is switched on until it has been successfully completed.
It provides direct access to the most important check
programmes and configuration settings for starting up the
product.
To recheck and reset the most important system parameters,
call up the Appliance config..
Menu →Installer level →Appliance config.
The settings options for more complex systems can be found
in the Diagnostics menu.
Menu →Installer level →Diagnostics menu
▶Press to confirm the start of the installation assistant.
◁All heating and hot water requests are blocked whilst
the installation assistant is active.
Note
If you do not confirm the launch of the install-
ation assistant within 10 seconds of switching
the system on, the basic display reappears.
▶To access the next point, confirm by pressing in each
case.
7.2.1 Language
▶Set the required language.
▶To confirm the set language and to avoid unintentionally
changing it, press to confirm this twice.
If you have unintentionally set a language that you do not
understand, proceed as follows to change it:
▶Press and hold and at the same time.
▶Also briefly press .
▶Press and hold and until the display shows the
language setting option.
▶Select the required language.
▶Confirm twice by pressing .
7.2.2 Filling mode
Filling mode (check programme P.06) is activated automatic-
ally in the installation assistant for as long as the filling mode
appears on the display.
▶Fill the heating installation. (→Page 18)
7.2.3 Purging
1. Unlike in the Check programs menu, to purge the sys-
tem, start up the check programme P.00 by pressing
or .
–Minimum volume flow: 540 l/hr
Note
The check programme must run through
completely once, otherwise S.105 (Product
not purged) is displayed. The product starts
anyway if the specified hot water circulation
can be achieved. Furthermore, forced pur-
ging takes place. If the check programme
has run through completely once, S.105 is
cancelled. The product is completely ready
for operation
2. The purging is time-optimised and adaptive thanks to
the automatic switching between the heating circuit and
the hot water circuit.
7.2.4 Hydraulic operating mode
▶The product is equipped with a constant pressure regula-
tion, which means that an overflow section is no longer
necessary (factory setting). If a low loss header is in-
stalled in the heating installation, the "direct supply" func-
tion must be deactivated and a fixed pump speed must
be selected.
▶If required, adjust the hydraulic operating mode.
7.2.5 Pressure level
▶If required, adjust the pressure level for the hydraulic op-
erating mode that was set at the factory (without over-
flow) (default setting: 200 mbar).

7 Start-up
16 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
7.2.6 Target feed temperature, hot water
temperature, Comfort mode
1. To set the target feed temperature, hot water temperat-
ure and Comfort mode, press and .
2. Confirm by pressing .
7.2.7 Heating partial load
The heating partial load of the product is set to Auto at the
factory. The product independently determines the optimum
heating output depending on the current heat demand of
the system. You can retroactively adjust the setting in the
Diagnostics menu under D.000.
7.2.8 Green iQ
▶Set Green iQ mode (energy-saving mode for hot water
generation with cylinder and heating mode) (default set-
ting: On).
Note
Green iQ mode is a special operating mode
that can be used to save energy. If this mode
is activated, the product operates in the heat-
ing and cylinder charging mode in such a way
that the maximum benefits associated with
condensing technology are achieved. Un-
der certain circumstances, this may result in
comfort bottlenecks because, in this operating
mode, the cylinder charging time may be ex-
tended, for example.
7.2.9 Auxiliary relay and multi-functional module
1. If you have connected additional components to the
product, assign these components to the individual re-
lays.
2. In each case, confirm by pressing .
Note
This setting can be retroactively changed in
the Diagnostics menu using D.026,D.027
and D.028.
7.2.10 Gas type
1. Select the gas type that is available at the installation
site (default setting: Natural gas). If required, retroact-
ively change the gas type using diagnostics code D.087
and plug the correct coding resistor (plug X24: Natural
gas = yellow, liquefied petroleum gas = grey) into the
PCB; see the wiring diagram in the appendix.
Conditions: Liquid gas set
▶If you have selected the "liquid gas" gas type, after the
start-up process is complete, affix the enclosed "Liquid
gas" conversion sticker onto the data plate and affix
the enclosed tank sticker (propane quality) so that it is
clearly visible on the tank or the cylinder cabinet, if pos-
sible close to the filler nozzle.
7.2.11 Contact data
▶If required, store your telephone number in the Appli-
ance config. (max. 16 digits/no blank spaces). The oper-
ator can view the telephone number.
7.2.12 Ending the installation assistant
▶Once you have run through the installation assistant suc-
cessfully, confirm by pressing .
◁The installation assistant will close and will not launch
again when the product is next switched on.
7.3 Restarting the installation assistants
Menu →Installer level →Start inst. assistant
You can restart the installation assistant at any time by call-
ing it up in the menu.
7.4 Test programmes
Menu →Installer level →Test programs
As well as the installation assistants, you can also call up
the following test programmes for start-up, service and
troubleshooting.
–Check programs
–Function menu
–Electronics self-test
7.5 Using check programmes
Menu →Installer level →Test programs →Check pro-
grams
Note
If the product does not start with the check pro-
grammes P.01,P.02 and in maximum output
mode, the minimum circulation of the heating
water may not have been reached. If S.85 is dis-
played in the Live Monitor, the circulation must
be increased in the heating system.
Display Meaning
P.00 Purging check programme:
The internal pump is cyclically actuated.
The heating circuit and hot water circuit are purged
adaptively by automatically switching the circuits via
the automatic air vent (the cap for the automatic air
vent is loosened at the factory). Hot water circuit
active or Heating circuit active display.
1 x : Start purging
1 x (Cancel): End purge programme
Note
The duration of the purge programme is displayed by
a countdown timer. The programme then ends.
P.01 Maximum load check programme:
After successful ignition, the product is operated at
maximum heat input.
P.02 Minimum load check programme:
After successful ignition, the product is operated at
minimum heat input.

Start-up 7
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 17
Display Meaning
P.04 Reset eGas CH (Central Heating) check programme:
Calling up the programme deletes all of the CH cor-
rection values that have been saved from previous
calibration processes. The products then starts by
fully calibrating the combustion regulation (status
S.09).
P.06 Filling mode check programme:
The diverter valve is moved to the mid-position. The
burner and pump are switched off (to fill or drain the
product).
P.14 Reset eGas DHW (Domestic Hot Water) check
programme:
Calling up the programme deletes all of the DHW
correction values that have been saved from previ-
ous calibration processes. The products then starts
by fully calibrating the combustion regulation (status
S.19).
7.6 Checking and treating the heating
water/filling and supplementary water
Caution.
Risk of material damage due to poor-qual-
ity heating water
▶Ensure that the heating water is of suffi-
cient quality.
▶Before filling or topping up the installation, check the
quality of the heating water.
Checking the quality of the heating water
▶Remove a little water from the heating circuit.
▶Check the appearance of the heating water.
▶If you ascertain that it contains sedimentary materials,
you must desludge the installation.
▶Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶If you ascertain that it contains magnetite, clean the in-
stallation and apply suitable corrosion-protection meas-
ures, or fit a magnetic filter.
▶Check the pH value of the removed water at 25 °C.
▶If the value is below 8.2 or above 10.0, clean the installa-
tion and treat the heating water.
▶Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶Before filling the installation, measure the hardness of the
filling and supplementary water.
Treating the filling and supplementary water
▶Observe all applicable national regulations and technical
standards when treating the filling and supplementary
water.
▶In particular, observe VDI directive 2035, sheets 1 and 2.
Provided the national regulations and technical standards
do not stipulate more stringent requirements, the following
applies:
You must treat the heating water in the following cases:
–If the entire filling and supplementary water quantity dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or
–If the guideline values listed in the following table are not
met, or
–If the pH value of the heating water is less than 8.2 or
more than 10.0.
Total
heating
output
Water hardness at specific system volume1)
≤20 l/kW > 20 l/kW
≤50 l/kW > 50 l/kW
kW °dH mol/m³°dH mol/m³°dH mol/m³
< 50 < 16.8 < 3 11.2 2 0.11 0.02
> 50
to ≤200
11.2 2 8.4 1.5 0.11 0.02
> 200
to ≤600
8.4 1.5 0.11 0.02 0.11 0.02
> 600 0.11 0.02 0.11 0.02 0.11 0.02
1) Nominal capacity in litres/heating output; in the case of multi-
boiler systems, the smallest single heating output is to be used.
Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
▶Do not use any unsuitable frost and cor-
rosion protection agents, biocides or seal-
ants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
–Adey MC3+
–Adey MC5
–Fernox F3
–Sentinel X 300
–Sentinel X 400
Additives intended to remain permanently in the
installation
–Adey MC1+
–Fernox F1
–Fernox F2
–Sentinel X 100
–Sentinel X 200
Additives for frost protection intended to remain
permanently in the installation
–Adey MC ZERO
–Fernox Antifreeze Alphi 11
–Sentinel X 500
▶If you have used the above-mentioned additives, inform
the end user about the measures that are required.

7 Start-up
18 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
▶Inform the end user about the measures required for frost
protection.
7.7 Preventing low water pressure
To ensure that the heating installation operates smoothly,
the indicator on the pressure gauge must point to the upper
half of the grey area or to the middle of the bar graph display
in the display (marked by the dashed limit values) when the
heating installation is cold. This corresponds to a filling pres-
sure of between 0.1 MPa and 0.2 MPa (1.0 bar and 2.0 bar).
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
If the filling pressure falls below 0.08 MPa (0.8 bar), the
product indicates low pressure by displaying a flashing
pressure value. If the filling pressure falls below 0.05 MPa
(0.5 bar), the product switches off. The display shows F.22.
▶Top up the heating water to start the product up again.
The pressure value flashes in the display until a pressure of
0.11 MPa (1.1 bar) or higher has been reached.
7.8 Filling the heating installation
1
1. Flush the heating installation through.
2. Select the check programme P.06.
◁The diverter valve moves to the mid-position, the
pumps do not run and the product does not switch
to heating mode.
Note
The cap on the automatic air vent (1) has
already been opened at the factory.
3. Observe the information on treating heating water.
(→Page 17)
4. Connect the filling and drainage tap in the heating in-
stallation to a heating water supply, if possible with the
cold water valve, in accordance with the relevant stand-
ards.
5. Open the heating water supply.
6. Open all thermostatic radiator valves.
7. If necessary, check that both service valves on the
product are open.
8. Slowly open the filling and drainage tap so that the wa-
ter flows into the heating system.
9. Purge the lowest radiator until water flows out of the
purging valve without bubbles.
10. Purge all other radiators until the entire heating system
has been filled with water.
11. Close all purging valves.
12. Monitor the rising filling pressure in the heating installa-
tion.
13. Fill with water until the required filling pressure is
reached.
14. Close the filling and drainage tap and the cold water
valve.
15. Check all connections and the entire system for leaks.
7.9 Purging the heating installation
1. Select the check programme P.00.
◁The product does not start up, the internal pump
operates intermittently and purges either the heating
circuit or the hot water circuit.
◁The display shows the filling pressure of the heating
installation.
2. Make sure that the filling pressure of the heating install-
ation does not fall below the minimum filling pressure.
– ≥ 0.08 MPa (≥0.80 bar)
◁At the end of the filling procedure, the filling pres-
sure of the heating installation should be at least
0.02 MPa (0.2 bar) above the counter-pressure
of the expansion vessel ("Exp") (PInstallation ≥PExp +
0.02 MPa (0.2 bar)).
3. If there is still too much air in the heating installation at
the end of the check programme P.00, repeat the check
programme.
7.10 Filling and purging the hot water system
1. Open the cold water stop valve on the product.
2. Fill the hot water system by opening all the hot water
draw-off valves until water escapes.
7.11 Filling the condensate siphon
1
1. Remove and, if required, clean the lower section of the
siphon (1).
2. Fill the siphon trap with water up to 10 mm below the
upper edge.
3. Secure the lower section of the siphon to the condens-
ate siphon.

Start-up 7
0020189875_01 ecoTEC exclusive Installation and maintenance instructions 19
7.12 Starting up the heat generator
The product has a gas-adaptive heat cell that automatically
adjusts to the relevant gas type. We recommend that you
start up the heat cell using the following steps. Calibration
establishes the operational readiness. This calibration is
also a prerequisite for the correct measurement of gas flow
pressure and CO₂content.
–Deleting existing calibration values
–Calibrating in maximum mode
–Calibrating in minimum mode
▶Install the front casing.
▶Ensure that there is sufficient hot water circulation.
▶Navigate to Menu →Installer level →Check programs
and confirm by pressing .
▶Start check programme P.04.
◁Existing calibration points are deleted. The display
shows the successful deletion.
▶Start check programme P.01.
–Duration: 7-10 minutes. Automatic programme end
after 15 minutes
◁If the circulation in the heating system is sufficient,
the test routine starts and determines the calibration
points for maximum power. S.93 is displayed.
▽S.85 is displayed. The circulation in the heating sys-
tem is not sufficient.
◁After max. 10 minutes, S.04 is displayed.
▶Press to end the check programme.
▶Start check programme P.02.
–Duration: 3-5 minutes. Automatic programme end
after 15 minutes
◁If the circulation in the heating system is sufficient,
the test routine starts and determines the calibration
points for minimum power. S.93 is displayed.
▽S.85 is displayed. The circulation in the heating sys-
tem is not sufficient.
◁After max. five minutes, S.04 is displayed.
▶Press to end the check programme.
◁All calibration points have been determined.
7.13 Gas inspection
7.13.1 Checking the gas flow pressure
1. Close the gas isolator cock.
2. Remove the front casing. (→Page 9)
1
1
3. Use a screwdriver to undo the sealing screw of the
measuring nipple (1) at the gas valve.
4. Connect a pressure gauge (2) to the measuring nipple
(1).
5. Open the gas isolator cock.
6. Start up the product with the check programme P.01.
▽If S.85 is shown, the hot water circulation must be
extended.
◁S.93 is briefly displayed.
◁If the display switches to S.04, the product is ready
for the measurement.
7. Measure the gas flow pressure in comparison with the
atmospheric pressure.
–Permissible gas flow pressure for operation
with G20 natural gas: 1.8 … 2.5 kPa (18.0
… 25.0 mbar)
–Permissible gas flow pressure for operation
with G25 natural gas: 1.8 … 2.5 kPa (18.0
… 25.0 mbar)
–Permissible gas flow pressure for operation
with G31 liquid gas: 4.25 … 5.75 kPa (42.50
… 57.50 mbar)
8. Decommission the product.
9. Close the gas isolator cock.
10. Remove the pressure gauge.
11. Tighten the screw on the measuring nipple (1).
12. Open the gas isolator cock.
13. Check the measuring nipple for gas tightness.
Conditions: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas flow pres-
sure.
If the gas flow pressure lies outside the per-
missible range, this can cause operating
faults in and damage to the product.
▶Do not make any adjustments to the
product.
▶Do not start up the product.

8 Adapting the unit to the heating installation
20 Installation and maintenance instructions ecoTEC exclusive 0020189875_01
▶If you are unable to remedy the fault, contact the gas
supply company.
▶Close the gas isolator cock.
7.13.2 Checking the CO₂content
Caution.
Risk of operating faults caused by the
corruption of the measured values during
the calibration.
Operating the product with the front casing
open or not completely installed, or with the
flue pipe open, may negatively influence the
calibration of the gas-air mixture.
▶During the calibration and when measur-
ing the CO₂content, you must operate the
product with the front casing installed and
closed, and with the flue pipe completely
installed.
1. Start up the product.
Note
Since the combustion can be continuously
monitored by the product, you do not need to
check the combustion.
2. Press and at the same time to activate the max-
imum output operation.
▽If S.85 is displayed, the circulation must be
increased in the heating system.
◁The display shows Chimney sweep and S.93 at the
same time.
◁The product runs through a calibration process on
the flue gas installation and the gas quality.
3. Wait until the calibration process has taken place.
◁After the calibration procedure ends, the display
shows Chimney sweep and S.04 at the same time.
4. Now measure the CO₂content at the flue gas analysis
point.
◁The product restarts the measuring programme after
the burner has been operating for five minutes so
that it can take heating effects into consideration.
◁The combustion automatically optimises itself. CO₂
content of 8.0 to 10.5 vol.% natural gas) and of 9.0
to 11.8 vol.% (liquid gas) can be measured.
Note
After initial start-up or starting the check pro-
gramme P.04, depending on the heating par-
tial load that is set and the existing heat con-
sumption by the heating installation, it may
be the case that the product runs through the
measuring programme several times. During
the calibration process, no flue gas analysis
is possible.
7.14 Checking leak-tightness
▶Check the gas pipe, the heating circuit and the domestic
hot water circuit for leak-tightness.
▶Check that the air/flue pipe has been installed correctly.
Conditions: Room-sealed operation
▶Check whether the vacuum chamber has been closed
tightly.
7.14.1 Checking the heating mode
1. Make sure that there is a heat requirement.
2. Call up Live monitor.
◁If the product is working correctly, the display shows
S.04.
7.14.2 Checking the hot water generation
1. Open a hot water valve all the way.
2. Call up the Live Monitor.
◁If hot water generation is working correctly, the
display shows S.24.
8 Adapting the unit to the heating
installation
To reset the most important system parameters, use the
Appliance config. menu item.
Menu →Installer level →Appliance config.
Or manually relaunch the installation assistant.
Menu →Installer level →Start inst. assistant
8.1 Calling up diagnostics codes
The settings options for more complex systems can be found
in the Diagnostics menu.
Menu →Installer level →Diagnostics menu
Overview of diagnostics codes (→Page 33)
You can use the parameters that are marked as adjustable
in the overview of diagnostics codes to adapt the product to
the heating installation and the needs of the customer.
8.2 Burner anti-cycling time
To prevent frequent switching on and off of the burner and
thus prevent energy losses, an electronic restart lockout
is activated for a specific period each time the burner is
switched off. The burner anti-cycling time is only active
for the heating mode. Hot water handling during a burner
anti-cycling time does not affect the time function element
(default setting: 20 mins).
8.2.1 Setting the burner anti-cycling time
1. Navigate to Menu →Installer level →Diagnostics
menu →D.002 Max. anti-cycl. time: Heating and con-
firm by pressing .
2. Set the burner anti-cycling time and confirm by pressing
.