Vaillant ecoFIT pure User manual

For the competent person
Installation and maintenance instructions
ecoFIT pure
412 - 435
GB, IE
Installation and maintenance instructions
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 ecoFIT pure 0020230535_01
Contents
1 Safety .................................................................... 3
1.1 Action-related warnings ......................................... 3
1.2 Risk caused by inadequate qualifications.............. 3
1.3 Intended use .......................................................... 3
1.4 General safety information .................................... 3
1.5 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 Benchmark............................................................. 6
3.2 Compartment Ventilation ....................................... 6
3.3 Information on the identification plate.................... 6
3.4 CE label ................................................................. 7
3.5 Functional elements............................................... 7
4 Assembly.............................................................. 7
4.1 Transporting the unit.............................................. 7
4.2 Unpacking the product........................................... 7
4.3 Checking the scope of delivery.............................. 7
4.4 Dimensions ............................................................ 8
4.5 Minimum clearances.............................................. 8
4.6 Using the installation template............................... 8
4.7 Wall-mounting the product..................................... 8
4.8 Removing/installing the front casing...................... 9
4.9 Removing/installing the side section ..................... 9
5 Installation.......................................................... 10
5.1 Preparing for installation...................................... 10
5.2 Installing the heating pump.................................. 10
5.3 Heating water supply in the open heating
system ................................................................. 11
5.4 Connecting the heating flow and heating
return ................................................................... 11
5.5 Gas connection.................................................... 11
5.6 Connecting the condensate discharge pipe ........ 12
5.7 Flue gas installation............................................. 12
5.8 Electrical installation ............................................ 12
6 Operation............................................................ 14
6.1 Operating concept ............................................... 14
6.2 Installer level overview......................................... 14
6.3 Calling up the installer level................................. 14
6.4 Live Monitor (status codes) ................................. 14
6.5 Using check programmes.................................... 15
7 Start-up ............................................................... 15
7.1 Carrying out the initial start-up............................. 15
7.2 Checking the factory setting ................................ 15
7.3 Checking and treating the heating water/filling
and supplementary water .................................... 15
7.4 Filling the condensate siphon .............................. 16
7.5 Switching on the product ..................................... 17
7.6 Filling the heating installation .............................. 17
7.7 Checking the gas flow rate .................................. 17
7.8 Checking and adjusting the gas settings ............. 17
7.9 Checking leak-tightness ...................................... 18
7.10 Checking the heating mode................................. 18
8 Adapting the unit to the heating
installation.......................................................... 18
8.1 Burner anti-cycling time ....................................... 19
9 Handing the product over to the operator ...... 19
10 Troubleshooting ................................................ 19
10.1 Rectifying faults ................................................... 19
10.2 Calling up and clearing the fault memory ............ 19
10.3 Resetting parameters to factory settings ............. 19
10.4 Preparing the repair work .................................... 19
10.5 Replacing defective components......................... 19
10.6 Checking the product for leak-tightness .............. 21
11 Inspection and maintenance ............................ 21
11.1 Using original seals.............................................. 21
11.2 Observing inspection and maintenance
intervals ............................................................... 21
11.3 Procuring spare parts .......................................... 21
11.4 Checking the CO₂content ................................... 21
11.5 Setting the CO₂content ....................................... 22
11.6 Removing the gas-air mixture unit....................... 22
11.7 Cleaning the heat exchanger............................... 23
11.8 Checking the burner ............................................ 23
11.9 Checking the ignition electrode ........................... 23
11.10 Cleaning the condensate siphon ......................... 23
11.11 Installing the gas-air mixture unit......................... 24
11.12 Completing inspection and maintenance work .... 24
11.13 Checking the product for leak-tightness .............. 24
12 Decommissioning the product......................... 24
13 Customer service............................................... 24
Appendix ............................................................................ 25
A Inspection and maintenance work –
Overview............................................................. 25
B Overview of diagnostics codes........................ 25
C Status codes –Overview .................................. 28
D Overview of fault codes .................................... 29
E Connection diagram .......................................... 31
F Connection diagram, 30 kW.............................. 32
G Opening in the flue pipe.................................... 33
G.1 Positioning of the opening of a fan-supported
flue gas pipe ........................................................ 33
G.2 Horizontal terminal positioning ............................ 34
H Commissioning Checklist................................. 35
I Technical data.................................................... 39
Index ................................................................................... 43

Safety 1
0020230535_01 ecoFIT pure 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 Risk caused by inadequate
qualifications
The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:
–Installation
–Disassembly
–Installation
–Start-up
–Maintenance
–Repair
–Decommissioning
▶Observe all instructions that are included
with the product.
▶Proceed in accordance with the current
state of technology.
▶Observe all applicable directives, stand-
ards, laws and other regulations.
1.3 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 class.
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.
1.4 General safety information
1.4.1 Risk of injury due to the heavy
weight of the product
▶Make sure that the product is transported
by at least two people.
1.4.2 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.

1 Safety
4Installation and maintenance instructions ecoFIT pure 0020230535_01
▶Do not use any electrical switches, mains
plugs, doorbells, telephones or other com-
munication systems in the building.
▶If it is safe to do so, 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.
▶Notify the gas supply company or the Na-
tional Grid [phone] by tele-
phone once you are outside of the build-
ing.
1.4.3 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.
1.4.4 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.
1.4.5 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.
1.4.6 Risk of death due to explosive and
flammable materials
▶Do not use or store explosive or flammable
materials (e.g. petrol, paper, paint) in the
installation room of the product.
1.4.7 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:
▶Disconnect the product from the power
supply by switching off all power supplies
(electrical partition with a contact opening
of at least 3 mm, e.g. fuse or line protec-
tion switch).
▶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.
1.4.8 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.
1.4.9 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 air/flue
pipe.
▶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.

Safety 1
0020230535_01 ecoFIT pure Installation and maintenance instructions 5
1.4.10 Risk of material damage caused by
frost
▶Do not install the product in rooms prone
to frost.
1.4.11 Risk of being burned or scalded by
hot components
▶Only carry out work on these components
once they have cooled down.
1.4.12 Risk of material damage caused by
using an unsuitable tool
▶Use the correct tool to tighten or loosen
screw connections.
1.5 Regulations (directives, laws,
standards)
▶Observe the national regulations, stand-
ards, guidelines and laws.

2 Notes on the documentation
6Installation and maintenance instructions ecoFIT pure 0020230535_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:
Product article number
Article number Gas Council
Number
VU 126/6-3 OV (H-GB) 0010020400 41-694-08
VU 156/6-3 OV (H-GB) 0010020401 41-694-09
VU 186/6-3 OV (H-GB) 0010020402 41-694-10
VU 256/6-3 OV (H-GB) 0010020403 41-694-11
VU 306/6-3 OV (H-GB) 0010020404 41-694-12
VU 356/6-3 OV (H-GB) 0010020405 41-694-19
3 Product description
3.1 Benchmark
Vaillant is a licensed member of the Benchmark Scheme.
Benchmark places responsibilities on both manufacturers
and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the
manufacturer’s instructions by a competent person approved
at the time by the Health and Safety Executive and that it
meets the requirements of the appropriate Building Regu-
lations. The Benchmark Checklist can be used to demon-
strate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commission-
ing and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and
Hotwater Industry Council who manage and promote the
Scheme.
Benchmark is managed and promoted by the Heating and
Hotwater Industry Council.
For more information visit www.centralheating.co.uk
3.2 Compartment Ventilation
The boilers are very high efficiency appliances.
As a consequence the heat loss from the appliance casing
during operation is very low.
Compartment ventilation is not required as the products are
only certified, and can only be fitted with a concentric flue
system.
3.3 Information on the identification plate
The identification plate is mounted on the underside of the
product in the factory.
The identification plate keeps record of the country in which
the product is to be installed.
Information on the
identification plate
Meaning
Barcode with serial number
Serial number For quality control purposes; 3rd and 4th
digits = year of production
For quality control purposes; 5th and 6th
digits = week of production
For identification purposes; 7th to 16th
digits = product article number
For quality control purposes; 17th to 20th
digits = place of manufacture
ecoFIT pure Product designation
2H, G20 –2 kPa
(20 mbar)
Factory setting for type of gas and gas
connection pressure
Cat. Unit category
Condensing techno-
logy
Efficiency class of the boiler in accord-
ance with EC Directive 92/42/EEC
Type: Xx3(x) Permissible flue gas connections
PMS Maximum water pressure in heating
mode
PMW Maximum water pressure in hot water
handling mode
V/Hz Electrical connection
W Max. electrical power consumption
IP Level of protection
Heating mode
Pn Nominal heat output range in heating
mode
Pnc Nominal heat output range in heating
mode (condensing technology)
P Nominal heat output range in hot water
handling mode
Qn Nominal heating load range in heating
mode
Qnw Nominal heating load range in hot water
handling mode
Tmax. Max. flow temperature
NOx NOx class for the product
Code (DSN) Specific product code
Read the instructions.
GC no. Gas council number

Assembly 4
0020230535_01 ecoFIT pure Installation and maintenance instructions 7
3.4 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.
3.5 Functional elements
4
5
6
3
11
10
9
7
8
1
2
1 Supply air measuring
stub pipe (for upper flue
gas connection)
2 Flue gas analysis point
(for upper flue gas
connection)
3 Gas-air mixture unit
4 Flue gas pipe
5 Flue gas analysis point
(for rear flue gas con-
nection)
6 Gas valve
7 Ignition transformer
8 Heat exchanger
9 Air intake pipe
10 Condensate siphon
11 Electronics box
4 Assembly
4.1 Transporting the unit
Important: With regard to the regulations of 1992 concern-
ing the manual handling of loads, the unit exceeds the
weight that can be lifted by a single person.
4.1.1 General
▶Hold the load as close as possible to your body. Avoid
rotational movements. Instead, reposition your feet.
▶If the unit is being lifted by two persons, ensure your
movements are coordinated during lifting.
▶Avoid bending your upper body –do not lean forwards or
to the side.
▶Wear suitable non-slip protective gloves in order to pro-
tect your hands against sharp edges. Ensure that you are
carrying the load securely.
▶If required, get somebody to assist you in this.
4.1.2 Unloading the box from the delivery van
▶It is recommended that two people lift the unit together.
▶Lift the box using the straps provided.
▶Use safe lifting techniques –keep your back straight and
bend your legs at the knee.
▶Hold the load as close as possible to your body.
▶If the unit is being lifted by two persons, ensure your
movements are coordinated during lifting.
▶If required, get somebody to assist you in this.
4.2 Unpacking the product
1. Remove the product from its box.
2. Remove the protective film from all of the product's
components.
4.3 Checking the scope of delivery
▶Check that the scope of delivery is complete and intact.
4.3.1 Scope of delivery
Num-
ber Description
1Heat generator
1Hanging bracket
1 Flue gas adaptor
1Gas isolator cock
1 Gas pipe
1 Condensate drain hose
1Installation template
1 Enclosed documentation

4 Assembly
8Installation and maintenance instructions ecoFIT pure 0020230535_01
4.4 Dimensions
112
183,5 71
375
7833,5
602
220
150
32,5 100
157,5
280
1
2
3
4
5
6
1 Condensate discharge
2 Gas connection
3 Heating return
4 Heating flow
5 Connection on the back
of the air/flue pipe
6 Connection on the top
of the air/flue pipe
4.5 Minimum clearances
CC
A
B
D
Minimum clearance
A 150 mm (upper air/flue gas connection)
20 mm (air/flue gas connection on the rear)
B 150 mm
C 5 mm
(70 mm if the side panels ought to be removed)
D 600 mm
It is not necessary to maintain a clearance between the
product and components made of combustible materials that
go beyond the minimum clearances.
4.6 Using the installation template
▶Use the installation template to ascertain the locations at
which you need to drill holes and make breakthroughs.
4.7 Wall-mounting the product
Note
If you are using the rear air/flue gas connection,
install the flue pipe before you wall-mount 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.

Assembly 4
0020230535_01 ecoFIT pure Installation and maintenance instructions 9
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 using the permitted
fixing material provided on-site.
4.8 Removing/installing the front casing
4.8.1 Removing the front casing
B
D
C
A
1. Undo the two screws .
2. Gently press the front casing backwards in the centre
and pull it downwards on the lower edge so that the
retaining clip is released.
3. Pull the front casing forwards at the bottom edge.
4. Lift the front casing upwards from the retainers.
4.8.2 Installing the front casing
1. Place the front casing on the upper retainer.
2. Press the front casing onto the product so that the re-
tainer bracket clicks into place.
3. Secure the front casing by tightening both screws.
4.9 Removing/installing the side section
4.9.1 Removing the side section
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.
▶Always remove only one side section –
never both side sections at the same time.
Note
If there is sufficient lateral clearance (at least
70 mm), you can remove the side section to fa-
cilitate maintenance or repair work.
C
D
A
B
E
1. Tilt the electronics box forward.
2. Hold on to the side section so that it cannot fall, and
unscrew both screws, one from the top and one from
the bottom.
3. Tilt the side section to the outside and take it out to-
wards the top.
4.9.2 Installing the side section
1. Push the side section into the recesses in the back wall.
2. Tilt the side section towards the product.
3. Screw the two screws into the side section, one at the
top and one at the bottom.
4. Fold up the electronics box.

5 Installation
10 Installation and maintenance instructions ecoFIT pure 0020230535_01
5 Installation
5.1 Preparing for installation
Danger!
Risk of scalding and/or damage due to
incorrect installation leading to escaping
water.
Stresses in the supply line can cause leaks.
▶Make sure there is no voltage in the sup-
ply lines when they are installed.
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 connection pieces if the con-
nection pieces are not yet screwed to the
service valves.
Caution.
Risk of material damage caused by
changes to the connected pipes.
▶Only bend connection pipes if they have
not yet been connected to the product.
Caution.
Risk of damage caused by incorrect gas
installation.
Excess test pressure or operating pressure
may cause damage to the gas valve.
▶Check the leak-tightness of the gas valve
using a maximum pressure of 11 kPa
(110 mbar).
▶Flush the heating installation thoroughly prior to installa-
tion.
▶Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
▶Install the following components:
–Drain cocks at the lowest points in the heating install-
ation (→current version of "BS 2879")
–A heating pump in the heating flow
–A bypass that is at least 1.5 m away from the product
–A stop cock in the gas pipe
–Where applicable, a flow regulator valve to adjust the
flow rate
Pressure loss
from the product
0
50
100
150
200
250
300
350
400
0 200 400 600 800 1000 1200 1400 1600
430
424
418
415
412
435
A
B
1
2
A Flow rate [l/h]
B Pressure loss [mbar]
1 Pressure loss –ecoFIT
pure 412 - 418
2 Pressure loss –ecoFIT
pure 424 - 435
The flow rate must not fall below the value in the diagram.
5.2 Installing the heating pump
▶Only use pumps that have an in-rush current ≤10/15 A.
▶When designing/selecting the pump, note the pressure
loss of the product.
▶Install the pump in the heating flow.
▶Install the pump upstream and downstream of the pump
isolation valves.
▶Set the pump so that the temperature difference between
the flow and return is no more than 20 °C when the max-
imum flow temperature is set.
–The flow rate specified in the technical data is
reached.

Installation 5
0020230535_01 ecoFIT pure Installation and maintenance instructions 11
5.3 Heating water supply in the open heating
system
▶Connect the product to a supply/expansion tank as
shown in the figure.
–The tank must not be more than 27 m (90 ft) above
the product.
–The purging line must be installed with an upward
gradient and must not be blocked.
–Supply line diameter: ≥15 mm
–The relative positions of the pump, supply and pur-
ging line must be as shown in the figure.
Conditions: Combined supply and purging line
▶Install the line in accordance with "BS 5449".
–Diameter: ≥22 mm
5.4 Connecting the heating flow and heating
return
2
1
1 Heating return connec-
tion
2 Heating flow connection
1. Establish the heating connections in accordance with
the applicable standards.
2. Purge the gas pipe before start-up.
3. Check whether the connections (→Page 18) are leak-
tight.
5.5 Gas connection
1
1. Establish the gas connection (1) in accordance with the
applicable standards.
2. Purge the gas line before start-up.
3. Check the entire gas line properly for leak-tightness.

5 Installation
12 Installation and maintenance instructions ecoFIT pure 0020230535_01
5.6 Connecting the condensate discharge pipe
1
2
▶Follow the instructions listed here and observe directives
and local regulations on condensate discharge.
▶Use PVC or another material that is suitable for draining
the non-neutralised condensate.
▶If it cannot be guaranteed that the materials the drain
lines are made from are suitable, install a system for
neutralising the condensate.
▶Ensure that the connection between the condensate
drain pipework and the drain hose is not air-tight.
Note
The condensate drain pipework must have a
continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable
drain point within the heated envelope of the
building that will remain frost free under long
periods of low external temperatures.
▶During installation remove all burs from inside of cut pipe
work and avoid excessive adhesive which may trap small
pockets of water close to the pipe wall which can freeze
and build into a larger ice plug.
▶As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and beware
when crossing cavities that the fall is maintained and the
pipe sleeved.
You can find further information in the "BS 6798" specific-
ation for installing and maintaining gas-fired boilers with a
nominal heat load of less than 70 kW.
5.7 Flue gas installation
5.7.1 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.
2. Observe the information on positioning the opening
for the flue pipe. This information can be found in the
appendix.
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 site.
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.
3. Install the flue pipe using the installation manual.
5.8 Electrical installation
Danger!
Risk of death from electric shock!
The power supply terminals L and N remain
live even if the product is switched off:
▶Switch off the power supply.
▶Secure the power supply against being
switched on again.
5.8.1 Opening the electronics box
A
B
B
▶Follow the instructions in the specified sequence.

Installation 5
0020230535_01 ecoFIT pure Installation and maintenance instructions 13
5.8.2 Cable route
1
2
1 24-V eBUS cable route 2 230-V eBUS cable route
5.8.3 Carrying out the wiring
30 mm max.
1. Shorten the connection cables to the appropriate
lengths to prevent them from causing damage inside
the electronics box.
2. Screw the plug to the connection cable.
3. Plug the plug into the slot provided on the PCB.
5.8.4 Establishing the power supply
1
1. Observe all valid regulations.
2. Ensure that the rated mains voltage is 230 V.
3. Set up a fixed connection and install a partition with a
contact opening of at least 3 mm (e.g. fuses or power
switches).
4. Provide one common electricity supply for the boiler
and for the corresponding controller:
–Power supply: Single-phase, 230 V, 50 Hz
–Fuse protection: ≤3 A
5. Open the electronics box. (→Page 12)
6. Observe the routing of the power supply cable (1) in the
electronics box in order to guarantee that there is no
strain.
≤ 30 mm
NL X1
230V~
RT
7. Carry out the wiring. (→Page 13)
8. Close the electronics box.
9. Make sure that access to the mains connection is al-
ways available and is not covered or blocked.
5.8.5 Connecting controllers to the electronic
system
X2
X22
X41
–+
24V=
RT BUS
Burner
off
X106
BUS24 V
BUSRTB.off
Burner
off
RT
24V = -+
BUS
1
4
32
1 Safety thermostat for
floor-standing heating
2 24 V controller
3 eBUS controller or radio
receiver unit
4 Outside temperature
sensor, wired
1. Open the electronics box. (→Page 12)
2. Carry out the wiring. (→Page 13)

6 Operation
14 Installation and maintenance instructions ecoFIT pure 0020230535_01
3. Connect the individual components depending on the
type of installation.
Conditions: If installing a multi-circuit controller.
▶Change the pump's operating mode d.18 from Eco (in-
termittently operating pump) to Comfort (continuously
operating pump).
Conditions: When connecting a controller (230 V).
≤ 30 mm
NL X1
230V~
RT
▶Connect the controller to the main plug.
▶Remove the bridge from the plug 24V=RT.
Conditions: 230 V 3-wire connection
▶Ensure that the controller is designed for a maximum
rated current of 7 A.
▶Connect the controller to the main plug X1.
–Terminal assignment: L ‑line, N ‑neutral conductor,
‑earth
▶Draw the operator's attention to the fact that the follow-
ing features are present with this type of installation.
◁The frost protection function is deactivated. If the
product is installed in a room where there is a risk
of frost and it has not been protected by a room ther-
mostat, install an additional frost protection thermo-
stat.
◁The pump programmes are not active.
◁If the product is switched off, the display is switched
off.
◁Each time the unit is started, the fan runs for
20 seconds.
◁Residual heat in the heating return may result in the
product blocking the burner for 10 minutes.
4. Close the electronics box.
6 Operation
6.1 Operating concept
The operating concept and the display and setting facilities
of the operator level are described in the operating instruc-
tions.
An overview of the display and setting options in the installer
level can be found in the section "Overview of the installer
level". (→Page 14)
6.2 Installer level overview
S.31
Code
D.---
PF
P.--
DF
--/--
DP
6.3 Calling up the installer level
1. Only call up the installer level if you are a competent
person.
2. Press and ("i") at the same time.
◁S.xx appears in the display (current unit status).
3. Press to access the installer level.
◁Code and -- appear in the display.
4. Set the value 17 (code) and confirm by pressing .
5. Press to access the check programmes (P) and the
fault codes (F) and to return to the diagnostics codes
(D).
6. Use or to set the required value and confirm by
pressing .
7. Confirm by pressing ( ).
8. Press to cancel a setting or exit the installer level.
6.4 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 28)

Start-up 7
0020230535_01 ecoFIT pure Installation and maintenance instructions 15
6.5 Using check programmes
Call up the installer level + 1x
Display Meaning
P.00 Purging check programme:
The internal pump is cyclically actuated.
The heating circuit and the hot water circuit are
purged via the automatic air vent (the cap of the
automatic air vent must be released).
1 x : Start heating circuit purging
2 x ( ): Start hot water circuit purging
3 x ( ): Restart heating circuit purging
1 x (Cancel): End purge programme
Note
The purge programme runs for 7.5 min per circuit
and then terminates.
Purging the heating circuit:
Diverter valve in heating position, actuation of in-
ternal pump for 9 cycles: 30 sec. on, 20 sec. off.
Display: Active heating circuit.
Purging the hot water circuit:
After the above-mentioned cycles have run or the
right-hand selection button has been pressed again:
Diverter valve in the hot water position, actuation
of the internal pump as above. Display: Active hot
water circuit.
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.
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).
7 Start-up
7.1 Carrying out the initial start-up
Initial start-up must be carried out by a customer service
technician or an authorised competent person using the first-
commissioning-checklist. The first-commissioning-checklist
in the appendix (→Page 35) of the installation instructions
must be filled out and stored carefully along with the unit's
documentation.
▶Carry out the initial start-up using the first-commission-
ing-checklist in the appendix.
▶Fill out and sign the first-commissioning-checklist.
7.2 Checking the factory setting
The product's combustion has been factory tested and is
preset for operation with the gas group indicated on the iden-
tification plate.
The product is only authorised to be operated with natural
gas.
▶Check the information about the type of gas indicated on
the identification plate and compare this with the type of
gas available at the installation location.
Conditions: The product design is not compatible with the local gas
group
▶Do not start up the product.
Conditions: The product design is compatible with the local gas group
▶Proceed as described below.
7.3 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 system, 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 system.
▶Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶If you ascertain that it contains magnetite, clean the sys-
tem and apply suitable corrosion-protection measures, or
fit a magnet filter.
▶Check the pH value of the removed water at 25 °C.
▶If the value is below 6.5 or above 8.5, clean the system
and treat the heating water.
▶Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶Before filling the system, 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.
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

7 Start-up
16 Installation and maintenance instructions ecoFIT pure 0020230535_01
–if the pH value of the heating water is less than 6.5 or
more than 8.5.
Total
heating
output
Water hardness at specific system volume1)
≤20 l/kW > 20 l/kW
≤50 l/kW > 50 l/kW
kW ppm
CaCO₃
mol/
m³
ppm
CaCO₃
mol/
m³
ppm
CaCO₃
mol/
m³
< 50 < 300 < 3 200 2 2 0.02
> 50
to ≤200
200 2 150 1.5 2 0.02
> 200
to ≤600
150 1.5 2 0.02 2 0.02
> 600 2 0.02 2 0.02 2 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.
The use of unsuitable heating water may
cause aluminium corrosion and a result-
ing lack of leak-tightness.
In contrast to steel, grey cast iron or copper,
for example, aluminium reacts with alkaline
heating water (pH value > 8.5) to produce
substantial corrosion.
▶When using aluminium, make sure that
the pH value of the heating water is
between 6.5 and a maximum of 8.5.
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
system
–Adey MC1+
–Fernox F1
–Fernox F2
–Sentinel X 100
–Sentinel X 200
Additives for frost protection intended to remain
permanently in the system
–Adey MC ZERO
–Fernox Antifreeze Alphi 11
–Sentinel X 500
▶If you have used the above-mentioned additives, inform
the operator about the measures that are required.
▶Inform the operator about the measures required for frost
protection.
7.4 Filling the condensate siphon
C
2
3
1
AB
1. Unclip the lower section of the siphon (1) from the up-
per section of the siphon (2).
2. Remove the float (3).
3. Fill the lower section of the siphon with water up to
10 mm below the upper edge of the condensate drain
pipework.
4. Re-insert the float (3).
Note
Check whether the float is present in the
condensate siphon.
5. Clip the lower section of the siphon (1) into the upper
section of the siphon (2).

Start-up 7
0020230535_01 ecoFIT pure Installation and maintenance instructions 17
7.5 Switching on the product
▶Switch on the product via the main switch installed on-
site.
7.6 Filling the heating installation
1. Flush the heating installation through.
2. Fill the heating installation with the maximum possible
volume flow.
7.7 Checking the gas flow rate
The gas flow rate has been set during production and does
not require adjustment. With the front casing fitted check the
gas flow rate of the boiler as follows:
▶Start up the product with the check programme P.01.
▶In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermo-
stat.
▶Wait at least 5 minutes until the boiler has reached its
operating temperature.
▶Ensure that all other gas appliances in the property are
turned off.
▶Measure the gas flow rate at the gas meter.
▶Compare the measured values with the corresponding
values in the table.
Qnw from the data
plate
H gas in m³/h
Nom. +5% −10%
15.3 1.62 1.70 1.46
18.4 1.95 2.05 1.76
24.7 2.61 2.74 2.35
25.7 2.72 2.86 2.45
28.6 3.03 3.18 2.73
30.6 3.24 3.40 2.92
35.7 3.78 3.97 3.40
Conditions: Gas flow rate not in the permissible range
▶Check all of the piping and ensure that the gas flow rates
are correct.
▶Only put the product into operation once the gas flow
rates have been corrected.
Conditions: Gas flow rate in the permissible range
▶End the check programme P.01.
▶Allow the boiler to cool down by allowing pump overrun to
operate for a minimum of 2 minutes.
▶Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
7.8 Checking and adjusting the gas settings
Only a qualified competent person is authorised to imple-
ment the settings on the gas valve.
Each destroyed tamper-proof seal must be replaced.
The CO2 adjusting screw must be sealed.
Never modify the factory setting of the gas pressure regu-
lator of the gas valve.
7.8.1 Checking the gas connection pressure (gas
flow pressure)
1
2
1. Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
2. Close the gas isolator cock (1).
3. Undo the sealing screw on the measuring nipple (2).
4. Connect a pressure gauge to the measuring nipple (2).
5. Open the gas isolator cock (1).
6. Start up the product with check programme P.01
(system with eBUS controller) or P.03 (system without
eBUS controller).
7. In addition, ensure that maximum heat can be dissip-
ated into the heating system by turning up the room
thermostat.
8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (2)
complies with the requirements.
Permissible connection pressure
Great Bri-
tain
Natural gas G20 1.7
… 2.5 kPa
(17.0
… 25.0 mbar)
9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is un-
dersized.
Conditions: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas connec-
tion pressure.
If the gas connection pressure lies outside
the permissible range, this can cause oper-
ating faults in and damage to the product.
▶Do not make any adjustments to the
product.
▶Do not start up the product.
▶If you cannot correct the failure, notify the gas supply
company and proceed as follows:
▶End check programme P.01.

8 Adapting the unit to the heating installation
18 Installation and maintenance instructions ecoFIT pure 0020230535_01
▶Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
▶Close the gas isolator cock.
▶Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶Open the gas isolator cock (1).
▶Check the measuring nipple for gas tightness.
▶Close the gas isolator cock (1).
▶Install the front casing. (→Page 9)
▶Disconnect the product from the power mains.
▶You must not start up the boiler.
Conditions: Gas flow pressure in the permissible range
▶End the check programme P.01.
▶Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶Close the gas isolator cock (1).
▶Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶Open the gas isolator cock (1).
▶Check the measuring nipple for gas tightness.
▶Install the front casing. (→Page 9)
▶Reset boiler controls for normal operation.
▶Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
7.8.2 Checking the leak-tightness of the flue gas
installation and flue gas recirculation
1. Check the flue gas installation is intact in accordance
with the latest gas safe technical bulletin and informa-
tion supplied in the installation instructions.
2. For extended flue gas installations check for flue gas
recirculation using the air analysis point.
3. Use a flue gas analyser.
4. If you discover CO or CO2in the supply air, search for
the leak in the flue gas installation or for signs of flue
gas recirculation.
5. Eliminate the damage properly.
6. Check again whether the supply air contains any CO or
CO2.
7. If you cannot eliminate the damage, do not start up the
product.
7.8.3 Checking the CO₂content
1. Start up the product with check programme (P.01).
Overview of the check programmes (→Page 15)
2. Wait until the value that is read is stable.
–Waiting period for reading a stable value: 5 min
1
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂content
Great Bri-
tain
Removed
front cas-
ing/installed
front casing
Natural gas
G20
9.2 ±1 %
◁The value is OK.
▽The value is not OK; you cannot start up the
product.
▶Inform Customer Service.
7.9 Checking leak-tightness
▶Check the gas pipe, the heating circuit and the 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 sealed so
that it is leak-tight.
7.10 Checking the heating mode
1. Activate the heating mode on the user interface.
2. Turn all thermostatic radiator valves on the radiators
until they are fully open.
3. Allow the product to operate for at least 15 minutes.
4. Purge the heating installation.
5. Call up the Live Monitor.
–Menu →Live Monitor
Status codes –Overview (→Page 28)
◁If the product is working correctly, the display shows
S.04.
8 Adapting the unit to the heating
installation
You can reset/change the system parameters (section "Us-
ing diagnostics codes").
Overview of diagnostics codes (→Page 25)

Handing the product over to the operator 9
0020230535_01 ecoFIT pure Installation and maintenance instructions 19
8.1 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 mode during a burner
anti-cycling time does not affect the time function element.
8.1.1 Setting the burner anti-cycling time
▶Set the burner anti-cycling time via the diagnostics code.
Overview of diagnostics codes (→Page 25)
8.1.2 Resetting the remaining burner anti-cycling
time
▶Press the fault clearance key.
9 Handing the product over to the
operator
▶When you have finished the installation, attach the sticker
supplied (in the operator's language) to the product
cover.
▶Explain to the operator how the safety devices work and
where they are located.
▶Inform the operator how to handle the product.
▶In particular, draw attention to the safety information
which the operator must follow.
▶Inform the operator of the necessity to have the product
maintained on a regular basis.
▶Instruct the operator about measures taken to ensure the
supply of combustion air and flue gas pipe.
10 Troubleshooting
10.1 Rectifying faults
▶If fault messages (F.xx) appear, rectify the fault after
referring to the table in the appendix or using the check
programmes. (→Page 15)
Overview of fault codes (→Page 29)
If several faults occur at the same time, the display shows
the corresponding fault messages for two seconds each in
alternation.
▶Press (max. three times) to restart the product.
▶If you are unable to remedy the fault and the fault recurs
despite fault clearance attempts, contact customer ser-
vice.
10.2 Calling up and clearing the fault memory
The last 10 fault messages are stored in the fault memory.
▶Call up the installer level. (→Page 14)
▶Navigate to the fault codes.
◁The number of faults that have occurred is shown in
the display and the faults that are currently called up
are displayed with their fault numbers F.xx.
▶Press or to call up individual fault messages.
▶To delete the entire fault list, navigate to diagnostics code
D.094 in the installer level.
▶Set the diagnostics code to 1, and confirm by pressing
.
10.3 Resetting parameters to factory settings
1. Navigate to diagnostics code D.096 in the installer level.
2. Set the diagnostics code to 1, and confirm by pressing
.
10.4 Preparing the repair work
1. Decommission the product.
2. Disconnect the product from the power mains.
3. Remove the front casing.
4. Close the gas isolator cock.
5. Close the service valves in the heating flow and in the
heating return.
6. Close the service valve in the cold water pipe.
7. Drain the product if you want to replace water-bearing
components of the product.
8. Make sure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals and O-rings. Do not use any addi-
tional components.
10.5 Replacing defective components
10.5.1 Replacing the burner
1. Remove the gas-air mixture unit. (→Page 22)
2. Remove the burner seal.
3. Remove the burner.
4. Install the new burner complete with new seal on the
heat exchanger.
5. Install the gas-air mixture unit. (→Page 24)
10.5.2 Replacing the gas-air mixture unit
1. Remove the gas-air mixture unit. (→Page 22)
2. Install the new gas-air mixture (→Page 24).
10.5.3 Replacing the heat exchanger
1. Remove the side section. (→Page 9)
2. Remove the gas-air mixture unit. (→Page 22)

10 Troubleshooting
20 Installation and maintenance instructions ecoFIT pure 0020230535_01
E
1
2
D
B
C
A
3. Remove the flow pipe (1).
4. Remove the return pipe (2).
B
A
5. Remove the gas pipe.
B
3
4
A
6. Undo the clip underneath the condensate tray (4).
7. Undo the two screws (3).
A
5
C
B
8. Lift the heat exchanger up slightly and remove it to-
gether with the condensate tray.
9. Remove the ignition transformer (5).
10. Replace all the seals.
11. Install the new heat exchanger in reverse order.
10.5.4 Replacing the main PCB
C
C
D
B
A
A
1. Open the electronics box. (→Page 12)
2. Pull all of the plugs out from the PCB.
3. Undo the clips on the PCB.
4. Remove the PCB.
5. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
6. Plug in the PCB plugs.
7. Close the electronics box.