Vaillant ecoCRAFT VKK GB SERIES User manual

For the owner
Operating manual
ecoCRAFT
Gas condensing boiler VKK GB 806/3-E-H
VKK GB 1206/3-E-H
VKK GB 1606/3-E-H
VKK GB 2006/3-E-H
VKK GB 2406/3-E-H
VKK GB 2806/3-E-H
GB

Operating manual ecoCRAFT 0020058717_032
Appliance characteristics
Vaillant ecoCRAFT appliances are gas-fired condensing
boilers.
1 Notes on the documentation
The following notes are intended as guidance through-
out the entire documentation.
Further documents apply in combination with this oper-
ating manual.
We accept no liability for any damage caused by fail-
ure to observe these instructions.
Other applicable documents
For the owner of the system:
Short operator's manual no. 0020063363
For the heating engineer:
Installation and maintenance
instructions no. 0020055744
Further instructions of all accessories and controllers
used also apply.
1.1 Storage of documents
Please store this operating manual and other applicable
documents where they are accessible at all times.
If the appliance is sold or given out, please hand over
the documents to the successor.
1.2 Symbols used
Please observe the safety instructions in this operating
manual for the operation of the appliance!
dDanger!
Immediate danger to life and limb!
eDanger!
Danger of death from electric shock!
HDanger!
Risk of burning or scalding!
aCaution!
Potentially dangerous situation for the product
and environment!
Contents
Appliance characteristics
Recommended accessories
Contents
Appliance characteristics........................................... 2
1 Notes on the documentation........................... 2
1.1 Storage of documents ............................................. 2
1.2 Symbols used ............................................................. 2
1.3 Validity of the instruction manual........................ 3
1.4 Identification plate.................................................... 3
1.5 CE label........................................................................ 3
2 Safety................................................................. 3
2.1 Action in case of emergency ................................. 3
2.2 Safety instructions ................................................... 3
2.3 Regulations................................................................. 5
2.3.1 Regulations (Great Britain and Eire).................... 5
3 Instructions for operation ............................... 5
3.1 Manufacturer's guarantee...................................... 5
3.2 Intended use............................................................... 5
3.3 Requirements of the installation site .................. 6
3.4 Care .............................................................................. 6
3.5 Recycling and disposal ............................................ 6
3.5.1 Appliance..................................................................... 6
3.5.2 Packaging.................................................................... 6
3.6 Energy saving tips .................................................... 6
4 Operation ........................................................... 8
4.1 Overview of the operating controls ..................... 8
4.2 Measures prior to commissioning......................... 9
4.2.1 Opening the isolating elements............................. 9
4.2.2 Checking system pressure...................................... 9
4.3 Start-up........................................................................ 10
4.4 Hot water preparation............................................. 10
4.4.1 Setting the hot water temperature......................10
4.4.2 Deactivating the storage tank mode .................. 11
4.4.3 Drawing off the hot water ...................................... 11
4.5 Setting for the heating mode ................................ 11
4.5.1 Setting the flow temperature
(no controller connected)....................................... 11
4.5.2 Setting the flow temperature
(using a controller)................................................... 11
4.5.3 Switching heating mode off (summer mode) .... 12
4.5.4 Adjusting the room thermostat or weather
compensator .............................................................. 12
4.6 Status displays........................................................... 12
4.7 Troubleshooting ........................................................ 13
4.7.1 Faults due to low water pressure......................... 13
4.7.2 Faults in ignition........................................................ 13
4.7.3 Faults in the air/flue gas routing.......................... 13
4.7.4 Filling the appliance/heating system................... 14
4.8 De-commissioning..................................................... 14
4.9 Frost protection......................................................... 14
4.9.1 Frost protection function........................................ 14
4.9.2 Frost prevention by means of draining............... 14
4.9.3 Maximum output measurements .......................... 15
4.10 Maintenance and Customer Service .................... 15
4.10.1 Maintenance............................................................... 15
4.11.2 Vaillant Service ........................................................... 15

3Operating manual ecoCRAFT 0020058717_03
Notes on the documentation 1
Safety 2
hNote
Useful information and instructions.
• Symbol for an important task
1.3 Validity of the instruction manual
This operating manual applies exclusively to units with
the following article numbers:
– VKK GB 806/3-E-H Art. No. 0010005410
– VKK GB 1206/3-E-H Art. No. 0010005411
– VKK GB 1606/3-E-H Art. No. 0010005412
– VKK GB 2006/3-E-H Art. No. 0010005413
– VKK GB 2406/3-E-H Art. No. 0010005414
– VKK GB 2806/3-E-H Art. No. 0010005415
The 10-digit part number for the equipment can be
found on the identification plate (see Fig. 1.1, read from
the 7th digit onwards).
1.4 Identification plate
The identification plate for the Vaillant ecoCRAFT is at-
tached to the rear of the boiler.
Serial-Nr. 21400400100054100006000000N0
Typ B23, B23P, C33, C43, C53, C63, C83, C93
GB, IE, cat. I2H
2H, G20 - 20 mbar
P(40/30°C) = 14,7 - 84,1 kW
P(60/40°C) = 14,1 - 80,4 kW
P(80/60°C) = 13,6 - 78,2 kW
Q = 15,5 - 88,8 kW GCV (Hs)
Q = 14,0 - 80,0 kW NCV (Hi
NOx class 5
Tmax = 85°C
PMS = 6 bar
V = 5,74 BED 92/42
****
CE-0063BS3986
VKK GB 806/3-E-H
ecoCRAFT
230 V~ 50 Hz 260 W IP 20
EAN-CODE
Read the instructions fully before installing or using the appliance!
The appliance must be installed in accordance with the manufacturer's
instructions and the regulations in force and only in a suitably ventilated
space!
Please observe the maintenance instructions as outlined in the instruction
manual!
0063 08
Vaillant GmbH Remscheid / Germany
1
2
3
5
4
Fig. 1.1 Identification plate
Key
1 Manufacturing No.
2 Model designation
3 Type approval designation
4 Specification of the unit
1.5 CE label
The CE label documents that the appliances as de-
scribed in the type overview satisfy the basic require-
ments of the following directives:
- Gas appliances directive (90/396/EEC)
- Electromagnetic compatibility directive with threshold
class B (2004/108/EEC)
- Low voltage directive (2006/95/EEC)
The appliances satisfy the basic requirements of the
Efficiency Directive (Directive 92/42/EWG of the Coun-
cil) as condensing boilers.
2 Safety
2.1 Action in case of emergency
dDanger!
If you smell gas!
Risk of poisoning and explosion due to a mal-
function!
Procedure in case of gas smell in buildings
• Open doors and windows wide, provide ventilation,
avoid rooms with gas smell!
• Avoid naked flames, do not smoke, do not use pocket
lighters!
• Do not use electric switches, plugs, bells, telephones
or other communication systems in the house!
• Turn off the gas supply.
• Close the gas stop cock on the appliance!
• Warn other building residents, but do not ring bells!
• Vacate the building!
• Inform the gas supply company stand-by service from
a telephone outside the building!
• If a gas leak is audible, leave the building immediately,
prevent others from entering the building and notify
the police and fire brigade from outside the building!
2.2 Safety instructions
Always observe the following safety instructions and
regulations.
dDanger!
Inflammable mixtures of gas and air may ex-
plode!
Do not use or store explosives or highly flam-
mable substances, such as petrol or paint, in
the same room as the unit.
Danger!
Risk of poisoning and explosion due to a mal-
function!
Never put the safety devices out of operation
or tamper with them so as to impair their func-
tion.

Operating manual ecoCRAFT 0020058717_034
• Do not make any alterations before:
- to the unit,
- around the unit,
- to the gas, air, water and electricity supply lines,
- to the expansion relief valve and drain line for the
heating water,
- to the flue gas pipes.
This also applies to alterations to structural elements in
the vicinity of the appliance which might affect its oper-
ational safety.
For example:
- Keep all openings for air and flue gas free.
aCaution!
Make sure, for example, that any temporary
covers used when performing work on the out-
side wall are removed.
For alterations to the appliance or to its environment,
you must refer to the recognised specialist company as
this is its responsibility.
aCaution!
Inappropriate alterations can cause damage!
Under no circumstances should you ever at-
tempt to make alterations to the gas fired con-
densing boiler or other parts of the system by
yourself.
Never try to carry out maintenance work or re-
pairs on the appliance yourself.
• Do not damage or remove seals on components. Only
suitably qualified heating engineers or our customer
service may remove sealed components.
HDanger!
Risk of scalding!
The water coming out of the tap can be very
hot.
aCaution!
Risk of damage!
Do not use sprays, solvents, chlorinated clean-
ing agents, paint, adhesives or similar sub-
stances in the vicinity of the appliance. Under
unfavourable conditions these substances can
cause corrosion, even in the flue system.
Installation and setting
The appliance may only be installed by a suitably quali-
fied heating engineer. This person also accepts respon-
sibility for proper installation and commissioning and
also for the observance of the existing rules, regulations
and directives.
The engineer is also responsible for inspection, mainte-
nance and repairs to the appliance, and alterations to
the gas volume setting.
aCaution!
The unit may only be operated
- for commissioning
- for test purposes
- for continuous operation
with the air/flue gas system fully assembled
and closed.
Otherwise, under unfavourable conditions, it
can result in material damage or even injury or
death.
Filling pressure of the heating system
Check the filling pressure of the heating system at regu-
lar intervals - see Section 4.7.4.
Emergency power supply
Your heating engineer connected your boiler to the
mains supply during installation.
If you wish to keep the unit ready for operation using an
emergency generating set in the event of a power fail-
ure, the technical specification of the unit (frequency,
voltage, earthing) must match the power mains, and
must correspond at least to the power consumption of
your unit. Contact your heating engineer for advice.
Frost protection
During frosty spells, ensure that the heating system re-
mains in operation and the rooms are warmed ade-
quately.
aCaution!
Risk of damage!
If there is a power cut or if the room tempera-
ture is set too low in individual rooms it can
not be ruled out that sections of the heating
system are damaged by frost.
Please always observe the instructions con-
cerning frost protection in Section 4.9.
2 Safety

5Operating manual ecoCRAFT 0020058717_03
2.3 Regulations
For installation of the appliance laws, regulations, tech-
nical rules and standards must be considered and ad-
hered to ensure the safe installation of your appliance.
2.3.1 Regulations (Great Britain and Eire)
Attention shall be made to the regulations, guidelines
and standards in force. In particular reference shall be
given to the following regulations, guidelines, standards
and rules:
- The electrical connections to the boiler MUST be in ac-
cordance with the I.E.E Wiring Regulations, and tested
accordingly.
- The Clean Air Act 1993 and the 3rd Edition of the
1956 Clean Air Act.
- The Building Regulations England and Wales, The
Building Standards Scotland and any requirements de-
termined by the local authorities within.
- Water supply (water fittings) regulations 1999
Detailed recommendations are also contained in the fol-
lowing documents:
BS 5854 Code of practice for flues and flue structures
in buildings.
BS EN 12828 Design for water-based heating systems.
BS 6644 Specification for Installation of gas-fired hot
water boilers of rated inputs between 70 kW
(net) and 1.8MW (net) (2nd and 3rd family
gases).
BS 6880 Code of practice for low temperature heating
systems of output greater than 45 kW.
Part 1 Fundamental and design considera-
tions.
Part 2 Selection of equipment.
Part 3 Installation, commissioning and main-
tenance.
BS 6981 Installation of low pressure gas pipework of
up to 28 mm in domestic premises.
BS 7074 Application selection and installation of ex-
pansion vessels and ancillary equipment for
sealed water systems.
Part 1 Code of practice for domestic heating
and hot water.
Part 2 Code of practice for low and medium
temperature hot water systems.
BS 6700 Specification for design, installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages.
Institute of Gas Engineers Publications
IGE/UP/1 Soundness testing and purging of industrial
and commercial gas installations.
IGE/UP/1A Soundness testing and purging of small low
pressure industrial and commercial natural
gas installations.
IGE/UP/10 Installation of gas appliances in industrial
and commercial premises.
Part 1 Flued appliances
3 Instructions for operation
3.1 Manufacturer's guarantee
Vaillant warranty
Vaillant provide a full parts and labour warranty for this
appliance.
The appliance must be installed by a suitably competent
person in accordance with the Gas Safety (Installation
and Use) Regulations 1998, and the manufacturer’s in-
structions. In the UK ‘CORGI’ registered installers under-
take the work in compliance with safe and satisfactory
standards.
All unvented domestic hot water cylinders must be in-
stalled by a competent person to the current building
regulations at the time of installation (G3).
Terms and conditions apply to the warranty, details of
which can be found on the warranty registration card in-
cluded with this appliance.
Failure to install and commission this appliance in com-
pliance with the manufacturer’s instructions may invali-
date the warranty (this does not affect the customer’s
statutory rights).
3.2 Intended use
Valliant ecoCRAFT gas-fired condensing boilers are
state-of-the-art appliances which have been constructed
in accordance with recognised safety regulations. Nev-
ertheless, there is still a risk of injury or death to the
user or others, or of damage to the appliance and other
property in the event of improper use or use for which it
is not intended.
The unit is not intended for use by persons (including
children) with reduced physical, sensory or mental capa-
bilities, or lack of experience and/or knowledge, unless
they are supervised or have been given instruction con-
cerning use of the unit by a person responsible for their
safety. Children must be supervised to ensure that they
do not play with the unit.
The units are intended as heat generators for closed
hot-water central heating installations and for central
hot water preparation. Any other use or use beyond
that specified shall be considered as improper use. The
manufacturer/supplier is not liable for any resulting
damage. The user alone bears the risk.
Intended use includes the observance of the operating
and installation manual and all other applicable docu-
ments, as well as adherence to the maintenance and in-
spection conditions.
aCaution!
Any improper use is forbidden.
Safety 2
Instructions for operation 3

Operating manual ecoCRAFT 0020058717_036
3.3 Requirements of the installation site
Vaillant ecoCRAFT gas-fired condensing boilers must be
installed in a boiler room.
Ask your heating engineer which national regulations
must be observed.
The entire installation site should be frost-proof.
Observe the specified frost protection measures in
Chapter 2 if you are unable to ensure this requirement.
hNote
It is not necessary to keep a clearance between
the appliance and combustible materials or
components, since at the rated heating power
of the appliance the temperature at the surface
of the housing is always lower than the maxi-
mum allowed temperature of 85 °C.
The minimum clearances for installation recommended
in the installation and maintenance manual should be
observed to ensure accessibility during maintenance
work.
3.4 Care
• Clean the casing of your unit with a damp cloth and a
little soap.
aCaution!
Risk of damage
Do not use scouring or cleaning agents which
might damage the casing, fittings or controls.
Do not use sprays, solvents or cleaning agents
containing chlorine.
3.5 Recycling and disposal
Both your Valliant ecoCRAFT gas-fired condensing boil-
er and its packaging consist mainly of recyclable raw
materials.
3.5.1 Appliance
Do not dispose of your Valliant ecoCRAFT gas-fired con-
densing boiler or any of its accessories with household
waste. Make sure the old appliance and any accessories
are disposed of properly.
3.5.2 Packaging
Leave the disposal of the transport packaging to the
qualified servicing company which installed the appli-
ance.
hNote
Observe the applicable national legal regula-
tions.
3.6 Energy saving tips
Installing a weather compensator
Weather compensators control the heating flow temper-
ature in response to the prevailing outside temperature.
No more heat is generated than is currently required. To
this end, the appropriate heating curve for the system
must be set on the weather-compensated controller. Al-
ternatively if there is a separate room thermostat
present, the room temperature can be set individually.
The correct setting is normally undertaken by the heat-
ing engineer. The required heating and set-back phases
(e.g. at night) are automatically switched on/off using
integrated timer programs. Owing to legal stipulations
concerning energy conservation, the use of weather-
compensated controllers and thermostatic valves
is specified.
Reducing the heating system
Reduce the room temperature during the hours of sleep
or periods of absence. This can be implemented most
simply and reliably by means of controllers with individ-
ually selectable timer programmes. At such times, set
the room temperature approx. 5 °C lower than during
full heating times. Reduction by more than 5 °C brings
no additional energy saving, because then increased
heating capacities would be needed for the next full
heating period. Reducing the temperature further is
only worthwhile for longer periods of absence, e.g. holi-
days, shut-downs. Take care in winter, however, that ad-
equate frost protection is maintained.
Room temperature
Only set the room/hall temperature high enough to en-
sure comfort. An extra degree would mean increased
energy consumption of about 6%. Adjust the room tem-
perature according to the specific use of the room. For
example, it is not normally necessary to heat rooms that
are seldom used to 20 °C.
Setting the operating mode
In warmer seasons, when the building/ apartments
needs no heating, we recommend switching the heating
to summer mode. The heating mode is then shut off,
however, the device or the plant remains ready for op-
eration for water heating.
Thermostat valves and room thermostat
Owing to legal stipulations concerning energy conserva-
tion, the use of thermostatic valves is specified.
Once set, they maintain the room temperature exactly.
Using thermostatic valves, the room temperature can be
customised to your requirements and economical opera-
tion of your heating system can be achieved.
And besides, the following user behaviour can frequent-
ly be observed: as soon as the room appears to get too
warm, the user goes and turns down the thermostatic
valve. If he feels too cold again after a while, he turns
the thermostatic valve up again. Such behaviour is not
3 Instructions for operation

7Operating manual ecoCRAFT 0020058717_03
only inconvenient, it is also completely unnecessary, for
a correctly functioning thermostatic valve will do all this
by itself: if the room temperature rises above the value
set on the sensor head, the thermostatic valve will close
automatically; when the temperature falls below the set
value it will open again.
Do not cover thermostatic valves
Do not cover the thermostatic valves with furniture,
drapes or similar objects. The room air must circulate
unhindered. Covered thermostat valves can be equipped
with remote sensors and thus still work.
Appropriate hot water temperature
The hot water should only be heated as much as is re-
quired for use. Any further heating will result in unnec-
essary energy consumption.
Energy-conscious use of water
Energy-conscious use of water can also reduce costs
considerably. e. g. showering instead of bathing: Where-
as approx. 150 liters of water are needed for a bathtub,
a shower equipped with modern, water-saving fittings
requires merely about a third of this volume. Besides: a
dripping tap wastes up to 2000 litres and a leaking cis-
tern up to 4000 litres of water in a year. On the other
hand, a new seal only costs a few pence.
Run circulation pumps only if needed
Circulation pumps facilitate the continuous circulation
of hot water through the piping system which means
that hot water is immediately available, also at more
distant draw-off points. These pumps undoubtedly en-
hance the convenience of the hot water generation
process. But they also need power. And circulating hot
water that is not used cools off when passing through
pipes and then needs to be reheated. Circulation pumps
should only be operated, therefore, when there is actu-
ally a general requirement for hot water. Using timer
switches, with which most circulation pumps can be
equipped or retrofitted, individual timer programmes
can be set. Weather compensators often have ancillary
functions for controlling circulation pump timings. Ask
your specialist company.
Airing the rooms
During the heating period, open windows only for venti-
lation and not for temperature regulation. A brief, high-
volume ventilation is more effective and energy-saving
than leaving a tilting window open for a long period. We
recommend that the windows be opened fully for a
short period. When ventilating the room, close all ther-
mostatic valves in the room or specify the minimum
temperature at the room thermostat (if installed). In this
way, there will be adequate ventilation without unneces-
sary cooling and energy loss (e.g. as a result of the
heating switching on during the ventilation procedure).
Instructions for operation 3

Operating manual ecoCRAFT 0020058717_038
4 Operation
4.1 Overview of the operating controls
1
9
8
7
6
5
2
3
4
Fig. 4.1 ecoCRAFT operating controls
To open the front panel, grip the recess and fold the
panel out. You can now see the controls with the follow-
ing functions (cp. Fig. 4.1):
1Display indicating the current heating flow tem-
perature, the filling pressure of the heating sys-
tem, the operating mode and other additional in-
formation
2Button "i" for calling up information
3Controller (accessory)
4Button for switching the unit on and off.
5"+" button for navigating forwards through the
display view (used by expert technician to speci-
fy settings and for troubleshooting) or for dis-
playing the cylinder temperature (with cylinder
sensor)
6"–" button for navigating backwards through the
display view (used by expert technician to speci-
fy settings and for troubleshooting) and for dis-
playing the filling pressure of the heating system
7"Reset" button for resetting the system in the
case of specific faults
8Rotary knob for setting the heating flow temper-
ature. When using with the VRC 430, 630 and
VRS 620, set to the clockwise end stop so that
the maximum flow temperature for the controller
will not be limited.
9Rotary knob for setting the storage tank temper-
ature (on units with the VIH domestic hot water
cylinder connected ). When using the VRC 430
for controlling the cylinder temperature, set the
knob to the clockwise end stop so that the work-
ing range of the hot water regulator in the
VRC 430 will not be restricted.
Digital Information and Analysis System (DIA)
11
12
Fig. 4.2 ecoCRAFT display
ecoCRAFT units are equipped with a Digital Information
and Analysis System. This system provides information
on the operating status of your appliance and helps you
deal with problems.
During normal operation, the display (1) shows the cur-
rent heating flow temperature (in this example 49 °C). If
a fault develops, an error code appears instead of the
temperature. In addition, your ecoCRAFT has a plain
text display which is used for displaying supplementary
information.
11 The current heating flow temperature, the heating
system filling pressure or a status or error code
12 Plain text display
You can also see the following information from
the symbols displayed:
Flue problem
Flue problem
Only in combination with the vrnetDIALOG:
As long as this symbol appears in the display, the
heating flow temperature and hot water outlet
temperature are specified by vrnetDIALOG (ac-
cessory), which means the unit operates at tem-
peratures other than those set using the rotary
knobs (8) and (9).
4 Operation

9Operating manual ecoCRAFT 0020058717_03
This operating mode can only be ended:
- via vrnetDIALOG or
- by altering the temperature setting on the rota-
ry knobs (8) or (9) by more than ± 5 K.
This operating mode can not be ended:
- by pressing the "Fault reset" button (7)
or
- by switching the unit on or off.
Heating mode active
permanently on: Heating operation
flashing: Burner anti-cycling time
active
Hot water generation active
permanently on: Cylinder charging mode
in standby
flashing: Domestic hot water cyl-
inder is being heated,
burner on
Internal heating pump is in operation
Actuating internal gas valve
Display of the instantaneous burner
modulation rate (bar graph display)
Flame with cross:
Fault during burner operation;
Unit is switched off
Flame without cross:
Burner operation normal
4.2 Measures prior to commissioning
4.2.1 Opening the isolating elements
hNote
The isolator devices are not included in the
scope of delivery for your unit. They are fitted
by your heating engineer on site. He must ex-
plain to you the position and handling of these
components.
4.2.2 Checking system pressure
1
Fig. 4.3 Checking the filling pressure of the heating system
• Check the filling pressure of the system during start-
up. To do this, press the "-" button; the system pres-
sure will be displayed instead of the current flow tem-
perature for approx. 5 seconds.
The filling pressure must lie between 1.0 and 2.0 bar
when the system is cold in order for the heating installa-
tion to operate properly. If the pressure is lower than
this, the water must be topped up before starting up
(see Section 4.7.4).
hNote
When the unit is in operation, you can have the
exact pressure shown in the display. Activate
the pressure display by pressing the "-" button
(1). After 5 seconds the display returns to the
flow temperature. You can also switch continu-
ously between the temperature and pressure in
the display by keeping the "-" button pressed
for roughly 5 seconds.
Note
To avoid running the system with too little
water and thus prevent damage, your appliance
has a pressure sensor. This signals the low
pressure level if the level falls below 0.6 bar by
the water pressure value in the display flash-
ing.
If the pressure falls below 0.3 bar, error mes-
sage F.22 (low water pressure) appears and the
burner is blocked. If the pressure falls below
0 bar or if it exceeds 9 bar (= defective sensor),
the Vaillant assured comfort mode is activated.
The output and the maximum possible flow
temperature are restricted. Status 40, alter-
nating with F22 (low water pressure) is dis-
played. In this case, please have the system re-
filled by your heating engineer.
If the heating system extends over several storeys, a
higher filling pressure may be required. Ask your engi-
neer for details.
Operation 4

Operating manual ecoCRAFT 0020058717_0310
4.3 Start-up
1
2
Fig. 4.4 Switching on the appliance
• Use the main switch (1) to switch the appliance on and
off:
1: "ON"
0: "OFF"
When you switch the unit on the display (2) shows the
current heating flow temperature.
To customise the settings in the unit, read Sections 4.4
and 4.5, where the options for the hot water generation
and heating mode settings are described.
aCaution!
Risk of damage!
The frost protection and monitoring systems
are only active if the main switch of the unit is
in the "I" position and the unit is connected to
the power mains.
To ensure that these protection devices remain active,
switch your gas-fired condensing boiler on and off using
the controller (see the corresponding operating manu-
al).
Section 4.9 describes how to take your gas-fired con-
densing boiler out of operation.
hNote
Immediately after switch-on, "Function Menu"
appears in the display. The Function Menu al-
lows the technician to perform functional
checks on the individual actuators. After a wait
of approx. 5s or if
the "-" button is pressed, the unit's electronics
switch to normal operation.
4.4 Hot water preparation
For hot water preparation, a Type VIH domestic hot
water cylinder must be connected to the boiler.
4.4.1 Setting the hot water temperature
2
3
Fig. 4.5 Setting the water temperature
• Switch on the appliance as described in section 4.3.
• Specify the storage temperature you require using the
corresponding rotary knob (3). In doing this:
- left hand end stop: frost protection 15 °C
- right hand end stop: max. 65 °C
hNote
When using a VRC 430, VRC 630 or VRS 620
the cylinder target temperature and the enable
times are set at the controller. The rotary knob
must be set to the clockwise limit stop so as
not to prevent operation of the controller.
When setting the desired temperature, the correspond-
ing target value is shown on the display (2).
After 3 seconds the display returns to standard mode
(the current heating flow temperature).
aCaution!
Risk of calcification!
If you live in a hard water area please consult
your water treatment specialist for advice.
dDanger!
For advice on the prevention of legionella
please consult the Heath and Safety Document
L8.
4 Operation