697430

Bosch Uni Condens 8000 F Handleiding

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6720867069 (2016/10) GB/IE
Operating instructions for users
Floor standing condensing boiler
Uni Condens 8000 F
UC8000F 800...1200 kW
Table of contents
Uni Condens 8000 F – 6720867069 (2016/10)
2
Table of contents 1 Explanation of symbols and safety instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimising danger are not taken.
The following signal words are defined and can be used in this document:
DANGER:
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING:
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION:
CAUTION indicates that minor to medium personal injury may occur.
NOTICE:
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is no risk to
people or property.
Additional symbols
Table 1
1.2 General safety instructions
H Instructions for the target group
These operating instructions are intended for the
heating system user.
All instructions must be observed. Failure to comply
with instructions may result in material damage and
personal injury, including possible loss of life.
▶ Read and retain the operating instructions (heat
source, heating controller, etc.) prior to operation.
▶ Observe the safety instructions and warnings.
1 Explanation of symbols and safety instructions . . . . . . . . . . . 2
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 2
2 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Determined use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Symbol at the boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.6 Permissible fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.7 Operation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.8 Requirements for the control unit . . . . . . . . . . . . . . . . . . 6
2.9 Burner requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Operation information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Combustion air quality. . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Water quality of the heating water. . . . . . . . . . . . . . . . . . 7
3.3 Using antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Making the heating system operational . . . . . . . . . . . . . 8
4.2 Commissioning the control unit and burner . . . . . . . . . . 8
5 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Shutting down the heating system.. . . . . . . . . . . . . . . . . 8
5.2 Shutting down the heating system in an
emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Inspection and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.2 Clean boiler casing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.3 Check and correct the operating pressure . . . . . . . . . . . 8
6.3.1 When should you check the operating pressure in
the heating system? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3.2 Sealed unvented systems . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3.3 Installations with automatic pressurisation units. . . . . . 9
6.3.4 Water samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Correct fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1 Correcting a burner fault . . . . . . . . . . . . . . . . . . . . . . . . 10
8.2 Other faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9 Environmental protection/disposal. . . . . . . . . . . . . . . . . . . . . 10
Symbol Meaning
▶ a step in an action sequence
a reference to a related part in the document
• a list entry
– a list entry (second level)
Explanation of symbols and safety instructions
3
Uni Condens 8000 F – 6720867069 (2016/10)
H General safety instructions
Failure to observe the safety instructions can result in
serious personal injury and a risk to life as well as
material losses and damage to the environment.
▶ Carry out service work at least once a year. As part
of this, check that the entire system is working
correctly. Defects must be remedied immediately.
▶ Never put your life at risk. Your own safety is
paramount.
▶ Before commissioning the heating system, read
these instructions carefully.
H Risk of damage from operating errors
Operator errors can result in personal injury and
material damage.
▶ Ensure that only personnel who can operate this
appliance correctly have access to it.
▶ Installation and commissioning as well as servicing
and maintenance must only be carried out by an
approved contractor.
▶ Only operate the system when it contains a
sufficient volume of water (operating pressure).
Operation without a sufficient volume of water is
not permitted.
H Safety of electrical devices for domestic use
and similar purposes
The following requirements apply in accordance with
EN 60335-1 in order to prevent hazards from
occurring when using electrical appliances:
“This appliance can be used by children of 8 years and
older, as well as by people with reduced physical,
sensory or mental capabilities or lacking in experience
and knowledge, if they are supervised and have been
given instruction in the safe use of the appliance and
understand the resulting dangers. Children shall not
play with the appliance. Cleaning and user
maintenance must not be performed by children
without supervision.”
“If the power cable is damaged, it must be replaced by
the manufacturer, its customer service department or
a similarly qualified person, so that risks are avoided.”
H Risk through oil leaks
If using oil as fuel, country-specific regulations hold
the operator responsible for asking a contractor to
correct any oil leaks the moment they are discovered.
H If you smell gas
▶ Close gas isolation valve.
▶ Open windows and doors
▶ Do not touch any electrical switch, telephone, and
do not use outlets.
▶ Extinguish any naked flames.
▶ Do not smoke!
▶ Do not use lighters!
▶ Warn all occupants in the building, but do not ring
doorbells.
▶ From outside the building, call your gas supplier
and licensed contractor.
H Danger if you smell flue gas
▶ Switch off the boiler.
▶ Open windows and doors
▶ Notify an approved contractor.
H Risk of electrical shock
Touching live parts can result in an electric shock.
▶ Do not open the product.
▶ Only have the electrical installation carried out by
qualified contractors.
H Installation, conversion and operation
Insufficient ventilation can lead to dangerous flue gas
leaks.
▶ Only have the boiler installed or modified by an
approved heating contractor.
▶ Never modify any parts for flue gas routing.
▶ Ensure that flue pipes and gaskets are not
damaged.
▶ With open flue mode: do not cover or reduce the
size of ventilation apertures in doors, windows or
walls.
▶ Adjustable ventilation flaps are not admissible and
must not be used for permanent ventilation.
▶ With mechanical ventilation, combustion must only
start when the supply air flap is fully open (volt free
checkback signal to the boiler controller via failsafe
limit switch). Provide for control of supply air flaps.
▶ Ensure that the boiler installation location remains
free from the risk of frost.
▶ The heating system must be installed and operated
according to the following laws and guidelines:
statutory ordinances, gas safety regulations, IEE
ordinance, building regulations, local water
ordinance, The Health and Safety at Work Act 1974
and all other local regulations. Chemically
aggressive substances can cause the device to rust,
which would invalidate any warranty claim.
Product Information
Uni Condens 8000 F – 6720867069 (2016/10)
4
H Combustion/room air
▶ Keep the combustion/ambient air free of corrosive
substances (e.g. halogenated hydrocarbons that
contain chlorine or fluorine compounds). This will
help to prevent corrosion.
▶ Keep the combustion air supply free of dust.
H Danger posed by explosive and easily
flammable materials
▶ Never use or store easily flammable materials (e.g.
paper, thinners, paints, etc.) near the appliance.
H Heating system damage due to frost
When the heating system is not in operation (e.g.
controller switched off, fault shutdown), there is a risk
of it freezing when there is frost.
▶ When shutting down or switching off for extended
periods, drain the heating and drinking water pipes
to the lowest point in order to protect the heating
system from freezing.
H Inspection and servicing
▶ Recommendation for customers: Arrange a
maintenance and inspection contract with an
approved contractor, covering an annual inspection
and responsive maintenance.
▶ The user is responsible for ensuring the heating
system is safe and environmentally compatible.
▶ Immediately correct all faults to prevent system
damage!
▶ Use only genuine spare parts from the
manufacturer. Losses caused by the use of spare
parts and accessories not supplied by the
manufacturer are excluded from the manufacturer's
warranty.
H Handover to the user
When handing over, instruct the user how to operate
the heating system and inform the user about its
operating conditions.
▶ Explain how to operate the heating system and draw
the user's attention to any safety relevant action
▶ Explain that conversions and repairs must only be
carried out by a competent person.
▶ Point out the need for inspections and maintenance
for safe and environmentally-compatible operation.
▶ Leave the installation instructions and the
operating instructions with the user for
safekeeping.
2 Product Information
2.1 Declaration of Conformity
The design and operation of this product comply with European
Directives and the supplementary national requirements. Conformity
has been demonstrated by the CE marking.
You can ask for a copy of the declaration of conformity for this product.
For this see the contact address on the back cover of these instructions.
2.2 Determined use
The Uni Condens 8000 F 800...1200 floor standing condensing boiler
has been designed for wet heating systems in (e.g. apartment buildings
or industrial applications).
The boiler is only approved for open-flue mode.
When installing and operating the heating system:
• Comply with standards, regulations and guidelines of the relevant
country.
• Observe the information on the data plate of the boiler.
2.3 Symbol at the boiler
2.4 Data plate
If you contact the manufacturer with any questions about this product,
always provide the details on the data plate. If we have these details, we
can quickly answer your specific query.
The details on the data plate are binding and must be observed!
You will find information such as the serial number, output and approval
details on the data plate.
2.5 Product Description
The Uni Condens 8000 F 800...1200 is a floor standing condensing
boiler with a slim, compact design and a small footprint, comprising a
combustion chamber located at the top and a condensation heating
surface located at the bottom.
With the Uni Condens 8000 F 800...1200 floor standing condensing
boilers, all parts that come into contact with products of combustion or
condensate are made from high grade stainless steel. This makes
operation possible without limitations on the flow and return
temperature, the flow rate or the burner low load.
The Uni Condens 8000 F 800...1200 is also referred to in this manual as
UC8000F 800...1200, boiler or heat source.
The boiler has two separate thermohydraulic return connections for the
high and low temperature heating circuits ( fig. 1, page 5).
The Uni Condens 8000 F 800...1200 must be equipped with a burner
that is suitable for the boiler.
The main components of the boiler are ( fig. 1, page 5):
• Boiler shell [1] in conjunction with a burner
The boiler block transfers the heat produced by the burner to the
heating water.
• Thermally insulating casing
The boiler shell and thermal insulation reduce energy losses.
• Control unit (accessory) [8]
The control unit monitors and controls all electrical boiler
components.
This symbol is used to point out that the installation and
operating instructions must be read prior to installation
operation or maintenance in order to prevent damage to the
system.
Product Information
5
Uni Condens 8000 F – 6720867069 (2016/10)
Fig. 1 Boiler overview
[1] Boiler shell
[2] Burner door
[3] Locking lug to secure the load during transportation
(not a lifting eye)
[4] Flue gas collector
[5] Condensate, siphon
[6] Drain
[7] Base frame rail
[8] Control unit (accessory)
[9] Cable conduit
[10] Flue gas connection
[11] Inspection aperture of condensation heating surface
[12] Port Return 1 (RK1) low temperature return (main return)
[13] Return connection 2 (RK2), high temperature return
[14] Inspection opening on the water side (both sides)
[15] Flow safety line
[16] Heating flow
[17] Boiler safety assembly (accessories)
[18] Lifting points
2.6 Permissible fuels
The boiler must only be operated with the specified fuels. Only burners
that are suitable for the specified fuels may be used.
Gas burner
The combustion of biogas is not permitted.
Permissible fuels:
• Natural gas from the public gas supply in accordance with national
regulations with a total sulphur content < 50 mg/m
3
• LPG in accordance with national regulations with a content of
elementary sulphur < 1.5 ppm and volatile sulphur < 50 ppm
0010014756-001
5
6
16
17
13
1412
11
10
3
4
2
1
3
7
8
9
18
15
Product Information
Uni Condens 8000 F – 6720867069 (2016/10)
6
Oil burner
Oil burners used must be suitable for low sulphur fuel oil. Observe the
manufacturer's oil burner selection list and the burner manufacturer's
instructions.
Permissible fuels:
• Low-sulphur extra-light fuel oil with a sulphur content < 50 ppm and
a proportion of bio-oil (FAME) ≤ 10 %.
Existing residual amounts of fuel oil with a sulphur content ≥ 50 ppm
must be pumped out and the oil tank cleaned.
Type tested dual burners can also be used. The requirements for the gas
side and the oil side described above also apply here. All products
subsequently described apply equally for the gas side and oil side.
2.7 Operation conditions
Observe the maximum rated heat input Qn (Hi) specified on the data
plate when setting the burner output.
Table 2 Operation conditions
Table 3 Operation conditions
It must be possible to check the number of burner starts, e.g. at the user
interface, third-party control unit, building control system or burner
control unit.
2.8 Requirements for the control unit
We recommend using a control unit from the CFB 800/CFB 900 or
CC 8000 series.
The purpose of optimum control unit settings is to achieve long burner
runtimes and avoid rapid temperature changes in the boiler. Gentle
temperature changes result in a longer service life of the heating system.
The control strategy of the control unit must therefore be prevented from
becoming ineffective, i.e. through the boiler temperature controller
switching the burner on and off.
Observe the following points when selecting the control unit.
• The control unit must ensure that the maximum internal boiler water
temperature and the high limit safety cut-out are at least 5 K apart.
• It must also be ensured that the control electronics rather than the
boiler temperature controller switch the burner on and off.
• The control unit must ensure that the burner is switched to low load
before a controlled shutdown. If this is not observed, the safety shut-
off valve (SAV) in the gas train may lock out.
• Select and adjust the control unit so as to allow a gentle start-up of
the boiler with a time delay when the system is cold. The heat energy
demand must only be switched on with time delay.
• After the burner demand, an automatic timer (for example) should
limit the burner to low load for a period of approx. 150 seconds. A
restricted heat demand will prevent uncontrolled starting and
stopping of the burner.
• It must be possible to show the number of burner starts at the control
unit used (or alternatively at the burner control unit).
• The maximum number of burner starts must be monitored. There
should be a maximum of 6 burner starts per hour (averaged over
burner runtime on one day). If the number of starts is higher, the user
should be notified. The system must be checked to find out whether
the number of burner starts can be reduced. The customer service of
the manufacturer can provide assistance with optimisation of the
system.
2.9 Burner requirements
Only use specified pressure-jet gas burners with floor standing gas
condensing boilers.
Use specified pressure-jet burners or dual fuel burners for floor standing
gas/oil condensing boilers.
The boiler must be equipped with a burner that is suitable for the boiler.
NOTICE:
System damage through the use of an incorrect burner.
▶ Only use burners which meet the technical boiler requirements.
Any pressure-jet gas burner type-tested to EN 676 can be used if its
operating range matches the boiler specifications. Oil burners type-
tested to EN 267 can be used if they have been approved by the
manufacturer for low sulphur fuel oil (s < 50 ppm) and if their operating
ranges match the specification of the boiler. Only burners that have been
tested and approved for electromagnetic compatibility (EMC) may be
used.
Operation conditions Unit Value
Maximal permissible temperature of
high limit safety cut-out /(STB)
°C 110
Maximum operating pressure bar Dependent on boiler
size
Maximum number of burner starts per
annum
15 000
Operation conditions Uni Condens 8000 F
800...1200 with
modulating
operation
Uni Condens 8000 F
800...1200 with
constant boiler
temperature
Volumetric flow rate None –
In conjunction with a
CFB/CC control unit
for modulating
operation (CFB 840;
CFB 810; CFB 830 or
CC 8311; CC 8312).
None
In conjunction with a
CFB/CC control unit
for constant boiler
temperature CFB 810
or CC 8312, or when
supplemented by a
third party control
unit.
Min. boiler water
temperature
Operating Interruption
(complete boiler shut-
down)
Heating circuit control
unit with heating mixer
Minimum return
temperature
Miscellaneous
1)2)
1) Maximum 15,000 burner starts per year. In order not to exceed the number of
burner starts, observe the information on setting the control unit and burner in
the technical guide or installation instructions. If this value is still however
exceeded, please contact the customer service of the manufacturer.
2) The number of burner starts per year is influenced by the boiler system's
operating settings (control parameters in the boiler control and the combustion
setting) and by the design of the boiler system with regard to the consumer's
heat requirement. To avoid exceeding the number of burner starts per year as a
result of operating settings that have not been optimised, the manufacturer
offers complete commissioning and regular system inspections for boilers,
burners and boiler controls (CFB/CC controllers with function modules).
1)
Operation information
7
Uni Condens 8000 F – 6720867069 (2016/10)
Furthermore, the following points must be observed when selecting
burner or burner control unit:
• Gas burners must be modulating and have modulating control.
• Oil burners used with boilers with an output of 70 kW or more must
be implemented as 2-stage burners and have at least a 2-stage
control.
• The control range of the burner at a boiler from an output of > 90 kW
must be at least 1:1.8 (i.e. the low load of the burner must not exceed
55%). The ignition load of the burner must also not exceed 55%.
• The burner control must ensure that the burner is switched to low
load before a controlled shutdown.
• The output of the burner must only be controlled by the control unit.
Automatic start up of the burner at full load following a burner
demand without taking the requested load into account is not
permitted!
Burner selection and settings
The sizing and settings of the burner have a significant influence on the
service life of the heating system. Every load cycle (burner on/off)
causes thermal stresses (loads on the boiler shell). The number of
burner starts must therefore not exceed 15,000 per year.
The purpose of the following recommendations and settings is to ensure
that this figure is not exceeded.
If this figure is however exceeded:
▶ Get in touch with the sales or customer service department of the
manufacturer.
It must be possible to check the number of burner starts, e.g. at the user
interface, third-party control unit, building control system or burner
control unit.
▶ Set the burner output as low as possible. Set the burner to the rated
heat input QN (Hi) specified on the data plate as a maximum.
Never overload the boiler!
▶ Take fluctuating net calorific values of the gas into account; check the
maximum value with the gas supply utility.
▶ Calculate the gas throughput at the burner based on the maximum
net calorific value and set accordingly at the burner.
▶ Only use burners that are suitable for the specified fuels.
▶ Ensure that the oil burner used is suitable for low sulphur fuel oil
(otherwise corrosion from metal dusting may occur). Observe the
burner manufacturer's instructions.
▶ Burners must only be adjusted by a contractor.
To be able to adjust the fuel throughput, install a fuel meter (gas and/or
oil flow meter) that can be checked even in the lower load range of the
burner. The fuel meter should be installed near the boiler and only
measure the quantity of fuel used by the corresponding boiler.
3 Operation information
When installing and operating the heating system:
▶ Observe country-specific standards, regulations and guidelines.
▶ Observe the information on the data plate of the boiler.
3.1 Combustion air quality
▶ To avoid corrosion, keep the supply of combustion air free of
corrosive substances (e.g. halogenated hydrocarbons that contain
chlorine or fluorine compounds).
▶ Never use or store chlorinated cleaning agents or halogenated
hydrocarbons (as contained in spray cans, solvents or cleaning
agents, paints and adhesives, for example) in the installation
location.
▶ Keep the combustion air supply free of dust.
▶ If building work is taking place in the installation location and creating
a lot of dust, shut the boiler down and cover it. A burner
contaminated during building work must be cleaned before
commissioning.
3.2 Water quality of the heating water
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
operational readiness of a heating system. If the system is filled with
water that has a high calcium hardness, this will be deposited on the heat
exchanger surfaces and will restrict the transfer of heat to the heating
water. As a result, the wall temperatures of the stainless steel heat
exchanger surfaces will rise and the thermal stresses will increase (loads
on the boiler shell).
The quality of the fill and top-up water must therefore satisfy the
specifications in the enclosed operator's log. The water quality must be
documented in the operator's log.
If the operator's log is not maintained or is missing, the warranty will be
invalidated.
If the operator's log is not included in the scope of delivery, contact the
address on the back of these instructions.
Water treatment must generally be carried out for boilers > 600 kW,
irrespective of water hardness and the fill and top-up water quantity.
3.3 Using antifreeze
Chemical additives that are not certified as harmless by the
manufacturer must not be used.
Antifreeze based on glycol has been used in heating systems for many
years, for example Antifrogen N manufactured by Clariant.
The use of other types of antifreeze should not be a cause for concern if
the product is comparable with Antifrogen N.
Observe the antifreeze manufacturer's instructions. Follow the
manufacturer's details regarding mixing ratios.
The specific thermal capacity of Antifrogen N antifreeze is lower than the
specific thermal capacity of water. To enable the transfer of the required
heat output, increase the required flow rate accordingly. This should be
taken into account when sizing the system components (e.g. pumps)
and the pipework.
As the heat transfer medium has a higher viscosity and density than
water, take the higher pressure drop through the pipework and other
system components into account.
Check the resistance of all plastic or non-metallic components in the
system separately.
Commissioning
Uni Condens 8000 F – 6720867069 (2016/10)
8
4 Commissioning
NOTICE:
Risk of boiler damage through contaminated combustion air!
▶ Never operate the boiler in very dusty conditions, e.g. if building work
is taking place at the installation location.
▶ Ensure adequate ventilation.
▶ Never use or store chlorinated cleaning agents or halogenated
hydrocarbons (as contained in spray cans, solvents or cleaning
agents, paints and adhesives, for example) at the installation
location.
▶ A burner contaminated during building work must be cleaned before
commissioning.
▶ Ask your contractor to provide information about how the boiler
works and is operated.
▶ Never undertake any modifications or maintenance.
4.1 Making the heating system operational
For you to be able to commission the heating system, observe the
following:
Open the automatic air vent valve only briefly for venting.
▶ Check that the required operating pressure has been established
( chapter 6.3, page 8).
▶ Check the flange connections and other connections for tightness.
▶ Fill the condensate siphon.
▶ Open the fuel supply to the main fuel shut-off valve.
▶ Switch on the heating system emergency stop switch.
4.2 Commissioning the control unit and burner
When commissioning the control unit, specific commissioning
parameters are set for the burner. The burner can then be started by the
control unit. For further information, refer to the operating instructions
of the relevant control unit or burner.
▶ Use the control unit to commission the boiler.
▶ Observe operating instructions of the control system and burner.
5 Shutdown
NOTICE:
Risk of damage to the system from frost!
When there is a frost, the heating system can freeze up if it is not
operational, (e.g. switched off, mains failure or fault shutdown)!
▶ Check the "Control unit settings" function to ensure the heating
system remains operational.
▶ When there is a risk of frost, protect your heating system against
freezing up.
▶ If your heating system has been shut down for several days, e.g. due
to a fault shutdown, and there is a risk of frost:
drain the heating water at the DFV. Also leave the air vent at the
highest point in the heating system open.
5.1 Shutting down the heating system.
The heating system is shut down via the control unit. The burner is also
automatically shut down.
▶ Switch off the burner at the control unit.
5.2 Shutting down the heating system in an emergency
Only switch off the heating system in emergencies via the boiler room
disconnector or the heating system emergency stop switch.
▶ Never put your life at risk. Your own safety is paramount.
▶ In dangerous situations, immediately close the main fuel shut-off
valve and the power supply of the heating system via the boiler room
main MCB/fuse or the heating system emergency stop switch.
▶ Isolate the fuel supply to the heating system.
6 Inspection and maintenance
6.1 General notes
NOTICE:
System damage due to inadequate cleaning and maintenance!
▶ Carry out cleaning and maintenance at least once a year. In the course
of this work, check the entire heating system including the
neutralising system for correct function.
▶ Immediately correct all faults to prevent system damage.
Annual inspection and service are part of the warranty terms.
▶ Conclude an annual inspection and responsive maintenance and
inspection contract with your contractor.
What makes regular maintenance important?
Heating systems should be regularly maintained for the following
reasons:
• To achieve a high level of efficiency
• To operate the heating system economically with low fuel
consumption
• To achieve a high level of operational reliability
• To maintain the cleanest possible combustion
6.2 Clean boiler casing
▶ Wipe down the boiler casing with a damp cloth.
▶ Never use aggressive or corrosive cleaning agents.
6.3 Check and correct the operating pressure
Operation without a sufficient volume of water is not permitted.
▶ Only operate the system when it contains a sufficient volume of water
(operating pressure).
If the operating pressure in the heating system is too low.
▶ Fill the heating system with top-up water.
For the water quality:
▶ Note the information specified in the operator's log.
▶ Check the operating pressure once a month.
Inspection and maintenance
9
Uni Condens 8000 F – 6720867069 (2016/10)
6.3.1 When should you check the operating pressure in the
heating system?
The fill and top-up water quality must comply with the specifications in
the operator's log supplied.
Air pockets may form in the heating system through the fill or top-up
water releasing gases.
▶ Vent the heating system (e.g. at the radiators).
▶ If required, top up with water.
Recently added fill or top-up water loses much of its volume in the first
few days because it releases gases.
With newly filled systems:
▶ Initially check the operating pressure of the heating water daily and
then in ever increasing intervals.
Once the heating system is hardly losing any volume:
▶ Check the operating pressure of the heating water once a month
A distinction is made between open and closed systems. In practice,
open vented systems are rarely installed nowadays. We will therefore be
using a closed heating system to demonstrate how you can check the
operating pressure. All settings will have already been made by the
contractor when the system was first commissioned.
6.3.2 Sealed unvented systems
NOTICE:
System damage due to frequent topping up!
Subject to the water quality, your heating system can be damaged
through corrosion or scaling.
▶ Ensure that the heating system is vented correctly.
▶ Check the heating system for leaks and the expansion vessel for
functionality.
▶ Observe the requirements regarding water quality
( operator's log).
▶ If water loss occurs frequently, locate the cause and rectify the
problem without delay.
NOTICE:
System damage due to temperature stresses!
▶ Only fill the heating system when cold (the flow temperature must not
exceed 40 °C).
▶ During operation, only fill the heating system via the filling facility in
the heating system pipework (return).
In closed systems, the pressure gauge needle ( fig. 2, [3], page 9)
must be within the green marking [2]. The red needle [1] of the pressure
gauge must be set to the minimum pressure required for the heating
system.
▶ Check the operating pressure of the heating system.
If the pressure gauge needle [3] drops below the green marking [2]:
▶ Top up with water.
▶ Top up with water via a filling facility in the heating system pipework.
▶ Remove air at the heating system.
▶ Check the operating pressure again.
Fig. 2 Pressure gauge for sealed unvented heating systems
[1] Red needle
[2] Green marking
[3] Pressure gauge needle
6.3.3 Installations with automatic pressurisation units
For installations in which an automatic pressure maintaining system is
integrated:
▶ Follow the manufacturers' instructions.
▶ Observe water quality requirements ( operator's log).
6.3.4 Water samples
The quality of the fill, top-up and boiler water must be regularly
documented in an operator's log.
▶ Have water samples taken by a contractor.
▶ Document result in operator's log.
6 720 648 053-30.1T
1
3
2
Correct fuel
Uni Condens 8000 F – 6720867069 (2016/10)
10
7 Correct fuel
CAUTION:
Physical injury or material damage due to use of unauthorised fuels.
Unauthorised fuels damage the floor standing boiler and can form
hazardous substances.
▶ Only use fuels approved by the manufacturer for this product.
We recommend you seek the advice of your heating contractor if you
intend to change the fuel for your heating system.
This heating system requires the correct fuel to ensure reliable
operation. During commissioning, your heating contractor will enter the
correct fuel type for your heating system in the table below.
Table 4 Fuel
8 Faults
8.1 Correcting a burner fault
NOTICE:
System damage due to frost.
When there is a frost, the heating system can freeze up if it is not
operational, e.g. switched off, mains failure or fault shutdown!
▶ Check the "Control unit settings" function to ensure the heating
system remains operational.
▶ When there is a risk of frost, protect your heating system against
freezing up.
▶ If your heating system has been shut down for several days, e.g. due
to a fault shutdown, and there is a risk of frost:
drain the heating water at the DFV. Also leave the air vent at the
highest point in the heating system open.
NOTICE:
System damage from pressing the reset button too frequently.
This can damage the burner ignition transformer.
▶ Press the reset button no more than three times in sequence.
The display shows a fault in the heating system. Further information on
the fault displays can be found in the service instructions of the relevant
control unit. In addition, burner faults are signalled by an indicator on the
burner.
▶ Press burner reset button (see operating instructions of burner and
control).
If the burner still fails to start after three attempts, contact a contractor.
8.2 Other faults
For other possible faults, see the installation and operating instructions
of the control unit.
9 Environmental protection/disposal
Environmental protection is a fundamental corporate strategy of the
Bosch Group.
The quality of our products, their economy and environmental safety are
all of equal importance to us and all environmental protection legislation
and regulations are strictly observed.
We use the best possible technology and materials for protecting the
environment taking account of economic considerations.
Packaging
Where packaging is concerned, we participate in country-specific
recycling processes that ensure optimum recycling.
All of our packaging materials are environmentally compatible and can be
recycled.
Used electrical and electronic appliances
Electrical or electronic devices that are no longer
serviceable must be collected separately and sent for
environmentally compatible recycling (in accordance with
the European Waste Electrical and Electronic Equipment
Directive).
To dispose of old electrical or electronic devices, you
should use the return and collection systems put in place in the country
concerned.
Batteries must not be disposed together with your household waste.
Used batteries must be disposed of in local collection systems.
Use the following fuel only:
Stamp/Signature/Date
Bosch Thermotechnik GmbH
Junkersstrasse 20-24
D-73249 Wernau
www.bosch-thermotechnology.com
… 10

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