Read carefully prior to installation and maintenance.
Installation and maintenance instructions for contractors
Gas-fired condensing boiler
Logano plus GB402
6 720 820 700 (2018/01) GB
Table of Contents
Logano plus GB402 – 6 720 820 700 (2018/01)
2
Table of Contents
1 Key to symbols and safety instructions . . . . . . . . . . . . . . . . . . . 4
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Information on the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 EU Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Determined use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 About these instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Tools, materials and equipment . . . . . . . . . . . . . . . . . . . . 5
2.5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Dimensions and specifications . . . . . . . . . . . . . . . . . . . . . 8
2.7.1 Logano plus GB402 dimensions . . . . . . . . . . . . . . . . . . . 8
2.7.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.8 Product data for energy consumption . . . . . . . . . . . . . 11
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Standards, regulations and directives . . . . . . . . . . . . . 12
3.2 Notes on installation and operation . . . . . . . . . . . . . . . 12
3.3 Duty to obtain a permit and provide notification . . . . . 12
3.4 Installation location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 Quality of the heating water . . . . . . . . . . . . . . . . . . . . . 12
3.6 Pipework quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.7 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.8 Combustion air connection/flue connection . . . . . . . . 13
3.9 Combustion air quality . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.10 Validity of regulations . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Transporting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Transporting the boiler by crane/hoist . . . . . . . . . . . . 14
4.1.1 Lifting the boiler off the pallet . . . . . . . . . . . . . . . . . . . 14
4.2 Transporting the boiler on rollers . . . . . . . . . . . . . . . . . 14
5 Installing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Boiler room requirements . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Wall clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Floor-standing boiler levelling . . . . . . . . . . . . . . . . . . . 15
6 Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Establishing the flue gas connection . . . . . . . . . . . . . . 16
6.2 Installing the condensate hose . . . . . . . . . . . . . . . . . . . 17
6.3 Fitting the boiler cover . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4 Connecting the air supply
(for balanced flue operation) . . . . . . . . . . . . . . . . . . . . .18
6.5 Establishing the heating circuit connection . . . . . . . . . 19
6.5.1 Connecting the flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.5.2 Installing the safety assembly (on site) . . . . . . . . . . . . 19
6.5.3 Connecting the return . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.5.4 Installing a DHW cylinder . . . . . . . . . . . . . . . . . . . . . . . 20
6.6 Filling the heating system and checking for leaks . . . . 21
6.7 Making the electrical connection . . . . . . . . . . . . . . . . . 22
6.7.1 Fitting the control unit . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.7.2 Establishing the power supply connection . . . . . . . . . 22
6.8 Providing the fuel supply . . . . . . . . . . . . . . . . . . . . . . . 23
7 Start up the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1 Checking the operating pressure . . . . . . . . . . . . . . . . . 24
7.2 Checking for leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Recording gas parameters . . . . . . . . . . . . . . . . . . . . . . 25
7.4 Check the system equipment level . . . . . . . . . . . . . . . 25
7.5 Purging the gas line . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.6 Checking the ventilation and extract air apertures
and the flue connection . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.7 Making the heating system operational . . . . . . . . . . . . 26
7.8 Commissioning the control unit and burner . . . . . . . . 26
7.8.1 Switching on the boiler at the BC10 . . . . . . . . . . . . . . 26
7.8.2 Carrying out a flue gas test . . . . . . . . . . . . . . . . . . . . . . 26
7.8.3 Accessing the service level on the RC35 and
displaying monitoring data . . . . . . . . . . . . . . . . . . . . . . 27
7.9 Measuring the gas supply pressure and
static pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.10 Checking and adjusting the gas:air ratio . . . . . . . . . . . 28
7.10.1 Adjusting CO2 at full load (70-80 %) . . . . . . . . . . . . . . 28
7.10.2 Setting and checking the CO2 values under
partial load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.10.3 Checking the CO2 setting under full load (70-80 %) . 29
7.11 Switching the status display on the BC 10 to show
the boiler temperature status . . . . . . . . . . . . . . . . . . . . 29
7.12 Returning to operating mode from the flue gas test . . 29
7.13 Recording actual values . . . . . . . . . . . . . . . . . . . . . . . . 29
7.13.1 Feed pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.13.2 Negative pressure in the supply air duct in
open-flue mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.13.3 CO value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.14 Function tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.14.1 Checking the ionisation current (flame current) . . . . . 30
7.15 Check for water leaks during operation . . . . . . . . . . . . 30
7.16 Installing casing parts . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.17 Informing the user, handing over technical documents 30
7.18 Commissioning report . . . . . . . . . . . . . . . . . . . . . . . . . 31
8 Shutting down the heating system. . . . . . . . . . . . . . . . . . . . . 32
8.1 Shutting down the heating system via the control unit 32
8.2 Shutting down the heating system in an emergency . . 32
9 Environment / disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table of Contents
Logano plus GB402 – 6 720 820 700 (2018/01)
3
10 Inspection and servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.1 Preparing the boiler for inspection . . . . . . . . . . . . . . . . 32
10.2 General work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.3 Internal leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.3.1 Determining the test volume . . . . . . . . . . . . . . . . . . . . . 33
10.3.2 Carrying out a leak test . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.4 Checking the heating system operating pressure . . . . 35
10.5 Measuring carbon dioxide content . . . . . . . . . . . . . . . . 35
10.6 Clean burner and heat exchanger . . . . . . . . . . . . . . . . . 35
10.6.1 Removing and cleaning burner . . . . . . . . . . . . . . . . . . . 36
10.6.2 Clean heat-exchangers . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.7 Inspecting the burner electrodes . . . . . . . . . . . . . . . . . 39
10.8 Replacing components . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.8.1 Removing the gas valve . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.8.2 Changing the gas filter . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.8.3 Removing the fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.9 Refitting detached parts . . . . . . . . . . . . . . . . . . . . . . . . 41
10.9.1 Fitting the fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.9.2 Fitting the ventilation air collector and the gas valve . . 41
10.9.3 Fitting the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.9.4 Fitting the gas line to the gas valve . . . . . . . . . . . . . . . . 42
10.9.5 Fitting the ventilation air unit . . . . . . . . . . . . . . . . . . . . 42
10.10 Check for water leaks during operation . . . . . . . . . . . . 42
10.11 Checking the ionisation current . . . . . . . . . . . . . . . . . . 42
10.12 Completing inspection and maintenance . . . . . . . . . . . 42
10.12.1Removing meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10.12.2Installing casing parts . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10.12.3Checking the gas/air ratio . . . . . . . . . . . . . . . . . . . . . . . 42
10.12.4Confirming inspection and maintenance . . . . . . . . . . . 42
10.13 Replacing the gaskets subject to time in use . . . . . . . . 42
10.14 Inspection and maintenance reports . . . . . . . . . . . . . . 43
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11.1 Recognising the operating condition and
clearing faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
11.2 Emergency mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11.3 Operating and fault displays . . . . . . . . . . . . . . . . . . . . . 47
11.3.1 Operating messages of the controller . . . . . . . . . . . . . 47
11.3.2 Control unit fault displays . . . . . . . . . . . . . . . . . . . . . . . 48
11.3.3 Status indicator of the burner control unit. . . . . . . . . . 55
12 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.1 Sensor curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.1.1 Temperature sensor at the burner control unit . . . . . . 56
12.2 Hydraulic resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.3 Connecting diagram MC10 . . . . . . . . . . . . . . . . . . . . . . 56
12.4 SAFe connection diagram . . . . . . . . . . . . . . . . . . . . . . . 59
12.5 Conversion of vol. – % CO2 into vol. – % O2 for
burner setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Keyword index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
1 Key to symbols and safety instructions
Logano plus GB402 – 6 720 820 700 (2018/01)
4
1 Key to symbols and safety instructions
1.1 Explanation of symbols
Warnings
Keywords at the start of a warning indicate the type and severity of the
ensuing risk, if measures to prevent the risk are not taken.
• NOTICE indicates that material damage may occur.
• CAUTION indicates that minor to medium personal injury may occur.
• WARNING indicates that severe personal injury may occur.
• DANGER indicates that life-threatening personal injury may occur.
Important information
Additional symbols
1.2 Safety precautions
If you smell gas
▶ Close gas isolation valve.
▶ Open windows and doors.
▶ Never operate electrical switches, including telephones, plugs or
doorbells.
▶ Extinguish any naked flames. Do not smoke! Never use any lighters or
sources of ignition of any kind!
▶ Warn all occupants in the building, but do not ring doorbells.
▶ If you can actually hear gas escaping, leave the building immediately.
Prevent third parties from entering and notify police and fire brigade
from outside the building.
▶ From outside the building, call your gas supplier and licensed
contractor.
Danger if you smell flue gas
▶ Switch off the boiler ( page 32).
▶ Open windows and doors.
▶ Notify an approved contractor.
Danger of poisoning. Insufficient ventilation can lead to dangerous
flue gas leaks.
▶ Never block ventilation and extract air apertures or reduce their size.
▶ The boiler must not be operated, unless you immediately remedy the
fault.
▶ Inform the system user in writing of the problem and associated
danger.
Danger of escaping gases
▶ Ensure that the flue pipes and gaskets are not damaged.
▶ Ensure that the boiler is not equipped with a ventilation air damper or
a thermostatic shut-off damper downstream of the flue connection.
Danger of explosion of flammable gases
▶ Any work on components that carry gas may only be carried out by a
licensed contractor.
Danger posed by explosive and easily flammable materials
▶ Never use or store easily flammable materials (paper, curtains,
clothing, thinners, paints, etc.) in the vicinity of the boiler.
Danger through electric shock when the boiler is open
▶ Before opening up the boiler, isolate it completely from the mains
power supply and ensure the power cannot be inadvertently
reconnected.
▶ It is not enough to switch off the control unit.
Danger through short circuits
To prevent short circuits:
▶ Only use original Buderus cables.
Siting and adjustment
▶ Correct and proper installation and adjustment of the burner and the
control unit are the fundamental requirements for safe and
economical operation of the boiler.
▶ Only permit an authorised contractor to install the boiler.
▶ Never modify any parts for flue gas routing.
▶ Work on components in contact with gas must only be carried out by
certified gas fitters.
▶ Electrical work must only be carried out by qualified electricians.
▶ Boilers must be installed in a separate installation location which is
not normally occupied by persons.
▶ Do not cover or reduce the size of ventilation apertures in doors,
windows and walls. If draught-proof windows are fitted, ensure there
is an adequate supply of combustion air.
▶ Observe all the other applicable technical documentation for other
system components, accessories and spare parts.
▶ Never shut off safety valves!
Water may escape from the safety valve for the hot water system and
piping when the water is being heated.
Risk of damage due to operator error
Operator errors can result in personal injury and material damage.
▶ Ensure that children never operate this appliance unsupervised or
play with it.
▶ Ensure that only personnel who can operate this appliance correctly
have access to it.
Instructing the customer
▶ Explain to the customer how the boiler works and how to operate it.
▶ The user is responsible for the safety and environmental compliance
of the heating system (Federal Immission Act [Germany]).
▶ Inform customers that they must not carry out any modifications or
repairs.
▶ Maintenance and repairs may only be carried out by an authorised
contractor.
▶ Only use genuine spare parts!
▶ Any other combinations, accessories and wearing parts may only be
used if these are specifically designed for the application and impair
neither the performance characteristics nor the safety requirements.
Warnings in this document are framed and identified by
a warning triangle printed against a grey background.
Important information where there is no risk to people or
property is indicated with the adjacent symbol. It is
bordered by lines above and below the text.
Icon Means
▶ Action step
Cross-reference to other parts of this document or to
other documents
• List/list entry
– List/list entry (second level)
Table 1
2 Information on the device
Logano plus GB402 – 6 720 820 700 (2018/01)
5
2 Information on the device
2.1 EU Declaration of Conformity
This product, in design and operation, conforms to the European
Directives and supplementary national requirements. Compliance is
demonstrated by the CE marking. You may request the declaration of
conformity for the product. Please refer to the contact address on the
back cover of these instructions.
2.2 Determined use
The Logano plus GB402 is designed for conventional use as a gas
condensing boiler for DHW and central heating.
Only gas supplied by the public gas supplier can be used.
Observe the details on the data plate and the specification
( Chapter 2.7, page 8) to ensure correct use.
2.3 About these instructions
These installation and maintenance instructions contain important
information for the safe and appropriate installation, commissioning and
servicing of this gas condensing boiler.
These installation and maintenance instructions as well as the service
instructions are designed for contractors who, through their technical
training and experience, are knowledgeable in handling heating systems
and gas installations.
The following documents are available for the Logano plus GB402:
• Ower’s manual
• Operating instructions, MC10 control unit
• Installation and Maintenance Instructions
• Operator’s log
• Technical guide
The above documents are also available for downloading via the Buderus
website.
Please contact us with suggestions for improvement or if you notice any
errors. For contact addresses and our internet address, see the back
cover of this document.
2.4 Tools, materials and equipment
For boiler installation and maintenance you will need the following:
• Standard tools used for central heating, gas and water installation,
plus set of a metric open-ended spanners and Allen keys.
• The RC35 programming unit as a monitoring device for
commissioning, inspecting and servicing the boiler.
The following may also prove useful:
• 5 pipes (approx. R 1¼ ", approx. 900 mm long) as supports on which
to roll the boiler into place
• Cleaning blade and/or chemical cleaning agent for wet cleaning
(available as accessories)
Approval data
Product ID number CE-0085BU0332
Table 2 Approval data
A PC with Buderus Logamatic ECO-Soft4000/EMS and a
service key can also be used as a monitoring device.
2 Information on the device
Logano plus GB402 – 6 720 820 700 (2018/01)
6
2.5 Product Description
The Logano plus GB402 is a gas condensing boiler with an aluminium
heat exchanger.
Fig. 1 Logano plus GB402 - main components
[1] Boiler front panel
[2] Gas valve
[3] Control unit (MC10 and BC10)
[4] Gas burner (burner rod)
[5] Boiler block with thermal insulation
[6] Boiler casing
[7] Condensate pan and siphon
[8] Burner control unit
The main components of the Logano plus GB402 ( Fig. 1) are:
• Control unit
• Appliance frame and casing
• Boiler block with thermal insulation
• Gas burner
The control unit monitors and controls all electrical boiler components.
The boiler block transfers the heat generated by the burner to the
heating water. The thermal insulation reduces the radiation and standby
losses.
2 Information on the device
Logano plus GB402 – 6 720 820 700 (2018/01)
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Fig. 2 Logamatic BC10 basic controller - control elements
[1] "ON/OFF" switch
[2] Set DHW temperature rotary selector
[3] "DHW heating" LED
[4] Status display
[5] Maximum boiler temperature rotary selector
[6] "DHW demand" LED
[7] Base plate with a slot for a programming unit, e.g. RC35 (behind
the fascia)
[8] "Burner" (ON/OFF) LED
[9] Connection socket for diagnostic plug
[10] "Status display" key
[11] "Flue gas test" key
[12] "Reset" key (fault release button)
Logamatic BC10 basic controller ( Fig. 2).
The Logamatic BC10 basic controller provides control over the standard
functions of the heating system. It provides functions including the
following:
• Switching the heating system on/off
• Setting the DHW temperature and maximum boiler water
temperature in heating mode
• Status indication lamp
Figure 2 provides an overview of the control elements of the Logamatic
BC10 basic controller.
Programming units (such as the RC35*) offer many additional functions
for the convenient control of your heating system.
* available separately
2.6 Scope of delivery
The Logano plus GB402 is supplied as standard with a Logamatic BC10
basic controller and the MC10 control unit in 3 separate packages.
▶ Upon receipt check that all packaging is in perfect condition.
▶ Check the scope of delivery for completeness.
▶ Dispose of packaging in an environmentally responsible manner.
ACCESSORIES
Many individual accessories are available for this boiler.
For details regarding suitable accessories, see the catalogue.
The following accessories are available from your local sales office:
• Safety valve or safety assembly
• Exhaust system
• Supply air system
• User interface, e.g. RC35
• Silencer
• Ventilation air adaptor (accessory for balanced flue operation)
9
6720614021-03.2RS
2 4 5
12 10 8
11 71
3
6
Packed unit Component Packaging
1 (boiler) Assembled boiler
(excluding casing)
1 shrink-wrap package
on a pallet
Siphon 1 shrink-wrap package
Foot bolts 1 shrink-wrap package
Boiler flue connection 1 carton
Label for gas type
conversion
1 shrink-wrap package
Technical documents 1 shrink-wrap package
2 (separate) Casing 1 carton
3 (separate) MC10 control unit
(includingBC10)
1 carton
Table 3 Scope of delivery
2 Information on the device
Logano plus GB402 – 6 720 820 700 (2018/01)
8
2.7 Dimensions and specifications
2.7.1 Logano plus GB402 dimensions
Fig. 3 Dimensions and connections for the Logano plus GB402 (dimensions in mm)
AA Flue outlet
AKO Condensate outlet
EV Combustion air pipe inlet (balanced flue operation only,
corresponding connections are available as accessories)
GAS Gas Supply
MAG Optional connection for a diaphragm expansion vessel to protect
a single boiler
RK Boiler return
ST Connection for safety valve or safety assembly
VK Boiler flow
min. 90
max. 7
Ø 250
+0,3
+0,7
Y
Y
Ø 201
max. 7
+1,2
-0
min. 8
min. 90
Ø 200 ±0,5
max. 7
min. 90
max. 30
6 720 618 585-16.4T
0
EN 1506
d=200
2 Information on the device
Logano plus GB402 – 6 720 820 700 (2018/01)
9
2.7.2 Specifications
Boiler size (output - no. of sections)
Unit GB402-320 - 5 GB402-395 - 6 GB402-470 - 7 GB402-545 - 8 GB402-620 - 9
Rated heat input [Qn (Hi)]
1)
kW 61.0 – 304.8 75.2 – 376.2 89.5 – 447.6 103.8 – 519.0 118.0 – 590.0
Rated output [Pn 80/60]
1)
Temperature pairing 80/60 °C
kW 58.9 – 297.2 72,6 – 367,4 85.2 – 435.8 100,7 – 507,0 114,9 – 578,2
Rated output [Pn 50/30]
1)
Temperature pairing 50/30 °C
kW 66,7 – 320,0 80,5 – 395,0 95,6 – 468,2 113,0 – 545,0 127,6 – 621,4
Boiler efficiency, maximum performance
at 80/60 °C
% 97.5 97.6 97.3 97.7 98.0
Boiler efficiency, maximum performance
at 50/30 °C
% 105.1 105.0 104.6 105.0 105.3
Seasonal efficiency [to DIN], heating curve 75/60 °C % 106.0 106.3 106.6 106.3 106.4
Seasonal efficiency [to DIN], heating curve 40/30 °C % 109.6 109.4 109.7 109.3 110.4
Standby heat loss at excess temperature 30/50 K % 0.20/0.33 0.16/0.27 0.14/0.23 0.12/0.20 0.11/0.17
Heating water circuit
Boiler water content [V]
1)
I 47.3 53.3 59.3 65.3 75.3
Pressure drop on the heating water side at 20 K mbar 99 105 95 108 113
Maximum flow temperature heating/DHW mode °C 30 – 85
Safety limit/high limit safety cut-out [T
max
]
1)
°C 100
Maximum permissible operating pressure [PMS]
1)
bar 6
Maximum differential between flow
and return temperatures
Full Load K 30 30 30 30 30
Partial load K 40 40 40 40 40
Maximum permitted flow rate through the
boiler
2)
l/h 34400 42463 50525 58588 66650
Pipework connections
Gas connection inch 2
Heating water connection DN/mm 80
Condensate connection inch ¾ "
Flue gas values
Exhaust connection mm 250
Volume of condensate for natural gas G20, 40/30 °C l/h 30.8 39.2 46.2 55.9 64.7
Exit flue gas mass flow Full Load g/s 142.4 174.5 207.1 240.6 271.9
Partial load g/s 28.7 36.8 40.6 48.0 53.2
Flue gas temperature 50/30 °C Full Load °C 45 44 44 43 44
Partial load °C 30
Flue gas temperature 80/60 °C Full Load °C 65
Partial load °C 57 58 58 58 58
CO
2
value, natural gas Full Load % 9.1
Partial load % 9.3
Standard CO emissions factor mg/kWh 20
Standard NO
x
emissions factor mg/kWh 40
Fan for residual pressure differential
(flue gas and combustion air system)
Pa 100
Exhaust system
Temperature classification to be used
for flue system in accordance with EN 1443
min. T120 min. T120 min. T120 min. T120 min. T120
Pressure classification to be used
for flue in accordance with EN 1443
H1,
P1
H1,
P1
H1,
P1
H1,
P1
H1,
P1
Pressure classification to be used
for connection piece in accordance with EN 1443
H1,
P1 with additional mechanical impact stability up to 5000 Pa
Condensate resistance classification to be used for
flue system in accordance with EN 1443
WWWWW
Corrosion resistance classification to be used
for flue system in accordance with EN 1443
Min. 2 Min. 2 Min. 2 Min. 2 Min. 2
Table 4 Specifications
2 Information on the device
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10
Soot combustion resistance classification to be used
for flue system in accordance with EN 1443
G, O G, O G, O G, O G, O
Maximum permitted flue gas return flow under wind
conditions
%1010101010
Maximum permitted combustion air temperature °C 35 35 35 35 35
Type (according to DVGW regulations) Open flue operation: B
23
, B
23P
Balanced flue operation: C
13
, C
33
, C
43
, C
53,
C
63
, C
83
, C
93
Type (Belgium and Netherlands) Open flue operation: B
23
, (B
23P
only valid for Belgium)
Balanced flue operation: C
13
, C
33
, C
43
, C
53,
(C
63
only valid for the Netherlands),
C
83
, C
93
Electrical details
IP rating - IPX0D
Supply voltage/frequency V/Hz 230/50
Electric consumption power
[P(el)]
1)
Full Load W 418 449 487 588 734
Partial load W 39 45 42 45 49
Protection against electrocution Safety category 1
Maximum permissible unit fuse protection A 10
Appliance dimensions and weight
Handling dimensions width × depth × height mm 781 x 1740 x 1542
Weight (excl. casing) kg 410 438 465 493 520
1) The details [xxx] correspond to the symbols and formula signs used on the type plate.
2) Is to be ensured by means of system sizing, and it corresponds to a minimum differential between flow and return temperatures of 8 K.
Boiler size (output - no. of sections)
Unit GB402-320 - 5 GB402-395 - 6 GB402-470 - 7 GB402-545 - 8 GB402-620 - 9
Table 4 Specifications
Boiler size
Natural gas E, H, Es
(G20)
Natural gas L (DE)
Natural gas LL, L, Ei
(G25)
Natural gas Lw (G27)
(PL)
Natural gas S (G25.1)
(HU)
Wobbe index
14.9 kWh/m
3 1)
Wobbe index
12.8 kWh/m
3
1)
Wobbe index
12.2 kWh/m
3 1)
Wobbe index
11.4 kWh/m
3 1)
Wobbe index
11.5 kWh/m
3 1)
Gas throughput Gas throughput Gas throughput Gas throughput Gas throughput
[m
3
/h] [m
3
/h] [m
3
/h] [m
3
/h] [m
3
/h]
320 -5 32.3 34.3 37.6 – –
395 -6 39.8 42.4 46.4 48.5 46.2
470 -7 47.4 50.4 55.2 57.8 55.0
545 -8 55.0 58.4 64.0 67.1 63.9
620 -9 62.5 66.5 72.8 76.2 72.6
Table 5 Gas throughput (relative to 15 °C gas temperature and 1013 mbar air pressure)
1) Upper Wobbe index for 0 °C, 1013 mbar
Country Boiler size
Nominal gas
pressure [mbar]
Gas category
Gas family, gas group and reference gas
set on delivery
Set to rated gas pressure on
delivery [mbar]
1)
EN 320-620 20 I
2ELL
2E, G20 20
AT, BY, CH, CZ,
DK, EE, ES, GB,
HR, IE, IT, LT, LV,
PT, RO, RS, RU,
SI, SK, TR, UA
320-620 20 I
2H
2H, G20 20
Table 6 Country-specific gas categories and supply pressures
2 Information on the device
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2.8 Product data for energy consumption
The product data on energy consumption can be found in the operating
instructions for the user.
FR 320-620 20/25 I
2Esi
2)
2Es
2)
, G20 20
BE 320-620 20/25 I
2E(R)
2Es
2)
,G20 20
FR 320-620 20/25 I
2Esi
2)
2Ei
2)
, G25
3)
25
LU 320-620 20 I
2E
2E, G20 20
NL 320-620 25 I
2L
2L, G25 25
PL 320 20 I
2E
2E, G20 20
PL 395-620 20 I
2ELw
2E, G20 20
HU 320 25 I
2H
2H, G20 25
HU 395-620 25 I
2HS
2H, G20 25
EN 320-620 20 I
2ELL
2LL, G25
3)
20
1) The gas supplier must ensure the minimum and maximum pressures (in accordance with national regulations for public gas supply).
2) Es and Ei are sub-groups of gas group E.
3) Gas group LL for Germany and subarea Ei of gas group E for France are supplied with a setting for an upper Wobbe index of 12.8 kWh/m3 for 0 °C, 1013 mbar. This
corresponds to the average standard supply for areas supplied with gas group LL and lies at the upper limit of subarea Ei of gas group E. This should prevent overload settings
from being made inadvertently and is designed to facilitate commissioning.
Country Boiler size
Nominal gas
pressure [mbar]
Gas category
Gas family, gas group and reference gas
set on delivery
Set to rated gas pressure on
delivery [mbar]
1)
Table 6 Country-specific gas categories and supply pressures
If the boiler is to be replaced in existing systems:
▶ Consult gas suppliers to ensure that the nominal gas
pressure according to table 6 (country-specific gas
category and supply pressures) is adhered to.
3 Regulations
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3 Regulations
In order to ensure installation and operation of the product in
accordance with regulations, please observe all the applicable national
and regional regulations as well as all technical rules and guidelines.
The electronically available document 6720807972 contains
information about the applicable regulations. You can use the document
search on our website to display these. You will find the website address
on the back cover of these instructions.
3.1 Standards, regulations and directives
3.2 Notes on installation and operation
When installing and operating the heating system observe the following:
• local building regulations regarding the installation conditions
• local building regulations regarding ventilation and extract air
systems and the chimney connection
• regulations regarding connection to the power supply
• technical rules of the gas supplier regarding the connection of the gas
burner to the public mains gas supply.
• Regulations and standards regarding the safety equipment level of
water-filled heating systems.
The following also applies in Switzerland:
The boilers have been tested and approved by the SVGW in accordance
with the requirements of the Clean Air Regulation (LRV, Appendix 4) and
the Fire Safety Regulations Guide from the VKF. During installation,
observe the guidelines for installing and operating combustion
equipment G3 d/f, the gas guidelines G1 from the SVGW, and local fire
safety regulations in force within the canton.
In Austria, the guidelines G 1 (ÖVGW TR-Gas) and the regional building
regulations must be observed during installation. The requirements
concerning safety measures for small-scale combustion equipment
(emissions) and energy saving measures (efficiency levels) according to
Art. 15a B-VG have been met, as have the ordinances used to implement
these requirements at a local level.
The following is to be observed for Belgium:
• Stipulations of the Belgian Royal Decree of 17/07/2009 (maximum
CO value with 100% burner load = 110 mg/kWh and NOx <
70 mg/kWh; see Declaration of Conformity).
• NBN D 51-003 - Internal lines for natural gas and positioning of the
consumer units - General regulations
• NBN B 61-001 - Boiler rooms and chimneys: Boilers with a power
rating of 70 kW or higher - Regulations for the installation room, the
air supply and flue gas extraction.
3.3 Duty to obtain a permit and provide notification
▶ The local gas supplier must be notified of and approve the gas boiler
installation.
▶ Please note that regional approvals may be required for the flue
system and the connection of the condensate outlet to the public
sewerage system.
▶ Prior to commencing installation, inform the local flue gas inspector
(where appropriate) and water authority.
3.4 Installation location
3.5 Quality of the heating water
As pure water cannot be used for heat transfer, water quality is
important. Poor water quality can damage heating systems due to scale
formation and corrosion.
3.6 Pipework quality
When using plastic pipes in the heating system, for example in
underfloor heating systems, ensure these are impermeable to oxygen. If
the plastic pipes do not comply with these standards, they must be
separated from the rest of the system using a heat exchanger.
3.7 Frost protection
During installation and operation of the heating system,
observe all country-specific standards and guidelines.
Also observe the details on the boiler data plate.
NOTICE: Risk of damage to the system from frost!
▶ Site the heating system in a room safe from the risk of
frost.
DANGER: Risk of fire from flammable materials or
liquids!
▶ Never store flammable materials or liquids in the
immediate vicinity of the boiler.
NOTICE: Boiler damage through contaminated
combustion air or contaminated air in the vicinity of the
boiler!
▶ Never operate the boiler under dusty conditions or
where the atmosphere is contaminated with
corrosive substances. These might be, for example,
paint shops, hairdressing salons and agricultural
operations (manure).
▶ Never operate boilers where trichloroethene,
halogenated hydrocarbons or other corrosive
chemical substances are used or where such
material is stored. These substances are contained,
for example, in certain adhesives, solvents, cleaning
agents and paints. In such cases, always select
balanced flue operation in a separate, hermetically
sealed installation room that has a fresh air supply.
Water quality is an essential factor for increased
efficiency, functional reliability, long service life and for
maintaining the constant operational condition of a
heating system.
▶ Observe the water quality requirements contained in
the "Water Quality Operator's Log".
▶ Warranty claims for the boilers will only be
considered provided the water quality requirements
have been met and the operator’s log has been
maintained.
NOTICE: Boiler damage through corrosion!
▶ Never operate this boiler as a gravity-fed or as open
vented heating system.
NOTICE: System damage through frost!
▶ If there is the risk that pipework may freeze up when
operating in room temperature-dependent mode
(e.g. radiator in a garage), set the pump overrun time
to 24 hours.
4 Transporting the boiler
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3.8 Combustion air connection/flue connection
The installation room must be equipped with the required combustion
air vents.
For open flue operation:
▶ Provide a combustion air vent in accordance with table 7.
1)
▶ The size of the individual apertures in grilles installed (if required) in
the ventilation opening must be at least 10*10 mm. The total area of
the individual apertures must be equal to or greater than the value
specified in table 7.
The following applies for open-flue mode:
For ventilation purposes, the installation location must have a ventilation
opening leading to the open air of at least 150 cm
2
or ventilation
openings of at least 2 × 75 cm
2
or ducts leading to the open air with
equivalent flow cross-sections.
1)
▶ Never position objects in front of these openings.
▶ The supply air duct and its openings must remain unobstructed at all
times.
▶ The dimensions of the supply air duct must be calculated in accord-
ance with the current regulations.
The boiler is to be operated at a flue system.
▶ Observe country-specific and local regulations.
▶ Observe attached documentation "Information on flue gas routing".
3.9 Combustion air quality
▶ Keep the supply of combustion air free of corrosive substances (e.g.
halogenated hydrocarbons that contain chlorine or fluorine
compounds).
This will help to prevent corrosion.
3.10 Validity of regulations
Modified regulations or supplements are also valid at the time of
installation and must be observed.
4 Transporting the boiler
The boiler may be transported to the place of installation by crane/hoist,
forklift truck or pallet truck. Where possible, transport the boiler to the
installation location in its shipping packaging to protect it from
contamination.
1) In addition to this, country-specific and local regulations must be observed.
Gas-fired condensing boiler
Aperture cross-section
[cm2
]
GB402-320-5 > 690
GB402-395-6 > 850
GB402-470-7 > 990
GB402-545-8 > 1150
GB402-620-9 > 1290
Table 7 Combustion air vents
For additional information on combustion air
connection/flue connection see Chapter 6, page 16.
CAUTION: Risk of injury through carrying heavy loads!
▶ Only transport the boiler by means of a crane/hoist,
forklift truck or transport rollers.
DANGER: Risk to life through falling loads!
Falling loads can result in life-threatening injuries.
▶ Only transport the boiler by means of a crane/hoist,
forklift truck or transport rollers.
▶ Only trained authorised personnel may undertake
the handling (e.g. by forklift truck) or lifting by means
of a crane/hoist.
▶ Observe safety instructions relating to the lifting of
heavy loads (e.g. by means of a crane/hoist).
▶ Wear personal safety equipment (e.g. safety boots
and protective gloves).
▶ Protect the boiler against slippage by means of a
transport strap.
NOTICE: Boiler damage through impact!
The standard delivery of the boiler includes components
that are susceptible to impact damage.
▶ During handling protect all components against
impact.
▶ Observe the transport markings on the packaging.
4 Transporting the boiler
Logano plus GB402 – 6 720 820 700 (2018/01)
14
4.1 Transporting the boiler by crane/hoist
▶ Route the lifting gear (round slings) through the pallet.
Fig. 4 Transporting the boiler on its pallet by crane/hoist
4.1.1 Lifting the boiler off the pallet
▶ Remove 4 safety screws [1].
Fig. 5 Separating the boiler from the pallet
[1] Locking screws
[2] Fixing bar
4.2 Transporting the boiler on rollers
If the path to the installation location is level, the boiler can also be
rolled. For this use at least 5 pipe sections of approx. 900 mm length
(R 1¼ " diameter) as rolling supports.
▶ Position the pipes approx. 400 mm apart on the floor.
▶ Lift the boiler onto the pipe sections and carefully transport it to the
installation location.
Fig. 6 Transporting the boiler on rollers (measurements in mm)
NOTICE: Boiler damage through means of transport!
Without the inverted carton, the boiler frame will deform
through lifting it by crane/hoist.
▶ When transporting the boiler do not remove the
inverted carton with internal wooden crate.
NOTICE: Boiler damage through impact!
The boiler is at risk of tipping over if it is pushed off the
side of the pallet.
▶ Push the boiler off the pallet towards the burner or
flue gas side. When pushing the boiler from the flue
gas side, remove fixing bar [2].
▶ Prevent the boiler from coming down hard.
Commercially available transport rollers can be used.
▶ Ensure even load distribution on the load-bearing
parts to prevent distortion of the bottom plate.
Protect boiler from contamination if the boiler is not to
be taken into use immediately.
Dispose of packaging in an environmentally responsible
manner.
5 Installing the boiler
Logano plus GB402 – 6 720 820 700 (2018/01)
15
5 Installing the boiler
5.1 Boiler room requirements
Preventing noise disturbance for end-users
▶ Where the boiler surroundings are sensitive to noise (e.g. residential
units), use the silencer options offered by the manufacturer (flue gas
silencers, compensators).
5.2 Wall clearances
When determining the installation location, take the clearances for the
flue and the connection pipe assembly into consideration
( Fig. 7 and Chapter 6 flue system connection and the pipework on
the water and gas sides, page 16).
Fig. 7 Wall clearances in the installation room
5.3 Floor-standing boiler levelling
Level the boiler horizontally to prevent air pockets forming inside the
boiler and to enable condensate to drain fully from the condensate pan.
▶ Bring the boiler into its final position.
▶ Level the boiler horizontally by means of its adjustable feet and a
spirit level.
Fig. 8 Levelling the boiler
NOTICE: Risk of damage to the system from frost!
▶ Site the heating system in a room safe from the risk of
frost.
DANGER: Danger posed by explosive and easily
flammable materials!
▶ Never use or store easily flammable materials (paper,
curtains, clothing, thinners, paints, etc.) in the
vicinity of the boiler.
NOTICE: Risk of boiler damage through contaminated
combustion air!
▶ Never use chlorinated cleaning agents or
halogenated hydrocarbons (as contained in spray
cans, solvents, cleaning agents, paints and
adhesives, for example).
▶ Never store or use such materials in the boiler room.
▶ Avoid very dusty atmospheres (building dust).
NOTICE: Boiler damage through overheating.
Excessive ambient temperatures can result in heating
system damage.
▶ Ensure the ambient temperature is above 0 °C and
below 35 °C.
Where applicable, allow extra wall clearances for
additional components, for example DHW cylinder, pipe
connections or other components on the flue gas side
etc.
Dimension
Wall clearance
[mm]
minimum recommended
A 700 1000
B 150 400
C
1)
1) This clearance depends on the venting system installed.
––
D 700 1000
E
1)
150 400
Table 8 Recommended and minimum wall clearances. Maintain
minimum clearance, dimension E.
NOTICE: Boiler damage through insufficient
load-bearing capacity of the installation area or
unsuitable substrate!
▶ Ensure that the installation area offers sufficient
load-bearing capacity.
6 Fitting
Logano plus GB402 – 6 720 820 700 (2018/01)
16
6 Fitting
6.1 Establishing the flue gas connection
Observe all country-specific requirements when installing the flue
system.
Very different requirements apply to flue gas connection in different
countries.
▶ Plug boiler flue connection [2] into flue connection [1].
▶ Fit condensate hose [3] to the condensate drain of the boiler flue
connector.
▶ Guide the condensate hose through the opening in the lower back
panel.
Fig. 9 Fitting the flue connection
[1] Flue gas connection
[2] Boiler flue connection with condensate drain
[3] Condensate hose
▶ Make flue connection.
The flue system is to be carried out in accordance with either pressure
classification (EN 1443) H1 or pressure classification (EN 1443) P1
with additional mechanical impact stability up to 5000 Pa.
When installing the flue connection, observe the following:
• Observe the installation instructions of the flue accessories.
• Country-specific regulations
• The flue pipe cross-section must comply with all current regulations
• Select the shortest possible route for the flue pipe and install it with
a slope towards the boiler.
• Secure the flue at appropriate intervals
• Ensure the connection is made free from stress, and that no loads are
transferred to the flue connection.
• During engineering and installation of the flue system, create a
layout that best favours the flue gas flow
Flue gas routing on multi-boiler systems (cascade).
These instructions only concern single boiler systems.
Only ask qualified contractors to calculate and size flue
gas / combustion air systems for multi-boiler systems.
Ask the manufacturer of the flue system to confirm and
verify the calculations. The flue gas system must prevent
a return flow of flue gas through boilers that are not in
use.
DANGER: Risk to life from escaping flue gas inside the
installation room!
▶ The gasket in the flue connection of the condensate
pan must be present, in good order and correctly
inserted.
NOTICE: System damage through incorrectly drained
condensate.
▶ Drain the condensate generated in the flue via the
boiler flue connection directly into the siphon inside
the boiler ( Chapter 6.2, page 17). Boiler flue
connection, condensate drain and condensate hose
are part of the standard delivery.
▶ Use the boiler flue connection that is part of the
standard delivery.
Centrocerin (scope of delivery) must be used as a
lubricating paste for installing the boiler connector into
the female connection of the condensation catch pan.
Class Leakage rate Rated pressure Mode of operation
I*s
-1
*m
-2
[Pa]
P1 0.006 200 Positive pressure/
negative pressure
1)2)
1) Positive pressure up to maximum 200 Pa
2) Usage only with additional mechanical impact stability up to 5000 Pa in the
connection piece
H1 0.006 5000 Positive pressure/
negative pressure
3)
3) Positive pressure up to maximum 5000 Pa
Table 9 Pressure classifications of the flue system
The wind protectors for the combustion air supply and
the flue gas routing must not be installed on opposite
walls of the building.
The boiler must not be connected to any combined flue
system with motorised combustion systems (e.g.
combined heat and power unit).
6 Fitting
Logano plus GB402 – 6 720 820 700 (2018/01)
17
6.2 Installing the condensate hose
▶ Remove the cap from the filler hole in the siphon supplied and fill with
approx. 2 litres of water.
▶ Fit elbow [4] with inserted gasket onto the filler hole.
▶ Fit the condensate hose from connector [3] with a hose clip to the
elbow.
▶ Fit the siphon to the outlet on condensate pan [2].
▶ Install neutralising systems (accessories) in accordance with the
installation instructions, either inside the boiler or on site.
▶ Connect the condensate hose from the siphon with a slope to the
neutralising system.
▶ Connect the condensate hose from the siphon with a slope to the
neutralising system.
Fig. 10 Installing the condensate hose
[1] Neutralising system (accessory)
[2] Condensate pan
[3] Connection for condensate hose from the connector
[4] Elbow, filler hole
[5] Siphon outlet to condensate neutraliser or waste water pipe
[6] Siphon
▶ Make the connection to the sewerage system in accordance with the
instructions of the neutralising system and locally applicable
regulations.
NOTICE: Damage to gaskets due to burred edges on the
insertion ends of the pipe parts!
▶ Ensure that the insertion ends are free of burrs.
If chamfering on site is required, only in accordance
with the manufacturer's documentation.
Centrocerin (scope of delivery) must be used as a
lubricating paste for installing the flue system into the
connector.
DANGER: Risk to life through toxic exhaust gases
escaping.
▶ Check the entire flue system for correctly made and
sealed joints.
Information regarding the condensate hose.
▶ Carefully drain the condensate created inside the
boiler and flue (route the flue with a slope towards
the boiler).
▶ Drain the condensate generated in the flue via the
boiler flue connection directly into the siphon inside
the boiler. Boiler flue connection, condensate drain
and hose are part of the standard delivery.
▶ Drain the condensate into the public sewerage
system in accordance with the requirements in your
country.
▶ Observe regional regulations.
DANGER: Risk to life through poisoning! Open
connections or siphons not filled with water can cause a
through from escaping flue gas.
▶ Filling the siphon with water.
Neutralising systems are available as accessories and
can be fitted inside the boiler casing.
Where the neutralising system is installed outside the
boiler, there is the option of guiding the condensate hose
through the aperture in the back panel.
6 720 618 585-45.2T
6 Fitting
Logano plus GB402 – 6 720 820 700 (2018/01)
18
6.3 Fitting the boiler cover
▶ Fit front boiler cover [1] with 4 screws to the frame.
▶ Fit rear boiler cover [2] with 4 screws to the frame.
Fig. 11 Front and rear boiler covers
[1] Front boiler cover
[2] Rear boiler cover
6.4 Connecting the air supply (for balanced flue
operation)
The combustion air is supplied to the boiler either through an external
wall connection, a duct or a separate pipe in the duct.
The dimensions of the supply air line must be calculated in accordance
with the current regulations.
▶ Remove cover panel [2] from the front boiler cover.
▶ Remove front [1] and rear [4] boiler covers.
▶ Fit adaptor [3] (accessory) on the cross-brace and seal with sealant
(accessory).
▶ Installing the front and rear boiler cover ( Chapter 6.3)
▶ On-site, isolate the air supply connection from power supply at the
adaptor using a standard air pipe system and seal it.
▶ Observe the installation instructions for the standard air supply
system.
▶ In cascade arrangements, ensure that the boiler is equipped with
a separate ventilation air line.
▶ Isolate the air supply pipe from power supply and construct it to
adaptor using a standard air pipe system according to the national
requirements.
▶ Insulate the ventilation air line to prevent condensate forming (inside
and outside).
Fig. 12 Ventilation air connection for balanced flue operation
(accessory)
[1] Front boiler cover
[2] Ventilation panel
[3] Adaptor
[4] Rear boiler cover
An adaptor is available as an accessory for balanced flue
operation.
We would recommend the installation of a silencer in the
ventilation air line, subject to the air inlet aperture
arrangement on the outside of the building.
Insulate the ventilation air line to prevent condensate
being created in/on that line (inside and outside).
NOTICE: Damage to gaskets due to burred edges on the
insertion ends of the pipe parts!
▶ Ensure that the insertion ends are free of burrs.
If chamfering on site is required, only in accordance
with the manufacturer's documentation.
The wind protectors for the combustion air supply and
the flue gas routing must not be installed on opposite
walls of the building.
6 720 618 585-46.2T
4
3
1
2
6 Fitting
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6.5 Establishing the heating circuit connection
6.5.1 Connecting the flow
▶ Insert a gasket between the flange on the boiler and the threaded
flange on the flow.
▶ Secure the flange connection with 4 screws, washers and nuts.
Fig. 13 Fitting the flow (VK)
6.5.2 Installing the safety assembly (on site)
▶ Observe the accessories installation instructions.
▶ Seal in distributor [2] at flow connector [1] using a suitable sealant.
▶ Remove the union at the cap valve fitting [3].
▶ Fit union with gasket to connector of fitting manifold [4] and secure
to the cap valve on the distributor.
▶ Level the fitting manifold and fit maximum pressure limiter [5].
Fig. 14 Installing the fitting manifold
[1] Flow connector
[2] Hydraulic separator
[3] Cap valve
[4] Fitting manifold complete with cap valve ¾ Inch
[5] Maximum pressure limiter
▶ At an operating pressure up to 3 bar, seal in the safety valve at the
distributor connector with a suitable sealant.
Fig. 15 Safety valve (up to 3 bar)
[1] Safety valve
NOTICE: System damage due to leaking connections!
▶ Install all lines free from stress to the boiler
connections.
▶ Use new gaskets if fittings need to be undone.
▶ Only tighten flanges in the heating flow and return
after the connections have been made.
▶ Before installing the pipe connections, check
connections and gaskets on the boiler for possible
damage.
Boiler flow (VK)
Boiler return (RK)
DN80 PN6 standard flange EN1092
Table 10 Water connection dimensions
NOTICE: System damage through incorrect installation!
▶ Install the safety valve and automatic air vent valve or
safety assembly in the flow.
The safety assembly (accessory) comprises an
automatic air vent valve and a pressure gauge. As an
option, it may be converted for use with a safety valve
(additional accessory) and a fitting manifold for the
maximum pressure limiter.
If these accessories are not used, a safety valve,
pressure gauge and an automatic air vent valve must
generally be installed in the flow, upstream of the first
shut-off valve.
Subject to operating pressure, different safety valves are
required.
6 Fitting
Logano plus GB402 – 6 720 820 700 (2018/01)
20
▶ At an operating pressure of 3 to 6 bar, seal in female connection [4]
and threaded flange [3] at the distributor connector with a suitable
sealant. Secure safety valve [1] with gasket [2] on the threaded
flange.
▶ Fit the blow-off line to the respective safety valve.
Fig. 16 Safety assembly (3 to 6 bar)
[1] Safety valve
[2] gasket
[3] Threaded flange
[4] Female connection
6.5.3 Connecting the return
▶ Undo the threaded flange from the return.
▶ Fit the threaded flange to the return (on site) ( table 10, page 19).
▶ Insert a gasket between the flange on the boiler and the threaded
flange on the return.
▶ Secure the flange connection with 4 screws, washers and nuts.
Fig. 17 Fitting the return (RK)
Connection the diaphragm expansion vessel (DEV)
To safeguard individual boilers, a DEV can be connected to the ¾ inch
connection on the return, in accordance with EN 12828.
▶ Install the DEV on site to maintain the system pressure in the return,
upstream of the pump.
▶ Observe the accessories installation instructions.
Connecting the drain & fill valve on site
▶ To enable a topping up of the heating water, instruct the user about
the location of the drain & fill valve.
▶ Install a drain & fill valve in the return outside the boiler itself.
▶ Observe the accessories installation instructions.
6.5.4 Installing a DHW cylinder
Make the connection of a DHW cylinder to the flow and return on site.
The MC10 + BC10 control unit can switch the required external cylinder
primary pump ( MC10/BC10 instructions).
We recommend the on-site installation a dirt filter
(accessory) in the return to prevent contamination of the
boiler by the water.
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Buderus GB402-395-6 Installation And Maintenance Instructions For Contractors
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- Installation And Maintenance Instructions For Contractors
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