Buderus GB125BE-22 Guide
For Buderus models:
- GB125BE-22/30/35
Design Manual
GB125 Concentric Vent
2|
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specications are subject to change without prior notice
Applications manual
| 3
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009 Technical specications are subject to change without prior notice
Table of Contents
1 General information 5
1.1 This manual 5
1.2 Standards, regulations and directives 5
1.3 System certication 5
2 Safety 6
2.1 Intended use 6
2.2 Layout of the instructions 6
2.3 Please follow these instructions 6
2.4 Tools, materials and accessories 6
2.5 Disposal 6
3 Description of systems 7
3.1 Scope 7
3.2 Available systems 7
4 General requirements 8
4.1 Installation requirments for the boiler room 8
4.2 Condensate drain 8
4.3 Annual inspection 8
4.4 Safety distances to combustible material 8
4.5 Terminations 8
4.6 Instructions for inspection and clean-out
sections 8
5 Installing the ue gas system 9
5.1 General installation notes 9
5.2 Trimming pipes 9
5.3 Installing the pipes 9
5.4 Pipe disassembly 10
5.5 Appliance connection 10
5.6 Installation and nal assembly 10
6 Inspecting the ue gas system 11
7 Direct Vent - HTK Venting System kit 12
8 Vertical Vent - DO Venting System kit 13
9 Chimney Liner - GAK Venting System kit 15
9.1 Installation in an existing chimney shaft 17
9.2 Installation of rigid chimney pipe 18
9.3 Flexible chimney liner - GAK system with
UB ex 21
9.4 Accessories for GAK systems 24
4|
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specications are subject to change without prior notice
Applications manual
| 5
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009 Technical specications are subject to change without prior notice
1. General information
1.1. This manual
These instructions contain important information for the
safe and appropriate installation of the ue gas systems
and system startup.
It is a design guide for the venting system of the Buderus
GB125 boiler, and it describes the prepackaged kits and
their accessories, as well as important design
considerations. It is intended for the installer during the
planning phase and the actual installation.
These instructions are designed for specialists, who -
through their training and experience - are knowledgeable
in the installation and servicing of heating systems and oil
installations.
This document is a supplement to the boiler manuals and
the instructions included with the venting system.
1.2. Standards, regulations and directives
It is the responsibility of the installer to ensure that the
system corresponds to all current building codes and
regulations.
1.3. System certication
For Buderus GB125 oil condensing boilers:
The GB125 is system-certied with this ue gas system for
the USA and Canada by CSA International.
An individual approval of the ue gas system is not
required.
The ue gas system must be installed in accordance with
the installation instructions. The maximum permissible
overall length and the number of changes of direction are
specied on page 7.
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GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specications are subject to change without prior notice
2. Safety
2.1. Intended use
This concentric venting system may be used as ue gas
system for Buderus oil condensing boilers with maximum
ue gas temperatures of 248 °F (120 °C). Suitable are
boilers of the types:
– Logano plus GB125BE-22/30/35
2.2. Layout of the instructions
Two levels of danger are identied and signied by the
following terms:
WARNING! RISK OF FATAL INJURY
Identies possible dangers emanating from a
product, which might cause serious injury or
death if appropriate care is not taken.
CAUTION! RISK OF INJURY/SYSTEM
DAMAGE
Indicates a potentially dangerous situation that
could cause minor or moderately serious
injuries and damage to property.
Additional symbols for identication of dangers and user
instructions:
USER NOTE
User tips for optimal use of equipment and
adjustment as well as other useful information.
2.3. Please follow these instructions
WARNING! RISK OF FATAL INJURY FROM
FLUE GAS AND CARBON MONOXIDE
POISONING.
Insufcient ventilation or leaky ue gas pipes may
cause dangerous ue gas leaks.
– Ensure that air intake or exhaust air vents are
not closed off or their size reduced.
– The boiler must not be operated until the
obstruction has been removed.
– Inform the system user in writing of the fault
and its associated dangers.
WARNING! RISK OF DEATH FROM FALLING.
Take sufcient measures to prevent accidents on
the roof.
Use state of the art safety equipment and take
common sense safety measures.
WARNING! RISK OF INJURY OR DEATH FROM
TOOLS AND EQUIPMENT FALLING FROM THE
ROOF.
Secure tools and equipment against falling from
the roof.
Only use original Buderus spare parts.
Damage caused by the use of parts not supplied
by Buderus is excluded from the Buderus
warranty.
2.4. Tools, materials and accessories
For the installation of the boiler, you will need standard
tools used for central heating, oil boiler and DHW water
systems.
Additional tools needed are described in the appropriate
section of these instructions.
2.5. Disposal
– Dispose of the packaging of the ue gas system in an
environmentally responsible manner.
– Dispose of defunct components of the ue gas system
through an authorized agent in an environmentally
responsible manner.
Applications manual
| 7
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009 Technical specications are subject to change without prior notice
3. Description of the systems
3.1. Scope
The concentric venting system described in this manual
is used exclusively for the Buderus GB125 boiler. No
other venting system can be used with this boiler, and the
venting system can not be used in conjunction with any
other boiler.
Do not replace or substitute any vent or combustion air
pipe with another brand, make, model, or material.
The Buderus GB125 is designed for balanced ue
operation only. All combustion air is drawn from the
outdoors. Use of balancers or barometric dampers dees
the system principle and is not permitted.
Installation and service of Buderus concentric venting
systems must be performed by a trained installer.
CAUTION! Never connect this concentric vent to
a common venting system
3.2. Available systems
The three types of systems that are available are shown
in Fig. 1:
Observe the maximum vent lengths for each boiler size
as shown in Table 1.
Systems are available as prepackaged kits that include
the essential components needed in every installation.
Refer to the descriptions of the individual system for
included items. For most systems extra straight pipe and
additional elbows must be purchased as needed. See list
of accessories for every system.
The GAK system draws combustion air from the
roof and may not be suitable for installation in
multi-ue chimneys, where a second ue vents a
combustion appliance that is used on a regular
basis. Flue gases could be drawn in with GB125
combustion air and cause system interruption.
HTK - Direct vent through
side wall
(See page 12)
Part Number: 7747310386
DO - Vertical vent through
conditioned and uncondi-
tioned space (NOT -suitable
for installation outdoors)
(See page 13)
Part Number: 7747200752
GAK - Liner inside an existing
chimney;
Option 1: rigid pipe for a
straight chimney;
Option 2: flexible liner for
chimneys with an offset or
bend;
(See page 15)
Part Number: 7747200755
Fig.1 Available systems
Max. length of ue pipe, feet (m)
Buderus ue pipe systems DN 80/125 Table 1
Boiler Size HT-K direct
vent
DO
vertical vent
GAK
chimney
liner
GB125 - 22 17' (5.2 m) 51' (17 m) 51' (17 m)
GB125 - 30 17' (5.2 m) 64' (21 m) 64' (21 m)
GB125 - 35 17' (5.2 m) 71' (23 m) 71' (23 m)
The overall lengths include two elbows for the HT-K, and
one elbow for the DO and GAK kits. Every additional
elbow (accessory) reduces the maximum vent length by 3
ft (1 m).
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GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specications are subject to change without prior notice
4. General requirements
4.1. Installation requirements for the boiler
room
The GB125 is designed for balanced ue operation only.
All combustion air is drawn from outdoors.
Allow ample room at the back of the boiler for servicing of
the secondary heat exchanger.
4.2. Condensate drain
The boiler has an integrated condensate drain in the
secondary heat exchanger. The condensate from the vent
pipe ows directly into the boiler’s trap (siphon). This
requires that all horizontal vent pipes are pitched at ⅝
inch per foot (55 mm per meter) toward the appliance,
including the horizontal termination (HTK-kit only). No
second condensate drain is needed.
Note that the siphon oat must be cleaned at
least once a year to ensure safe and proper
operation.
The Buderus GB125BE boiler comes with a condensate
neutralizer that must be properly maintained. Follow local
rules when draining condensate into municipal sewage
systems. It is not recommended to drain untreated
condensate into septic systems. In any case follow local
codes and regulations.
4.3. Annual inspection
The venting system must be inspected annually for signs
of damage or condensate leaks. If the venting system
appears damaged, the appliance must be turned off and
the venting system repaired.
4.4. Safety distances to combustible material
The design of the concentric venting system allows
installation with zero (0” (0 mm)) clearance to
combustibles. Therefore, no particular protective
measures or safety distances are required to combustible
material or furniture.
4.5. Terminations
Terminations must be so positioned as to avoid products
of combustion entering openings into buildings or other
ues or vents.
The Buderus concentric vent is designed for indoor
installation in conditioned and unconditioned spaces only.
Only the end of the termination is protected from UV-
radiation (direct sunlight) and the weather. None of the
other pipes or elbows may be installed outdoors.
4.6. Instructions for inspection and clean-out
sections
Local codes and regulations may require access to the
vent pipe for inspection and clean-out. Buderus offers an
inspection and clean-out section that allows inspecting
and cleaning the venting system without dismantling.
Table 2
Part number Description
87094587 clean out straight pipe
Note that the GAK chimney liner basic kit
includes the above clean out section.
The inspection and clean-out section (Fig. 9, page 15)
must be installed sideways in the horizontal section of the
ue gas pipe as the rst section after the boiler adapter.
Keep an area of at least 3 ft. x 3 ft. (1 m x 1 m) clearance
in front of the inspection section for access.
An upper inspection section may be needed if there are
any changes in direction, e.g. when elbows are used to
create an offset. Install the inspection and clean-out
section in the horizontal run above the change in
direction.
Keep an area of at least 1-1/2 ft. x 1-1/2 ft. (0.5 m x 0.5
m) clearance in front of the upper inspection section for
easy access.
Applications manual
| 9
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009 Technical specications are subject to change without prior notice
5. Installing the ue gas system
5.1. General installation notes
WARNING! RISK OF DEATH FROM LEAKING
FLUE GASES.
Improper installation of venting system and
components or failure to follow all installation
instructions can result in property damage or
serious injury.
5.2. Trimming pipes
CAUTION! RISK OF INJURY FROM SHARP
EDGES.
Wear work gloves.
– With concentric pipes, pull the inner pipe out of the
outer pipe in the direction of the gasket.
– Trim pipes at a right angle to the required length x
(Fig. 2).
– Trim the same length off the ue gas and air intake
pipes.
– Carefully remove burrs from cut edges; otherwise
gaskets will get damaged, which can result in the
system no longer being air tight and condensate to
leak.
– Reinstall the ue gas and air intake pipes.
5.3. Installing the pipes
Pipes are assembled so that the sleeve points in the
direction of the ue gas stream, with the gasket on the far
side of the pipe when viewed from the boiler. Only use
original Buderus ue gas pipe gaskets!
– Coat the gaskets (Fig. 3 Item 1) and pipe ends with
CENTROCERIN®
gasket lubricant (supplied with the basic kit).
– Push the ue gas pipes (Fig. 3 Item 2) into one another
with a slight turning motion until the stop.
– With concentric pipes, push the combustion air pipe
(Fig. 3 Item 2) together to ensure a tight t.
– Verify that the gaskets did not shift.
– Never use screws to hold pipe together.
– If needed suspend pipe from the ceiling or the oor.
Fig. 2 Cuttting pipes
X: Desired length
Fig. 3 Pipe assembly
1: Location of the gaskets
2: Flue pipe
3: Combustion air pipe
1 0 |
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specications are subject to change without prior notice
5.4. Pipe disassembly
Pull the pipes apart while turning slightly.
5.5. Appliance connection
To install the appliance connector on the boiler, identify
the gasketed connection in the bottom right corner at the
back of the boiler.
Apply CENTROCERIN® gasket lubricant on the gasket of
the secondary heat exchanger and on the mating adapter
pipe, and assemble with a slight turning motion. The
combustion air pipe should be oriented in a 10-o’clock
position with all 3 predrilled screw holes visible. (Fig. 4).
Use the supplied brackets and self tapping screws to
attach the adapter to the rear boiler panel.
Connect the combustion air hose to the adapter and
secure with the provided hose clamp.
5.6. Installation and nal assembly
(1) Install the termination.
(2) Follow the installation instructions to waterproof
the penetration. Follow standard industry practice
and consult a specialist if needed.
(3) On the boiler install a clean out section immediately
after the boiler adapter (if applicable).
(4) Connect the termination with the boiler using straight
concentric pieces and concentric elbows as required
by the installation site. Sections can be cut to length
per the procedure shown on page 9.
(5) After cutting to the appropriate length, coat gaskets
and mating pipes with CENTROCERIN® gasket
lubricant and slide the pieces together with a slight
turning motion.
(6) Sections longer than 6 ft. (2 m) must be supported
with bracing or clamps. Do not use the termination or
the boiler adapter to support the venting system.
It is the installer’s responsibility to ensure that the
vent pipe is securely attached and supported as
required by the site, and cannot accidentally
disintegrate.
Fig. 4 Appliance connection
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