Buderus Logano GA244 User manual

6302 9646 – 02/2004 US/CA For Contractors
Read manual prior to installation and maintenance of the boiler
Installation, Operation and
Maintenance Manual
Sealed Combustion
Hot Water Gas Boiler
Logano GA244
CAUTION!
Before putting the boiler into operation
read this manual carefully.
WARNING !
Improper installation, adjustment,
alteration, service or maintenance can
cause injury, loss of life or property
damage. Refer to this manual. For
assistance or additional information
consult a qualified installer, service
agency or the gas supplier.
CAUTION !
The operating manual is part of the
documentation that is delivered to the
installation's operator. Go through the
information in this manual with the
owner/operator and make sure that he
or she is familiar with all the necessary
operating instructions.
Notice: This manual must be retained for future reference.

Imprint
2
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Please read this manual carefully!
Correct installation and adjustment of the burner and the
control panel is a precondition for safe and efficient
operation of the gas boiler.
Read this manual and the specifications on the safety
label carefully before attempting to put the boiler into
operation.

Table of Contents
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
1 Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 Application purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.2 Guideline of Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.3 Observe the following symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2 Regulations and Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3 Dimensions and Boiler Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4 Packaging and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
5.1 Transporting the Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
5.2 Installation Surface Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5.3 Preparations for Boiler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
6 Boiler Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Electrical Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.1 Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.2 Installation at Higher Elevations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9 Combustion Air and Ventilation Openings . . . . . . . . . . . . . . . . . . . . . . . . 15
10 Installation of the Exhaust and Air Intake System . . . . . . . . . . . . . . . . . . 17
10.1 Installation of Horizontal Wall Terminal Body . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10.2 Installation of Vertical Venting System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10.3 Installation of Exhaust and Air Intake Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 21
11 Placing the Boiler in Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.1 Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.2 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11.3 Shut off of Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.4 Start-up Procedure Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.5 Detailed Steps for Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.1 Maintenance Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.2 Maintenance Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
12.3 Trouble Shooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
13 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
14 Orifice Tables for High Elevations and Propane . . . . . . . . . . . . . . . . . . . . 68
15 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Safety Considerations1
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
1 Safety Considerations
Please observe the following safety instructions.
1.1 Application purpose
The GA244 gas boiler is designed for use as a hot water
heating boiler to heat water for space heating purposes
for a single and multi family houses.
1.2 Guideline of Notices
Two levels of danger are identified by the following
warning labels:
The following symbols are used to denote a danger and
other notices:
1.3 Observe the following symbols
WARNING!
DANGER
Denotes a possible severely dangerous
situation where, without proper caution,
bodily injury or loss of life may result.
CAUTION!
DANGER OF INJURY/
SYSTEM DAMAGE
Denotes a possible dangerous situation
that can lead to mild to moderate bodily
injury or physical damage.
WARNING!
DANGER
due to electricity.
APPLICATION NOTICE
Application comment for optimum use of
equipment and adjustment as well as useful
information.
WARNING!
DANGER
due to explosion of gas.
zWork only on gas components when
you have a license to do so.
zNote that the assembly of gas and vent
connections, the initial start-up, the
electrical connections, the
maintenance and service can only be
performed by a licensed service
contractor or technician.
WARNING!
DANGER
due to electricity.
zPrior to doing any work on the heating
system, disconnect all electrical power
to the boiler at the emergency switch.
zIt is NOT sufficient to shut off only the
boiler control!
CAUTION!
SYSTEM DAMAGE
due to improper installation.
zObserve local and state codes as well
as common industry practices during
the installation and operation of the
heating appliance.
CAUTION!
SYSTEM DAMAGE
due to inadequate cleaning and mainte-
nance.
zA boiler cleaning and maintenance
should be performed annually. Verify
complete system operation at the
same time.
zCorrect the problem immediately to
prevent damage to the system!

Regulations and Guidelines 2
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
2 Regulations and Guidelines
The installation must be conform to the requirements of
the authority having jurisdiction or, in the absence of
such requirements, to the latest edition of the National
Fuel Gas Code, ANSI Z223.1. In Canada, installation
must be in accordance with the requirements of
CAN/CGA B149.1 or 2 Installation Code for Gas Burning
Appliances and Equipment.
Where required by the authority having jurisdiction, the
installation must conform to the Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
Install CO detectors per local regulations. Boiler
requires yearly maintenance, see maintenance section
see section 12 „Maintenance“, page 35.
Operating Limits of the boiler:
The hot water distribution system must comply with all
applicable codes and regulations. When replacing an
existing boiler, it is important to check the condition of
the entire hot water distribution system to insure safe
operation.
Max. boiler temperature: 220°F
Max. operating pressure: 58 psi

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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Dimensions and Boiler Connections3
3 Dimensions and Boiler Connections
Table. 1 Dimensions
Table. 2 Dimensions
Fig. 1 Rear, side and front views, measurements in inches
Pos. 1: Boiler return (1 ½“)
Pos. 2: Boiler drain connection (¾“)
Pos. 3: Gas connection (¾“)
Pos. 4: Boiler supply (1 ½“)
Pos. 5: Exhaust connection
Pos. 6: Air intake connection
D
C
A
B
1
2
3
4
56
Boiler
model
Heating
capacity
Air intake
connection
Exhaust
connection
Min. Relief
Valve
No. of
Burners
Water-
content
Dry
weight
MBtu/hr Inches Inches lb/hr No. US Gal. lbs
37 128 4 3 130 4 6.1 635
44 148 4 3 153 46.1 635
53 181 4 3 188 5 7.1 688
62 212 4 4 218 68.2 772
Fig. 2 Pressure drop through the boiler
1.45
7.25
0.1
1.8 17.6 68.2
156/182 MBTu/h
(Size 37/44)
Flow Rate in PM
Pressure Drop in psi
Boiler
model
A
Air intake
B
Exhaust C D
Inches Inches Inches Inches
37 7 3/8 17 1/2 43 3/4 25 6/8
44 7 3/8 17 1/2 43 3/4 25 6/8
53 7.9 20.9 43.3 29.1
62 7.9 24.4 43.3 32.7

Packaging and Components 4
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
4 Packaging and Components
The boiler is shipped as a packaged unit complete with
jacket panels, installed gas burner tray and gas valve
and technical documents. The following components
are packaged in a separate box within the boiler
packaging:
–1 3/4“ female boiler drain elbow
–1 3/4“ 90° Elbow
–1 3/4“ Relief valve
–1 horizontal wall terminal body
Following accessories are available as well:
–Cleaning brushes
–Vertical wall terminal body

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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Installation5
5Installation
This boiler is certified for closet installations. To ensure
adequate access to the boiler during installation and
maintenance, the boiler should have a minimum space
in front of the boiler of at least 33" with the access door
open. When the access door is closed, a minimum
clearance of 2 inches in front and on the sides of the
boiler from combustibles is required (Fig.3). Maintain a
minimum clearance from combustibles of 2 inches for
the exhaust vent pipe. A 20“ top clearance is
recommended for cleaning access and is strictly
required when the boiler is placed in a fully enclosed
closet. A 2“ rear clearance is required for horizontal vent
pipe installations. The gas boiler is certified for
installation on combustible flooring. The boiler must not
be installed on carpeting.
Provide 2“ clearance between vent pipe and
combustible construction.
No clearance is required between wall terminal body
and combustible construction
5.1 Transporting the Boiler
zTransport the boiler to the installation site in the
shipping carton and on the pallet.
zRemove strapping and lift off carton.
zRemove the two bolts that secure boiler to the
wooden pallet.
zLift the boiler from one side and slide to the side of
the pallet. Push a pipe under the boiler as shown in
Fig. 4 and roll boiler on several pipes to its final
location.
zMove the boiler to its final installation position.
Fig. 3 Minimum clearances from combustible construction
Item. 1: Access door closed
Item. 2: Access door open
Item. 3: Exhaust vent pipe
2"
2"
2"
33"
2"
1
2
3
Fig. 4 Moving the boiler
NOTICE !
Always protect sheet metal parts, gas
pipe, burner and control panel during
handling.
zNever lift the boiler on these parts.

Installation 5
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
5.2 Installation Surface Requirements
The boiler is very heavy when filled with water. Make
sure the floor is strong enough to support the load.
5.3 Preparations for Boiler Installation
zUnpack all boxes and cartons and check that all parts
have been delivered using the packing list.
NOTICE !
Each boiler is checked and tested carefully
before leaving the factory. If there is any
damage or parts are missing, inform the
supplier without delay. Check all
packaging materials for missing
components before discarding them.

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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Boiler Water Connections6
6 Boiler Water Connections
Fig. 5 Low water cut off installation
Item. 1: Gas boiler
Item. 2: heating elements (panel radiator, baseboard, etc.)
Item. 3: system requiring low water cut off
Item. 4: system not requiring low water cut off
1
2
2
12
2
2
2
3
4
DANGER!
BOILER DAMAGE !
due to moisture.
zInstall this boiler so that the gas ignition
system components are protected from
water (dripping, spraying, rain, etc.)
during appliance operation and service
(circulator replacement, control
replacement etc.).
DANGER!
SYSTEM DAMAGE !
due to over heating during low water
conditions.
zIf this boiler is installed above radiation
level it must be provided with a low
water cut-off device either as a part of
the boiler or at the time of installation
(see Fig. 5).
DANGER!
SYSTEM DAMAGE !
due to high temperature differences in the
system.
zIf the boiler is used in conjunction with
a refrigeration system, pipe the chilled
medium in parallel with the boiler and
install the proper valve to prevent the
chilled medium from entering the boiler.
zWhen the boiler is connected to heating
coils located in air handling units where
they may be exposed to refrigerated air
circulation, the boiler must be equipped
with flow control valves or other
automatic means to prevent gravity
circulation of the boiler water during the
cooling cycle.

Boiler Water Connections 6
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
zInstall the 90° street elbow (Fig. 6) and the relief
valve (Fig. 6 ) on the boiler supply connection.
zInstall relief valve according to ANSI/ASME Boiler
and Pressure Vessel Code, Section IV. Mount the
relief valve stem vertically. Use ¾" street elbow as
needed.
Water treatment
Fig. 6 Rear view
Item. 1: Gas boiler
Item. 2: Boiler supply connection
Item. 3: Relief valve
Item. 4: Boiler supply pipe
1
2
3
4
NOTICE !
Observe local and state codes when
installing the boiler.
DANGER!
FIRE DANGER !
due to hot piping.
zMaintain a minimum 2" clearance
between the hot water piping and
combustible walls.
NOTICE !
Perform a water analysis prior to filling the
boiler system. Treatment of the boiler
water may be required depending on the
analysis results.
For extremely hard water or pH value
below 7.0 consult your local water
treatment company.

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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Electrical Supply7
7 Electrical Supply
The electrical connections to the boiler must be made in
accordance with all applicable local codes and the latest
revision of the National Electrical Code, ANSI/NFPA-70.
Installations should also conform with CSA C22.1
Canadian Electrical Code Part 1 if installed in Canada.
The boiler must be electrically grounded in accordance
with the requirements of the authority having jurisdiction
or, in the absence of such requirements, with the
National Electrical Code, ANSI/NFPA 70.
Install an emergency switch near the boiler.
zVerify proper operation after servicing.
NOTICE
For wiring details, follow the wiring
diagrams found on page 69 and page 70.
WARNING!
CAUTION !
due to electricity.
zLabel all wires prior to disconnection
when servicing controls.
zWiring errors can cause improper and
dangerous operation.

Gas Supply 8
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
8 Gas Supply
8.1 Gas Connections
Determine proper size gas pipe for the installation using
Table 3 and Table 4. Do not forget the pipe fitting losses
and observe proper size of the fittings.
A sediment trap must be installed at the inlet of the gas
supply piping to the boiler. When local codes require, a
manual shut-off valve must be installed outside the
boiler jacket. It is recommended that a manual shut-off
valve be installed on the main gas piping to the boiler.
The gas piping must be supported external to the boiler.
When installing the gas supply connection, it must
comply with local regulations or, if such regulations do
not exist, with the National Fuel Gas Code, ANSI Z
223.1. In Canada, the gas supply connection must
comply with local regulations or, if such regulations do
not exist, with CSA/CGA-B149 Installation Guidelines.
Table 3 Gas Pipe Capacity for different pipe sizes
1 Maximum pipe capacity in ft³/hr, based on a specific gravity of .60
and a gas supply pressure of .5 psi or less and a pressure drop of
.3 inches W.C.
Fig. 7 Gas supply piping: rear view
Item. 1: Gas supply piping
Item. 2: Manual shut off valve
Item. 3: Sediment trap
1
2
3
DANGER!
EXPLOSION DANGER !
The possibility for explosions exists due to
leaks in gas piping and connections.
zAll gas connections must be tested for
leaks with a soap and water solution.
Length
of
pipe
(Feet)
Gas Volume Capacity
(ft3 / hr)1
1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“
10 132 278 520 1060 1600
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 160 305 480
150 31 64 120 250 380

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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Gas Supply8
Table 4 Equivalent length of pipe fittings in feet
The boiler must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than ½ psi.
zThe boiler and its gas connection must be leak tested
before placing the boiler in operation. Refer to
Chapter 11 "Placing the Boiler in Operation",
page 26.
Pipe joint compound (pipe dope) must be resistant to
corrosive action of liquified petroleum gases and applied
sparingly only on male threads of pipe joints.
To field convert the boiler for operation with LP gas,
please contact Buderus Hydronic Systems to obtain the
proper components. Do not convert the boiler without
the proper parts and instructions. Parts for LP
conversion are included with the documents.
8.2 Installation at Higher Elevations
The boiler is factory set for operation with natural gas at
elevations up to 2,000 ft. The boiler must be derated for
installations above 2,000 ft. The derate is accomplished
by changing the main burner orifices. Contact your
supplier in this case to obtain the suitable high elevation
conversion kit (Natural gas or LP). Do NOT attempt to
derate the appliance without Buderus certified parts and
instructions.
Steel pipe
Diameter
(in Inch)
Equivalent Length for Pipe Fittings in
feet
Type of pipe fitting
90°-
Elbow
Tee
(flow
thru
branch)
Gate
valve
Gas
cocks
Equivalent length in feet
1/2 1.4 2.7 0.3 0.80
3/4 2.1 4.1 0.5 1.25
1 2.6 5.2 0.6 1.6
1 1/4 3.5 6.9 0.8 2.15
1 1/2 4.0 8.0 0.9 2.50

Combustion Air and Ventilation Openings 9
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
9 Combustion Air and Ventilation Openings
Provisions must be made for combustion air and
ventilation air in accordance with section 5.3 Air for
Combustion and Ventilation, of the National Fuel Gas
Code, ANSI Z 223.1, or applicable provisions of the local
building code.
Canadian installations must comply with CSA/CGA-
B149.1 and .2 Installation Codes.
CAUTION!
BOILER DAMAGE AND OPERATIONAL
FAILURES !
Due to insufficient or lacking openings for
combustion air and/or ventilation of the
boiler room.
Provisions for combustion air and
ventilation are always required, regardless
whether the combustion air is taken from
the outside (sealed combustion) or inside
(room air for combustion).
Insufficient ventilation of the boiler room
can lead to high air temperatures. This
can result in boiler damage.
zMake sure that intake and exhaust
openings are sufficiently sized and no
reduction or closure of openings takes
place.
zWhen the problem is not resolved, do
not operate the boiler.
zPlease note these restrictions and its
dangers to the operator of the boiler.
CAUTION!
BOILER DAMAGE !
due to contaminated air.
zBoiler must be clear and free from
combustible materials, gasoline and
other flammable vapors and liquids,
and corrosive liquids and vapors.
Never use chlorine and hydrocarbon
containing chemicals (such as spray
chemicals, solution and cleaning
agents, paints, glues etc) in the vicinity
of the boiler.
zDo not store and use these chemicals
in the boiler room.
zAvoid excessive dust formation and
build-up.
NOTICE !
When one expects contaminated
combustion air (near swimming pools,
chemical cleaning operations and hair
salons), sealed combustion operation is
recommended.
DANGER!
FIRE DANGER !
due to flammable materials or liquids.
zDo not store flammable materials and
liquids in the immediate vicinity of the
boiler.

Combustion Air and Ventilation Openings9
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
All Air from Inside the Building
The closet shall be provided with two permanent
openings communicating directly with an additional
room(s). The total input of all gas utilization equipment
installed in the combined space shall be considered in
making this determination. Each opening shall have a
minimum free area of 1 square inch per 1,000 Btu per
hour of total input rating of all gas utilization equipment
in the confined space, but no less than 100 square
inches. One opening shall commence within 12 inches
of the top, and one opening shall commence within 12
inches of the bottom of the enclosure. The minimum
dimension of air openings shall be not less than 3
inches.
All Air from Outdoor
The closet shall be provided with two permanent
openings, one commencing within 12 inches from the
top, and one commencing within 12 inches from the
bottom of the enclosure. The openings shall
communicate directly, or by ducts, with the outdoors or
spaces (crawl or attic) that freely communicate with the
outdoors. The minimum dimension of air openings shall
be no less than 3 inches.
1. Where directly communicating with the outdoors,
each opening shall have a minimum free area of 1
square inch per 4,000 Btu/hr of total input rating of
all equipment in the enclosure.
2. Where communicating with the outdoors through
vertical ducts, each opening shall have a minimum
free area of 1 square inch per 4,000 Btu/hr of total
input rating of all equipment in the enclosure.
3. Where communicating with the outdoors through
horizontal ducts, each opening shall have a
minimum free area of 1 square inch per 2,000 Btu/hr
of total input rating of all equipment in the enclosure.
4. Where ducts are used, they shall be of the same
cross-sectional area as the free area of the opening
to which they connect.

Installation of the Exhaust and Air Intake System 10
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
10 Installation of the Exhaust and Air Intake System
A horizontal terminal body is included with every boiler.
Materials from the following manufacturers are
approved for use for exhaust venting materials and air
intake piping:
APPLICATION NOTICE !
Consult local and state codes pertaining to
special building code and fire department
requirements. Adhere to national code
requirements.
APPLICATION NOTICE !
Observe the listed maximum lengths of
vent system, which are boiler model
dependent. The maximum permissible
lengths are listed in Table 7, page 24 to
Table 9, page 25.
Manufacturer Exhaust venting piping 3“/ 4“
horizontal
Typ
vertical*
Typ
Heat fab SAF-T vent SAF-T vent
O-flex-L Star 34 -
Pro Tech FasNSeal -
Z-Flex Z-Flex, model
SVE -
Table 5 Approved exhaust vent pipe manufacturers
* Vertical „trough the roof“ configuration is not part of the standard
boiler package.
APPLICATION NOTICE !
Install vent pipe components per
manufacturer's instructions. Observe the
listed maximum diameters of vent system,
which are boiler model dependent. Use
only 3" or 4“ (4“ for model /62 only)
stainless steel (AL29-4C) components
(e.g. 37/44 kW = 3“) for exhaust vent
piping as listed in the above table
(Table 5).
Use only 4" flexible or 4" galvanized rigid
pipe for combustion air intake piping.
The exhaust and intake air piping
components are available from your local
wholesaler. Make sure to use matching
components.
NOTICE!
OPERATIONAL PROBLEMS !
due to strong winds.
The boiler will cease to operate under
strong winds when no termination tee is
installed at the end of the venting system.
zNote that a termination tee MUST
always be installed at the end of every
horizontal venting system.
zPurchase the suitable termination tee
together with your selected vent pipe
manufacturer for best fit.

18
We reserve the right to make any changes due to technical modifications!
Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Installation of the Exhaust and Air Intake System10
10.1 Installation of Horizontal Wall Terminal Body
Read these instructions first completely concerning
horizontal termination body installation and observe the
noted safety precautions.
The horizontal wall terminal body must be installed
through the wall according to previously mentioned
codes and/or local requirements.
zMake a 6" round opening in the outside wall at the
desired location. Refer to the information on the next
page regarding limitations of termination location.
zRemove fresh air connection end from the terminal
body and insert terminal body from the outside
through the round 6" hole in the wall (Fig. 8). Install
fresh air connection piece. Secure wall plate with 4
furnished screws to the wall.
zInsert a 2 or 3 foot straight exhaust pipe (Fig. 9,
Item. 2) from the outside into the wall terminal body.
Slide termination tee on exhaust pipe and seal joint
with silicone (Fig. 9, Item. 3). Orient termination tee
horizontally and observe the manufacturer's
installation instructions.
Fig. 8 Installation of horizontal wall terminal body
Fig. 9 Installation of exhaust pipe
Item. 1: wall terminal body
Item. 2: Exhaust vent pipe
Item. 3: Termination tee
12
3

Installation of the Exhaust and Air Intake System 10
19
We reserve the right to make any changes due to technical modifications!
Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
zInsert the vent pipe into the terminal body far enough
so that distance between the termination tee and the
wall is about 10" (Fig. 10).
zSecure both ends of the exhaust pipe through the
terminal body using the furnished locking collars.
(Fig. 10, Item. 1). Rotate collars downward and
secure set screw on locking collars (Fig. 11, Item. 2).
zSeal the space between vent pipe and locking collars
with silicone (Fig. 11, Item. 1).
A venting system that exits the structure through a
sidewall or the like, shall terminate at least 12 inches
above the ground.
The installation of a screened termination tee is
required to ensure trouble free operation and prevent
entry of foreign objects into the vent system.
The termination of the system shall be located at least
12 inches above the maximum snow line in geographic
areas where snow accumulates.
No changes or modifications are allowed in the venting
system. All components must be installed in their
original condition.
The termination shall not terminate less than 7 ft above
a paved sidewalk or driveway.
The termination shall be at least 6 ft away from the
combustion air intake of any other appliance.
Room air only:
The termination shall be at least 3 ft away from gas utility
meter, service regulator or the like (for room air
applications only).
The termination shall terminate at least 4 ft below, 4 ft
horizontally from, or 1 ft above any door, window, or
gravity air inlet into any building.
Fig. 10 Positioning of the termination tee
Item. 1: Locking collars
Item. 2: 4“ Air intake connection
1
1
2
Fig. 11 Vent pipe locking collars
Item. 1: Seal space with beads of silicone
Item. 2: Set screws
1
2

20
We reserve the right to make any changes due to technical modifications!
Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Installation of the Exhaust and Air Intake System10
10.2 Installation of Vertical Venting System
Follow all instructions concerning assembly of the
individual venting components. Follow in particular the
instructions furnished by the vent pipe manufacturer.
The combustion air is ducted in using a concentric 6" or
7“ pipe configuration in a vertical venting application
Fig. 12.
Observe the vent extension above the roof line as
shown in Fig. 12.
The maximum length of the concentric "through the roof"
venting is 10 ft. (see Fig. 12).
Observe the maximum length of the entire vent system
including the concentric piping based on Table 7,
page 24 to Table 9, page 25.
The concentric piping permits a zero clearance to
combustibles. Note, however, that the exhaust vent
pipe leading up to the concentric piping requires a 2"
minimum clearance to combustibles.
Install fire stop plates when penetrating the roof (Fig. 12,
Item. 2).
Fig. 12 Vertical venting system (sealed combustion)
Item. 1: Wall terminal body
Item. 2: Fire stop plate
Item. 3: Support of vent system
Item. 4: Condensate drain
1
2
3
3
4
NOTICE !
Only venting components and concentric
vent pipe manufactured by Heat-Fab type
SAF-T Vent can be used for vertical
venting applications. Please contact
Buderus Hydronic Systems,Inc. for
assistance in selecting proper venting
components.
NOTICE !
Ensure that a condensate drain is always
installed at the boiler exhaust connection.
Fig. 13 Vertical venting system (Room air only)
Item. 1: Roof termination
Item. 2: Fire stop plate
Item. 3: Support for vent system
Item. 4: Condensate drain
1
2
3
3
4