Page 1
Operating Instructions
Low-temperature
oil/gas boiler
WARNING: If installation, adjustment, modification, oper-
ation or maintenance of the heating system is carried out
by an unqualified person, this may result in personal injury
or property damage.
Precisely follow the instructions of this manual.
If support or additional information is required, contact a
qualified service company, service provider or the gas
company.
WARNING:
Observe the safety instructions of this manual before
commissioning the heating device.
The operating manual is a component of the technical
documentation and must be handed over to the operator
of the heating system. The handling of the heating system
according to the operating manual must be explained to
the owner or operator. Make sure that he has been familiarized with all information required for the operation of the
heating system.
Logano G315
Low temperature boilers for
oil/gas fired power burners
NOTICE: In the Commonwealth of Massachusetts this
appliance must be installed by a licensed plumber and
gas fitter.
This manual is available in the English and French language.
Please keep this manual for future reference.
For users
Please read carefully
before use.
6 720 647 204 (12/2010) US/CA
Page 2
Contents
Contents
1 Explanation of symbols and safety
information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . . . . . 3
2 Product description . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Correct use . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Certification and testing mark . . . . . . . . . . 5
2.3 The correct fill and make-up water . . . . . . 6
2.4 The correct fuel . . . . . . . . . . . . . . . . . . . . . 7
3 System start-up . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Making the system operational . . . . . . . . . 8
3.2 Check and correct the operating
pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1 Checking the operating water pressure 8
3.2.2 Fill water and bleeding the system . . . . . . 8
3.3 Starting up the control panel and the
burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Shutting down the system . . . . . . . . . . . . . . . 10
4.1 Switching off the control panel and the
burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Shutting down the system in an
emergency . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Correcting burner faults . . . . . . . . . . . . . . . . . 11
2
Logano G315 - Subject to technical modifications
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Explanation of symbols and safety information
1 Explanation of symbols and safety information
1
1.1 Explanation of symbols
Warnings
Warnings are indicated in the text by a
warning triangle and a gray background.
In case of danger from electric shock, the
exclamation point on the warning triangle is
replaced with a lightning symbol.
Signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if
measures for minimizing damage are not taken.
• NOTICE indicates that minor damage to property may
occur.
• CAUTION indicates possible minor to medium
personal injury.
• WARNING indicates possible severe personal injury.
• DANGER indicates that severe personal injury may
occur.
Important information
Important information that presents no risk to
people or property is indicated with this
symbol. It is separated by horizontal lines
above and below the text.
Additional symbols
Symbol Meaning
B
Æ
• Listing/list entry
– Listing/list entry (2nd level)
Tab. 1
Sequence of steps
Cross-reference to other points in this
document or to other documents
1.2 Safety instructions
Danger from failing to consider your own safety in
an emergency such as a fire
B Never risk your own life. Your own safety must always
take the highest priority.
Risk due to oil leaks
B When using oil as the fuel, national regulations hold
the operator responsible for immediately calling a
specialist contractor to remedy oil leaks the moment
they are discovered.
If you smell gas
B Close the gas shut-off valve.
B If you hear gas escaping, evacuate the affected area
immediately.
B Open the windows.
B Do not operate any electrical switches or equipment
such as telephones, power plugs and doorbells.
B Extinguish all open flames.
B Do not smoke.
Do not use lighters.
B Warn all occupants of the building, but do not ring
doorbells.
B Call your gas utility company and your local heating
contractor from outside the building. If necessary,
notify police or the fire department.
If you smell flue gas
B Switch off the appliance.
B Open windows and doors.
B Inform a trained and certified heating contractor.
Danger of electrical shock
B Before carrying out any work on the heating system,
disconnect all poles of the heating system by activating
the emergency shutoff switch outside the boiler room
or disengaging the heating system circuit breaker.
B It is not sufficient just to switch off the controller.
B Take measures to ensure that the heating system
cannot be accidentally reactivated.
Logano G315 - Subject to technical modifications
Risk of damage due to operator error
Operator errors can result in personal injury and damage
to property.
B Ensure that children never operate this appliance
unsupervised or play with it.
B Ensure that only people who know to operate this
appliance correctly have access to it.
3
Page 4
1
Explanation of symbols and safety information
Installation, conversion
Insufficient ventilation may cause dangerous flue gas
leaks.
B Only have the appliance installed or modified by a
trained and certified heating contractor.
B Never change any parts in contact with flue gas.
B Do not cover or reduce the size of ventilation openings
in doors, windows and walls. If draft-proof windows are
fitted, ensure there is an adequate supply of air to the
room for combustion.
B Ensure that the boiler installation room remains free
from the risk of frost.
B The heating system must be installed and operated in
accordance with the applicable rules of technology as
well as national, regional and local code.
B Do not hang up laundry to dry in the boiler room.
Inspection and maintenance
Heating systems should be regularly maintained for the
following reasons:
• to achieve a high level of efficiency and to operate the
system economically (low fuel consumption),
• to achieve a high level of operational safety,
• to maintain the cleanest combustion.
B Recommendation for customers: Sign a
maintenance and inspection contract with a trained
and certified contractor, covering an annual inspection
and demand-dependent maintenance.
B The operator is responsible for the general and
environmental safety of the heating system.
B Immediately correct all faults to prevent system
damage.
B Use only original Buderus spare parts. Damage caused
by the use of spare parts not supplied by Buderus are
excluded from the Buderus warranty.
Instructing the customer
B Instruct customers about the functions and operation
of the appliance.
B Inform the customer that they must not carry out any
modifications or repairs.
B Only use the boiler for its intended purpose and only
when it is in working order.
Disposal
B Dispose of packaging in an environmentally
responsible manner.
B All heating system components that have to be
replaced should be disposed of in environmentallyresponsible manner at an authorized disposal site.
The right fuel
This system requires the correct fuel to ensure a proper
operation. During commissioning, your system installer
will enter the correct type of fuel, which your system
requires, into the table below (Æ Chapter 2.4, page 7).
Danger of water damage
B Do not use the appliance if any part of it has been
under water.
B Call in a trained and certified heating contractor
immediately to check the appliance and replace any
electrical or gas valve components that have been
under water.
Other important information
B If the system overheats or the gas supply does not shut
off, do not switch off or disconnect the power supply to
the pump. Instead, shut off the gas supply somewhere
else to the heating system.
Explosive and easily combustible materials
B Never use or store easily flammable materials (paper,
thinners, paints etc.) near the appliance.
Combustion air/room air
B Keep the supply of combustion/room air free of
corrosive substances (e.g. halogenated hydrocarbons
that contain chlorine or fluorine compounds). This will
help prevent corrosion.
B Prevent heavy accumulation of dust.
4
Logano G315 - Subject to technical modifications
Page 5
2 Product description
The oil/gas fired boiler Logano G315 has been
developed and built employing the latest technologies
and safety regulations.
Particular emphasis is placed on ease of operation.
Please observe the safety instructions and the operating
instructions to ensure optimum safe, economical and
environmentally-friendly operation of your system.
The main components of the Logano G315 oil/gas fired
boiler are:
•Boiler block (Æ Fig. 1, [3])
The boiler block transfers the heat generated by the
burner to the heating water.
• Boiler shell (jacket Æ Fig. 1 and 2, [1]), thermal
insulation (Æ Fig. 1, [2]).
The boiler jacket and thermal insulation prevent energy
loss.
• Control panel (Æ Fig. 1, [4])
The control panel is designed to monitor and control all
electrical components of the oil/gas fired boiler
Logano G315.
4
2
1
Product description
2
1
1
6 720 642 622-02.1o
Fig. 2 Front jacket
1 Boiler shell (jacket)
2.1 Correct use
The Logano G315 is designed for heating boiler water
and water heating. Any other purpose is considered
improper use. Any resulting damage is excluded from the
manufacturer's warranty.
The Logano G315 can be operated with oil, gas, and
combination burners. For a list of the approved burners,
please contact Bosch Thermotechnology Corp.
This boiler can be operated with an aquastat, the
Logamatic 4000, and other control systems.
3
1
Fig. 1 Oil/gas fired boiler Logano G315
1 Boiler shell (jacket)
2 Thermal insulation
3 Boiler heat exchanger
4 Control panel
Logano G315 - Subject to technical modifications
2.2 Certification and testing mark
This appliance has been tested and certified and meets all
applicable standards for the US and Canadian markets.
6 720 642 622-01.1o
5
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2
Product description
2.3 The correct fill and make-up water
Note the fundamental system-specific water quality
requirements.
Water designation
Water is used as the heat transfer medium in your heating
system. Depending on its purpose, the water is given
different descriptions.
•Heating water:
Water contained within your heating system.
• Fill water:
Water used for the first filling of your system before
start-up.
• Make-up water:
Water used for filling up the heating system in case of
water loss.
Water quality requirements
All water contains substances, e.g. Ca (HCO
(calcium
3)2
hydrogen carbonate) that could affect the operation of
your heating system. These can cause corrosion, scale
formation or deposits potentially affecting the system's
service life and/or system efficiency.
To ensure your heating system always operates
economically, properly and safely, not to mention in an
energy-efficient manner, we recommend that you regularly
monitor the quality of the fill and make-up water and treat
it accordingly as and when necessary.
NOTICE: System damage from corrosion or
scale formation as the result of using fill and
make-up water that does not conform to the
system-specific requirements.
B Ask your trained and certified installer or
local water company what the
concentration of Ca (HCO
(calcium
3)2
hydrogen carbonate) is in your area.
B If the fill and make-up water does not meet
system-specific requirements, it will have
to be treated. Consult your trained and
certified installer if this is the case.
Ca (HCO3)2
concentration /
Overall boiler output
MBH (kW)
341 < Q ≤1,194
(100 < Q
1,194 < Q ≤3412
(350 < Q
341 < Q
(100 < Q
1,194 < Q ≤3412
(350 < Q
≤
≤
1000)
≤
1,194
≤
≤
1000)
350)
350)
grains per gallon
(mol/ppm)
≤
11.7 (≤200)
≤
8.8 (≤150)
> 11.7 (> 200)
> 8.8 (> 150)
Maximum fill and make-up water quantity
V
V
max
§·
V
©¹
Tab. 2 Requirements for fill, make-up and heating water
For the correct use and treatment of the fill and make-up
water, the contents of the following table MUST be
observed.
Heating water
V
/ gallon ( m³)
max
= three times system volume 8.2–9.5
max
QMBH()
-----------------------------------------------
01818
max
⋅,=
Ca HCO
-------------------------------------------------- -
⋅,=
313
()2ppm()
Ca HCO
gr
§·
3
3
2
-------
©¹
gal
()
QkW()
pH value
8.2–9.5
6
Logano G315 - Subject to technical modifications
Page 7
2.4 The correct fuel
To ensure it operates properly, the heating system
requires fuel of the correct type and grade.
NOTICE: Risk of system damage from use of
incorrect fuel.
B Only use the fuel specified. The correct
fuel is entered in Æ Tab. 3 by the heating
contractor.
Use the following fuel:
Product description
2
Stamp/Signature/Date
Tab. 3 Fuel to be used (entered by heating system
installer)
We recommend you seek the advice of your
system installer if you intend changing the
fuel for your system.
Logano G315 - Subject to technical modifications
7
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3
System start-up
3 System start-up
This chapter explains how you prepare the system for
operation and how to commission the control panel and
the burner.
3.1 Making the system operational
You should check the following to prepare the system for
operation:
B Operating water pressure of the system
(Æ Chapter 3.2)
B Fuel is supplied and the main fuel shut-off valve is open
B Heating system emergency shutoff switch set to ON
Ask your heating contractor to show you where the fill
valve for your heating system (boiler return) is located.
3.2 Check and correct the operating
pressure
Your heating system must contain sufficient water to
ensure the functionality of your system.
NOTICE: Risk of system damage due to
frequent filling up.
B If you need to add water frequently, the
heating system may be damaged by
corrosion and scale buildup depending on
the water quality.
B Bleed the heating system. If necessary, fill
with make-up water.
B Check the heating system for leaks and
the correct operation of the expansion
vessel.
B Notify your heating contractor if you find
the need to fill your heating system
frequently.
If the operating pressure in the system is too low, fill makeup water into your system (Æ Chapter 2.3, page 6).
• Recently added fill or make-up water loses much of its
volume in the first few days because it releases gases.
With newly filled heating systems, initially check the
operating pressure daily and then in ever increasing
intervals.
All factory default settings will have already been made by
the heating contractor when the system was first
commissioned.
3.2.1 Checking the operating water pressure
The operating water pressure must be at least 15 psi
(1 bar).
B Read the current operating pressure and temperature
( °F ( °C)) on the temperature/pressure gauge.
B If the operating pressure drops below 15 psi (1 bar), fill
up the heating water.
7 747 019 141-17.1RS
Fig. 3 Pressure/temperature gauge
3.2.2 Fill water and bleeding the system
Let your local heating contractor show you
where the boiler fill and drain valve for filling
up and draining the heating water is located
on your heating system.
B Slowly fill the heating system via the on-site fill valve.
During filling, observe the display (pressure gauge).
B Once the desired operating pressure is reached, stop
the procedure.
B Bleed the heating system via the purge valves.
B Add fill water again if the operating pressure drops as
a result of bleeding the system.
Air pockets may form in the heating system
from the fill or make-up water releasing
gases.
• Once the system is losing minimal volume, check the
operating pressure of the heating water once a month.
8
Logano G315 - Subject to technical modifications
Page 9
3.3 Starting up the control panel and the
burner
Start your boiler via the control panel (Æ Fig. 4). By
starting the control panel, you also automatically enable
the burner. The burner is then fired by the control panel.
For further details, see the operating instructions of the
relevant control panel or burner.
B Switch the boiler water thermostat (Æ Fig. 4, [1]) to
"AUT."
B Set the ON/OFF switch (Æ Fig. 4, [2]) to "I" (ON).
1
2
System start-up
3
6 720 642 624-03.1O
Fig. 4 Control panel (for example: Logamatic 4000)
1 Boiler water thermostat
2 ON/OFF switch
Follow the control panel operating
instructions.
Logano G315 - Subject to technical modifications
9
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4
Shutting down the system
4 Shutting down the system
This chapter explains how you shut down your boiler and
switch off the control panel and the burner. Furthermore,
it contains details on how to shut down your heating
system in an emergency.
NOTICE: Risk of system damage from
freezing.
B The system can freeze up if it is out of
service, e.g. from a shutdown because of
fault(s).
B Protect your system against frost damage
where temperatures below freezing are
expected.
B Drain the heating water at the lowest point
in the system, using the KFE tap (boiler fill
and drain valve). To do this, open the
purger at the highest point in the system.
B Shut off the fuel supply at the main fuel shut-off valve.
4.1 Switching off the control panel and
the burner
Shut down your boiler via the control panel (Æ Fig. 4). The
burner is automatically shut down when the control panel
is switched off.
B Set the ON/OFF switch (Æ Fig. 4, [2]) to "0" (OFF).
For further details on this subject, see the
operating instructions for the relevant control
panel.
4.2 Shutting down the system in an
emergency
Only in emergencies, switch off the system
using the emergency shutoff switch or by
disengaging the heating system circuit
breaker.
In other dangerous situations, immediately close the main
fuel shut-off valve and the power supply of the heating
system using the emergency shutoff switch or by
disengaging the heating system circuit breaker
(Æ Chapter 1.2, page 3).
10
Logano G315 - Subject to technical modifications
Page 11
5 Correcting burner faults
Heating system faults are shown on the control panel
display. You will find detailed information regarding fault
displays in the service instructions for the relevant control
panel. The burner fault is also indicated by a fault lamp on
the burner.
NOTICE: Risk of system damage from
freezing.
B The system can freeze if it is out of service,
e.g. from a shutdown because of fault(s).
B If the system remains switched off for
several days because of a fault shutdown,
you should drain the heating water via the
KFE tap at the lowest point in the system
to protect it against freezing.
B Press the burner reset button (see burner operating
instructions).
NOTICE: Risk of system damage due to too
many resets.
B The burner ignition transformer may be
damaged if you press the reset button
more than three times in succession when
the burner refuses to start.
B Do not attempt to remedy the fault by
pressing the reset button more than three
times in succession.
Correcting burner faults
5
If the burner does not restart after three attempts, refer to
the technical documentation provided with the burner to
find out how to reset it.
Logano G315 - Subject to technical modifications
11
Page 12
United States and Canada
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel. 603-552-1100
Fax 603-584-1681
www.buderus.us
U.S.A.
Products manufactured by
Bosch Thermotechnik GmbH
Sophienstrasse 30-32
D-35576 Wetzlar
www.buderus.com
Bosch Thermotechnology Corp. reserves the right
to make changes without notice due to continuing
engineering and technological advances.
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