
Operating Instructions
Low-temperature
oil boiler
DANGER!
If these instructions are not followed exactly, a fire
or explosion may be caused with serious property
damage or loss of life and serious injury.
Do not store or use gasoline or any other flammable liquids or vapors in the vicinity of this system or
any other heating system.
6 720 804 873-00.1T
Logano G115 WS US/CA
6 720 804 873 (2012/10) EN-US
C

Contents
Contents
1 General safety instructions and explanation
of symbols 3
1.1 Explanation of symbols 3
1.2 Safety instructions 3
2 Product description 4
2.1 Intended use 4
2.2 Certification and testing mark 4
2.3 Disposal 4
2.4 Product description 4
3 Commissioning the heating system 5
3.1 Turning the heating system on 5
3.2 Checking the operating pressure, topping up
the boiler water and bleeding air from the system 5
3.2.1 Checking the operating pressure 5
3.2.2 Topping up the boiler water and bleeding
the system 5
3.3 Starting the heating system using the controls 6
3.4 Turning the heating system off 6
3.5 Action in an emergency 6
3.6 Operating tips 6
3.7 Why is regular servicing important? 7
4 Troubleshooting 7
4.1 Identifying operating modes and resetting faults 7
Logano G115 WS US/CA – 6 720 804 873 (2012/10)2

General safety instructions and explanation of symbols
1 General safety instructions and explanation of symbols
1
1.1 Explanation of symbols
Warnings are indicated by a warning triangle and a grey
background.
Signal words are used to indicate the level of risk if counter measures are
not taken.
• Caution indicates that minor damage to property may occur.
• Warning indicates that minor personal injury or severe damage to
property may occur.
• Danger means that severe personal injury may occur. Very serious
cases may result in death.
Notes are identified in the text by this symbol. They are
separated by horizontal lines above and below the text.
Notes contain important additional information.
Notes do not contain any warnings or information about hazards or risks.
1.2 Safety instructions
If you smell flue gas
B Switch off the boiler (Æ page 6).
B Open windows and doors.
B Inform an authorized heating contractor.
Installation
B Correct and proper installation and adjustment of the burner and the
controls are the fundamental requirements for safe and economical
operation of the boiler.
B The boiler may only be installed or converted by an approved heating
contractor.
B Do not modify any parts that carry flue gas.
B The hot water tank may only be used for heating domestic hot water.
B Never shut off safety valves!
Water must be able to escape from the safety valve for the hot water
system and piping when the water is being heated.
Maintenance and servicing
Heating systems should be regularly maintained for the following
reasons:
• to maintain a high level of efficiency and to operate the system
economically (low fuel consumption),
• to achieve a high level of operational reliability,
• to maintain the cleanest combustion.
B sign a maintenance and servicing contract with an approved heating
contractor covering annual servicing and maintenance.
B The flue system must be inspected once a year. Have all parts that
show any signs of damage from corrosion or other causes replaced.
B The boiler must be serviced by qualified boiler service company once
a year. Servicing must include the burner, the entire flue and
combustion air system and any air inlet/outlet vents. All parts that
show any signs of damage from corrosion or other causes must be
replaced.
Recommendation for users:
B Servicing and repairs may only be carried out by a trained heating
contractor.
B Have any faults immediately corrected in order to prevent damage to
the system.
B The operator is responsible for the general and environmental safety
of the heating system.
B Use only genuine Buderus spare parts. Damage caused by the use of
parts not supplied by Buderus is not covered by the Buderus
warranty.
Danger by failing to consider your own safety in an emergency such
as a fire
B Never put yourself at risk. Your own safety must always take the
highest priority.
Dangers posed by explosive and flammable materials
B Any work on components that carry oil may only be carried out by a
certified heating contractor.
B Do not use or store flammable (paper, thinners, paints, etc.) near the
boiler.
B Maintain a clearance of at least 16 inches from the boiler.
Risk of poisoning. Insufficient ventilation may cause dangerous flue
gas leaks.
B Never close off or reduce the size of air inlet or outlet vents.
B The boiler must not be operated until the obstruction has been
removed.
Risk of water damage
B
Do not use the appliance if any part of it has been under water.
B Call in a qualified customer service technician immediately to check
the appliance and replace any controls that have been under water.
Combustion air
B Keep the combustion air free of corrosive substances (e. g.
halogenated hydrocarbons that contain chlorine or fluorine
compounds). In that way you will prevent corrosion.
Instructing the operator
B The operator must read the information on how the boiler works and
have the heating system installer explain how to operate it.
Logano G115 WS US/CA – 6 720 804 873 (2012/10) 3