Buderus Logano GA124 SC User manual

6 720 804 891 – 2012/10 EN-US For the installer
Please read carefully before use.
Operating instructions
Sealed combustion boiler
Logano GA124 SC
WARNING!
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 vapors or liquids in
the vicinity of this system or any other
heating system.
IF A SMELL OF GAS IS DETECTED:
Do not switch on any electrical
appliances.
Do not operate electrical switches; do
not use a telephone in the building.
Call gas company immediately from
outside the building. Follow these
instructions.
If you cannot reach your gas
company, call the fire department.
The heating system must only be
installed and serviced by a qualified
service company, a qualified service
or gas supply company.
NOTE! Please keep these instructions for future reference.

For your safety1
2Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
We reserve the right to make any changes due to technical modifications.
1 For your safety
The Logano GA124 SC gas-fired boiler is designed and
manufactured in accordance with in state of the art in
technology and safety. Particular emphasis is placed on
ease of operation. We recommend reading and
following the safety instructions and operating manual
for safe, economical and environmentally responsible
operation of the heating system.
1.1 Correct use
The Logano GA124 SC gas-fired boiler is designed to
heat water using indirect domestic hot water tanks and
space for heating single or multi family buildings.
1.2 Notes structure
Additional symbols for identification of dangers and user
instructions.
1.3 Please observe these safety
instructions
Improper operation of the boiler may cause property
damage.
Only use the boiler for the intended purpose and only
if it is in perfect working order.
Have the heating system installed by a heating
contractor.
The contractor must give detailed instructions on the
operation of the heating system.
Please read these operating instructions carefully.
1.3.1 Boiler room
WARNING!
RISK TO LIFE
Identifies possible dangers emanating
from a product, which might lead to
serious injury or death if appropriate care
is not taken.
CAUTION!
RISK OF INJURY/
SYSTEM DAMAGE
Identifies potentially dangerous situations,
which might lead to medium or slight
injuries or to property losses.
USER NOTE
Information on optimum utilization and
setting of the control(s) plus other useful
information.
WARNING!
RISK TO LIFE
due to neglecting your own safety in case
of emergency, such in case of a fire.
Never put yourself at risk. Your own
safety must always take priority.
CAUTION!
BOILER DAMAGE AND OPERATING
DEFECTS
due to missing or inadequate openings for
combustion air and venting of the boiler
room.
Make sure that inlets and outlets are
not obstructed or blocked off.
If defects are not corrected
immediately, the boiler must not be
operated.
WARNING!
FIRE DANGER
due to flammable material or liquids.
Do not store flammable material or
liquids in the immediate vicinity of the
heat generator.
CAUTION!
SYSTEM DAMAGE
through frost.
Make sure that the boiler room is
protected from freezing.

For your safety 1
3
We reserve the right to make any changes due to technical modifications.
Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
1.3.2 Working on the heating system
Additional important system
Do not operate if any part is under water. Contact a
qualified customer service technician immediately to
have the unit checked and to replace the parts of the
control and gas fittings that were under water.
If the system overheats or the gas supply does not
shut off, do not switch off or interrupt the power to the
pump. Instead shut off the gas supply at a point
outside the heating system.
The flue system must be inspected and cleaned once
a year. All parts that show any signs of damage by
corrosion or other causes must be replaced.
The boiler must be serviced by qualified boiler
service company once a year. The inspection must
include the main burner, ignition burner, fan shroud,
combusion air tube, the complete flue system and
the venting openings or venting equipment. All parts
that show any signs of damage from corrosion or
other causes must be replaced.
WARNING!
RISK TO LIFE
from explosion of flammable gases.
Make sure that a qualified company
installs the boiler, connects gas, oil
and flue connections, places the boiler
in operation, connects the electrical
power, and maintains and repairs the
boiler.
Make sure that a licensed contractor
carries out all work on gas
transmission parts.

4Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
We reserve the right to make any changes due to technical modifications.
Product description2
2 Product description
The boilers are low temperature gas-fired boilers.
The boilers consist of:
–Automatic ignition module (GA124 SC only) and
Aquasmart control
–Boiler jacket and front panel
–Boiler block with insulation
–Burner
The automatic ignition and the Aquasmart control
monitor and control all electrical components of the
boiler.
The boiler jacket and invulation prevent energy loss and
provide soundproofing.
The boiler block transfers the heat generated by the
burner to the boiler water.
Fig. 1 Logano GA124 boiler
1Burner
2Boiler jacket
3Boiler block with insulation
4Aquasmart (control unit)
5Boiler front panel
1
3
5
2
4

Start-up instructions 3
5
We reserve the right to make any changes due to technical modifications.
Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
3 Start-up instructions
For your own safety read the instructions before
start-up.
A For GA124 SCI
This unit is with an ignition system that automatically starts
the burner. Do not attempt to ignite it manually.
BCheck for an odor of gas around the heating system. This
test must also be conducted at floor level, because some
types of gas are heavier than air and may accumulate at
floor level.
CSwitch on the ON/OFF switch on the gas valve by hand
only. Never use a tool as assistance. If you cannot actuate
the ON/OFF switch on the gas valve by hand, do not
attempt to repair it. Contact a qualified technician. Any
attempt to use force or to repair the switch may cause a fire
or explosion.
DDo not operate the unit if any part is under water. Contact
a qualified customer service technician immediately to
have the unit checked and to replace the parts of the
control and gas valve that were under water.
WARNING!
RISK TO LIFE
due to not observing the start-up
instructions and resulting incorrect
operation.
If these instructions are not followed
exactly, a fire or explosion may be
caused with serious property damage
or loss of life or serious injury.
Observe the start-up instructions.
WARNING!
DANGER OF EXPLOSION
If you smell gas, there is a danger of
explosion.
No open flame. No smoking.
Prevent spark generation.
Do not operate electrical switches,
telephones, plugs or door bells.
Close main gas valve.
Open doors and windows.
Warn other occupants of the building.
Evacuate the building.
Call gas company, heating service
company or fire department from
outside the building.

6Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
We reserve the right to make any changes due to technical modifications.
Start-up instructions3
3.1 Operating instructions for GA124 SC
STOP! First read the safety instructions on
page 5 of these instructions.
1. Set thermostat to the lowest value.
2. Disconnect the heating system from the power
supply.
3. Shut off main gas supply valve.
4. Remove screws from the left and right side panels,
then lift the front panel off the boiler and pull it
forward.
5. Turn gas valve ON/OFF button clockwise to OFF
position. Do not use force.
6. Wait five (5) minutes until all gas residues have
dissipated. Check whether there is still any smell of
gas, including at floor level. If there is a gas odor:
STOP! Follow instructions in section "B" of the safety
instructions in (Chapter 3, page 5). If there is no
sign of a gas odor, continue with the next step.
7. Turn gas valve ON/OFF switch counterclockwise to
ON position. Do not use force.
8. Attach front panel of boiler (Fig. 3).
9. Open main gas supply shut-off.
10. Switch on electric power to heating system.
11. Set thermostat to desired room temperature.
12. If the heating system does not start operating, follow
the instructions for "switching off gas supply to
boiler" (Chapter 3.2, page 7) and inform your
service technician or your gas supply company.
Fig. 2 Removing front panel of boiler
Fig. 3 Gas valve
1ON/OFF button on gas valve
1
USER NOTE
This unit is fitted with an ignition system
that automatically starts the pilot burner.
Do not attempt to ignite it manually.

Start-up instructions 3
7
We reserve the right to make any changes due to technical modifications.
Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
3.2 Shutting off gas supply to boiler
1. Set thermostat to the lowest value.
2. Disconnect heating system from the power supply
before carrying out maintenance work.
3. Remove front panel of boiler
4. Turn gas valve ON/OFF button clockwise to OFF
position. Do not use force.
5. If necessary, shut off main gas supply shut-off.
6. Replace front panel of boiler.
Flame roll-out switch
The boiler is equipped with a flame roll-out switch. If the
flue duct in the boiler is blocked, the flame roll-out switch
responds. Do not try to switch on the boiler. Inform a
qualified service company. The flue duct in the boiler
must be checked for blockage and the flame roll-out
switch replaced. The flame roll-out switch is for one-time
use only, and cannot be reused.
Fig. 4 Remove front panel of boiler
Fig. 5 Gas valve (GA124 SC)
1ON/OFF button (at ON position)
1

8Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
We reserve the right to make any changes due to technical modifications.
Shutting down of the boiler4
4 Shutting down of the boiler
4.1 Normal boiler shut-down
1. Switch off ON/OFF switch ("OFF" position). This
shuts down the boiler with all components
(e.g. burner).
2. Additional shut-down procedure follow the
directions supplied with Aquasmart.
3. Shut off main fuel supply valve.
4.2 Emergency shut-down
Inform your customer of the procedure in case of
emergency, such as a fire.
1. Never put yourself at risk. Your own safety must
always take priority.
2. Shut off main fuel supply valve.
3. Shut down the heating system with the heater
emergency switch or the corresponding circuit-
breaker.
Fig. 6 Shutting down heating system (with aquasmart)
1ON/OFF switch (main switch)
1
CAUTION!
SYSTEM DAMAGE
through frost.
The heating system can freeze up in cold
weather if it is shut down.
Leave the heating system switched ON
constantly as much as possible.
Protect the heating system from freezing
by draining the heater and water pipes
at the lowest point.

Shutting down of the boiler 4
9
We reserve the right to make any changes due to technical modifications.
Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10

Notes
10 Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10
We reserve the right to make any changes due to technical modifications.

Notes
11
We reserve the right to make any changes due to technical modifications.
Operating instructions Logano GA124 SC special gas-fired boiler • Issue 2012/10

Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel. [phone]
Fax [phone]
www.buderus.us
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.