Buderus Logano GC 124 II User manual

7 747 000 510 – 07/2006 US For the user
Please read thoroughly before use.
User manual
Gas Boiler
Logano GC124 II/SP
WARNING!
If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or loss of life.
zDo not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS!
zDo not try to light any appliance.
zDo not touch any electrical switch; do
not use any phone in your building.
zImmediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
zIf you cannot reach your gas supplier,
call the Fire Department.
zInstallation and service must be per-
formed by a qualified installer, service
agency or gas supplier.
NOTICE: This manual must be retained for future reference.

For your Safety1
2User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
1 For your Safety
The Logano GC124 II/SP atmospheric gas boiler has
been designed and constructed using the newest tech-
nology available. User friendliness was taken into ac-
count during the design process. Following the safety
references and operating instructions will take advan-
tage of the economical and environmentally friendly de-
sign of your boiler.
1.1 Correct Use
The Logano GC124 II/SP atmospheric gas boiler is de-
signed to heat water for a hot water heating system for
heating single or multiple occupancy buildings.
1.2 Observe the following symbols
Symbols for identification of dangers and user instruc-
tions:
1.3 Observe the following guidelines
Property damage may occur if the boiler is not used
properly.
zDo not operate the boiler if damage is present.
zHave the heating system installed by a qualified in-
staller, service agency or gas supplier.
zHave the installer explain the operation of the heating
system.
zRead this user manual thoroughly.
1.3.1 Information on the boiler room
WARNING!
RISK TO LIFE
Identifies possible dangers originating
from the product, which might lead to seri-
ous injury or death if proper care is not
taken.
CAUTION!
RISK OF INJURY/
SYSTEM DAMAGE
Identifies potentially dangerous situations,
which might lead to medium or minor
injuries or to material losses if proper
caution is not followed.
USER NOTE
Guidelines for the optimum use and set-
ting of the control(s) plus other useful in-
formation.
WARNING!
RISK TO LIFE
due to neglecting your own safety in case
of emergency, such as with a fire.
zNever put yourself at risk. Your own
safety must always take priority.
WARNING!
RISK TO LIFE
from explosion of flammable gases.
zIf you smell gas there is a danger of
explosion.
zNo open flame! No smoking.
zPrevent spark formation. Do not
operate electrical switches, including
telephones, plugs or door bells.
zClose main gas valve.
zOpen doors and windows.
zWarn other occupants of the building,
but do not use door bells.
zLeave the building.
zCall gas company and fire department
from outside the building.
WARNING!
RISK TO LIFE
due to poisoning.
Insufficient ventilation or combustion air
availability may cause dangerous flue gas
leaks or formation.
zMake sure that inlets and outlets are
not reduced in size or closed.
zIf faults are not corrected immediately,
the boiler must not be operated until all
faults have been corrected.
WARNING!
FIRE DANGER
due to flammable materials or liquids.
zMake sure that there are no flammable
materials or liquids in the immediate
vicinity of the boiler.
zMaintain a minimum distance of
15 inches from the boiler.

For your Safety 1
3
We reserve the right to make any changes due to technical modifications.
User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
1.3.2 Performing work on the heating system
Other important information!
zDo not use this boiler if any part has been under wa-
ter. Immediately call a qualified service technician to
inspect the boiler and to replace any part of the con-
trol system and any gas control which has been un-
der water.
zShould overheating occur or the gas supply fail to
shut off, do not turn off or disconnect the electrical
supply to the pump. Instead shut off the gas supply
at a location external to the boiler.
zThe venting system must be inspected yearly. Re-
place any parts that show signs of deterioration from
corrosion or any other sources.
zThe boiler must be inspected yearly by a qualified
service agency. The inspection must include the
main burners, pilot burner, boiler flue, vent collector
and venting system. Replace any parts that show
signs of deformation from corrosion or other sources.
WARNING!
RISK TO LIFE
due to water damage.
zDo not use the boiler if any part has
been submerged in water.
zContact a qualified service technician
to check and replace any components
submerged in water.
CAUTION!
SYSTEM DAMAGE
due to freeze.
zMake sure the boiler room stays
above freezing.
WARNING!
RISK TO LIFE
from explosion of flammable gases.
zMake sure that a qualified company in-
stalls the boiler, connects gas and
venting connections, places the boiler
in operation, connects the electrical
power, and maintains and repairs the
boiler.

4User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
Product description2
2 Product description
The GC124 II and SP model boilers are low temperature
atmospheric gas-fired boilers.
The boilers consist of:
–Ignition module (only for GC124 II model) and Hon-
eywell aquastat
–Boiler jacket and front door
–Boiler block with insulation
–Gas burner
The ignition module and aquastat monitor and control all
electrical components of the boiler.
The boiler jacket prevents energy loss and acts as
soundproofing.
The boiler block transfers the heat generated by the
burner to the boiler water. The insulation prevents ener-
gy loss.
Fig. 1 Logano GC124 II and SP boiler
1Boiler front door
2Aquastat (boiler temperature control)
3Ignition module (only for GC124 II model)
4Boiler block with insulation
5Gas burner
6Boiler jacket
7 747 000 511-01.0K
6
1
5
3
4
2
GC124 II
GC124 SP
6
1
5
4
2

Start-up instructions 3
5
We reserve the right to make any changes due to technical modifications.
User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
3 Start-up instructions
Read the instructions and warnings on Îpage 2
before start-up for your safety.
WARNING!
RISK TO LIFE
due to not observing the start-up instruc-
tions and resulting incorrect operation.
zIf these instructions are not followed ex-
actly, a fire or explosion may be caused
with serious property damage or loss of
life or serious injury.
zObserve the start-up instructions.
USER NOTICE
GC124 II only:
This boiler is equipped with an electronic
ignition system which automatically will
light the pilot burner. Do not try to
maunally light the pilot burner.
GC124 SP only:
This boiler is equipped with a pilot burner
that must be lit by hand. Please follow the
instructions in ÎChapter 3.2, page 7,
when lighting the pilot burner.

6User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
Start-up instructions3
3.1 Operating instructions for GC124 II models
STOP! First read the safety instructions onÎpage 2
start-up warnings on Îpage 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.
4. Open the boiler front door.
5. Turn the gas control knob clockwise in the "OFF"
position. Do not use excessive force.
6. If you do not smell any gases, proceed to the next
step.
Fig. 2 Removing front door of boiler
WARNING!
RISK TO LIFE
Due to fire or explosion.
zNever use excessive force, when ad-
justing the gas control knob
(ÎFig. 3).
zAdjust the gas control knob only by
hand.
zNever use a tool for adjusting the gas
control knob.
zIf you can not turn the gas control knob
by hand, do NOT try to repair it.
zContact a qualified service organizati-
on at this point.
Fig. 3 Gas valve
1Gas control knob (shown in the "ON" position)
1
WARNING!
RISK OF LIFE
due to ignition of flammable gases.
zWait 5 (five) minutes until all gas odors
have disappeared. Check to see if any
gas odors remain, also at floor level. In
case gas odors are still present, shut off
gas supply, shut electrical power to the
boiler and inform the service organiza-
tion or local gas utility company.

Start-up instructions 3
7
We reserve the right to make any changes due to technical modifications.
User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
7. Turn gas control knob counterclockwise to ON
position. Do not use force.
8. Close boiler front door.
9. Open main gas supply.
10. Turn 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 turning off gas supply to boiler
(ÎChapter 3.3, page 10) and inform your customer
service technician or your gas company.
3.2 Operating instructions for GC124 SP models
STOP! First read the safety instructions onÎpage 2
start-up warnings on Îpage 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.
4. Open boiler front door.
USER NOTE
This unit is equipped with an automatic ig-
nition system which automatically starts
the pilot burner. Do not attempt to ignite it
manually.
Fig. 4 Removing front door of boiler

8User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
Start-up instructions3
5. Turn the gas control knob clockwise in the "OFF"
position. Do not use excessive force.
6. If you do not smell any gases, proceed to the next
step.
7. Open main gas supply.
8. Turn gas control knob (ÎFig. 5) clockwise to the
PILOT position.
9. Push and hold the red pilot ignition button (ÎFig. 5)
in.
WARNING!
RISK OF LIFE
Due to fire or explosion.
zNever use excessive force, when ad-
justing the gas control knob
(ÎFig. 5).
zAdjust the gas control knob only by
hand.
zNever use a tool for adjusting the gas
control knob.
zIf you can not turn the gas control knob
by hand, do NOT try to repair it.
zContact a qualified service organizati-
on at this point.
Fig. 5 Gasarmatur GC124 SP
1Gas control knob (shown in the "ON" position)
2"PILOT" position
3Red pilot ignition button
1
2
3
WARNING!
RISK OF LIFE
Due to ignition of flammable gases.
zWait 5 (five) minutes until all gas odors
have disappeared. Check to see if any
gas odors remain, also at floor level. In
case gas odors are still present, shut off
gas supply, shut electrical power to the
boiler and inform the service organiza-
tion or local gas utility company.
USER NOTE
This unit is equipped with an pilot burner
that must be ignited manually. Follow the
instructions below to light the pilot burner.

Start-up instructions 3
9
We reserve the right to make any changes due to technical modifications.
User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
10. Light the pilot burner with a match using the
furnished match holder. Insert the lit match through
the sight glass (ÎFig. 6).
11. After lighting the pilot, keep the red pilot ignition
button pressed in for an additional minute
(ÎFig. 7).
12. Release red pilot ignition button (ÎFig. 7). The red
pilot ignition button should move back and the pilot
burner should remain lit. If the pilot burner shuts off,
turn the gas control knob back to "OFF", and shut off
the main gas supply. Power done the heating
system and contact your heating service contractor
or gas utility company.
13. Turn gas control knob (ÎFig. 7) counterclockwise
to ON position. The gas control knob can only be set
to ON if the red pilot ignition button is out (ÎFig. 7).
14. Close boiler front panel.
15. Open main gas supply.
16. Turn on electric power to heating system.
17. Set thermostat to desired room temperature.
18. If the heating system does not start operating, follow
the instructions for "switching off gas supply to
boiler" (ÎChapter 3.3, page 10) and inform your
customer service technician or your gas company.
Fig. 6 GC124 SP boiler
1Sight glass
1
WARNING!
RISK TO LIFE
due to poisoning by leaking gas.
If the red pilot ignition button does not pop
up when you release it, you must proceed
with the following steps:
zWhen the pilot burner shuts off after re-
peated lighting attempts, you must shut
off the gas control knob to "OFF" to
avoid spillage of gas.
zShut off main gas supply.
zContact your service technician or gas
supplier immediately and have the fault
repaired.
Fig. 7 GC124 SP gas valve
1Gas control knob (shown in the "ON" position)
2Red pilot ignition button
1
2

10 User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
Start-up instructions3
3.3 Shutting off gas supply to boiler
1. Set thermostat (optional) to the lowest value.
2. Disconnect heating system from the power supply
before carrying out maintenance work.
3. Open boiler front door.
4. Turn gas control knob clockwise to the OFF position.
Do not use excessive force.
5. If necessary, shut off main gas supply.
6. Close boiler front door.
Flame roll-out switch
The boiler is equipped with a flame roll-out switch. If the
venting system of the boiler is blocked, the flame roll-out
switch will respond. Do not try to turn on the boiler. In-
form a qualified service company. The venting system of
the boiler must be checked for blockage and the flame
roll-out switch must be replaced. The flame roll-out
switch is for one-time use only. Do not try to use it again.
Fig. 8 Open boiler front door
Fig. 9 Gas valve (GC124 II left, GC124 SP right)
1Gas control knob (shown in the "ON" position)
11

Taking the heating system out of operation 4
11
We reserve the right to make any changes due to technical modifications.
User manual Gas Boiler Logano GC124 II/SP • Issue 07/2006
4 Taking the heating system out of operation
4.1 Normal system shut-down
1. Turn ON/OFF switch (emergency shutoff switch) to
OFF position. This shuts off power to the boiler and
all of its components (e.g. burner, aquastat).
2. Close gas shut off.
4.2 Emergency shut-down procedures
Perform this procedure in case of emergency:
1. Never put yourself at risk. Your own safety must
always take priority.
2. Shut off main gas supply.
3. Shut down the heating system using the boiler
emergency shutoff switch or the corresponding
circuit-breaker.
Fig. 10 System shut-down
1ON/OFF switch (emergency shut off switch)
1
CAUTION!
SYSTEM DAMAGE
due to freezing.
The heating system can freeze up in cold
weather if it is shut down.
zLeave the heating system switched ON
constantly as much as possible.
zProtect the heating system from freezing
by draining the boiler and water pipes at
the lowest point.

Your installer:
BBT Thermotechnik GmbH, D-35573 Wetzlar
www.heiztechnik.buderus.de
[email protected]
BBT North America Corporation - Bosch Group
50 Wentworth Ave
Londonderry, New Hampshire 03053 USA
Tel: [phone]-Buderus Fax: [phone]
www.buderus.net