Buderus Logano GA124-17 User manual

6301 4201 – 03/2005 US For the contractor
Please read these instructions carefully
Instructions for High Altitude
Conversion
Sealed Combustion
Gas Boiler Logano GA124
Required Sealevel Input Rates
GA 124–17
70 MBtu/hr
GA 124–23
94 MBtu/hr
GA 124–30
123 MBtu/hr
Warning!
This conversion kit shall be installed by
a qualified service agency in
accordance with the manufacturer's
instructions and all applicable codes
and requirements of the authority
having jurisdiction and in accordance
with the requirements of the CAN/CSA
B149.1 or CAN/CSA B149.2 installation
codes.
Warning!
Please observe the instructions
regarding conversion from natural gas
to propane.
This kit and instructions are for converting the GA124 model Boilers to high
altitude operation.
Notice! Save these instructions for later use.

Instructions for High Altitude Conversion
2
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 • Issue 03/2005
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
1 Safety Considerations
Please observe the following safety instructions.
1.1 Application purpose
This kit and instructions are for high altitude converting
the GA124 model boiler over 8500 ft.
1.2 Guideline of Notices
Two levels of danger are identified by the following
warning labels:
1.3 Observe the following symbols
2 Parts List for High Altitude
Conversion
–This kit contains the following parts:
–Main orifices and gaskets.
–Conversion data plate to be filled out and affixed to
the appliance.
–Conversion instructions.
–Technical documents.
WARNING!
DANGER
Denotes a possible severely dangerous
situation where, without proper caution,
bodily injury or loss of life may result.
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.
 Work only on gas components when
you have a license to do so.
 Note 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 technican.
WARNING!
DANGER
due to electricity.
 Prior to doing any work on the heating
system, disconnect all electrical power
to the boiler at the emergency switch.
 It is NOT sufficient to shut off only the
boiler control!

Instructions for High Altitude Conversion
3
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
3 High Altitude Conversion over 8500 feet
For your safety, read these instructions before
converting the boiler.
To convert the boiler for use at high altitude, the
following instructions shall be adhered to:
The boiler shall be converted prior to installation.
1. If the boiler has been in operation, shut off the main
gas valve. If the boiler has not been placed into
service, go to step 3.
2. Turn off all electric power to the appliance and set
the thermostat to its lowest setting.
3. Remove jacket panel screws (Fig. 1, Item. 1) from
left and right side, tilt forward top of front jacket panel
(Fig. 1, Item. 2) then lift up from the bottom and
remove.
4. Turn the gas control manual knob (Fig. 2, Item. 1)
clockwise to the "OFF" position. Do not use
excessive force.
Fig. 1 Removal of front jacket panel
Item. 1: jacket panel screws
Item. 2: front jacket panel
1
2
WARNING!
DANGER
When these instructions are not followed.
 When the boiler must be converted to
Propane, you should first convert the
boiler from natural gas to propane by
following the Propane Conversion Kit
Instructions. Afterwards convert the
boiler to high altitude.
Fig. 2 Gas control
Item. 1: gas control knob (set to position „ON“)
1
WARNING!
DANGER
For explosion due to gas.
 Wait five (5) minutes to clear out any
gas. Then smell for gas, including near
the floor. If you smell gas, STOP!
Follow "B" instructions in the safety
information printed on page 8. If you do
not smell gas, go to the next step.

Instructions for High Altitude Conversion
4
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
Change out main orifices
5. Disconnect pilot line (Fig. 3, Item. 8) from the gas
control (Fig. 3, Item. 3).
6. Disconnect ignitor cable (Fig. 3, Item. 4) from the
S8600 ignition module (Fig. 3, Item. 5).
7. Secure the gas supply pipe (Fig. 3, Item. 10) with a
wire or rope (Fig. 3, Item. 6) on the control panel of
the boiler controls (Fig. 3, Item. 7).
8. Disconnect union (Fig. 4, Item. 2) between gas
valve and manifold. Place the gasket from the union
in a safe place.
9. Label the flame roll-out switch wires and disconnect
the wires from the flame roll-out switch (Fig. 4,
Item. 3).
10. Remove the burner tray cover plate screws and
remove this cover plate (Fig. 4, Item. 4).
11. Remove burner tray mounting nuts (Fig. 4, Item. 1)
and take entire burner tray from boiler.
12. Loosen air intake hose (Fig. 3, Item. 9) and pull from
burner box.
Fig. 3 Front view
Item. 1: flame roll-out switch
Item. 2: union on gas supply pipe
Item. 3: gas control valve
Item. 4: ignition cable
Item. 5: ignition control module
Item. 6: support wire or rope
Item. 7: boiler control panel
Item. 8: pilot gas tubing
Item. 9: air supply pipe
Item. 10:gas supply pipe
1
4
2
5
7
8
9
3
6
10
NOTICE
For the conversion to high altitude, you
only need to change out the main orifices
and not the pilot orifice.
Fig. 4 Gas burner
Item. 1: burner tray mounting nuts
Item. 2: union
Item. 3: flame roll-out switch
Item. 4: burner tray cover plate
1
3
4
2
1
DANGER!
DANGER
Wiring errors can cause improper and
dangerous operation.
 Label all wires prior to disconnecting
when servicing controls.

Instructions for High Altitude Conversion
6
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
for leaks by applying a soap and water solution. If
no leaks are found, go to step 25. If any leaks are
found, shut off the main gas shut off valve.
24. Repair leaks and repeat step 23.
25. Shut off the main gas supply shut-off valve. Remove
the line pressure tapping plug (Fig. 7, Item. 2) from
the gas control. Install a test fitting, and hook up a
manometer to measure the supply pressure.
26. Remove the manifold pressure tapping plug (Fig. 7,
Item. 3) from the gas control. Install a test fitting and
hook up a manometer to measure the manifold
pressure.
27. Open the main gas piping shut off valve and
measure the supply pressure to the boiler. The
supply pressure must be between 4.7 and 10.5
inches of water column for natural gas or 11 and 13
inches water column for propane. If the pressure is
not between 4.7 and 10.5 inches water column for
natural gas (or 11 and 13 inches of water column for
propane), when the boiler is running, call your
service technician or gas supplier.
28. Follow the lighting instructions on the next page.
Fig. 7 Gas control valve
Item. 1: gas control knob (set to position „ON“)
Item. 2: supply pressure test port
Item. 3: manifold pressure test port
3
2
1

Instructions for High Altitude Conversion
7
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
3.1 Lighting Instructions
For your safety, read before lighting.
A) This appliance is equipped with an ignition device
which automatically lights the pilot. Do not try to light
the pilot by hand.
B) Check for smell of gas around the appliance area.
Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
C) Use only your hand to turn the gas control knob (Fig.
9, Item 1). Never use tools. If the knob will not turn
by hand, don't try to repair it, call a qualified service
technician. Force or attempted repair may result in
a fire or explosion.
D) Do not use this appliance if any part has been under
water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
WARNING!
WARNING !
If you do not follow these instructions
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
 Follow these operating instructions.
WARNING!
DANGER !
What to do if you smell gas:
 No open fire! Do not smoke!
 Avoid formation of sparks! Do not
touch any electric switch, phone,
electric plug or bell!
 Shut off main gas supply.
 Open windows and doors!
 Notify all occupants!
 Leave the building!
 Immediately call your gas supplier,
heating contractor or fire department
from a phone outside the building!

Instructions for High Altitude Conversion
8
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
4 Operating Instructions
STOP! Read the safety precautions on page 7 of this
manual.
1. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you smell
gas, STOP! Follow "B" in the safety information on
page 7. If you do not smell gas, go to the next step.
2. Locate the pilot assembly by looking through the
access viewing port (Fig. 8, Item. 1) on the burner
front plate.
3. Turn the gas control knob (Fig. 9, Item. 1)
counterclockwise to „ON“.
4. Turn on the electrical power to the appliance.
5. Set the thermostat to the desired setting to activate
the boiler.
6. The ignition control should initiate sparking at the
pilot. The pilot should light and then the main
burners should light. If the main burners do not light,
shut off the main gas piping shutoff valve. Shut off
all electric power to the appliance and call your
service technician or gas supplier.
7. If the main burners light, then the gas fittings, union
and orifices must be tested for leaks with a soap and
water solution. If no leaks are found then go to step
9. If any leaks are found, turn off gas control knob
(Fig. 9, Item. 1) clockwise to "OFF". Turn off all
electric power to the appliance, set the thermostat to
lowest setting.
8. Repair leaks. Repeat steps 1 through 7.
9. Check the supply pressure while the boiler is
running. Pressure must be between 4.7 and 10.5
inches WC for natural gas or 11 and 13 inches WC
for propane gas. Record supply pressure on the
boiler start-up procedure.
Fig. 8 Burner tray box
Item. 1: viewing port
1
Fig. 9 Gas control
Item. 1: gas control knob (set to position „ON“)
Item. 2: test port screw for gas supply measurement
Item. 3: test port screw for manifold pressure measurement
Item. 4: protective screw for pilot pressure adjustment
Item. 5: protective screw for manifold pressure adjustment
1
2
3
4
5

Instructions for High Altitude Conversion
9
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
10. Check manifold pressure. Set the manifold pressure
according to the values in Table 3. To adjust the
manifold pressure (Fig. 9, Item. 5), remove the
capscrew from the gas control. Turn the pressure
regulating adjusting screw clockwise to increase, or
counterclockwise to decrease the manifold
pressure. This adjustment must be made while the
boiler is in operation.
.11. After adjustment, record pressure in the start-up
procedure, and install the capscrew on the gas
control (Fig. 9, Item. 5).
12. Observe the pilot flame (Fig. 10, Item. 2) through
viewing port (Fig. 8, Item. 1) in the burner cover
plate. The flame should envelop the flame sensor ½
- 1-½inch, see (Fig. 10, Item. 1). If the pilot flame is
satisfactory then go to step 13. If the pilot flame is
too small or too large, adjust the pilot using pilot
adjustment. Turn the inner adjustment screw
(Fig. 9, Item. 4) clockwise to decrease, or
counterclockwise to increase the pilot flame. After
adjustment, replace the cover screw and tighten
firmly (Fig. 9, Item. 4).
13. Observe the main burner flame (Fig. 11, Item. 1)
through the viewing port (Fig. 8, Item. 1) in the
burner cover plate. The flame should have a
smooth, firm contour and must be mostly blue in
color. If the main flame is satisfactory, go to step 14.
If the main burner flame is lazy, yellow, or lifting off
the burners, turn the gas control knob (Fig. 9,
Item. 1) clockwise to "OFF". Shut off the main gas
piping shutoff valve. Disconnect all electric power to
the appliance and call your service technician or gas
supplier.
14. The ignition safety shutoff must be tested. Test the
safety shutoff by shutting off the main gas piping
shutoff valve. The main burner and pilot flame
(Fig. 10, Item. 2) will extinguish. Within six (6)
seconds the gas control main gas solenoid should
close and make an audible sound. The ignition will
spark.
After 90 seconds, the module should go into lock out
mode and the spark should stop. Disconnect the
electric power to the appliance. Open the main gas
shutoff valve. Turn on the electric power to the unit.
A normal operating sequence should occur. If the
gas control functions satisfactorily then go to step
15. If the gas control does not function satisfactorily,
immediately turn the gas control knob (Fig. 9,
Item. 1) clockwise to "OFF". Shut off the main gas
GA124 Natural gas
[inch W.C.]
Propane
[inch W.C.]
17 3.6 8.9
23 3.6 9.9
30 3.5 9.5
Table. 3 Required manifold pressure
Fig. 10 Proper pilot setting
Item. 1: 1/2“to 1-1/2“
Item. 2: flame
1
2
Fig. 11 Main burner flame profile
Item. 1: flamelet profile
1

Instructions for High Altitude Conversion
10
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de
piping shutoff valve. Disconnect all electric power to
the appliance and call your service technician or gas
supplier.
15. Turn the gas control knob (Fig. 12, Item. 1)
clockwise to „OFF“.
16. Shut the main gas piping shutoff valve.
17. Turn off electric power to the appliance, and set the
thermostat to the lowest setting.
18. Remove the pressure test fittings from the gas
supply and manifold pressure tabs in the gas control
and replace the plugs.
19. Repeat steps 1 to 6, and 13 to place the appliance
back in operation. Check the plugs in the gas control
with a soap and water solution. If no leaks are found
go to step 21. If any leaks are found, shut off the
main gas piping shutoff valve and turn off all electric
power to the appliance and turn the gas control knob
clockwise to "OFF" (Fig. 12, Item. 1).
20. Repair leaks. Open the main gas shutoff valve and
repeat step 19.
21. Wash off the soap and water solution used to test for
leaks to ensure no corrosive effects from the soap.
22. Check the high limit aquastat operation to ensure
that it shuts off the boiler when the boiler water
temperature reaches the setpoint of the aquastat.
Record on start-up procedure form.
23. Replace the front boiler jacket panel.
Fig. 12 Gas control
Item. 1: gas control knob
1

Notice
11
We reserve the right to make any changes due to technical modifications!
Instructions for high altitude conversion for sealed combustion gas boiler GA124 •Issue 03/2005
Buderus Heiztechnik GmbH •http://www.heiztechnik.buderus.de

BBT North America Corporation
50 Wentworth Avenue
Londonderry, NH 03053
Tel: [phone] ● Fax: [phone]
www.buderus.net
BBT North America Corporation reserves the right to make changes without notice
due to continuing engineering and technological advances.
Heating Contractor:
PRODUCTS MANUFACTURED BY
BBT Thermotechnik GmbH
35573 Wetzlar
www.buderus.de