Bosch HGD745256N Quick start guide

03
261293
ÚInstructions for connecting gas and gas conversion (for
After-Sales Service only) ......................................................2
éAanwijzing voor de gasaansluiting en -omschakeling
(Alleen voor de klantenservice) .........................................12

2
ÚTable of contents ÚInstructionsforconnectinggasandgasconversion(forAfter-SalesServiceonly)
Measures to note ....................................................................... 2
Selecting a connection side .............................................................2
Gas connection.......................................................................... 3
Approved connections.......................................................................3
Types of connection ...........................................................................3
Natural gas connection (NG)............................................................3
Liquid gas connection (LPG) ............................................................4
Conversion to a different gas type........................................... 4
Converting to a different gas type ...................................................4
Functional parts for the gas conversion.........................................4
Replacing the burner nozzles...........................................................5
Adjusting or replacing the burner bypass screws and setting
the small flame ....................................................................................5
Converting the appliance from natural gas to liquefied gas ......5
Conversion from liquid gas to natural gas.....................................5
Removing the control panel..............................................................6
Replacing bypass screws .................................................................6
Installing the control panel................................................................7
Replacing the oven burners (optional) ...........................................7
Leak test and function test ....................................................... 8
Check the gas connection ................................................................8
Checking the burner nozzles............................................................8
Checking the bypass valves.............................................................8
Checking the oven burner nozzle (option).....................................8
Check the grill burner nozzle (option) ............................................8
Correct flame formation ............................................................ 9
Burner ...................................................................................................9
Oven ......................................................................................................9
Technical properties - gas ........................................................ 9
Measures to note
The appliance may only be converted to a different gas type
by an approved specialist, in accordance with the
instructions in this manual.
Incorrect connection and incorrect settings may cause
serious damage to the appliance. The appliance
manufacturer accepts no liability for damage and
malfunctions of this kind.
Pay close attention to the symbols indicated on the rating plate.
If there is no symbol for your country, follow the technical
guidelines that apply in your country when making settings.
Before setting up the appliance, determine the gas type and
pressure in the local supply network. Before using the
appliance for the first time, make sure that all settings have
been made correctly.
Pay attention to local and international rules and regulations.
All connection data can be found on the rating plate on the rear
of the appliance.
Enter the data in the following table:
Product number (E no.),
Manufacturing number (FD),
Enter the factory settings for gas type/gas pressure, as well as
the settings for gas type/pressure that apply after the gas
conversion, in the following table.
The changes made to the appliance and the type of connection
play an important role in ensuring that the appliance operates
correctly and safely.
Selecting a connection side
The gas can be connected on either the right or the left. If
necessary, you can change the connection side.
Shut off the main gas supply.
If the gas is to be connected on the opposite side, the screw
fastening (size 22 key) on the gas connection that is not in use
must be fitted with a blind cap (size 24 key) and a new sealing
ring.
Once the connection side has been changed, a leak test must
be performed. See the section entitled "Leak test".
Note: A torque spanner must be used when the gas is
connected.
E no. FD no.
After-sales serviceO
Type of gas / gas pressure
Data on the rating plate
Type of gas / gas pressure
Data after gas conversion
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Gas connection
Approved connections
These instructions apply only when the appliance is set up in
countries that are indicated on the rating plate.
If the appliance is set up, connected and used in a country that
is not indicated on the rating plate, installation and assembly
instructions must be used that contain data and information on
the valid connection conditions in the relevant country.
Types of connection
Natural gas connection (NG)
When natural gas (NG) is used, gas is connected via a gas
pipe or a safety hose using a connecting piece with a screw
thread at each end.
Connection in accordance with EN ISO 228 G^ (TS EN ISO
228 G^ )
1. Place the new seal on the connecting piece. Make sure that
the seal is correctly seated.
2. Attach the connecting piece (with a size 24 key) to the end of
the gas connection (with a size 22 key).
3. Attach the threaded connection on the gas pipe or the safety
hose (with a size 24 key) to the connecting piece using a
new seal and tighten this.
4. To perform a leak test, see the section entitled "Leak test".
Open the gas supply.
Notes
■*G^: EN ISO 228 G^(TS EN ISO 228 G^)
■A torque spanner must be used when the gas is connected.
Connection in accordance with EN 10226 R^ (TS 61-210 EN
10226 R^ )
1. Place the new seal on the connecting piece. Make sure that
the seal is correctly seated.
2. Attach the connecting piece (with a size 24 key) to the end of
the gas connection (with a size 22 key).
3. Attach the threaded connection on the gas pipe or the safety
hose (with a size 24 key) to the connecting piece and tighten
this.
4. To perform a leak test, see the section entitled "Leak test".
Open the gas supply.
Notes
■*R^: EN 10226 R^(TS 61-210 EN 10226 R^)
■A torque spanner must be used when the gas is connected.
Country EN 10226
R^
(TS 61-210
EN 10226
R^)
EN ISO 228
G^
(TS EN ISO
228 G^)
AT Austria X
BE Belgium X
CH Switzerland X
DE Germany X
ES Spain X X
FR France X
GR Greece X
IT Italy X X
NL Netherlands/Holland X
PT Portugal X X
HR Croatia
SL Slovenia
YU Serbia
TR Turkey X X
PL Poland X
RO Romania X X
AE United Arab Emirates X
ZA South Africa X
HU Hungary X
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Liquid gas connection (LPG)
Caution!
Follow country-specific guidelines.
If liquid gas (LPG) is used, the gas connection is established
via a gas hose or a fixed connection.
If a gas hose is used, pay attention to the following measures:
■Use a safety hose or plastic hose (8 or 10 mm diameter).
■Secure it to the gas connection with a connecting device (e.g.
a hose clamp).
■The hose must be short and fully leakproof. The hose must
not be longer than 1.5 m. Pay attention to current guidelines.
■The gas hose must be replaced annually.
1. Place the new seal on the connecting piece. Make sure that
the seal is correctly seated.
2. Attach the connecting piece (with a size 24 key) to the end of
the gas connection (with a size 22 key).
3. Insert the safety hose and tighten using a screw coupling or
hose clamp.
4. To perform a leak test, see the section entitled "Leak test".
Open the gas supply.
Note: A torque spanner must be used when the gas is
connected.
Conversion to a different gas type
Converting to a different gas type
■The gas connection must be replaced.
■The burner nozzles must be replaced.
■Depending on the factory gas setting, the bypass screws in
the burner valves must either be replaced, or screwed in fully.
■If present, the oven and grill nozzles must also be replaced.
Numbers are printed on the nozzles indicating their diameter.
Further information about the gas types suitable for the
appliance, as well as the corresponding gas nozzles, can be
found in the section entitled "Technical properties - gas".
After the conversion
■After the appliance has been converted to a different gas
type, you must perform a leak test. See the section entitled
"Leak test".
■After the appliance has been converted to a different gas
type, the correct flame formation must be tested. See the
section entitled "Correct flame formation".
■Enter the newly-set type of gas and gas pressure in the table.
See the section entitled "Measures to be observed".
Caution!
After the appliance has been converted to a different gas type,
the labels giving information on the gas type and showing a
star must be affixed at the appropriate point on the rating plate
MAKE SURE THAT YOU DO THIS.
Functional parts for the gas conversion
The functional parts that are required for the gas conversion in
accordance with the instructions are displayed below.
You will find the correct nozzle diameters in the table in the
section entitled "Technical properties - gas".
Always use new seals.
The gas connecting piece to be used may vary depending on
the gas type and country-specific regulations.
(*) These functional parts must be used when the gas is
connected.
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Bypass screw
Burner nozzle
(*) Seal

5
Replacing the burner nozzles
1. Turn off all switches on the control panel.
2. Shut off the gas supply.
3. Remove the pan supports and burner parts.
4. Remove the burner nozzles (Allen key 7).
5. To identify the burner nozzles, see the table in the section
entitled "Technical properties - gas".
Insert the new nozzles in the corresponding burners.
Once the nozzles have been replaced, perform a leak test. See
the section entitled "Leak test".
Adjusting or replacing the burner bypass
screws and setting the small flame
The bypass screws regulate the minimum flame height of the
burners.
Preparation
Shut off the gas supply.
: Risk of electric shock!
Interrupt the power supply to the appliance.
1. Turn off the switches on the control panel.
2. Remove the control knobs individually by holding tightly on to
the control panel and pulling them straight out.
Converting the appliance from natural gas to
liquefied gas
If the appliance was set to natural gas at the time of delivery
(factory setting) (NG: G20, G25) and is now being converted to
liquefied gas for the first time (LPG: G30, G31):
For models with safety pilot:
In order to reach the bypass nozzles, the control panel must be
removed. See the section "Removing the control panel".
The bypass nozzles must be tightened as far as they will go.
You must then carry out the work steps in the section "Installing
the control panel".
For models with gas oven (optional):
In order to reach the bypass nozzle underneath the burner tap,
you must remove the control panel. See the section "Removing
the control panel".
The bypass nozzle on the oven burner must be tightened as far
as it will go.
You must then carry out the work steps in the section "Installing
the control panel".
Conversion from liquid gas to natural gas
If the appliance is to be converted from liquid gas
(LPG: G30, G31) to natural gas (NG: G20, G25), or this
conversion has already been performed and is now to be
reversed:
All bypass nozzles on the appliance must be replaced. To do
this, read the section entitled "Removing the control panel".
The instructions in the section entitled "Replacing the bypass
screws" must then be followed.
Then, follow the instructions in the section entitled "Attaching
the control panel".
(*) Connecting piece for natural
gas
(NG: G20, G25)
TS 61-210 EN 10226 R^
EN 10226 R^
(*) Connecting piece for natural
gas
(NG: G20, G25)
TS EN ISO 228 G^
EN ISO 228 G^
(*) Connecting piece for liquid gas
(LPG: G30, G31)
Gas connecting piece
Dummy plug (shut-off piece)
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Removing the control panel
1. If applicable, remove the top cover on the appliance. To do
this, hold the cover securely on both sides with both hands
and pull it upwards. The top cover will release. Take care not
to lose the hinges.
2. Remove the pan support and burner parts.
3. Remove the two screws (T20) at the front left and right of the
hob plate. Do not remove the plastic pieces underneath.
4. For models with a wok burner (optional): Loosen the 4 torx
screws (M4) on the work burner.
5. Hold the hob plate at the front and lift it no more than 30°.
Support the hob plate with the appropriate device, which is
set up on the front burner mounting plate.
6. Remove the cover caps on the front left and right profiles
(without scratching the surface). Loosen the screws
underneath (T20).
7. Remove the control knobs (T15) and unscrew the two screws
(M4) on the control panel.
8. Grip the front panel with both hands and lift it carefully.
Release the front panel from the retainers. Then, carefully fold
the panel forwards. Make sure that the cables are not
damaged and the connections are not detached.
Replacing bypass screws
1. Loosen the bypass screws with a flat screwdriver (no. 2).
Remove the bypass screws.

7
2. You can use the table to determine the new bypass screws
that you will need after the gas conversion. See the section
entitled "Technical properties - gas".
3. Check whether the seals on the bypass screw are correctly
seated and work precisely. Only use bypass screws with
intact seals.
4. Insert the new bypass screws and tighten them. Make sure
that all bypass screws are connected to the correct shut-off
valves.
5. At this point, it is essential to carry out a leak test. See the
section entitled "Leak test".
Installing the control panel
Install in reverse order.
1. Grip the panel with both hands and slowly fit it into place.
Ensure that the cables are not damaged and the connections
do not come loose. Lower it slightly and place it in the
fastening lugs.
2. Reinsert the screws (T15) (M4) which were removed from the
panel.
3. Reinsert and tighten the screws (T20) which were removed
from the front profiles on the right and left. Refit the plastic
cover.
4. Carefully reinstall the hob. Make sure that the plastic parts
which must remain underneath the screws do not fall out.
Screw the two screws (T20) on the front left and right on the
hob back in.
5. For models with wok burner (optional): Screw the 4 Torx
screws (M4) which you removed from the wok burner back
in.
6. If the appliance has a hob cover, hold it vertically by both
sides and slowly reinsert it into the holder.
7. Install the burner bases in their respective positions
according to their size. Make sure that the ignition plugs are
placed in the appropriate openings next to the burner bases.
Place the burner lids in the centre of the matching burner
bases.
8. Refit the pan support grid or wire rack. Ensure that the pan
support with a span of 80 mm is fitted on the auxiliary burner.
9. Fit the control knobs carefully.
10.At this stage, you must check the burning behaviour of the
gas burners. See the section "Safe burning behaviour".
11.Check whether the appliance is functioning correctly.
Replacing the oven burners (optional)
Preparation
Turn off all switches on the control panel.
Shut off the gas supply.
: Risk of electric shock!
Interrupt the power supply to the appliance.
Replacing the nozzle for the oven burner
1. Open the oven door.
2. Loosen the front securing screw in the bottom plate.
3. Hold the bottom plate firmly at the front, lift and remove it.
4. Loosen the burner securing screw and carefully remove the
oven burner. The burner nozzles are now freely accessible.
Make sure that the thermocouple and ignition plug
connections are not damaged.
5. Release the nozzle at the burner access on the rear side of
the oven (using a 7 mm socket wrench).
6. You can use the table to determine the new nozzle that you
will need after the gas conversion. See the section entitled
"Technical properties - gas".
7. Insert and tighten the new nozzle.
8. At this point, it is essential to carry out a leak test. To perform
a leak test, see the section entitled "Leak test".
9. Replace the oven burner, making sure that the thermocouple
and ignition plug connections are not damaged. Retighten
the securing screw.
10.At this point, it is important to check the burner flame
formation. See the section entitled "Correct flame formation".
11.Replace the bottom plate.
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Replace the nozzle for the grill burner (optional)
1. Open the oven door.
2. Loosen the screw connecting the grill burner to the grill
burner mounting plate and carefully pull the burner straight
out. Make sure that the thermocouple and ignition plug
connections are not damaged. The burner nozzles are now
freely accessible.
3. Release the grill burner nozzle (7 mm socket wrench).
4. You can ascertain which new nozzle is required for the new
gas type using the table. See the section entitled "Technical
properties - gas".
5. Insert and tighten the new nozzle.
6. At this point, it is essential to carry out a leak test. To perform
a leak test, see the section entitled "Leak test".
7. Replace the grill burner, making sure that the thermocouple
and ignition plug connections are not damaged. Retighten
the screws.
8. Slide the seal fully into the burner.
9. At this point, it is important to check the burner flame
formation. See the section entitled "Correct flame formation".
Leak test and function test
: Risk of explosion!
Avoid sparking. Do not use an open flame.
Perform the leak test only with a suitable leakage spray.
In the event of a gas leak
Shut off the gas supply.
Ensure that the room affected is well ventilated.
Check the gas and valve connections again. Repeat the leak
test.
The leak test must be performed by two people, in accordance
with the following instructions.
Check the gas connection
1. Open the gas supply.
2. Spray the gas connection with a leakage spray.
If small bubbles or foam form, indicating a gas leak, follow the
instructions in the section entitled "In the event of a gas leak".
Perform the same steps for the part closed with the blind plug.
Checking the burner nozzles
1. Open the gas supply.
Carry out the leak test separately for each nozzle.
2. Carefully close the hole in the burner nozzle to be checked
using your finger or a suitable device.
3. Spray the nozzle with a leakage spray.
4. Press the function selector and turn it anti-clockwise. This
supplies the nozzle with gas.
If small bubbles or foam form, indicating a gas leak, follow the
instructions in the section entitled "In the event of a gas leak".
Checking the bypass valves
1. Open the gas supply.
Carry out the leak test separately for each bypass screw.
2. Carefully close the hole in the burner nozzle to be checked
using your finger or a suitable device.
3. Spray the nozzle in the burner to be checked with a leakage
spray.
4. Push the control knob and turn it anti-clockwise. This supplies
the nozzle with gas.
If small bubbles or foam form, indicating a gas leak, follow the
instructions in the section entitled "In the event of a gas leak".
Checking the oven burner nozzle (option)
1. Open the gas supply.
2. Carefully close the hole in the oven burner nozzle using your
finger or a suitable device.
3. Spray the nozzle with a leakage spray.
4. Press the function selector and turn it anti-clockwise. This
supplies the nozzle with gas.
If small bubbles or foam form, indicating a gas leak, follow the
instructions in the section entitled "In the event of a gas leak".
Check the grill burner nozzle (option)
1. Open the gas supply.
2. Carefully close the hole in the grill burner nozzle using your
finger or a suitable device.
3. Spray the nozzle with a leakage spray.
4. Turn the oven function selector clockwise. This supplies the
nozzle with gas.
If small bubbles or foam form, indicating a gas leak, follow the
instructions in the section entitled "In the event of a gas leak".
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9
Correct flame formation
Burner
The flame formation and temperature development must be
checked for each burner after the appliance is converted to a
different gas type.
In the event of a problem, compare the nozzle values to the
values in the table.
Only for models without safety pilot
1. Ignite the hob burner as described in the operating
instructions.
2. Check the large and small flames for the correct flame
formation. The flame must burn evenly and continuously.
3. Using the burner knob, switch quickly between the large and
small frame. Repeat this process a few times. The gas flame
must not flicker or go out.
Only for models with safety pilot
1. Ignite the hob burner as described in the operating
instructions.
2. Turn the burner knob to the small flame setting.
Check whether the ignition is activated by holding the knob in
the "small flame" position for approximately 1 minute.
3. Check the large and small flames for the correct flame
formation. The flame must burn evenly and continuously.
4. Using the burner knob, switch quickly between the large and
small frame. Repeat this process a few times. The gas flame
must not flicker or go out.
Oven
Lower gas burner or grill burner (optional)
1. Ignite the lower gas burner as described in the operating
instructions.
2. Check the flame formation with the oven door open:
The flame must burn evenly throughout (it may be slightly
uneven in the first few minutes, but after a few minutes, the
flames should burn constantly).
3. To check that the thermocouple is functioning correctly, let
the appliance run for a few minutes.
If necessary, check the settings. If it is not functioning
correctly, replace the bypass screw in the burner.
Technical properties - gas
Here, you will find a list of the different gas types and
corresponding values.
Nozzle values for the auxiliary burner
Nozzle values for the standard burner
*G20/
G25
G20 G20 G25 G25 G30/G31 **G30 G25.1 G27 G30
Gas pressure (mbar) 20/25 20 25 20 25 28-30/37 50 25 20 37
Nozzle (mm) 0,72 0,72 0,68 0,77 0,72 0,50 0,43 0,72 0,77 0,47
Bypass screw (mm) 0,50 0,50 0,50 0,50 0,50 0,30 0,30 0,50 0,50 0,30
Max. input power (kW) 1 1 1 1 1 1 1 1 1 1
Max. input power (kW) ≤0.55 ≤0.55 ≤0.55 ≤0.55 ≤0.55 ≤0.55 ≤0.55 ≤0.55 ≤0,55 ≤0,55
Gas discharge for 15 °C and 1,013 mbar m³/
h
0,095/
0,111
0,095 0,095 0,111 0,111 - - 0,111 0,116 -
Gas discharge for 15 °C and 1,013 mbar g/h - - - - - 73 73 - - 73
* For France and Belgium
** For G30 (50 mbar), the nozzle set HEZ298070 must be ordered from the service centre.
*G20/
G25
G20 G20 G25 G25 G30/G31 **G30 G25.1 G27 G30
Gas pressure (mbar) 20/25 20 25 20 25 28-30/37 50 25 20 37
Nozzle (mm) 0,97 0,97 0,91 1 0,94 0,65 0,58 0,94 1,00 0,62
Bypass screw (mm) 0,58 0,58 0,58 0,58 0,58 0,38 0,38 0,58 0,58 0,38
Max. input power (kW) 1,75 1,75 1,75 1,75 1,75 1,75 1,75 1,75 1,75 1,75
Max. input power (kW) ≤0.9 ≤0.9 ≤0.9 ≤0.9 ≤0.9 ≤0.9 ≤0.9 ≤0.9 ≤0,9 ≤0,9
Gas discharge for 15 °C and 1,013 mbar
m³/h
0,167/
0,194
0,167 0,167 0,194 0,194 - - 0,194 0,203 -
Gas discharge for 15 °C and 1,013 mbar g/
h
- - - - - 127 127 - - 127
* For France and Belgium
** For G30 (50 mbar), the nozzle set HEZ298070 must be ordered from the service centre.

10
Nozzle values for the wok burner (optional)
Nozzle values for the high output burner (optional)
Nozzle values for the gas grill burner (optional)
*G20/
G25
G20 G20 G25 G25 G30/G31 **G30 G25.1 G27 G30
Gas pressure (mbar) 20/25 20 25 20 25 28-30/37 50 25 20 37
Nozzle (mm) 1,35 1,35 1,20 1,45 1,40 0,96 0,75 1,40 1,46 0,90
Bypass screw (mm) 0,88 0,88 0,88 0,88 0,88 0,55 0,55 0,88 0,88 0,55
Max. input power (kW) 3,6 3,6 3,6 3,6 3,6 3,6 3,6 3,6 3,6 3,6
Max. input power (kW) ≤1.7 ≤1.7 ≤1.7 ≤1.7 ≤1.7 ≤1.7 ≤1.7 ≤1.7 ≤1,7 ≤1,7
Gas discharge for 15 °C and 1,013 mbar
m³/h
0,342/
0,398
0,342 0,342 0,398 0,398 - - 0,398 0,418 -
Gas discharge for 15 °C and 1,013 mbar g/
h
- - - - - 261 261 - - 261
* For France and Belgium
** For G30 (50 mbar), the nozzle set HEZ298070 must be ordered from the service centre.
*G20/
G25
G20 G20 G25 G25 G30/G31 **G30 G25.1 G27 G30
Gas pressure (mbar) 20/25 20 25 20 25 28-30/37 50 25 20 37
Nozzle (mm) 1,16 1,16 1,10 1,34 1,21 0,85 0,75 1,21 1,38 0,80
Bypass screw (mm) 0,75 0,75 0,75 0,75 0,75 0,46 0,46 0,75 0,75 0,46
Max. input power (kW) 3 3 3 3 3 3 3 3 3 3
Max. input power (kW) ≤1.3 ≤1.3 ≤1.3 ≤1.3 ≤1.3 ≤1.3 ≤1.3 ≤1.3 ≤1,3 ≤1,3
Gas discharge for 15 °C and 1,013 mbar
m³/h
0,285/
0,332
0,285 0,285 0,332 0,332 - - 0,332 0,348 -
Gas discharge for 15 °C and 1,013 mbar g/
h
- - - - - 218 218 - - 218
* For France and Belgium
** For G30 (50 mbar), the nozzle set HEZ298070 must be ordered from the service centre.
*G20/G25 G20 G20 G25 G25 G30 **G30 G25.1
Gas pressure (mbar) 20/25 20 25 20 25 28-30 50 25
Nozzle (mm) 1,00 1,00 0,98 1,13 1,10 0,70 0,62 1,10
Bypass screw (mm) - - - - - - - -
Max. input power (kW) 2,1 2,1 2,1 2,1 2,1 2,1 2,1 2,1
Max. input power (kW) - - - - - - - -
Gas discharge for 15 °C and 1,013 mbar
m³/h
0,2/0,233 0,2 0,2 0,233 0,233 - - 0,233
Gas discharge for 15 °C and 1,013 mbar
g/h
- - - - - 153 153 -
* For France and Belgium
** For G30 (50 mbar), the nozzle set HEZ298070 must be ordered from the service centre.