Bosch Therm 4300 Series - Burner Pressure Regulation; Gas Type Conversion

15
Adjustments (must be carried out only by qualified technicians)
Therm 4300 – 6 720 821 607 (2018/01)
6.2 Pressure regulation
Access to the adjuster screw
▶ Remove the appliance front cover ( see sec
tion 5.3).
Connection of manometer
▶ Loosen the shutter screw.
▶ Connect the manometer to the burner pressure measuring
po
int.
6720607418-01.3V
Fig. 12 Pressure measurement point
Maximum gas flow adjustment
▶ Remove the seal from the adjusting screw (Fig. 13).
▶ Turn on the heater with the power selector set to the left
(maximum positi
on).
6720607418-02.2V
Fig. 13 Maximum gas flow adjusting screw
▶ Open several hot water taps.
▶ Using the adjusting screw (Fig. 13), regulate the pressure
until achieving the values indicated in the table 7.
▶ Seal the adjusting screw once again.
Minimum gas flow adjustment
The minimum gas flow adjustment is
performed automatically after the
adjustment of the maximum gas flow.
Table 7 Burner pressure
Natural
gas H
Butane Propane
Injector code 11 8708202113
(110
)
8 708 202 130
(70)
8708202124
(120)
8708202128
(72)
14 8 708 202 113
(110
)
8708202128
(72)
8708202116
(125)
8708202132
(75)
18 8708202115
(115
)
8708202130
(70)
8708202116
(125)
8708202132
(75)
Connection
pressu
re (kPa)
11
14
18
2,0 2,8
3,7
Burner pressure 
MAX (kPa)
11 1,27 2,8 3,5
14 1,2 2,8
3,5
18 1,03 2,55 3,25
6.3 Conversion to a different type of gas
Only use the original conversion kits. 
The conversion must only be per
formed by a qualified
technician. The original conversion kits are supplied with
assembly instructions.