Pressure Regulation; Conversion To A Different Type Of Gas - Bosch Therm 4300 Series Installation And User Instructions Manual

6.2

Pressure regulation

Access to the adjuster screw
▶ Remove the appliance front cover ( see section 5.3).
Connection of manometer
▶ Loosen the shutter screw.
▶ Connect the manometer to the burner pressure measuring
point.
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 position).
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.
Therm 4300 – 6 720 821 607 (2018/01)
Adjustments (must be carried out only by qualified technicians)
Minimum gas flow adjustment
Injector code
Connection
6720607418-01.3V
pressure (kPa)
Burner pressure 
MAX (kPa)
Table 7
6.3
Only use the original conversion kits. 
The conversion must only be performed by a qualified
technician. The original conversion kits are supplied with
assembly instructions.
6720607418-02.2V
The minimum gas flow adjustment is
performed automatically after the
adjustment of the maximum gas flow.
Natural
gas H
11 8708202113
(110)
8708202124
(120)
14 8 708 202 113
(110)
8708202116
(125)
18 8708202115
(115)
8708202116
(125)
11 2,0
14
18
11 1,27
14 1,2
18 1,03
Burner pressure

Conversion to a different type of gas

Butane Propane
8 708 202 130
(70)
8708202128
(72)
8708202128
(72)
8708202132
(75)
8708202130
(70)
8708202132
(75)
2,8 3,7
2,8 3,5
2,8 3,5
2,55 3,25
15