Adjusting The Minimum Flow (Parameter P2); Adjusting Pressure At The Burner (Parameter P0) - Bosch Optiflow Professional GWH12 Installation Manual

18 | Regulating the gas (only for authorised technicians)
▶ Loosen the test point screw of the air pressure test
point.[A]
▶ Connect the negative "-" side of the pressure gauge to the
air pressure test point.[A]
▶ Press until the display shows "P1".
▶ Press the button
Display will show "E".
▶ Press until the display shows "L1".
▶ Press the button
The appliance is now ready for adjustment of the maximum
gas flow.
▶ Open a hot water tap.
▶ Press or until the pressure gauge shows the
value indicated in tab. 13.
If it is not possible to reach the differential
pressure value:
▶ Adjust the pressure in the burner
(section 5.3.4) and repeat the
procedure for adjusting maximum flow.
▶ Press for 3 seconds.
The displayed value flashes as a sign of confirmation.
▶ Press .
Display will show "L1".
▶ Close the hot water tap.
▶ Press until the display shows "E".
▶ Press the button
Display will show "P1".
The adjustment of the maximum gas flow is complete.

5.3.3 Adjusting the minimum flow (Parameter P2)

▶ Press until the display shows "P2".
▶ Press the button
Display will show "E".
▶ Press until the display shows "L2".
▶ Press the button
▶ Open a hot water tap.
The appliance is now ready for adjustment of the minimum
gas flow.
▶ Press or until the pressure gauge shows the
value indicated in tab. 13.
If it is not possible to reach the differential
pressure value:
▶ Adjust the pressure in the burner
(section 5.3.4) and repeat the
procedure for adjusting minimum flow.
6 720 810 560 (2016/06)
.
.
.
.
.
▶ Press for 3 seconds.
The displayed value flashes as a sign of confirmation.
▶ Press .
Display will show "L2".
▶ Close the hot water tap.
▶ Press until the display shows "E".
▶ Press the button .
Display will show "P2".
▶ Simultaneously press the
seconds.
Display will show the temperature selected.
▶ Disconnect the pressure gauge from the test points [A] and
[B].
▶ Tighten the shutter screws of the test points [A] and [B].
The adjustment of the minimum gas flow is complete.
GWH12
Ø injector GWH16
GWH20
Dynamic
GWH12
connection
GWH16
pressure
GWH20
(kPa)
Burner GWH12
pressure GWH16
(kPa) - P0 GWH20
Differential
GWH12
pressure of
the burner GWH16
MAX (kPa) -
GWH20
P1
Differential
GWH12
pressure of
the burner GWH16
MIN (kPa) -
GWH20
P2
Table 13 Pressure of the burner

5.3.4 Adjusting pressure at the burner (Parameter P0)

Burner pressure adjustment is only required
if "L1" and "L2" cannot be achieved
according to table 13.
, and for 3
Natural gas H Universal
LP gas
1.7 1.3
2.0 + 1.7 1.5 + 1.3
1.13 2.75
0.12
0.46 - 0.50 0.63 - 0.67
0.37 - 0.41 0.63 - 0.67
0.33 - 0.37 0.44 - 0.49
0.05 - 0.08 0.05 - 0.08
0.05 - 0.07 0.05 - 0.07
0.04 - 0.08 0.05 - 0.08
Optiflow Professional