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Adjusting The Minimum Flow (Parameter P2); Adjusting Pressure At The Burner (Parameter P0) - Bosch Optiflow GWH16 3 CT E23 F6 L S2405 Installation Manual

Gas continuous flow water heaters
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16 | Regulating the gas (only for authorised technicians)
▶ 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 table 10.
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.
▶ 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 completed.

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 table 10.
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.
▶ 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".
6 720 817 545 (2016/02)
.
.
.
.
.
▶ 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.
GWH16
Ø injector
GWH20
GWH26
Dynamic
GWH16
connection
GWH20
pressure
GWH26
(kPa)
Burner
GWH16
pressure
GWH20
(kPa) - P0
GWH26
Differential
GWH16
pressure of
the burner
GWH20
MAX (kPa) -
GWH26
P1
Differential
GWH16
pressure of
the burner
GWH20
MIN (kPa) -
GWH26
P2
Table 10 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. 10
▶ Enter the Service menu by pressing and holding down the
,
, and
seconds.
Display will show "P2".
▶ Press
until the display shows "P0".
▶ Press the button
.
▶ Open a hot water tap.
With the pressure gauge connected, let the value measured
stabilise.
▶ Press
or
until the pressure gauge shows the
value indicated in table 10.
,
and
for 3
Natural gas H
LPG
1.7
1.25
10 x 2.0
10 x 1.5
5 x 1.7
5 x 1.3
2.0
1.55
1.13
2.75
0.12
0.22 - 0.28
0.25 - 0.32
0.21 - 0.26
0.26 - 0.32
0.21 - 0.29
0.18 - 0.26
0.03 - 0.06
0.04 - 0.06
0.03 - 0.05
0.05 - 0.07
0.02 - 0.05
0.03 - 0.06
buttons simultaneously for 3
Optiflow

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