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Adjusting The Maximum Flow (Parameter P1); Adjusting The Minimum Flow (Parameter P2) - Bosch Therm 4000 S Installation And Operating Manual

Gas instantaneous water heaters
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18 | Regulating the gas (only for qualified contractors)
A
Fig. 17
[A] Air pressure head in the box
[B] Gas pressure head in the burner

7.3.2 Adjusting the maximum flow (Parameter P1)

▶ Connect the appliance on the ON/OFF button.
▶ Loosen the shutter screw of the pressure head point [B].
▶ Connect the pressure gauge connection "+" to the test
point.
▶ Loosen the shutter screw of the pressure head point [A].
▶ Connect the pressure gauge "-" to the pressure head point
[A].
▶ Press
until the display shows "P1".
▶ Press the button
Display with indication "E".
▶ Press
until the display shows "L1".
▶ Press the button
.
The appliance is in the position for adjustment of the
maximum gas flow.
▶ Open a hot water tap.
▶ Press
or
until the pressure gauge shows the
value indicated in tab. 10.
If it is not possible to reach the value:
▶ Adjust the pressure in the burner
(section 7.3.4) and repeat the adjusting
procedure.
▶ Press
for 3 seconds.
The value flashes as a sign of confirmation.
▶ Press
.
Display with indication "L1".
▶ Close the hot water tap.
▶ Press
until the display shows "E".
6 720 819 528 (2016/02)
+
-
6720804089-11.1V
.
▶ Press the button
Display with indication P1.
The adjustment of the maximum gas flow is finalised.

7.3.3 Adjusting the minimum flow (Parameter P2)

B
▶ Press
until the display shows "P2".
▶ Press the button
Display with indication "E".
▶ Press
▶ Press the button
▶ Open a hot water tap.
The appliance is in the position for adjustment of the
minimum gas flow.
▶ Press
or
value indicated in tab. 10.
If it is not possible to reach the value:
▶ Adjust the pressure in the burner
▶ Press
for 3 seconds.
The value flashes as a sign of confirmation.
▶ Press
.
Display with indication "L2".
▶ Close the hot water tap.
▶ Press
until the display shows "E".
▶ Press the button
Display with indication "P2".
▶ Press simultaneously
Display with indication of temperature selected.
▶ Disconnect the pressure gauges from the pressure heads
points [A] and [B].
▶ Tighten the shutter screws of the pressure heads points [A]
and [B].
The adjustment of the minimum gas flow is finalised.
.
.
until the display shows "L2".
.
until the pressure gauge shows the
(section 7.3.4) and repeat the adjusting
procedure.
.
,
and
for 3 seconds.
Therm 4000 S

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