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Adjusting Pressure In The Burner (Parameter P0); Factory Default Settings; Changing The Type Of Gas; Maintenance (Only By Qualified Contractors) - Bosch Therm 4000 S Installation And Operating Manual

Gas instantaneous water heaters
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Ø injector
Dynamic connection
pressure (mbar)
Burner pressure (psi) -
P0
Differential pressure
of the burner MAX
(psi) - P1
Differential pressure
of the burner MIN
(psi) - P2
Table 10 Pressure of the burner

7.3.4 Adjusting pressure in the burner (Parameter P0)

Burner pressure adjustment is only required
if "L1" and "L2" cannot be reached.
▶ Enter the Service function (section 7.2).
Display with indication "P2".
▶ Press
until the display shows "P0".
▶ Press the button
.
▶ Open a hot water tap.
Let the value measured in the pressure gauge stabilise.
▶ Press
or
until the pressure gauge shows the
value indicated in tab. 10.
▶ Press
for 3 seconds.
The value flashes as a sign of confirmation.
▶ Press
to come out of this function.
Display with indication P0.
▶ Close the hot water tap.
The adjustment of the burner pressure is finalised.
7.4

Factory default settings

▶ Enter the Service function (section 7.2).
Display with indication "P2".
▶ Press
until the display shows "P4".
▶ Press the button
.
Display with indication "E".
Therm 4000 S
Nat. gas
LP gas
GWH12
GWH15
1.7
GWH18
GWH12
GWH15
2
GWH18
GWH12
GWH15
1.2
GWH18
GWH12 0.48 - 0.52 0.46 - 0.5
GWH15 0.51 - 0.55 0.48 - 0.52
GWH18 0.41 - 0.45 0.41 - 0.45
GWH12 0.06 - 0.08 0.06 - 0.08
GWH15 0.07 - 0.09 0.07 - 0.09
GWH18 0.08 - 0.1 0.07 - 0.09

Maintenance (only by qualified contractors) | 19

▶ Press
▶ Press the button
Display with indication "P1".
1.3
▶ Press
The value flashes as a sign of confirmation.
▶ Press
Display with indication "P1".
2.8
▶ Press
▶ Press
The value flashes as a sign of confirmation.
▶ Press
Factory default settings are restored.
7.5

Changing the type of gas

Only use original conversion kits. The conversion must only be
done by a qualified contractor. The original conversion kits are
supplied with fitting instructions.
8
Maintenance (only by qualified
contractors)
To guarantee that the consumption of gas and the emission of
gas are maintained at the best values, we recommend that the
appliance be inspected every year and if necessary,
maintenance works be carried out.
▶ Your appliance should only be attended to by a Bosch
Technical Assistance Centre.
▶ Only use original replacement parts.
▶ Order the replacement parts as per the list of appliance
replacement parts.
▶ Replace the joints and o-rings removed with new ones.
▶ Only the following lubricating greases may be used:
– In the hydraulic connections: Unisilikon L 641 (8 700
918 024 0).
– Threaded connections for gas: HFt 1 v 5 (8 709 918
010).
until the display shows "rP"
.
for 3 seconds.
.
until the display shows "P2".
for 3 seconds.
.
Maintenance must only be done by a
qualified contractor.
DANGER: By electrical discharge.
▶ Always isolate the electrical power in the
appliance (fuse, safety power switch)
before carrying out any work on
electrical parts.
6 720 819 528 (2016/02)

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Gwh12Gwh15Gwh18