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Commissioning Of The Appliance; Changing The Setpoint Limit Temperature (Only For 55 °C Preset Appliances); 4.11 Delivery Temperature Calibration - Bosch Optiflow GWH16 3 CT E23 F6 L S2405 Installation Manual

Gas continuous flow water heaters
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14 | Installation (only by authorised technicians)
If the power cable is damaged, it must be
replaced with a Bosch supplied spare part.
▶ Connect the power cable to a power socket.
4.9

Commissioning of the appliance

▶ Open the gas and water isolation valves and check the
tightness of all the connections.
If a controller is connected:
▶ Turn the appliance on using the ON/OFF button.
The appliance is now ready to operate.
When a hot water tap is turned on, the movement of water
through the flow sensor (fig. 2, [5]) sends a signal to the
electronic control unit. This signal triggers the following
actions:
The fan to start working.
The ignition sequence and the gas valve (fig. 2, [13])
delivers gas to the burner.
The burner ignites. Initially only one section of the burner is
lit, with remain sections igniting depending on the heat
required.
The flame sensor rod (fig. 2, [2]) detects the presence of
the flame.
The temperature of the water is automatically adjusted by
the fan, gas and water valves.
Safety shut-off when the safety time is exceeded
If the appliance does not maintain a flame within the safety
interval stipulated, a safety shut-off is carried out.
The presence of air in the gas supply line (initial start-up of the
appliance or start-up after long periods of inactivity) may cause
a delay or difficulty when igniting.
If the ignition attempt is unsuccessful after a period of time, the
safety devices block the operation of the appliance, and air will
have to be purged from the circuit.
Safety shut-off due to an excessively high water
temperature
The electronic control unit detects the temperature of the
water through the thermistor placed at the hot water outlet. If
the appliance detects an excessive temperature, a safety shut-
off will occur.
Safety shut-off due to incorrect flue conditions
If the appliance detects an incorrect flue condition, a safety
shut-off will occur.
Re-start after a safety shut-off
To put the appliance back into operation after a safety shut-off:
6 720 817 545 (2016/02)
▶ Close all hot water taps.
▶ Reset the appliance by switching it off at the socket and
unplugging the cord.
4.10 Changing the setpoint limit temperature
(only for 55 °C preset appliances)
The maximum temperature is preset to 55 °C. If required it can
be increased to 60 °C or 70 °C.
▶ Enter the Service function (section 5.2).
Display will show "P2".
▶ Press
until the display shows "P4".
▶ Press the button
.
Display will show "E".
▶ Press
until the display shows "SL".
▶ Press the button
.
Display will show "55"
▶ Press
until the display shows "60" or "70".
▶ Press the button
The value flashes to confirm the new setpoint limit.

4.11 Delivery temperature calibration

If the delivery temperature at the closest hot water outlet to the
appliance does not match the setpoint it can be adjusted as
follows:
▶ Enter the Service function (section 5.2).
Display will show "P2".
▶ Press
until the display shows "P4".
▶ Press the button
.
Display will show "E".
▶ Press
until the display shows "SC".
▶ Press the button
.
Display will show "0"
▶ Press
or
to adjust the delivery temperature as
required.
The setpoint can be adjusted between -2.5 °C and +2.5 °C.
Display
-5
-4
-
-
0
-
-
4
5
Table 8
▶ Press the button
The value flashes to confirm the adjustment has been
made.
for 3 seconds.
Setpoint calibration
-2.5 °C
-2.0 °C
-
-
0 °C
-
-
2.0 °C
2.5 °C
for 3 seconds.
Optiflow

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