Zwb Appliances - Setting Hot Water Temperature; Summer Mode (Central Heating Off, Dhw Only); Frost Protection - Bosch ZSB 30-2 Installation And Servicing Instructions

8.7 ZWB appliances - setting hot water
temperature
B Set the DHW temperature on the DHW temperature
control .
The set DHW temperature flashes on the display for
30 seconds.
3 4
2 5
1 6
max
Fig. 38
DHW thermostat
min
e
max.
Table 14
eco button
Pressing and holding the eco button until it lights up
switches between Comfort mode and Economy mode.
Comfort mode, (Eco button is not lit - default setting)
The appliance is held constantly at the set temperature.
This means that hot water is available almost
instantaneously at the tap.
Consequently the appliance will switch on at intervals,
even if no hot water is being drawn.
Economy mode, Eco button lit
• The water is not heated up until a hot water tap is
turned on.
• With a demand signal
Briefly turning a hot water tap on and then off signals
demand so that the water is then heated up to the set
temperature.
The demand signal enables gas and water
savings.
Hot water supplied to sanitary fixtures
In accordance with AS 3498 a temperature control
device limited to +50 °C, such as a tempering valve must
be fitted when hot water is supplied to sanitary fixtures
used primarily for the purposes of personal hygiene.
reset
eco
3 4
e
2
1
6
max
6 720 644 143-29.1O
DHW temperature
Approx. 40 °C
Approx. 50 °C
Approx. 60 °C
8.8 Summer mode (central heating off,
DHW only)
B Note position of CH flow temperature control
B Turn CH flow temperature control
as far as the stop .
The heating circuit pump and consequently central
heating are switched OFF. However, the DHW supply
as well as the power supply to the heating
programmer and timer remain 'live'.
3
5
2
1 6
max
Fig. 39
NOTE: Heating system at risk from frost.
Additional instructions are contained in the operating
instructions for the heating programmer.
8.9

Frost protection

Frost protection for the heating system:
B Leave appliance switched on, set CH flow
temperature control
3
5
2
1 6
max
Fig. 40
B Add anti-freeze to the heating water (
drain the DHW circuit.
Additional instructions are contained in the operating
instructions for the heating programmer.
Frost protection for the cylinder:
B Turn DHW temperature controller counter clockwise
as far as it will go (5 °C).
3 4
2 5
1 6
max
Fig. 41
Commissioning | 39
anti-clockwise
reset
eco
3 4
e
2
6
1
min max
6 720 644 143-30.1O
to position 1 at least.
reset
eco
3 4
e
2
6
1
min max
6 720 644 143-31.1O
page 24) and
eco
3
e
2
1 6
min max
6 720 644 143-32.1O
6 720 644 143 (2010/09)
.