Operating instructions

Commissioning | 39
6 720 644 143 (2010/09)
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.
Fig. 38
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.
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.
8.8 Summer mode (central heating off,
DHW only)
B Note position of CH flow temperature control .
B Turn CH flow temperature control anti-clockwise
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'.
Fig. 39
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 to position 1 at least.
Fig. 40
B Add anti-freeze to the heating water (Æ page 24) and
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).
Fig. 41
DHW thermostat DHW temperature
min Approx. 40 °C
eApprox. 50°C
max. Approx. 60 °C
Table 14
The demand signal enables gas and water
savings.
eco
reset
max
1
2
3
4
e
6
6 720 644 143-29.1O
max
1
2
34
5
6
NOTE: Heating system at risk from frost.
6 720 644 143-30.1O
eco
reset
max
1
2
3
5
6
max
1
2
3
4
e
6
min
eco
reset
max
1
2
3
5
6
max
1
2
3
4
e
6
6 720 644 143-31.1O
min
max
1
2
3
e
6
max
1
2
34
5
6
eco
6 720 644 143-32.1O
min