Zbr; Zwb; Setting The Dhw Temperature; Setting Manual Summer Mode - Bosch ZBR16-3A Series Installation And Service Instructions Manual

8.7 ZBR..-3A appliances (heating boilers) with DHW tank:

Setting the DHW temperature

▶ Set the DHW temperature on the DHW thermostat
The set DHW temperature flashes on the display for 30 seconds.
3 4
2 5
1 6
max
Fig. 65 Set the DHW temperature (heating boiler ZBR..-3A)
DHW thermostat Typical DHW temperatures
min approx. 59 °F (15 °C)
e approx. 131 °F (55 °C)
max approx. 158 °F (70 °C)
Table 26 Typical DHW temperatures for heating boiler
ZBR..-3A
WARNING: Danger of scalding!
▶ In normal operation, it is recommended to limit the
DHW temperature to 122 °F (50 °C) to limit the risk of
scalding.
▶ Install a tempering valve if running DHW temperatures
above 104 °F (40 °C).
▶ Only use temperatures up to 158 °F (70 °C) for
thermal disinfection ( page 56).
If there is reason for concern for contamination from
bacteria such as legionella, consider setting the DHW
thermostat to at least "e" (131 °F (55 °C)).
This setting ensures an economical and comfortable
DHW generation. Consult your local water department or
municipality for further information.
ECO button
The default setting is DHW priority; the ECO button is not lit.
In order to switch between DHW tank priority and alternating
operation, press the ECO button.
• DHW priority
First, the DHW tank is heated up to the set temperature. The
appliance then goes into heating mode. Therefore, it can happen that
space heating is interrupted for a while and the room temperature
may drop.
DHW tank priority guarantees highest DHW comfort.
• Alternating operation
The appliance switches between space heating mode and DHW mode.
This prevents the room from cooling off too much.
Alternating operation guarantees an even room temperature with
somewhat less DHW convenience.
Greenstar
.
reset
eco
4
3
2 e
1
6
max
6 720 641 933-54.1O
8.8 ZWB..-3A appliances (combi boilers):
Setting the DHW temperature
▶ Set the DHW temperature on the DHW thermostat
The set DHW temperature flashes on the display for 30 seconds.
3 4
2 5
1 6
max
Fig. 66 Set the DHW temperature (combi boiler ZWB..-3A)
DHW thermostat Typical DHW temperatures
min approx. 104 °F (40 °C)
e approx. 122 °F (50 °C)
max approx. 140 °F (60 °C)
Table 27 Typical DHW temperatures for combi boiler
ZWB..-3A
ECO button
Pressing and holding the ECO button until it lights up switches between
Comfort mode and Economy mode.
• Comfort mode (default setting)
The appliance is continually maintained at the set temperature.
Consequently, DHW draws are immediate, however the appliance
may run even if no DHW is being drawn.
• Economy mode, ECO button lights up
– DHW is only generated when DHW is drawn.
– On demand: Quickly open and close a DHW tap to signal the
appliance to heat to the selected temperature. After a short wait
DHW will be available.
The DHW on demand signal allows maximum gas and
water savings.
8.9

Setting manual summer mode

In summer mode or warm weather shut down (WWSD), the heating zone
pump and consequently central heating are switched off. DHW
generation remains active following the DHW program.
See also the warm weather shutdown (WWSD) feature in
the operating instructions for the heating control
included in the scope of delivery.
NOTICE: Heating system at risk of freezing. In manual
summer mode, only the appliance is protected from
freezing.
▶ Observe frost protection measures where there is a
risk of frost ( Chapter 8.10).
▶ Make a note of the setting of the boiler high limit dial
Commissioning | 55
.
reset
eco
4
3
e
2
1
6
max
6 720 641 933-55.1O
.
6 720 806 992 (2015/03)