Install Instructions

Commissioning | 53
6 720 810 590 (2015/05)
Greenstar FS
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.
8.8 KWB..-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.
Fig. 60 Set the DHW temperature (combi boiler KWB..-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.
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.
▶ Make a note of the setting of the boiler high limit dial .
▶ Turn the boiler high limit dial counterclockwise to .
Fig. 61 Summer mode
For further information, see the operating instructions for the heating
control included in the scope of delivery.
8.10 Setting frost protection
Frost protection of the heating system:
▶ Leave the appliance switched ON; set the boiler high limit to at least
95 °F (35 °C) (position 1,  Tab. 16, page 50).
Fig. 62 Frost protection of the heating system
-or- If you want to leave the appliance switched OFF:
▶ Mix Bosch-approved anti-freeze into the heating water ( Tab. 5,
page 31) and drain the DHW circuit.
Frost protection of the DHW tank:
▶ Leave the appliance switched ON; set the boiler high limit to at least
95 °F (35 °C) (position 1,  Tab. 16, page 50).
▶ Turn the DHW thermostat counterclockwise to min
(59 °F (15 °C)).
Fig. 63 Frost protection for the DHW tank
8.11 Activating the key pad lock
The key pad lock affects the boiler high limit dial, the DHW thermostat,
and all buttons except the ON/OFF switch, emissions test button, and
reset button. It can be used to limit unauthorized access to the boiler.
Activating the key pad lock:
▶ Press the key pad lock button until and the heating supply
temperature are alternating on the display.
DHW thermostat Typical DHW temperatures
min approx. 104 °F (40 °C)
e approx. 122 °F (50 °C)
max approx. 140 °F (60 °C)
Table 18 Typical DHW temperatures for combi boiler KWB..-3A
The DHW on demand signal allows maximum gas and
water savings.
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).
6 720 641 933-55.1O
max
1
2
34
5
6
reset
eco
max
1
2
3
4
e
6
For further information, see the operating instructions
for the heating control included in the scope of delivery.
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
6 720 641 933-68.1O
min
max
1
2
3
e
6
max
1
2
34
5
6
eco
reset
min
6 720 641 933-69.1O