Bosch KBR42-3A - Setting Frost Protection

Operation
Greenstar FS/Combi FS – 6720810589 (2021/01)
22
4.8 Setting frost protection
Frost protection of the heating system:
▶ Leave the appliance switched ON; turn the boiler high limit dial ( at least t
o
position 1.
eco
reset
max
1
2
3
5
6
max
1
2
3
4
e
6
6 720 641 933-68.1O
min
Fig. 7
For further information, see the operating instructions for the heating control unit
included in the scope of deliv
ery.
Alternatively if you prefer switching the appliance OFF:
▶ Ask a trained and certified heating contractor to mix anti-freeze (see installation
instructions) int
o the heating water. All DHW pipes and DHW tank must be
completely drained.
Frost protection of the DHW tank:
▶ Turn the DHW thermostat e count
erclockwise to min (59 °F (15 °C)).
max
1
2
3
e
6
max
1
2
34
5
6
eco
reset
min
6 720 641 933-69.1O
Fig. 8