installation manual

50 | ZBR..-3A appliances (heating boiler) with DHW tank: Thermal disinfection
Greenstar6 720 806 992 (2013/07)
▶ 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.
7.9 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. 25, page 48).
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. 14,
page 28) 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. 25, page 48).
▶ Turn the DHW thermostat counterclockwise to min
(59 °F (15 °C)).
Fig. 63 Frost protection for the DHW tank
7.10 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.
Fig. 64 Key pad lock
Unlocking the key pad:
▶ Press the key pad lock button until the display shows only the supply
temperature.
8 ZBR..-3A appliances (heating boiler) with
DHW tank: Thermal disinfection
Thermal disinfection covers the DHW system including the taps. For
solar DHW tanks, the solar portion of the tank is not covered.
▶ Close all DHW taps.
▶ Advise occupants of the risk of scalding if no tempering valve is
installed.
▶ Set the time and DHW temperature accordingly on the heating control
with DHW program.
▶ Set any DHW recirculation pump to continuous operation.
▶ Turn DHW thermostat clockwise to max (approx. 158 °F (70 °C)).
Fig. 65 Thermal disinfection
▶ Wait until the maximum temperature has been reached.
▶ Open all DHW taps, from the nearest to the one furthest away, and
draw off hot water until it reaches a minimum of 158 °F (70 °C) at all
taps for at least 3 minutes.
▶ Reset the DHW thermostat, DHW recirculation pump, and heating
control to standard operation.
For further information, see the operating instructions
for the heating control included in the scope of delivery.
6 720 615 065-13.1O
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WARNING: Risk of scalding!
Hot water can result in severe scalding.
▶ Carry out thermal disinfection only outside the normal
hours of use, or install a tempering valve.
Thermal disinfection can also be carried out
automatically and on a regular basis; see operating
instructions for the heating control included in the scope
of delivery.
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