ZBR..-3A appliances (heating boiler) with DHW tank: Thermal disinfection
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63
6 720 643 068 (2011/06)
Copyright (optional information)
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:
B
Press the key pad lock button until
and the heating
supply temperature are alternating on the display.
Fig. 62 Key pad lock
Unlocking the key pad:
B
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.
B
Close all DHW taps.
B
Advise occupants of the risk of scalding if no tempering
valve is installed.
B
Set the time and DHW temperature accordingly on the
heating control with DHW program.
B
Set any DHW recirculation pump to continuous
operation.
B
Turn DHW thermostat clockwise to
max
(approx. 158 °F
(70 °C)).
Fig. 63 Thermal disinfection
B
Wait until the maximum temperature has been reached.
B
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.
B
Reset the DHW thermostat, DHW recirculation pump,
and heating control to standard operation.
max
1
2
3
4
5
6
max
1
2
3
4
e
6
eco
reset
6 720 615 065-17.1O
min
WARNING:
Risk of scalding!
Hot water can result in severe scalding.
B
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.
6 720 615 065-10.1O
max
1
2
3
4
5
6
reset
eco
max
1
2
3
4
e
6
