ZBR...-3A appliances (heating boiler) with DHW tank: Thermal disinfection
Greenstar – 6721822579 (2021/01)
54
8.10
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. 71 Key pad lock
Unlocking the key pad:
▶ Press the key pad lock button until the display shows only the supply
temperature.
9
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.
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.
▶ 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. 72 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.
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.
10
Boiler circulator
10.1
Pump anti-seize protection
This function prevents the heating zone pump from seizing up following
longer idle periods.
The appliance will briefly run the pump at least every 24 hours after its
last activation.
10.2
Changing the pump curve of the boiler pump
The speed of the boiler pump can be changed using the dial on the pump.
Fig. 73 Pump curve of the boiler pump heating boiler ZBR...-3A
max
1
2
3
4
5
6
max
1
2
3
4
e
6
eco
reset
6 720 615 065-17.1O
min
6 720 615 065-10.1O
max
1
2
3
4
5
6
reset
eco
max
1
2
3
4
e
6
0
2
5
7
8
1
4
3
6
15
20
25
10
5
0
H / ft
.
V / gpm
1
2
3
4
400
800
1200
1600
200
600
1000
1400
7
0
6
5
4
3
2
1
0
H / m
.
V / l/h
6 720 641 933-59.1O
1
2
3
4