Thermal disinfection (WBN 6000-.. HR only)
25
Gaz 6000 W – 6720866247 (2019/07)
9 Thermal disinfection (WBN 6000-.. HR only)
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
Proper thermal disinfection involves the DHW system including the
discharge points.
CAUTION:
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
▶ Close all DHW draw-off points.
▶ Set any DHW circulation pump to constant operation, if installed.
▶ Activate thermal disinfection via service function 1.2d ( page 27).
▶ Wait until the maximum temperature has been reached.
▶ Open all DHW draw-off points in sequence from the nearest to the
farthest, and draw off DHW until hot water at 70 °C has been flowing
from all draw-off points for 3 minutes.
▶ Restore the original settings.
10 Heating pump
10.1 Changing the heating pump curve
The speed of the heating pump can be changed at the terminal box of the
pump.
▶ To save as much energy as possible and keep flow noises to a
minimum, set a low pump curve.
Fig. 25 Heating pump curve (appliance output < 35 kW)
[1] Pump curve at speed 1
[2] Pump curve at speed 2
[3] Pump curve at speed 3 (default setting)
HResidual head
V Flow rate
Fig. 26 Heating pump curve (appliance output = 35 kW)
[1] Pump curve at speed 1
[2] Pump curve at speed 2
[3] Pump curve at speed 3 (default setting)
HResidual head
V
Flow
ra
te
1
500 1500 1000
0
6
5
4
3
2
1
0
H / m
2
1
0 010 005 980-001
2000 2500
V / l/h
3
500 1500 1000
0
6
7
5
4
3
2
1
0
H / m
2
1
0 010 005 981-001
2000 2500
V / l/h
3
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