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Logamatic SC40 - Technical specifications are subject to change without prior notice.
63
Service level menu (for qualified heating engineers only)
7
7.5.19 Daily heating
Menu: Service > Settings > Daily heating
Daily heating is a preventive measure to ensure domestic hot water hygiene.
If the required temperature has not been reached by the heat from the solar system over the past
24 hours, the water in the cylinder is circulated by a pump at the set time. This ensures that the entire
contents of the cylinder are heated by the reheating function.
Afterwards, the pump for the heat exchanger (if present) starts up so as to include that circulation
system as well.
Ensure the following criteria are met in order to guarantee that daily heating functions:
The heat output for daily heating must not be greater than the maximum heat output of the con-
ventional supplementary heating system for the standby cylinder.
The piping for the daily heating system should be better thermally insulated than standard.
The length of the piping runs for daily heating must be kept as short as possible (preheating cyl-
inder located in close proximity of standby cylinder).
The temperature of the standby cylinder must not drop below the 60 °C limit during thermal dis-
infection.
Hot water circulation must be switched off during daily heating of the preheating stage (no return
from circulation to standby cylinder).
If the daily heating function is available on the controller for the standby cylinder (heating system),
the time window for that function must be staggered (e.g. by 30 mins) to start before the time
window of the daily heating function of the preheating cylinder (time window synchronisation).
The hysteresis for the controller must be observed (required hysteresis = 5 K (°C)).
The controller for the standby cylinder must be set so that domestic hot water takes priority.
Daily heating of the preheating stage must be scheduled for times without hot water demand.
Warning: health risk if daily heating function is impaired.
V Check the daily heating function manually with the aid of a thermometer when com-
missioning the system.
Setting range Default setting New setting
Yes/No No
Tab. 32
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Others manual(s) of Buderus Logamatic SC40

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