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Function description – version with SM1
Version with SM1 and KM-BUS (solar DHW heating)
Reducing the stagnation time
If there is an excess of solar energy, the speed of the
solar circuit pump is reduced before the maximum cyl-
inder temperature is reached (coding address "08").
This causes an increase in the differential between col-
lector temperature and cylinder temperature. The heat
transfer to the DHW cylinder is reduced, which delays
stagnation.
Target temperature control
System with one DHW cylinder
Set code/parameter "10:1" (target temperature control
switched on).
As well as depending on the selected start tempera-
ture differential, the solar circuit pump is only started if
the collector temperature exceeds the value set in cod-
ing address "11".
Monitoring the flow rate
If the solar circuit pump is running, the collector tem-
perature is > 100 °C for longer than 30 min and the dif-
ferential to the cylinder temperature is > 50 K, fault
message "9E" will be issued.
Monitoring of night circulation (not in conjunction with heat pumps)
Code 0D:1.
Unwanted flow rates in the solar circuit (e.g. at night)
are captured. For this, the night-time collector temper-
ature must exceed the outside temperature by 10 K.
The captured situations with unwanted flow are repor-
ted to the control unit of the heat source.
Heat statement (solar yield)
The following factors are taken into consideration
when calculating the heat amount:
■
Differential from collector and cylinder temperature
■
Flow rate
■
Type of heat transfer medium
Runtime of solar circuit pump
■
Interval function
Set code/parameter "07:1".
Activate the interval function in systems where the col-
lector temperature sensor is not in an ideal location, to
prevent a time delay in capturing the collector temper-
ature.
24
(cont.)
The temperature differential for reducing the stagna-
tion time is adjustable in coding address "0A".
This function can only be implemented in systems with
a variable speed solar circuit pump.
System with 2 DHW cylinders
Set code/parameter "10:1" (target temperature control
switched on).
When the temperature of a DHW cylinder has excee-
ded the value set in coding address "11", solar heating
is transferred to the second DHW cylinder.
The situations can be called up under "Diagnosis
solar" (weather-compensated control unit) or "Brief
scan" (constant temperature control unit).
Note
The displayed values cannot be used for billing by the
power supply utility.
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