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Version with SDIO/SM1A electronics module and...
Minimum collector temperature limit
The solar circuit pump is started when the minimum
collector temperature set in parameter 1126.0 is
exceeded.
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 (parameter 1125.0). This
causes an increase in the differential between collector
temperature and cylinder temperature. The heat trans-
fer to the DHW cylinder is reduced, which delays stag-
nation.
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.
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
■
Determine the heating circuit flow rate and set it in
≙
parameter 950.0. 1 step
Collector frost protection function
Viessmann collectors are filled with Viessmann heat
transfer medium. Consequently, this function does not
need to be enabled.
Only enable it if water is used as the heat transfer
medium.
Auxiliary function for DHW heating
With the auxiliary function for DHW heating (boiler con-
trol unit function), the solar preheating stage can be
heated at the selected times.
Note
This function can only be selected during commission-
ing.
0.1 l/h.
Function description – version with SDIO/SM1A
(cont.)
The temperature differential for reducing the stagna-
tion time can be adjusted in parameter 1505.0.
This function can only be implemented in systems with
a variable speed solar circuit pump.
In the delivered condition, parameter 1136.3 is set to a
value of 1 (operation with Viessmann heat transfer
medium).
Note
The displayed values cannot be used for billing by the
power supply utility.
With a collector temperature below +5 °C, the solar cir-
cuit pump will be started to avoid damage to the collec-
tors. The pump is switched off when +7 °C is reached.
Note parameter 1127.0.
The transfer pump cannot be switched on with these
operating modes of the solar thermal system:
Solar function with central heating backup
■
Solar function with 2nd cylinder preheating
■
■
Solar function with thermostat function
29
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