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SOL16 / P16
Maximum cylinder
temperature,
solar cylinder 2
SOL17 / P17
Assigning solar cylinder 2
SOL18 / P18
Burner blocking in case of
return temperature raising
SOL19 / P19
Start differential, return
temperature raising
SOL20 / P20
Stop differential
Return temperature raising
SOL21 / P21
Cylinder with priority
3062438_0309
Parameter description
In systems with two cylinders, the maximum temperature for solar
cylinder 2 is selected here.
The function is similar to that of parameter SOL06 / P06 (maximum
cylinder temperature solar cylinder 1):
The water inside solar cylinder 2 is heated up to the maximum
cylinder temperature. Cylinder heating is terminated, if
Cylinder temperature solar cylinder 2 > Maximum cylinder
temperature solar cylinder 2
For a description, see parameter SOL07 / P07
(assignment, solar cylinder 1)
For raising the return temperature during central heating backup,
a three-way diverter valve is controlled to raise the heating return
temperature via a buffer cylinder that has previously been heated
up.
When the SM2 is operated as part of the Wolf control system WRS,
the boilers are blocked when the start conditions have been met.
If a demand is issued by at least one heating circuit or one
DHW cylinder, the three-way diverter valve will be switched, and
the blocking time set in parameter SOL 18 (= blocking time for
burner blocking) starts. The burner will be enabled again after
the blocking time has expired. The burner will be disabled for the
set time when the start condition has been met whilst the burner
is already enabled.
When setting a blocking time of 0 s, the three-way diverter valve
will be switched independent of a heat demand.
This parameter is only relevant to systems with return temperature
raising for central heating backup (system configuration SOL12 /
P12 = 2).
Here, the central heating return is raised via a buffer cylinder that
is heated by the solar thermal system. If the condition
Buffer temperature > Return temperature + Start differential, return
temperature raising has been met, then the three-way diverter
valve is switched.
This parameter is only relevant to systems with return temperature
raising for central heating backup (system configuration SOL12 /
P12 = 2).
Return temperature raising is terminated, if
Buffer temperature < Return temperature + Stop differential, return
temperature raising
In systems with two solar cylinders, one cylinder is defined as
having priority, the other as lower ranking cylinder.
The assignment as cylinder with priority is determined in parameter
21.
SOL21 / P21 = 0 → Cylinder with priority = cylinder 1
(factory setting)
SOL21 / P21 = 1 → Cylinder with priority = cylinder 2
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