Configuration parameter [Buffer] function block
Function [Solar priority]
Optional: only with solar heating systems
This function is used to allow the solar heating system
connected to the buffer to charge the buffer storage
tank (or combination tank) without firing up the boiler.
For this, 2 time slots are set. During the first time slot
(from [Begin solar prio.] to [Change priority at]), the
boiler is "locked". This means that the boiler is not fired
up to charge the buffer, even if the solar heating
system is not delivering enough heat.
During the second time slot (from [Change priority at]
to [End solar prio.]), the boiler can be fired up to charge
the buffer if the solar heating system does not supply
any heat for more than 3 minutes.
If the [Solar priority] function is not needed, it can
be switched off at any time.
Explanation of [Begin solar prio.], [Change priority
at] and [End solar prio.]
Optional: only with solar heating systems
These parameters are used to set the time slots for the
[Solar priority] function.
The first time slot lasts from [Begin solar prio.] to
[Change priority at]. The second time slot begins with
[Change priority at] and ends with [End solar prio.].
Outside the 2 time slots, the boiler can charge the
buffer at any time.
Set the start of solar priority before the first time
window of the heating circuit and hot water tank.
Otherwise, the boiler may start beforehand, in order to
charge the heating circuit or hot water tank.
During the configured times for solar priority, it
may happen that the heating circuits or the hot
water are not supplied with sufficient heat.
Explanation of [Extra solar heat]
Optional: only with solar heating systems
This function defines whether the buffer storage tank
may convey this excess heat from the solar heating
system to other consumers, even if they do not
currently require any heat.
The following conditions must be met in order for
the excess solar heat to be passed on in this way:
• The outside temperature must have exceeded the
configurable value [from outside temp.].
• The [Buffer top] temperature in the buffer must
have exceeded the configurable value of [at buffer
top].
• The [Buffer bottom Solar] temperature in the buffer
must have exceeded the configurable value of [at
buffer bottom sol.].
• In the function block for the hot water tank, heating
circuits or other buffer storage tanks, the [Solar
heat diss.] parameter must be set to [Yes], so that
the buffer can request these consumers to take on
the excess solar heat.
The parameters [from outside temp.], [at buffer top]
and [at buffer bottom sol.] can be configured in the
buffer text menu.
The [Solar heat diss.] parameter can be configured in
the text menu of the hot water tank or the heating
circuit.
Explanation of [Priority]
Optional: only for solar heating systems with
switchover between several tanks
This parameter sets the priority for solar charging of
the buffer. A high priority means that this tank will be
charged by the solar heating system first. A low priority
means that it will be charged last.
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