eta T2-BT Configuration

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[BufferFlex] function block Configuration parameter
Explanation of [Buffer max]
This configurable shutdown temperature sets a
threshold for how much the buffer can be charged by
the solar heating system, to prevent the buffer from
overheating. If the allocated temperature sensor
reaches the configured shutdown temperature, the
solar pump of the solar heating system is switched off.
Explanation of [Priority]
Optional: only with solar heating system and buffer
with 2 internal coils
This parameter sets the priority of the top and bottom
sections of the buffer for solar charging. A high priority
means that this section will be charged by the solar
heating system first. A low priority means that it will be
charged last.
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 15 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]
This parameter indicates whether the buffer is transfer-
ring the excess heat from the solar heating system to
the consumers, even if they currently do not need heat.
With the [No] display, the buffer will not transfer any
excess solar heat. If [Yes] is displayed, excess so-
lar heat is forwarded.
The following conditions must be met in order for
the excess solar heat to be passed on in this way:
• The current outside temperature must be higher
than the adjustable value [from outside temp.].
• 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].
• The following temperatures must be exceeded in
the buffer:
–If the [Buffer] function block is configured, the
[Buffer top] temperature must be above the
configurable value [at buffer top] and the
[Buffer bottom Solar] temperature above the
value [at buffer bottom sol.].
–If the function block [BufferFlex] is
configured, the temperature [from accumulator
tank temperature] at the allocated tempera-
ture sensor must be exceeded.

eta T2-BT Specifications

General

Brand	eta
Model	T2-BT
Category	Control Panel
Language	English