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[External heat demand] function block ETAtouch controller
6.9 [External heat demand] function
block
External heat demand overview
With this function block, an external control system can
demand heat from the ETA heating system.
1 Operating condition and information.
A description of the operating conditions can be
found in the integrated Help menu by pressing the
button.
2 Temperature request (by external control) to the
ETA heating system.
3 A switching contact to display the demand for heat
from the external heat consumer
4 Heat consumer on/off switch
= switched on
= switched off
Heat demand
This switch symbol indicates whether the
heat consumer is currently demanding heat
from the heating system. If the switch is open
( ), there is currently no demand. If it is closed
( ), heat is being demanded from the ETA heating
system.
External heat demand function
If the heat consumer is turned on ( ), heat is
supplied on the basis of the set time windows.
In the settings menu ( button), time windows and
temperatures for the heat consumers are shown. See
chapter 6.9.1 "
Setting the charging times".
Within the time slots, the external heat consumer can
demand heat from the buffer. If the buffer is colder than
the temperature demanded by the heat consumer, the
ETA boiler is activated.
The pump for charging the external heat
consumer only starts when the temperature
available from the heating system is higher than the
adjustable enable temperature [Enable temperature];
see 6.9.2.1 "
Enable temperature".
If the external heat consumer is connected to the
[GM-C2] circuit board, the output or temperature
required by the heat consumer can be communicated
to the ETA control system via an analogue signal (0-10
V or 4-20 mA).
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