19
When a heat demand occurs, the heat pump is started
by a higher control unit, via the
X3.12/X3.13
contact on
the cross connect PCB (floating contact required): See
page 71.
The heat pump control unit transmits the parameters
and measured values for heat pump operation to the
higher control unit via Modbus.
When
"External control"
is active, the compressor
always runs at maximum output. The set flow tempera-
ture is permanently set to 50 °C.
Note
Although neither the primary nor secondary pump are
directly connected to the heat pump control unit, the
designated outputs for some functions will nonetheless
be triggered. The corresponding pump symbols will
thus sometimes be displayed.
Function description
External control
5800 917 GB
Functions
