
132
Internal extensions (accessories)
Internal H1 extension
Fig. 76
The internal extension is integrated into the control unit
enclosure. The following alternative functions can be
connected to relay output
sK
. The function is assigned
via parameter "53" in the
"General"
group:
■
Central fault message (parameter "53:0")
■
DHW circulation pump (parameter "53:1") (only for
weather-compensated operation)
Connect DHW circulation pumps with standalone
functions directly to the 230 V
∼
supply.
■
Heating circuit pump for heating circuit without mixer
(parameter "53:2")
■
Circulation pump for cylinder heating (parameter
"53:3")
An external safety valve can be connected to connec-
tion
gD
.
Function description
Internal extensions
5789 302 GB
Functions
Summary of Contents for B2TB
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