105
Internal H2 extension
Fig. 67
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/coding address "53" in the
"General"
group:
■
Central fault message (parameter/code "53:0")
■
DHW circulation pump (parameter/code "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/code "53:2")
■
Circulation pump for cylinder heating (parameter/
code "53:3")
An extractor fan can be switched off via connection
aBJ
when the burner starts.
Function description
Internal extensions
(cont.)
5778741
Functions