Internal extensions
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
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
(cont.)
sK
. The function is assigned
∼
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
when the burner starts.
aBJ
Function description
105