113
DHW heating via solar collectors
If the temperature differential measured between the
collector temperature sensor and the cylinder tempera-
ture sensor of the solar control module is greater than
the start temperature differential set in the control unit,
the solar circuit pump is started and the DHW cylinder
is heated.
The pump is stopped when the temperature falls below
the stop temperature differential between the collector
temperature sensor and the cylinder temperature sen-
sor of the solar control module.
The solar circuit pump is also stopped if the set maxi-
mum temperature or the temperature set at the tem-
perature limiter is reached.
Boosting DHW heating
This function is activated by specifying a second set
DHW temperature via coding address 58 in group
"DHW"
and activating the fourth DHW phase for DHW
heating.
Heating is boosted during the periods selected in this
time phase.
Internal extensions (accessories)
Internal extension H1
Fig. 83
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 coding address "53" in group
"General"
:
■
Central fault message (code "53:0")
■
DHW circulation pump (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
(code "53:2")
■
Circulation pump for cylinder heating (code "53:3")
An external safety valve can be connected to connec-
tion
gD
.
Function description
Control unit
(cont.)
5773 238 GB
Functions
