Dhw Heating; Boosting Dhw Heating; Internal Extensions (Accessories); Internal Extension H1 - Viessmann Vitodens 200-W Series Installation And Service Instructions Manual

Function description
Weather-compensated control unit
The electronic temperature limiter inside the burner
control unit limits the boiler water temperature.

DHW heating

The burner and the circulation pump for cylinder heat-
ing are started if the cylinder temperature lies 2.5 K
below the set cylinder temperature.

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.

Internal extensions (accessories)

Internal extension H1

Fig. 57
The internal extension is integrated into the control unit
casing. The following alternative functions can be con-
nected to relay output
sK
coding address "53" in group "General":
Central fault message (code "53:0")
■
DHW circulation pump (code "53:1") (only for
■
weather-compensated operation)
92
(cont.)
. The function is assigned via
In the delivered condition, the set boiler water temper-
ature is 20 K higher than the set DHW temperature
(adjustable via coding address "60"). The burner will
be switched off and the circulation pump run-on time
will begin, if the actual cylinder temperature exceeds
the set cylinder temperature by 2.5 K.
Heating is boosted during the periods selected in this
time phase.
Heating circuit pump for heating circuit without mixer
■
(code "53:2")
Circulation pump for cylinder heating (code "53:3")
■
An external gas isolation valve can be connected to
connection .
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