B07 Run-On Time External Heat Source - Viessmann VITOTRONIC 200 Service Instructions Manual

7B07 Run-on time external heat source

When the demand for the external heat generator is no
longer present, the external heat generator initially
remains on. The external heat generator is only
switched off when the system flow temperature has
reached the set value for the duration set here.
7B0B Max. excess flow temp external heat source
Excess flow temperature of external heat generators
compared to the required set system flow temperature.
A slightly higher flow temperature of the external heat
generator compensates for possible small mixer leaks.
7B0C Enable external heat gen. for central heating
If the heat pump cannot cover the heat demand from
the heating circuits, the external heat generator is star-
ted. If the boiler water temperature is sufficiently high,
the boiler water will be supplied to the heating circuits
via the mixer for external heat generators (downstream
of the buffer cylinder). This mixer regulates to the set
flow temperature of the system.
Other conditions for central heating with an external
heat source:
The dual mode temperature is not reached.
■
Or
■ There is a special heat demand, e.g. frost protection
of a system component.
7B0D Enable external heat source for DHW heating
If the heat pump cannot cover the heat demand from
the DHW cylinder, the circulation pump for DHW
reheating and the external heat generator will be acti-
vated.
Note
If an immersion heater is installed in the DHW cylinder
and is controlled via the heat pump control unit, the
external heat generator cannot be used for DHW
reheating.
Parameter group External heat source
!
Setting in min
!
Note
A negative value reduces the value of "Min. flow tem-
perature mixer external heat source ON 7B05".
≙
Setting 1 0.1 K
!
Value Meaning
"0" External heat source is blocked for central
heating.
"1" External heat source is enabled for central
heating.
!
Value Meaning
"0" External heat generator is blocked for DHW
heating.
"1" External heat generator is enabled for DHW
heating.
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