B01 Priority Ext. Heat Source/Instant. Heating Water Heater - Viessmann VITOTRONIC 200 Service Instructions Manual

Calling up the parameter group
1. Service menu:
Press OK + simultaneously and hold for
å
approx. 4 s.
2. "Coding level 1"
7B00 Enable external heat source
The external heat source can be activated by the heat
pump control unit if the heat demand requires this.
Note
All other parameters for the external heat source are
only visible if this parameter is set to "1".

7B01 Priority ext. heat source/instant. heating water heater

Only applies to central heating.
7B02 Dual mode temperature external heat source
If the adjusted outside temperature (long term aver-
age) falls below the value set here for an extended
period, the external heat generator will start in line with
demand. Depending on the primary source, either the
adjusted outside temperature (long-term average) or
the temperature in the ice store is decisive for this
("Temperature sensor for dual mode operation
7038").
Requirements:
■ The heat pump and/or other heat sources cannot
meet the current heat demand on their own.
Dual mode parallel operation is set: "Dual mode
■
heat pump operation 7B0E" is set to "1".
Parameter group External heat source
3. "External heat source"
4. Select parameter.
!
Value Meaning
"0" External heat source is not in use.
"1" External heat source, e.g. oil condensing boil-
er, is activated.
Note
This setting simultaneously activates the sys-
tem flow temperature sensor. The parameter
"Common flow temperature sensor sys-
tem 701B" is set to "1".
Value Meaning
"0" Instantaneous heating water heater has prior-
ity.
"1" External heat source has priority.
!
Above the dual mode temperature, the heat pump con-
trol unit only starts the external heat generator under
the following conditions:
■ DHW reheating with the external heat generator is
required ("Enable external heat source for DHW
heating 7B0D").
Heat pump is faulty.
■
■ Heat pump is blocked, e.g. during the power-OFF
periods.
≙
Setting 1 0.1 °C
!
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