Vaillant sensoCOMFORT VRC 720/3 Operating And Installation Instruction Download

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0020334316_02 Operating and installation instructions

Ext. cooling mode

The signal of an external control is used to switch between heating
and cooling.

–

MI contact closed = cooling

–

MI contact open = heating

Heat generator 1

Status:

Display of the current control command at the heat generator

Current flow temperature: °C

Display of the current heat generator flow temperature

Heat pump 1

Status:

Display of the current control command at the heat pump

Current flow temperature: °C

Display of the current heat pump flow temperature

HP control module

Status:

Display of the current control command at the back-up boiler that
is connected to the heat pump appliance interface.

Current flow temperature: °C

Display of the current flow temperature of the back-up boiler that is
connected to the heat pump appliance interface.

Circuit

Circuit type:

Value setting:

Heating

Inactive

The heating circuit is not being used.

Heating

The heating circuit is being used to heat and is weather-com-
pensated. Depending on the basic system diagram, the heating
circuit may be a mixing circuit or a direct circuit.

Fixed value

The heating circuit is used for heating and is maintained at a fixed
target flow temperature.

DHW

The heating circuit is being used as a domestic hot water circuit for
an additional cylinder.

Increase in return

The heating circuit is used for the increase in return. The increase
in return prevents an excessive temperature difference between
the heating flow and return, and protects against corrosion in the
floor-standing boiler when the dew point is not reached for an ex-
tended period.

Status:

Display of the current operating mode

Target flow temperature: °C

Target value for the heating circuit flow temperature

Actual flow temperature: °C

Display of the current heating circuit flow temperature

Target return temperature: °C

Select a temperature at which the heating water should flow back
into the floor-standing boiler.
Factory setting: 30 °C

OT switch-off threshold: °C

Enter the upper limit for the outdoor temperature. If the outdoor
temperature rises above the set value, the system control deactiv-
ates heating mode.
Factory setting:

–

21 °C for a conventional heat generator

–

16 °C for a heat pump

Target flow temp., desired: °C

Select the temperature for the fixed value circuit which applies
within the time period.
Factory setting: 65 °C

Target flow temp., set-back: °C

Select the temperature for the fixed value circuit which applies
outside of the time period.
Factory setting: 0 °C

Heat curve:

The heat curve is the dependence of the flow temperature on the
outdoor temperature for the desired temperature (target room tem-
perature). Detailed description of the heat curve (

→

Section 2.12)

Factory setting:

–

1.20 for a conventional heat generator

–

0.60 for a heat pump and/or mixed circuit

Min. target flow temperature:°C

Enter the lower limit for the target flow temperature. The system
control compares the set value with the calculated target flow tem-
perature, and regulates to the larger of these values.
Factory setting: 15 °C