Bedienungsanleitung Viessmann VITOTRONIC 200 (Seite 96 von 112) (Englisch)

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Vitovent 200-W, Vitovent 300-C and Vitovent 300-W:

■It is warmer inside than outside.

■The room temperature is higher than the "Set room

temperature" for ventilation.

■The outdoor air is warmer than 7 °C.

Passive heating

Warmer outdoor air is supplied to the rooms on warm

spring days, for example.

The bypass is active for passive heating if all of the fol-

lowing conditions are met:

Vitovent 200-C and Vitovent 300-F:

■The outdoor air is at least 4 °C warmer than the

room temperature.

■The room temperature is at least 1 °C cooler than

the "Set room temperature" for ventilation.

Note

With the Vitovent 200-W, Vitovent 300-C and

Vitovent 300-W, passive heating is not possible.

Air flow rates

In order to prevent any negative or positive pressures

developing in your rooms, the flow rate of the supply

air must exactly match the flow rate of the extract air.

Your contractor regulates these air flow rates during

commissioning.

Regulating the humidity and carbon dioxide con-

centration (CO2 concentration)

■If a CO2/humidity sensor (accessories) is installed in

one of your rooms, the ventilation unit can adjust the

air flow rate subject to the humidity and/or carbon

dioxide concentration (CO2) of this room.

■If a humidity sensor (accessories) is installed in the

central extract air duct, the ventilation unit can adjust

the air flow rate subject to the humidity of all rooms.

The humidity and carbon dioxide concentration can

only be controlled in the "Ventilation program".

Frost protection for the heat exchanger in the ven-

tilation unit

Heat recovery transfers heat from the extract air to the

incoming outdoor air. This causes the extract air to

cool down, which in turn leads to condensate forming

in the heat exchanger. At low outside temperatures,

condensate can freeze on the heat exchanger. Heat

recovery is reduced. The worst-case scenario is that

the ice damages the heat exchanger.

■Frost protection with electric preheating coil:

To prevent ice forming on the heat exchanger, the

outdoor air can be preheated by an electric preheat-

ing coil before it enters the heat exchanger. Some

ventilation units have an electric preheating coil pre-

fitted at the factory. For other units, your contractor

will install an electric preheating coil in the outdoor

air duct.

■Frost protection without electric preheating coil:

If your ventilation unit does not have an electric pre-

heating coil, the air flow rate will be reduced in order

to protect the heat exchanger, if necessary until the

fans come to a standstill.

■Defrost functions: Only with Vitovent 200-C

Your contractor can set various functions to defrost

any ice that may have formed on the heat

exchanger: e.g. the outdoor air flow rate can bypass

the heat exchanger and/or the supply air flow rate

can be reduced. In addition, the electric preheating

coil (accessories) can be switched on.

Note

With frost protection, the indicated ventilation level

may deviate from the ventilation level selected. The

ventilation level displayed is adjusted to reflect the

reduced air flow rate brought about by the frost protec-

tion function.

Only with Vitovent 300-F: supply air heating via

heating circuit 1 (ventilation heating circuit)

If a hydraulic reheating coil (accessories) has been

installed in your ventilation unit, the supply air can be

heated by the heat pump. The outdoor air/supply air

preheated in the heat exchanger of the ventilation unit

is reheated via the hydraulic reheating coil of the heat

pump.

In such a case, set the room temperature and time

program for central heating via the menu for heating

circuit 1.

Note

The level of heating output that can be transmitted via

the ventilation heating circuit is only minimal. Using

supply air heating as the sole heat source is therefore

only recommended for highly insulated buildings (e.g.

passive houses).

Cooling mode

See "Heating mode/cooling mode".

Appendix

Terminology (cont.)

5817913

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