CDA HCE340 for Manual de Serviço descarregar pdf (Página 12)

VEX340: Control system

Frost protection

Highly ef cient counter  ow heat exchangers can be prone to

icing as the air extracted from a room can contain moisture.

When the energy from this extracted air is used (when the air

cools), the moisture condenses to water vapour, which collects

in the heat exchanger.

The high ef ciency means that some areas inside the heat

exchanger become very cold, and in these areas water will

freeze and form ice. This can block the air ow. To counteract

this a new control principle has been developed, which

ensures optimal operation.

To ensure EXHAUSTO counter  ow heat exchangers can

operate in areas that have low outdoor temperatures

EXHAUSTO has developed a unique extract air system.

When ice begins to form inside the counter  ow heat exchanger,

the VEX340H control system circulates up to 30 % of the

warmed supply air back into the cold outdoor air. This raises

the temperature, and helps to prevent icing.

To the right side we have the return air principles and below

we have the different frost protection methods.

Innovative ice detection and control

Is an imbalance

acceptable?

Yes No

METHOD 3METHOD 1 METHOD 2

Return air is activated and

gradually increased to 30 %

Air ows (supply air and extract air)

are reduced if necessary to achieve

30 % return air

The outdoor air is gradually

reduced

The unit enters hibernation mode

The unit starts every two hours

and monitors the situation

Return air is activated and gradu-

ally increased to 30 % – if possible

The outdoor air is gradually

reduced

The unit enters hibernation mode

The unit starts every two hours and

monitors the situation

Return air is activated and

gradually increased to 30 %

Air ows (supply air and extract air)

are reduced if necessary to achieve

30 % return air

The unit enters hibernation mode

The unit starts every two hours

and monitors the situation

Is reduced extraction

during de-icing

acceptable?

Air  ow control

2. Constant air ow

Constant pressure regulation of extract air

3. Constant pressureregulated extract air with  xed supply air setting

5. Constant pressureregulated extract air with slave-controlled supply air

Constant pressure regulation of supply air

4. Constant pressureregulated supply air with  xed extract air setting

6. Constant pressure regulated supply air with slavecontrolled extract air

Constant pressure regulation of both extract air and supply air

7. Constant pressure regulation of both extract air and supply air

Air regulation - Six different methods of regulation can be selected:

NB! This function is only active for airﬂ ow control methods 2 and 5 See below for details.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 23 24

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