CommPact Control system Manual de usuario descargar pdf (Pagina 5)

COMPACT

COMPACT Control System

Applies to COMPACT Unit & Top only

Supply Air Regulation (control)

Supply air regulation involves keeping a constant supply air tem-

perature without consideration to the load in the premises.

Supply air regulation can be used when the load and tempera-

tures of the premises are predictable. In most cases this requires

the installation of an air heater for reheating, possibly an air

cooler as well.

Control Sequence

The temperature efﬁciency of the air handling unit’s heat ex-

changer is modulated to provide max. heat recovery.

After that, the air heater for reheating, if installed, will begin to

supply heat.

If an air heater for reheating the supply air is not installed, or

if the heating power in the air heater for reheating is not suf-

ﬁcient either, the supply air fan or both the supply air and the

exhaust air fans will automatically and variably be decelerated to

discharge supply air at the min. airﬂow setpoint.

A neutral zone can be preset, which allows a lower supply air

temperature setpoint before the downspeed fan control func-

tion begins.

When the supply airﬂow is regulated to a lower rate, the heat

exchanger will have ”excess heat”, i.e. warm extract air, giving

it capacity to attain and maintain the supply air temperature

required.

As the supply airﬂow is controlled to a lower rate, the air pres-

sure in the premise becomes sub-atmospheric and this instead

causes outdoor air to be sucked in through untight spots (leak-

age points) such as doors and windows. The ordinary heating

system of the premises must be sized for heating this outdoor

air.

Extract Air Regulation

Extract air control involves keeping a constant temperature in

the extract air duct (the premises), by regulating the supply air

temperature.

The lowest and the highest permissible supply air temperatures

are speciﬁed while the COMPACT keeps the extract air temper-

ature constant.

The result will be a uniform temperature in the premises re-

gardless of the load. Extract air regulation requires the installa-

tion of an air heater for reheating, possibly an air cooler as well.

The extract air temperature is measured by the temperature

sensor inside the COMPACT unit. If this internal temperature

sensor does not give adequate representative extract air tem-

perature readings, an external room temperature sensor can be

installed and can be wired to terminals on the control unit.

Control Sequence

The temperature efﬁciency of the air handling unit’s heat ex-

changer is modulated to provide max. heat recovery.

After that, the air heater for reheating, if installed, will begin to

generate heat.

Applies to COMPACT Unit & Top only

Outdoor Compensation

Temperature

Outdoor compensation can be activated if the premises are af-

fected to an unusually high degree by cold and heat, via large

windows, for instance.

If the function is selected, the temperature setpoint is displaced

relative to the outdoor temperature according to a summer

curve or a winter curve. It is possible to set the slope of the

curves and their starting and end points. In conjunction with

supply air or extract air control only.

See the Outdoor Compensation Diagram below.

Negative summer compensation is also possible to preset.

X = Outdoor air temperature °C

Y = Temperature displacement °C

Winter compensation according to the factory settings involves the fol-

lowing:

Outdoor temperature of +10 °C (Breakpoint X2): Compensation starts

and gradually proceeds between 0-3 °C down to an outdoor air tem-

perature of -20 °C.

Outdoor air temperature -20 °C (Breakpoint X1): Constant compensa-

tion takes place with 3 °C (temperature displacement Y1).

Summer compensation in accordance with factory settings involves the

following:

Outdoor temperature +25 °C (Breakpoint X3): Compensation starts

and gradually proceeds between 0–2 °C up to an outdoor temperature

of +40 °C.

Outdoor temperature +40 °C (Breakpoint X4): Constant compensation

takes place with 2 °C (temperature displacement Y2).

X2 X3

Outdoor compensation

Temperature regulation

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COMPACT Control System 1

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CommPact Control system Manual de usuario Pagina 5

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