Automatic Functions; General; Starting Sequence; Cooling Recovery - Swegon COMPACT Air Operation And Maintenance Instructions

10

AUTOMATIC FUNCTIONS

10.1 General

The COMPACT has a number of automatic functions. The
operation of the unit is influenced when certain functions
are activated.

10.1.1 Starting Sequence

The COMPACT has a starting sequence with factory-preset
time delay between every step as follows:
1. The damper relay is energized and opens the shut-off
damper (if installed).
Time delay: 30 seconds.
2. The extract air fan starts and the heat exchanger is con-
trolled to provide max. heat recovery.
Time delay: 90 seconds.
3. The supply air fan starts.
Time delay: 180 seconds (from the time when the extract
air fan has started).
4. The temperature regulation function begins according
to its regular settings.
The starting sequence prevents the extract air fan from
starting if the shut-off damper is closed. By starting the
extract air fan first, and the heat exchanger as well, the
system also avoids chilling the premises with cool supply
air under cold weather conditions.

10.1.2 Cooling Recovery

Cooling energy recovery is an automatic function that
helps the air handling unit utilize the relative "cooling
energy" that may be present indoors if cooling is required
and the outdoor temperature is high.
The heat exchanger rotates at max. speed and in this way
recovers the relative cooling energy or chilliness in the
extract air.
The conditions for this function to be activated are that
there is a cooling demand and that the outdoor tem-
perature is 1 °C higher than the extract air. The function
is switched out when the cooling load ceases to exist or
when the outdoor temperature is the same as that of the
extract air.
The text COOLING RECOVERY is shown in the hand-held
micro terminal.

10.1.3 Zero Point Calibration

The pressure transducer of the unit is automatically cali-
brated. This calibration is carried out 3 minutes after the
unit has been stopped.
The text ZERO PT CALIBR is shown in the hand-held micro
terminal.
The fans cannot start while calibration is in progress.
Registered design. The company reserves the right to make design changes without prior notice.
10.1.4 Additional cooling – Electric Air Heater
The fans continue to operate at min speed for 3 minutes
after the air handling unit has been stopped to cool the
electric heating elements if the electric air heater has been
operating.
The text ADD COOLING appears in the hand-held micro
terminal.

10.1.5 Additional running - Heat Exchanger

The rotary heat exchanger automatically continues to
rotate ca 1 minute after the air handling unit has been
stopped.
It takes a little time for the fans to stop rotating after a
stop order has been entered in the micro terminal. This
prevents the admission of cool supply air into the premis-
es.

10.1.6 Density-corrected Airflow

The density of the air is different at different temperatures.
This means that a specific volume of air will change at dif-
ferent air densities.
The GOLD automatically corrects this, so that correct air
volume is always obtained.
The control equipment always shows the corrected air-
flow.
10.1.7 BOOSTER-function
(Applies to COMPACT Heat only)
COMPACT Heat can be used for heating the room with
BOOSTER function.
If the BOOSTER function is used, the extract air fan and
the heat exchanger are switched off. The damper in the air
recirculation section is reset and room air is circulated. The
louvre damper for exhaust air closes to prevent any cold
down draught.
The electric air heater (7.5 kW) heats up the air. A change-
over damper in the lower section of the air handling unit
is reset and the air is led to the air discharge outlets at the
bottom of the unit. The air is discharged at high velocity
and follows the floor surface by means of the so-called
coanda effect. This enables long throw lengths and quickly
heats the entire premises.
The BOOSTER function is activated automatically when the
supply air temperature is higher than the extract air tem-
perature or the room temperature.
GB.COMPACTAHSK.210520
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