GB.COMPACTUT.170622
Registered design. The company reserves the right to make design changes without prior notice.
42 www.swegon.com
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 energised and opens the shut-off
damper (if installed).
Time delay: 30 seconds.
2. The extract air fan starts and the heat exchanger is
controlled to provide max. heat recovery. Additional hea-
ting (if installed) is activated to generate 40% of its max
capacity.
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 tempe-
rature 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.
10.1.4 Anti-frost Monitoring Function – Air Heater
for Hot Water
The anti frost monitoring function is always active if the
air heater for hot water connected has been supplied by
Swegon.
The function activates a heating device that maintains 13
°C in the coil while the air handling unit is in operation
and 25 °C in the coil when the unit is stopped. An alarm is
initiated and the unit is stopped if the temperature sensor
senses a temperature below 7 °C.
10.1.5 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.
10.1.6 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 premi-
ses.
10.1.7 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 COMPACT automatically corrects this, so that correct
air volume is always obtained.
The control equipment always shows the corrected air-
flow.
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