Page 8 - Application Guide 04-2003 / Rooftop BALTIC Series
FRESH AIR AND EXHAUST AIR
Economiser
"Free cooling" is provided through the use of fresh air
where appropriate rather than cooling the return air. The
use of an economiser is the easiest and most efficient way
to modulate fresh volumes and reduce running costs for a
rooftop application, as well as improving air quality. Fully
controlled by the CLIMATIC™ 50, it is also able to ensure that
minimum fresh air is provided in line with Indoor Air Quality
Regulations. Economiser operates using a "sensible" control.
It is possible to prevent the economiser from
supplying air below a certain temperature (adjustable set point,
10°C as default).
The economiser is factory fitted and tested, prior to shipment
and includes 2 dampers operating from a 24V actuator. It
includes a rain hood factory fitted. Hood will be folded during
transportation to limit risk of damage and is unfolded on site.
Gravity exhaust damper
Installed with economiser assembly, gravity exhaust damper
relief pressure when outside air is being introduced in the
system. It is a cheap and smart way to avoid overpressure in a
building.
NOTE : When horizontal flow configuration is required, the
multidirectional roofcurb must be installed.
Power Exhaust Fan
Installed with economiser assembly, it provides exhaust air pres-
sure relief when high levels of outside air are being introduced
in the system.
Interlocked to run when return air dampers are being closed
and supply air blower is in operation. The extraction fan runs
when outdoor air dampers are at least 50% open (adjustable).
It is also overload protected. A gravity exhaust damper is
supplied with this option to prevent air from entering the unit
during shutdown.
INDOOR AIR QUALITY
Analogic Blower On sensor and dirty filter indication
A differential pressure sensor measures the pressure drop
across the evaporator coil and filters. If this pressure drop is
above 50Pa, the rooftop is considered to be operating. The exact
pressure drop can be seen through the Intelligent CLIMATIC™
50 board. This option further improves security and reliability
of the BALTIC rooftops. It prevents overheating of any device if
the fan belt is broken.
Using the same pressure sensor as the "Blower On Sensor",
pressure drop information is interpreted by the CLIMATIC™ 50
board to determine whether the filter is dirty or not. This
information is available with all CLIMATIC™ 50 controllers.
The set point between "dirty" and "clean" is fully adjustable by
the installer/users. (Default value is approximately 250Pa)
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