Lennox FLEXAIR FAC 085, Инструкция по применению

Страница: 23 / 80

• 21 •
1
2
2 1
Application Guide /FLEXAIR-AGU-1505-E
2- OPTIONS DESCRIPTION
POWER EXHAUST FAN
1
→ 2: ESP “Supply” in eLencal.
Power exhaust axial fans with gravity exhaust dampers provide
exhaust air pressure relief when high levels of outside air are
being introduced in the building with good air tightness.
It is interlocked to run when return air dampers are being closed
and supply air blower is in operation. The power exhaust fan runs
when outdoor air dampers are at least 50% open (adjustable
by set point). It is also overload protected. A gravity exhaust
damper is supplied with this option to prevent air from entering
the unit when fan is off.
Building air tightness Medium
Fresh air & Free cooling
High fresh air rate
Free cooling
Pressure drop in the
return ductwork
Medium 50 Pa to 150 Pa
Building pressure control Low control
Typical applications Light commercial, petrol stations...
EXTRACTION ROOFCURB
1
→ 3: ESP Return in eLencal
3 → 2: ESP Supply in eLencal
Where system balancing is critical and return ductwork pressure
drop is high, it is recommended to use extraction fan such as
the one located in the extraction roofcurb.
A plug fan installed with a 3rd damper (1 inside the Roofcurb
+ 2 inside the rooftop), is able to extract up to 300 Pa with the
Nominal air
fl ow rate of the unit. This roof curb can be used in
either horizontal or down fl ow applications.
Building air tightness High
Fresh air & Free cooling
High fresh air rate
Free cooling
Pressure drop in the
return ductwork
High > 150 Pa
Building pressure control Pressure balance possible
Typical applications
Theatres, cinemas, data centres, new air
tight buildings with long return ductworks