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Application Guide / FLEXAIR-AGU-1505-E
As managing fresh air is becoming mandatory in most buildings
economiser is now fi tted as standard with the FLEXAIR.
Advanced control pack
Where a higher level of controllability is required to make the
FLEXAIR even more fl exible, LENNOX have compiled a pack
that includes two advanced control features.
• "Enthalpy control on economiser".
The eCLIMATIC and its humidity sensors (return air and fresh
air) ensures that the economiser does not use 100% fresh
air if the outside air has a higher enthalpy than the return air.
This feature is relevant in regions where the relative humidity
is high or when the desired room air condition is very dry.
• "Humidity control"
The eCLIMATIC and its humidity sensors, analyze dry and
wet bulb temperatures to control dehumidifi cation. Humidity
control is only available if ambient temperature is in cooling
or dead zone. The dehumidifi cation algorithm can dry the air
by passing it through the coil in cooling mode.
A specifi c function in the program can be activated to control
the minimum supply air temperature, by maintaining it equal
to the heating set point, using auxiliary heaters (Electric, Hot
water coil or gas burner).
A proportional 0-10V contact is also available to control an
external humidifi er.
Indoor air quality sensor
Indoor air quality is controlled from the eCLIMATIC main
controller. A VOC (Volatile Organic Component) sensor detects
the amount of CO2 in the ambient air between 0 and 2000PPM.
(This obviously varies depending upon space occupancy levels).
The VOC sensor sends a proportional signal (0-20mA) to the
eCLIMATIC controller which will then modulate the fresh air.
Low Noise Option
As rooftops are often installed in a noise sensitive area, LENNOX
proposes a low noise option on FLEXAIR. To achieve low noise
level, FLEXAIR receives a quieter fan, a compressor jacket and
is fully equipped with acoustic isolation in the refrigerating box.
Anti corrosion protection
When the units are installed in potentially aggressive
environments, which can often be the case for example in coastal
environments, it is often a requirement that the coils are specially
treated to protect them against the corrosive effects.
LenGuard™ anti-corrosion treatment is available for condensers,
evaporators and hot water coil.
2.6- REFRIGERATION OPTIONS
2.7- FRESH AIR OPTIONS
2- OPTIONS DESCRIPTION
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