Lennox FLEXAIR FAC 085, Инструкция по применению

Страница: 12 / 80

• 10 •
10°C
Application Guide / FLEXAIR-AGU-1505-E
Free cooling:
It is one of the most important features of this rooftop as it maximise
seasonal ef
fi ciency by reducing the use of thermodynamic cooling
in mid season.
Intelligent fresh air management:
With accurate percentage of fresh air the dampers are regularly
calibrated to introduce just the required amount of fresh air in the
building to reduce annual energy consumption. The fresh air ratio
can also be controlled using the indoor CO2 level as an input.
Intelligent heating priority optimization:
This unique feature on the market, allows the user to program the
priority between the different heating elements (thermodynamic,
electric pre-heaters or auxiliary heating). This is particularly
interesting on dual fuel units or units with electrical pre-heaters.
This feature maximizes energy ef
fi ciency by optimizing heat pump
operation depending on the outdoor temperature.
Full Scheduling
Impressive energy savings can be done with a proper time-
scheduling that optimizes the unit operation to the different load
scenarios of each installation.
For that reason the Climatic offers a weekly-based calendar with
up to 7 time-bands per day and 4 pre-set modes (Unoccupied,
Day, Day 1, Day 2).
For each of this pre-set modes, plenty of unit settings can be
optimized to the different moments of the day, for example during
the unoccupancy periods the comforrt setpoints could be relaxed,
during the energy-cost peaks hours the hot water coils or gas
burners could be preferred to compressor or electrical heaters,
fresh-air introduction can be reduced to warm-up the building
before customer arrival, etc.
1 2
Unoccupied mode Day mode
3 4
Day1 additionnal mode Day2 additionnal mode
Start time
Z1 = 08h00
Gradient : 10 min / °C
Actual switch-on
Z1 = 07h30
Actual temp.
7°C
Morning anticipation and dynamic set point
The unit can be programmed to switch-on in the morning to reach
the occupied zone temperature set point just in time.
The rooftop will start heating the building at a different time in
the morning depending on the outdoor temperature: The lower
the outdoor temperature, the earlier the rooftop would start to
ensure that the set point is reached by the time the
fi rst occupied
zone (Z1) is starting. This is to avoid early start when outdoor
temperature is mild.
Example for a unit programmed to anticipate morning switch-on
if outdoor temperature is below 10°C at a rate of 10 minutes/°C.
Dynamic set point can be used in summer to offset the ambient
temperature set point according to the outdoor temperature.
This is to avoid large temperature difference between indoor and
outdoor. The indoor temperature set point would then increase
with the outdoor temperature improving comfort and saving large
amount of energy.
Communication and unit interlink
Master/slave or cascade control is a standard feature of the
FLEXAIR units. It can be used to connect up to 24 rooftops.
The units can then be programmed to optimize ef fi ciency and
improve reliability following 6 different strategies
Multi rooftops regulation
In case of multi-rooftop installations, The Climatic control of each
unit can improve the unit synergies and optimize the total air-
conditioning performance, without any additional cost or external
dedicated "Building Manager System", but just linking the units
together (up to 8) in the same network and appling any of the
following smart strategies::
1: Master Slave "total":
The master gives the ventilation order, its set point and its room
temperature/humidity/CO2 to all other rooftops.
2: Master Slave "temperature":
The master gives the ventilation order and its room temperature/
humidity/CO2 to all other rooftops, but they have their own set
point.
1- GENERAL DESCRIPTION
10°C