Page 4 - Application Guide 04-2003 / Rooftop BALTIC Series
FEATURES AND BENEFITS
standard unit
More reliable refrigeration circuit
To minimise the risk of leaks, refrigeration circuit has been
drastically simplified to reduce the number joints (potential cause
of leak). For example a BALTIC BHK40 would have only 28joints,
when a typicall rooftop of the same size would have38 joints).
The second inovation of the refrigeration circuit will reduce
maintenance time.
All joints and all pipes are located in the refrigeration section.
This includes evaporator collector located in the same
compartment. Service technician only have one door to open to
access the whole circuit.
INDOOR AIR QUALITY DOES MATTER
Fire proof (M0) insulation
Because, for LENNOX, health and safety issues cannot be
compromised, in all rooftops fire insulation (M0 fire Class) is
fitted as standard. 65 kg/m3 insulation is mechanically fitted to
the unit.
This feature improves the safety of the rooftop against fire, as
the specification suggests, the insulation will not burn and smoke
is not generated.
Edges of insulation are protected on the edge to perfectly seal
the insulation.
Removable Aluminium Drain Pan
This gives the drain pan a longer life. The underside of the unit
is insulated to reduce condensation.
The bent drain traps are shipped in a kit form. Drain pan is
sloped to prevent stagnation of water. It is removable with 2
screws. It slides out and can be easily cleaned, preventing
growth of bacteria in the drain pan.
Accurate percentage of fresh air
Because a fresh air damper curve is not linear, it is not accurate
to assume that the percentage of opening of the damper is equal
to the percentage of fresh air enterring the building.
However, this linear control of a damper is by far the most used
in the industry.
With Indoor air quality and running cost of a building being more
important to our customer, Lennox wanted to pilot the % of fresh
air more accurately.
The CLIMATIC™ 50 can now periodically recalibrate the
dampers, in calculating the real percentage of fresh air entering
the bulding for the each different positions of the damper.
This recalibration is achieved using the return air sensor, the
outdoor sensor and supply air sensor. When all heating or
cooling elements are off, the percentage of fresh air actually
entering the rooftop is the result of the following equation :
"%Fresh Air" =
( "Supply Air temperature" - "% Return Air" x "Temperature Return Air" )
"Temperature Fresh air"
For example, CLIMATIC™ 50 would accurately adjust the
damper position to get 20% fresh air and not 30% or 10%.
Therefore, this feature either saves a lot of energy cost by not
bringing more fresh air than needed or makes sure that air
quality is at the expected level.
