Page 5 - Application Guide 04-2003 / Rooftop BALTIC Series - Page 5
FEATURES AND BENEFITS standard unit
This allows CLIMATIC™ 50 to send an alarm when damper can
not be calibrated (faulty damper )
Specific case of high pressure drop in the return air duct :
The problem becomes even more critical, when the return air
duct pressure drop is greater than 50 Pa.
In this case, due to the difficulty of the return air to go back to
the rooftop, it is usual to have a lot more fresh air entering the
building than wanted, resulting in high running cost.
RUNNING COST
Scroll compressors / Refrigeration Circuits
Copeland Scroll compressors is used on the BALTIC for maxi-
mum efficiency and reliability, having overload protection and
crankcase heaters.
Multiple refrigerant circuits (starting from size 30) comprising
compressors, condenser coils and direct-drive condenser fans,
evaporator coil and belt-driven Centrifugal Indoor fans, expan-
sion valves, high capacity dryers, high pressure switches,
low pressure switches, full refrigerant charge. In addition you
will find check valves, defrost control, reversing valve on BHK
heat pump models.
Thermostatic Expansion Valves
As it is important that the units operate as efficiently as possible
and achieve maximum performance at any running condi-
tion, the thermostatic expansion valves optimise the superheat
of the rooftop and, therefore, its overall performance efficiency.
Alternate defrost
Because, this new rooftop has been designed to reduce life
cycle cost, the alternate defrost is a standard feature with 2
circuits heat pump rooftops.
When one circuit is in defrost the other is still running in heat-
pump mode reducing the use of costly electric heater.
This unique feature on the market place for small rooftop makes
the BALTIC a pionneer in terms of low life cycle cost.
Dynamic defrost (under patent INPI 91.033.063)
BALTIC is featuring the "dynamic defrost" concept.
Typical rooftop starts defrost cycle when the outside temperature
is bellow a certain value and repeat the cycle periodically.
This results sometimes in starting an expensive defrost cycle
when it is very cold outside but very dry, in other words when
the coil is not frozen.
After many test in the Lennox laboratories, it was found that it is
possible to exactly know if the coil is frozen, by analysing the
temperature difference between the coil and the outside
temperature.
With this built-in feature of the CLIMATIC™ 50, Lennox insures
to start a defrost cycle only when necessary, hence saving
energy.
A : High ! in return air duct, B : Low ! in return air duct
% %
% %
% fresh air ratio in the supply air
% %
% %
% damper opening ratio
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