PACKAGED ROOFTOP UNITS
50EN/EH 90-360
Energy saving / recovery options
■■ Free-cooling management
The operation of the unit in free-cooling allows the outdoor
air conditions to be taken advantage of when these are more
favourable than those of the return (or ambient) air. As such,
this allows the cooling capacity to be reduced under these
circumstances.
Note: the free-cooling function is not compatible with the
activation of the recovery circuit.
The percentage of air refreshing will range from 0% to 100%.
There are three options for the free-cooling management:
-- Thermal, with comparison of temperatures.
-- Enthalpic, with comparison of enthalpies.
-- Thermoenthalpic, with comparison of enthalpies and a
correction for temperature.
Thermal
free-cooling
■■ Active recovery
Circuit dedicated to recovery, with independent control,
adapted to the air refreshing requirements in order to raise the
COP and EER of the unit set.
-- Centrifugal fan or electronic plug-fan in top box MRC0
or MRC1.
-- Air circuit comprised of coils with copper pipes and
aluminium fins.
-- Thermostatic expansion valve with external
equalisation.
-- Hermetic scroll-type compressor with sound
insulation, assembled over antivibration mounts.
-- Crankcase heater.
-- Four-way cycle reversing valve (heat pump units).
-- Anti-acid dehydrator filter.
-- Condensates drain pan.
Specific humidity
return
extraction
Dry temperature
new air
Enthalpic
free-cooling
Specific humidity
reversible
recovery
circuit
outlet
Specific humidity
Thermoenthalpic
free-cooling
Dry temperature
--
C
A
R
R
I
E
R
2
0
1
6
/
2
0
1
7
AIR TREATMENT
ing
ergy sav
More en
CONTROLS
Dry temperature
■■ Safety options
-- Soft starter of the supply
and/or return centrifugal fans
(optionals) which prolongs
the set time mainly aimed at
installations with cloth ducts.
Compulsory for motors with an
output of 15 kW and above.
-- Differential pressostat for the
detection of clogged filters.
-- Differential pressostat for control of air flow, with
centrifugal fan (optional).
-- Smoke detecting station in accordance with
the NF S 61-961 standard.
-- Refrigerant leak detector. This
allows prompt identification
of gas leaks, guaranteeing
the safety of any people in
the vicinity. Installation of the
device ensures compliance
with European standards
F-GAS and EN378 as well as ASHRAE 15.
819