SPLIT-SYSTEM UNITS 38NZ/NF & 40NZ/NF
Enregy saving / recovery
■■ Free-cooling
On units with mixing box, the free-cooling can be managed
by the electronic control. This function 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. The percentage of air renewal 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.
■■ The circuit is composed by:
• Plug-fan in vertical-design box with MRC000 assembly.
• 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 r eversing valve (heat pump units).
• Anti-acid dehydrator filter.
• Condensates drain pan.
supply
Thermal
free-cooling
return
Specific humidity
extraction
38NZ/NF
40NZ/NF MFVA
new air
Dry temperature
alpic
enth
o
m
r
The -cooling
free
rgy
e
re en
es mo
It sav
Specific humidity
Thermoenthalpic
free-cooling
Dry temperature
Note: With enthalpic or thermoenthalpic free-cooling change to the CARRIERrtc
electronic control is obligatory
■■ Active recovery (models 182 to 360)
-- Circuit dedicated to recovery, with independent
control, adapted to the air renewal requirements in
order to raise the COP and EER of the unit set.
•
Greater efficiency aeraulics of the rotor (impeller jet with
optimized profile), with very high available pressure.
•
Greater efficiency of the motor, DC motors of permanent
magnets powered by electronic switching integrated in
the motor.
•
Variable speed that allows to keep the outlet flow
constant regardless of the degree of clogging of filters.
•
Accurate measurement of flow, a section calibrated
in the fan aspiration and a differential pressure sensor
allow control handling flow reliably both on VAC as VAV
systems.
CONTROLS
Specific humidity
Dry temperature
■■ Plug-fan
-- Electronic plug-fans in outlet and/or return with
variable speed and flow sensor.
Note: With this option change to the CARRIERrtc
electronic control is obligatory.
-- Facilities type of service industries consumption of
fans associated with air transportation assumes a high
% of the annual consumption of air conditioning. The
use of fans of greater efficiency has a direct impact on
the reduction of consumption. Plug-fans with variable
speed have associated the following advantages:
• Elimination of friction loss of the transmission by direct link.
Note: With this option change to the CARRIERrtc
electronic control is obligatory
C
A
R
R
I
E
R
2
0
1
6
/
2
0
1
7
AIR TREATMENT
recovery circuit
Enthalpic
free-cooling
805