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 reversing valve (heat pump units). Anti-acid dehydrator ﬁlter. Condensates drain pan.
e re en es mo It sav
• • •
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.
With enthalpic or thermoenthalpic free-cooling change to the CARRIERrtc electronic control is obligatory
Note: With this option 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.
lpic ntha rmoe oling The -co free rgy
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.