AERMEC URX CF, Selection And Installation Manual

Heat recovery units with refrigeration circuit - 

URX_CF

 -

6

Selection and installation manual 

GB

Description of the components

Panels and structure

: 

the structure is made up of 20 mm thick 
galvanised self-supporting sandwich panels 
with injected polyurethane insulation ( density 
of 40 kg/m

3

).  The construction of the casing 

simplifi es installation and maintenance.

Fans: 

double intake centrifugal fans with forward-
curved blades and with directly connected 
motor. The 230V - 50 Hz single-phase motor 
has one speed.  The airfl ow is controlled by 
an electronic regulator at phase cut. The two 
regulators are set in the factory so as to supply 
the nominal performance;

 the air volume may 

be varied by +/- 15% to the nominal airfl ow, 
not to endanger the correct operation of the 
unit.

Refrigerating circuit:

this is a highly effi cient and silent heat pump 
with scroll compressor, four-way valve for 
cycle inversion, evaporating coil, condensing 
coil,  liquid receiver, liquid separator, 

thermostatic valve, liquid indicator, fi lter drier, 
high/low pressure switch and the pressure 
/ charge connections with access from the 
outside of the units.

Condensate drain pan: 

made of aluminium alloy, easily detachable.

Evaporating/condensating coil: 

with Cu grooved tube and high effi ciency Al fi ns.

Filters: 

these are cell type with an corrugated septum 
positioned before the recovery unit on airfl ow 
supply and return. The standard fi lters are class 
G3 type in accordance with classifi cation UNI 
EN 779 with weighted effi ciency of 80%. They 
are 48 mm thick and are easily withdrawn for 
cleaning and replacement.

Dirty fi lters pressure switch: 

a differential pressure switch is present, pla-
ced close to the electronic controllers, for the 
detection of the choking of the supply fi lter. It 
is possible to set the intervention value. Thre 
pressure switch includes clean contacts (NA, 
NC) to remote the alarm.

Heat recovery unit:

this is static with crossfl ow made of aluminium 
sheets. During winter operation, the average 
effi ciency is above 50% ensuring fi rst-class 
energy recovery from the air expelled from 
the room.   

Support brackets

:

allow the unit to be rapidly and securely 
fi xed to the false ceiling. 

Accessibility:

The unit may be inspected from below. The 
heat recovery unit, fi lters, condensate drain 
pan and fans can be easily removed from 
below by removing the lower two panels.

Control system

The unit is equipped with an electrical panel 
with power and regulation section (including 
the three-way valve for the additional hot 
water coil and related servomotor), aimed 
at guaranteeing the management of all 
refrigerating circuit functions. Also present: 
NTC temperature probe on the internal air 
recovery, external air temperature probe, 

air damper and related servomotor in the 

free-cooling version, pressure probe on the 
recovery fi lter. A remote control terminal is 
also supplied for the automatic management 
of the unit, remotable up to 150 meter (cable 
not supplied). 
The unit is equipped for the management 
of a luminous sign (230V) which switches 
on in case of generic alarm or unit OFF, in 
conformity with the norms in force for rooms 
for smokers.
The following operations can be performed 
on the microprocessor: switching on and 
off of the unit, summer/winter changeover, 
setting of set-point parameters, reading of 
room temperature.

N.B. For further information refer to 
the User manual.

Legenda

1 Compressor
2 Electric panel

3

 Centrifugal fan

4

 G3 filter

5

 Heat recuperator

6

 Heat exchanger

7

 Condensate drain

8

 Electronic regulators

URX_CF

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