AERMEC URX CF User manual

URX_CF
EN
HEAT RECOVERY UNITS WITH REFRIGERATION CIRCUIT
SELECTION AND INSTALLATION MANUAL
0313. 6180417_03


Index
English
Remarks 4
Description of the units 5
Description of components 6
Accessories 7
Technical data 8
Operational limits 10
Sound data 10
Performance variations cooling and heating 11
Fans available static pressure 11
Fresh air temperature variations on the change of the expelled
air temperature 12
Thermal efficiency, Pressure drop air side accessories MBC, SUF 13
Refrigerating circuit 14
Dimensions 15
Accessories Dimensions 18
Installation and use of the unit 22
Positioning of the supporting brackets 23
Connection of ducts 24
Hydraulic connections of the condensate drain 24
FCE free-cooling accessory 25
Electrical connections 26
Maintenance of the unit 27
Filters 27
Condensate drain pan 27
Heat recovery 27
Motor ventilating assembly 27
Heat exchanger coil 28
Decommissioning 28
Waste disposal 28
Diagnosis and troubleshooting 29

Heat recovery units with refrigeration circuit - URX_CF -
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Selection and installation manual
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Remarks
This manual is an integral part of the
documentation enclosed with the unit.
It must be kept for future reference
and must accompany the machine
throughout its life.
The manual defines the purpose for which the
machine has been built and establishes its correct
installation and the limits of its use.
• This manual describes all the use, installation
and maintenance instructions of the subject
unit and the main accident prevention
standards.
• Carefully and thoroughly read all the
information referred to in this manual. Pay
particular attention to the norms accompanied
by the indication “DANGER” or “ATTENTION”
since, if not observed, may cause damage to
the unit or to people.
If any malfunctions are found out, whciha are not
included in this manual, please contact the local
After-Sales Service immediately.
• Aermec S.p.A. declines all liability for any
damage caused by the improper use of the
machine or the partial or superficial reading of
the information contained in this manual.
• Installation and maintenance must be
performed by qualified and experienced
personnel, having the requirements that
are foreseen by law 46/90 and/or the DL
380/2001 for the electrical/electronic
and air-conditioning installation, with
consequent registration at the local
CHAMBER OF COMMERCE, if this is
not so, Aermec S.p.A. declines all
responsibility regarding the safety of
the product.
THE MANUFACTURER DECLINES ALL
LIABILITY FOR DAMAGE TO THINGS OR
INJURY TO PERSONS AND ANIMALS
CAUSED BY THE FAILURE TO OBSERVE THE
INSTRUCTIONS AND STANDARDS IN THIS
MANUAL.
Although suitable risk analysis have been
performed during the design of the URX_
CF unit, PAY ATTENTION to the pictograms
on the machine which help understand the
manual better, rapidly catching the attention
of the reader concerning the risks which
can not be avoided or sufficiently limited
through the use of technical protection
means and measures.
GENERAL HAZARD SIGNAL
Carefully adhere to all the indications
next to the icon.
Failure to comply with the instructions may
generate hazardous situations with possible
damage to the health of the operator and user in
general.
DANGEROUS ELECTRICAL
VOLTAGE SIGNAL
Carefully adhere to all the indications
next to the icon.
The signal indicates components of the unit or, in
this manual, specifies actions that could generate
electrically-related risks.
GENERAL PROHIBITION SIGNAL
Carefully adhere to all the indications
next to the icon that limit actions in
order to guarantee better operator safety.
MAIN WARRANTY
CONDITIONS
• The warranty does not cover payment for
damages cause by the incorrect installation
of the unit by the installer.
• The warranty does not cover payment for
damages cause by the improper use of the
unit by the user.
• The manufacturer is not responsible for
accidents to the installer or user that are
due to the improper use and incorrect
installation of the unit.
The warranty is not valid when:
• the maintenance and repairs have been
performed by unauthorised persons or
companies;
• the unit has been previously repaired or
modified with spare parts that are not
original;
• the unit has not undergone suitable
maintenance;
• the instructions described in the present
manual have not been followed correctly;
• unauthorised modifications have been
made.
N.B.:
The Manufacturer reserves the right at
all times to make any modification for
the improvement of its product and is
not obliged to add these modification
to machines of previous manufacture,
which have already been delivered or
are being built.
The warranty conditions are any subject
to the general sales conditions at the
moment the contract is finalised.

Heat recovery units with refrigeration circuit - URX_CF -
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Selection and installation manual
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fig.01
Exhaust air expulsion or
inspection refrigerating circuit
External air
intake
Exhaust air expulsion
or inspection refrigerating circuit
External air
intake
By-pass for
free-cooling
Internal air
recovery
Internal air
supply
Field 1, 2, 3: URX
Field 4, 5: 07 - 10 - 15 - 21 - 33
Field 6, 7: CF
Description of the unit
The URX_CF series is the mono-
damper solution to the needs of
systems normally used in bars,
restaurants, offices, meeting rooms.
The URX_CF units, which are divided
into five sizes with a rated airflow from
750 to 3300 m3/h, have been designed
to guarantee a healthy thermo-
humidity condition allowing a suitable
change of air in order to reduce the
build-up of gas and unwanted particles
present in the environment to be
treated (cigarette smoke, unpleasant
odours, sweat, dust,.).
The URX_CF unit, in addition
to the ventilation, filtration and
recovery of heat, also includes, in a
mono-bdamper unit, a heat pump
refrigerating circuit. This allows to
obtain a complete machine which
operates independently in all seasons
and which is capable of combining
the necessary renewal of air with an
efficient recovery of heat.
The accurate design of the machine
combines the extremely compact size,
which makes installation on suspended
ceilings easier, with easy accessibility
for the maintenance of all internal parts.
This gives the opportunity, also thanks
to the management and installation
simplicity, to satisfy many system
requirements.
WARNING
The URX_CF series is made to guaran-
tee indoor air supply and extraction.
The refrigerating circuit is calculated
not only for giving supply air characte-
ristics near to that of the indoor air, with
the aim of avoiding disease conditions
near vents, but also for covering in part
ambient thermal loads. Thermal and
refrigerating capacities, which carry air
conditions from the indoor air ones to
those who cover in part ambient ther-
mal loads, are referred to as Thermal
Available Capacity and Refrigerating
Available Capacity. These capacities are
only an integration of those guaranted
by a conditioning unit.
The URX_CF series is not a conditioning
unit, and it cannot be set apart from a
conditioning unit if prefixed indoor air
conditions (temperature and humidity)
have to be guaranteed.
Available versions
The URX_CF units are available in 5
sizes:
Each model can be configured in
such a manner to satisfy the system
requirements by suitable combining the
available options.
The table in fig. 01 shows the procedure
of the commercial acronym in the 7
fields from which it is made, which
represent the options present.

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Selection and installation manual
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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/m3). The construction of the casing
simplifies 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 airflow 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 airflow,
not to endanger the correct operation of the
unit.
Refrigerating circuit:
this is a highly efficient 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, filter 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 efficiency Al fins.
Filters:
these are cell type with an corrugated septum
positioned before the recovery unit on airflow
supply and return. The standard filters are class
G3 type in accordance with classification UNI
EN 779 with weighted efficiency of 80%. They
are 48 mm thick and are easily withdrawn for
cleaning and replacement.
Dirty filters pressure switch:
a differential pressure switch is present, pla-
ced close to the electronic controllers, for the
detection of the choking of the supply filter. 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 crossflow made of aluminium
sheets. During winter operation, the average
efficiency is above 50% ensuring first-class
energy recovery from the air expelled from
the room.
Support brackets:
allow the unit to be rapidly and securely
fixed to the false ceiling.
Accessibility:
The unit may be inspected from below. The
heat recovery unit, filters, 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 filter. 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
3Centrifugal fan
4G3 filter
5Heat recuperator
6Heat exchanger
7Condensate drain
8Electronic regulators
URX_CF
1
2
3
3
4
4
5
6
6
7
8

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Selection and installation manual
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fig.02
Accessories
Available accessories
Mod. 07 10 15 21 33
MBC MBC07 MBC10 MBC15 MBC21 MBC33
MBX MBX07 MBX10 MBX15 MBX21 MBX33
G4F G4F07 G4F10 G4F15 G4F21 G4F33
SUF SUF07 SUF10 SUF15 SUF21 SUF33
FGC FGC07 FGC10 FGC15 FGC21 -
FCE FCE07 FCE10 FCE15 FCE21 FCE33
RBX RBX 07 RBX10 RBX15 RBX21 RBH33
SUF
MBC
FGC
MBX - RBX
MBC Hot water coil module
This is an external module that can be
installed downstream from the motor fan
assembly on the fresh air flow, fitted with:
Two-row water heating coil with copper
pipes and aluminium fins with P2519
geometry. The manifold collectors are
equipped with a ½" G UNI 338 threaded
connector for the water inlet and outlet.
The three-way valves and related ON/
OFF actuator are also included.
MBX Module with electric heating
battery
This is an outside module that can be
installed downstream from the motor fan
assembly on the fresh air flow, fitted with:
Electric heating element with armoured
finned elements equipped with double
safety thermostat with automatic and
manual reset.
RBX Module with electric heating
battery
This is an outside module that can be
installed upstream from the motor fan
assembly on the fresh air flow, fitted with:
Electrical resistance in two-stage finned
armored elements with double safety
thermostat with automatic reset and
manual.
G4F G4 efficiency filters
The units can be fitted with two cell-
type filters with corrugated septum
in class G4 according to the UNI EN
779 classification (weighted efficiency
of 90%) which can be placed as a
replacement of the G3 filters. The
filtrating cell is 48 mm thick.
SUF Module with silencers
The accessory is made up of two modules
that are equipped with silencer baffles
positioned on the supply and exhaust.
They are made of rockwool panels
with the surfaces in contact with the air
and protected by a polyester film held
between two galvanised and micro-
perforated laths.
FGC circular flanges
The accessory is supplied as a single unit.
The accessory is made up of flanges
which connect to the rectangular port of
the unit so as to allow the use of circular
ducts.
The accessory is not available for size 33.
N.B. for further information, see the
tables in this manual and the various
accessories kits; see fig. 02 below
regarding compatibility
FCE Free-cooling
The “free-cooling kit ” includes 2
dampers with related ON/OFF 230V
servomotors.
For further information refer to the Use
manual.
RS485 Interface card
Interface card necessary for the interface
to supervisione systems according to the
MOD-BUS protocol.

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Selection and installation manual
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Technical data
Caution: the electronic regulators that are
incorporated in the machine allow to regulate
the air flow in the limits indicated in the
previous table in order to set the system. Once
setting has been completed, the regulators no
longer need to be touched.
(1) Fan power supply: 230 V; nominal airflow rate;
without accessories;
(2) Operating conditions: return air 26°C 50%, external
air 34°C 50%;
(3) Operating conditions: return air 20°C 50%, external
air -5°C 80%;
(4) At a free field distance of 1 m with ports canalized.
URX_CF MODEL 07 10 15 21 33
External and Recovery air nominal flow rate [m3/h] 750 1000 1500 2100 3300
Minimun air flow rate [m3/h] 640 850 1275 1785 2800
Available supply static pressure (1) [Pa] 278 233 239 166 289
Available exhaust static pressure (1) [Pa] 248 218 233 163 273
Total heating capacity (rec. + compr.) (3) [kW] 8,8 10,8 15,8 22,8 33,3
Total refrigerating capacity (rec. + compr.) (2) [kW] 6,1 7,3 10,2 15,0 23,0
Heating available capacity (3) [kW] 2,4 2,3 3,0 4,8 5,2
Refrigerating available capacity (2) [kW] 1,4 1,7 2,2 3,4 5,1
Recovered heating capacity (3) [kW] 2,9 4,3 7,1 10,1 14,3
Recovered refrigerating capacity (2) [kW] 0,9 1,3 2,0 2,8 4,2
Compressor heating capacity (3) [kW] 5,9 6,5 8,7 12,7 19,0
Compressor refrigerating capacity (2) [kW] 5,2 6,0 8,2 12,2 18,8
Total input power (Heating mode) (3) [kW] 2,0 2,0 3,3 4,0 5,5
Total input power (Cooling mode) (2) [kW] 2,6 2,8 3,8 5,0 6,9
Sound pressure level at 1 m (4) [dB(A)] 53 55 57 59 62
Electric supply 1-230-50 1-230-50 3+N-400-50 3+N-400-50 3+N-400-50
HEAT RECUPERATOR
Efficiency [%] 46,2 51,2 53,2 53,6 53,6
FANS
Number of fans 22222
Fans total nominal input poweri [kW] 0,75 0,84 1,02 1,24 2,5
Fans total maximum input current [A] 4,8 4,8 7,2 7,2 13,2
Fan speed (+/- 15 %) impostable impostable impostable impostable impostable
Protection class IP 55 55 55 55 55
FILTERS
Classification according to EN779 G3 G3 G3 G3 G3
Quantitative efficiency [%] 80 80 80 80 80
REFRIGERATING CIRCUIT (COMPRESSOR)
Refrigerant R410A R410A R410A R410A R410A
Quantity refrigerant [Kg] Consult AERMEC Technical Departiment.
Winter mode compressor input power (3) [kW] 1,3 1,3 1,8 2,5 3,0
Summer mode compressor input power (2) [kW] 1,8 2,1 2,3 3,5 4,4
Compressor maximum current input [A] 8,2 12,5 7 11,1 19,7

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Selection and installation manual
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ACCESSORIES
(1) Inlet/outlet water temperature 70/60°C. Compressor
running. Operating conditions: return air 26°C 50%,
external air 34°C 50%;
(2) Inlet/outlet water temperature 45/40°C. Compressor
running. Operating conditions: return air 26°C 50%,
external air 34°C 50%;
MBC - Water heating coil 07 10 15 21 33
Rows [n] 22222
Front surfaces [m2]0,13 0,13 0,24 0,24 0,29
Air side pressure drop at nominal flow rate [Pa] 11 18 23 42 78
Heating capacity (1) [kW] 5,0 6,0 8,7 10,3 16,8
Heating capacity (2) [kW] 1,9 2,2 3,4 3,7 7,5
Water flow rate (1) [l/h] 442 523 763 902 1475
Water side pressure drop (1) [kPa] 16 22 9 12 31
Water flow rate (2) [l/h] 336 382 584 638 1306
Water side pressure drop (2) [kPa] 11 14 6 7 28
MBX - Electric heating coil
Alimentation 3 ph - 400 V - 50 Hz (separate power supply from the unit)
Heating capacity [kW] 3,0 4,5 6,0 9,0 12,0
Air side pressure drop at nominal flow rate [Pa] 10 10 10 10 10
Stages [n] 11111
Electric heating element current input [A] 4,6 6,8 9,1 13,7 18,2
RBX - Electric preheating coil
Alimentation 3 ph - 400 V - 50 Hz (separate power supply from the unit)
Heating capacity [kW] 4,0 6,0 8,0 12,0 18,0
Air side pressure drop at nominal flow rate [Pa] 10 10 10 10 10
Stages [n] 22222
Electric heating element current input [A] 5,8 8,6 11,4 17,2 26
Manifold diameters
Condensate drain pan discharge diameter [in] 1” 1” 1” 1” 1”
Water coil manifold diameter [in] 3/4” 3/4” 3/4” 3/4” 3/4”

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Selection and installation manual
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Operation limits
In their standard set-up, the equipment
is not suitable for installation in a
saline environment. The maximum and
minimum limits of the airflow rate to the
exchanger are indicated by the curve of
the pressure drops diagram. Refer to fig.
043 for the operating limits.
N.B: Please contact Aermec technical
sales office in the event it is necessary
to operate the machine outside the
limits indicated in the diagram.
Summer mode: Winter mode:
(heat pump)
fig.03
07 10 15 21 33
Max external temperature during cooling °C 38 38 38 38 38
Min external temperature during cooling °C 16 16 16 16 16
Max internal temperature during cooling °C 34 34 34 34 34
Min internal temperature during cooling °C 18 18 18 18 18
Min external temp with heat pump operating °C -10 -10 -10 -10 -10
Max external temp with heat pump operating °C 24 24 24 24 24
Max internal temp with heat pump operating °C 30 30 30 30 30
Min internal temp with heat pump operating °C 14 14 14 14 14
Sound data
Sound pressure by band central frequence (Hz) Sound pre. Sound Pre. Sound Pow.
63 125 250 500 1000 2000 4000 8000 Total Total Total
dB dB dB dB dB dB dB dB dB dB (A) dB (A)
07 56 55 51 50 49 44 40 33 60 53 64
10 59 60 54 52 50 45 41 35 64 55 66
15 62 65 57 54 51 47 42 36 68 57 68
21 64 69 60 55 52 48 43 38 71 59 70
33 67 74 63 57 53 49 44 39 75 62 73
63 125 250 500 1000 2000 4000 8000 Sound pressure
dB dB dB dB dB dB dB dB dB dB (A)
07 65 57 54 57 54 50 53 48 67,0 60
10 66 58 56 60 57 57 57 52 68,8 64
15 67 59 58 62 60 61 63 57 71,1 68
21 66 61 58 67 62 65 68 63 73,8 72,5
33 69 61 59 64 71 71 63 58 76,1 75,5
Sound pressure measured at 3m distance from the free vent of the supply fan:
63 125 250 500 1000 2000 4000 8000 Sound power
dB dB dB dB dB dB dB dB dB dB (A)
07 57 64 59 61 62 58 51 44 68,7 65,3
10 59 69 63 66 66 63 57 50 73,3 70
15 57 68 63 65 66 64 59 52 72,9 70,3
21 53 65 60 66 66 65 61 54 72,3 70,8
33 61 71 68 71 71 71 68 62 78,2 76,6
Sound power level from the supply vent:
• Attenuation of sounda data with SUF - Module with silencers (accessory)
63 125 250 500 1000 2000 4000 8000
dB dB dB dB dB dB dB dB
SUF 9 0 2 5 5 9 14 11
• Data outside the panel: (the data are calculated at the following conditions: 1 m. distance from the unit, ducted supply vent and in free field)
• Sound data on the supply fan vent
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
26
12 14 16 18 20 22 24 26 28 30 32
14
16
18
20
22
24
26
28
30
32
34
36
38
40
16 18 20 22 24 26 28 30 32 34 36
t int (°C)t int (°C)
t ext (°C) t ext (°C)

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Selection and installation manual
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Performance variations cooling and heating
The URX_CF series heat recovery unit with
refrigerating circuit allow the renewal of
the internal air giving the necessary hourly
change in order to obtain the ideal comfort
conditions.
The use of a high efficiency cross-flow heat
recovery unit and a heat pump refrigerating
circuit allows, in most applications and in
the most common external air temperature
conditions, in addition to the neutralisation
of the heating load of the external air, to
supply an adequate heating and cooling
capacity to compensate the internal heating
loads. Fig. 4 illustrates the graph from which
it is possible to take the coefficients to be
multiplied by the nominal values which are
present in the technical data table so as to be
able to determine the total refrigerating and
heating performance based on the outside
conditions. fig.04
fig.05
The variations of the static pressure used
by the fans to change the air flow (which
can be set by means of the electronic
regulators during the setting phase) in
relation to the nominal values present in
the technical data table, are represented in
the graph of fig. 5.
The curve is valid for all sizes of the URX_
CF series. Keep the feed to the fans at the
maximum value.
As an example, a unit of the URX_CF 15
series is considered.
The following performances are taken
from the technical data table:
nominal delivery flow rate 1500 m3/h;
nominal recovery flow rate 1500 m3/h;
available delivery static head = 223 Pa;
available recovery
static head = 206 Pa.
It is supposed that the pressure drops
of the air distribution system on the
supply side are equal to 210 Pa, while
the pressure drops of the air distribution
system on the exhaust side are equal to
180 Pa.
Fans available static pressure
The "Effective useful pressure/Nominal
useful pressure" reports are 210/223
= 0.94 and 180/206 = 0.87
respectively. The coefficients that can
be taken from the graph are 1.08 and
1.18.
Therefore the effective flow rate on
the supply side is 1500 x 1.08 = 1620
mc/h; the effective flow rate on the
exhaust side is 1500 x 1.18 = 1770
mc/h.
Outdoor air temperature [°C]
Key
Internal air temperature
Summer operation: 26 °C 50% RH
Multiplicational coefficient
Internal air temperature
Winter functioning: 20 °C 50% RH
Effective useful head/Nominal useful head
Corrective coefficient for the cooling capacity according to the variation of the room temperature in summer and winter mode:
SUMMER MODE:
Room air temperature 22°C, 50% RH --> corrective coefficient = 1,109
Room air temperature 24°C, 50% RH --> corrective coefficient = 1,033
Room air temperature 26°C, 50% RH --> corrective coefficient = 1
Room air temperature 28°C, 50% RH --> corrective coefficient = 0,963
WINTER MODE:
Room air temperature 18°C, 50% RH --> corrective coefficient = 0,945
Room air temperature 20°C, 50% RH --> corrective coefficient = 1
Room air temperature 22°C, 50% RH --> corrective coefficient = 1,056
Room air temperature 24°C, 50% RH --> corrective coefficient = 1,133
0,60
0,70
0,80
0,90
1,00
1,10
1,20
1,30
-10-5 0 5 10152025303540
Variazione della resa frigorifera
resatermica resa frigorifera
Heating capacity
Refrigerating capacity
0,70
0,75
0,80
0,85
0,90
0,95
1,00
1,05
1,10
1,15
1,20
0,80 0,85 0,90 0,95 1,00 1,05 1,10 1,15 1,20 1,2
5
P.statica utile ventil.
Effective flow rate/nominal flow rate
Variation of cooling capacity

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Selection and installation manual
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Fresh air temperature variations on the
change of the external air temperature
The following charts allow to determine
the variation of the temperature within
the room on the variation of the external
conditions. The variability of the air flow
is that allowed to guarantee that the
refrigerating circuit operates correctly.
N.B.
The following diagrams are typical for
all sizes, but without accessories
Summer use
X= T ext Y = media ΔT
Q nom Q nom-15% Q nom+15%
26 -4,20 -5,21 -3,26
30 -1,18 -2,26 -0,36
34 0,00 -1,05 0,90
40 2,53 1,26 3,44
Winter use
X= T ext Y = media ΔT
Q nom Q nom-15% Q nom+15%
-5 0,00 3,02 -1,84
0 2,73 5,25 0,26
5 5,56 8,27 3,07
10 8,67 11,53 6,38
15 11,89 14,58 9,36
20 15,09 18,03 12,70
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
252627282930313233343536373839
REGIME ESTIVO
Q
nom.
Q
nom-15%
Q
nom+15%
Variation of the inlet air temperature (°C)
Summer use
Winter use
Variation of the inlet air temperature (°C)
External air temperature (°C)
At the nominal air flow
At the nominal air flow + 15 %
At the nominal air flow - 15 %
-5
0
5
10
15
20
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
REGIME INVERNALE
Qnom. Qnom-15% Qnom+15%
At the nominal flow rate + 15 %
At the nominal flow rate - 15%
At the nominal flow rate
Conditions: exhaust air 26°, 50% R.H.
Conditions: exhaust air 26°, 50% R.H.
External air temperature (°C)

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Selection and installation manual
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Thermal efficiency, Pressure drop
air side for accessories MBC, SUF
The diagram in fig. 06 allows to determine
the coil thermal efficiency of the MBC
accessory for each model based on the Td
of the inlet water and Td of the inlet water
air. The corrective factor to multiply for the
nominal capacity value are present in the
technical data table.
Fig. 07 illustrates the pressure drops (Pa)
on the air side based on the flow rate for
the MBC and SUF accessories
Fig. 08 illustrates the pressure drops (kPa)
water side of the MBC accessory coil.
N.B.:
The pressure drops illustrated in the
diagram also include those of the three-
way valve.
fig.06
External air temperature [°C]
fig.08
Water flow rate l/h
kPa
Air flow rate m3/h
Pa
fig.07
Corrective factorPressure drop air side
Pressure drop water side
45/40 °C
70/60 °C
46'
46'
.#$
.#$
.#$
46'
-"#
-"#
-"#

Heat recovery units with refrigeration circuit - URX_CF -
14
Selection and installation manual
GB
Refrigerating circuit
KEY
CP Compressor
BC Condensing coil
BE Evaporating coil
VME Summer supply fan
VMI Winter supply fan
SL Liquid separator(*)
VU One way valve
IL Liquid indicator
F Filter
VE Thermostatic valve
RL Liquid receiver
PA High pressure probe
VIC Valvola inversione di ciclo
AP High pressure switch
BP Low pressure switch
SV Solenoid valve(**)
(*) Only present in 07 and 10 models.
(**)Only present in 07 model.

Heat recovery units with refrigeration circuit - URX_CF -
15
Selection and installation manual
GB
Dimensions
URX07CF - URX10CF
Weights and centres of mass
kg Gx Gy
URX07CF 205 700 650
URX10CF 218 700 650
Supply
fan
Exhaust
fan
By-pass for
free-cooling
External air
suction
External air
suction
Expulsion of exhaust
air or inspection of
refrigerating circuit
Electric
panel
Expulsion of
exhaust air or
inspection of
refrigerating
circuit
h'5.)
'X
'Y

Heat recovery units with refrigeration circuit - URX_CF -
16
Selection and installation manual
GB
h'5.)
URX15CF - URX21CF
Weights and centres of mass
kg Gx Gy
URX15CF 272 800 750
URX21CF 298 760 750
Supply
fan
Exhaust
fan
By-pass for
free-cooling
External air
suction
External air
suction
Expulsion of
exhaust air or
inspection of
refrigerating circuit
Electric
panel
Expulsion of exhaust
air or inspection of
refrigerating circuit
'X
'Y
999,6

Heat recovery units with refrigeration circuit - URX_CF -
17
Selection and installation manual
GB
h'5.)
URX33CF
Weights and centres of mass
kg Gx Gy
URX33CF 328 850 800
Supply
fan
Exhaust
fan By-pass for
free-cooling
External air
suction External air
suction
Expulsion of
exhaust air or
inspection of
refrigerating
circuit
Electrical
panel
Expulsion of
exhaust air or
inspection of
refrigerating circuit
'X
'Y
1011

Heat recovery units with refrigeration circuit - URX_CF -
18
Selection and installation manual
GB
Accessories Dimensions
SUF - Silencer baffle modules
Key
1. Inspection panel set
2. Lower panel bdampering profile
3. Upper fixing bracket
4. Silencer
5. Baffles fixing bracket
6. Duct accessories connection flange
% &%
GD
C
,
!
MIHIM
B
Mod. [mm] URX_CF 07-10 URX_CF 15-21 URX33CF
A 600 600 600
B 835 835 835
C 400 500 550
D 30 30 30
E 31,5 31,5 31,5
F 537 537 537
G 337 437 487
H 490 490 490
I 50 50 50
L 632 632 632
M 108 108 108

Heat recovery units with refrigeration circuit - URX_CF -
19
Selection and installation manual
GB
MBC
L
EFE
A
C
GD
NO
P
Q
B
IM
H
I
M
L
EFE
A
C
GD
B
IMHIM
Mod. [mm] URX_CF 07-10 URX_CF 15-21 URX33CF
A 600 600 600
B 435 435 435
C 400 500 550
D 30 30 30
E 31,5 31,5 31,5
F 537 537 537
G 337 437 487
H 250 250 250
I 50 50 50
L 632 632 632
M 28 28 28
N 40 40 40
O 85 85 85
P 278 278 278
Q 127 127 127
MBC - Water coil modules
MBX - RBX
MBX - Electrical coil modules
RBX - Preheating Electrical coil
modules

Heat recovery units with refrigeration circuit - URX_CF -
20
Selection and installation manual
GB
SUF, MBC, MBX and RBX assembly
Accessories MBC, MBX, RBX and SUF
are equipped with:
- “L” supporting brackets;
- a flange for the accessory connection
to the unit;
- a flange for the accessory connection
to the ducts.
- viti M6 screws to tighten the accessory
to the unit;
- only for MBX and RBX: electrical box
put outside the accessory;
- only for MBC: electrical cables for
connection between three way valve
servocontrol (230V, ON/OFF running)
and electrical box and between electri-
cal box and unit electrical panel;
- only for MBX and RBX: electrical
cables for connection between coil and
electrical box and between electrical
box and unit electrical panel (electrical
cables for coil electrical supply and
protection differential magnetic switch
are not supplied).
Fot accessories installation on the cei-
ling and their connection to the unit
please refer to the following instructions:
- position the support brackets on the wall
following the instructions at page 24;
- unscrew totally the screws form the
unit in correspondance of the holes
which couples with accessory flange;
- draw the accessory MBC, MBX, RBX
and SUF to the unit;
- screw the screws previously unscre-
wed and by screws equipped with the
accessory, the accessory and its flan-
ge to the unit prepared with threaded
hexagonal inserts;
- connect electrical cables coming from
the accessory electrical box to the unit
electrical panel (please refer to electri-
cal schemes equipped with the unit).
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