12
GENERAL SPECIFICATIONS
LIMITS TO OPERATION
The main limits to operation for the appliances in question are given in the following table:
SELECTION CRITERIA
- Configuration:
The convector fan series with centrifugal ventilator includes three versions: VM-B with cabinet and intake from
below, VM-F with cabinet and frontal intake and lastly, VN without cabinet for built-in or ceiling-mounted installation.
Depending on the specific installation requirements, select the version required in compliance with the indications
in Figs 1 to 6. The particular shape of the condensation tray allows the same appliances to be installed either ver-
tically or horizontally. All units are produced with wet couplings on the left-hand side and the electric part on the
opposite side as standard supply. If the position of the wet couplings must be inverted, the units and set of availa-
ble accessories are pre-engineered for this operation which is described in detail in the installation manual. There
is a wide range of accessories for the various units, allowing these latter to be configured to suit the most varied
plant layouts. The list of available accessories and their compatibility with the various versions and sizes is given in
Tab.10 which is followed by a brief description of the actual accessories themselves.
- Technical specifications:
Tab.2 gives the significant values of the units in the nominal operating conditions mentioned in the table itself. Refer
to the enclosed tables with the individual parameters if the operating conditions differ.
Selection examples:
An example of how a unit is selected is given in order to describe how to use the graphs or tables in the manuals.
The configuration of the unit is obviously bound to the type of system envisaged, thus the selection will be made
considering that the unit will operate in the same conditions as those given for different types of system. The follo-
wing applications will therefore be considered:
A) system with two pipes for heating and cooling
B) system with four pipes
C) system with two pipes plus electric heating element
D) system with two pipes and ducted unit.
Example 1
The convector fan must guarantee the following specifications:
Total refrigerating capacity 2700 [Watt]
Sensible refrigerating capacity 2100 [Watt]
Operating ambient temperature 27 [°C] b.s and 19 [°C ] b.u
The value must be obtained at medium speed.
Thermal power 4000 [Watt]
Operating ambient temperature 20 [°C ] b.s
Water flow rate as in cold mode for two units.
The value must be obtained at medium speed.
MODEL
15
20 30
40
60
80
100
120
Max. temperature limits (°C)
85 85 85 85 85 85 85 85
Max pressure limits(bar) 88888888
Min.flow r.(l/h) 100 100 100 100 150 200 300 300
Max.flow r.(l/h) 700 700 800 800 1100 1400 2100 2100
Min.flow r.(l/h) 50 50 50 50 100 100 100 100
Max.flow r.(l/h) 350 350 350 350 700 700 700 700
Main bank flow
rate limits
Limiti di portata
batteria
supplementare
Tab.3
Dry bulb temperature [°C]
Wet bulb temperature [°C]
Minimum tem-
perature of inlet
water
To prevent condensation from forming on the external
structure of the appliance, the minimum temperature
of the water must not be lower than the limits given in
the graph on the left, which depend on the thermo-
hygrometric conditions of the surrounding air.
The above limits refer to operation at minimum speed.
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