10
GENERAL FEATURES
Options
Constructive
configuration
VB - Base version It only allows to operate with all return air.
V1 - 1 damper version It allows to operate with a fixed percentage of outdoor fresh air, manually set.
V2 - 2 dampers version
It allows to operate with a variable percentage of outdoor fresh air, adjusted by
the unit controller according to free cooling and air quality control algorythms.
V3 - 3 dampers version
It allows to operate with a variable percentage of outdoor fresh air, adjusted by
the unit controller according to free cooling and air quality control algorythms.
Moreover it manages the expulsion of an air flow rate equal to the outdoor fresh
air flow rate.
Air flow
position
Standard
(frontal or upwards)
For the models of frame 1 and 2 the standard position is frontal while for the
models of frame 3 the standard position is upwards.
Downwards It is available for all the models and it allows a more compact installation.
Internal fan
Standard
In order to adjust the performances of the internal fan to the air flow rate and
available head values required, for each model are available three type of inter-
nal fan that are different for pulleys used, electrical motor installed power and in
some cases for the kind of fan used.
The pulley installed on the electrical motor is a variable diameter type pulley
and allows, within certain limits, to adjust the performance curve of the fan to
the characteristic curve of the plant.
Upsized
Reduced
Heating
integration
Hot water coil
2 or 3 rows
with pipes
It performs the heating function (as heat pump integration or replacement), the
post heating function (in cooling mode) and the ice protection function. It is
equipped with automatic air vent, drain valve, shut off ball valves at the inlet and
outlet, safety valve (6 bar) and stainless steel condensate tray.
The ball type motorized 3 way valve is managed by the unit controller according
to an on-off logic.
Hot water coil
2 or 3 rows
with 3 way valve
Electrical heater coil
standard or upsized
It performs the heating function (as heat pump integration or replacement), the
post heating function (in cooling mode) and the ice protection function. It is
equipped with safety thermostat and is protected against overcurrents by me-
ans of fuses placed inside the electrical panel.
Condensing
gas heating module
standard or upsized
It performs the heating function (as heat pump replacement) and the ice pro-
tection function. The stainless steel air-fumes exchanger is coupled with a mo-
dulating premixed burner that allows to adjust the power supplied inside a wide
operating range and to maximize the exploitation of the fumes condensing heat
also at part loads.
Low noise acoustic setting up
It allows to reduce the noise emissions produced by the unit through the insula-
tion of the walls of the compartment that contains the refrigerant circuit and the
use of sound absorbent jackets on the compressors. Such setting up includes
also the modulating control of the external fans.
Air flow silencers
They allow to reduce the noise transmitted to the conditioned ambients through
the air ducts. They are realized by mineral wool acoustic baffles with fiberglass
coating placed downstream the centrifugal internal fan.
They are available only for the models of frame 1 and 2 with standard "Air flow
position" option.
External fans control
The modulating control of the external fans allows to operate with low outdoor
temperatures in cooling and high outdoor temperatures in heating and permits
to reduce noise emissions in such operating conditions.
The fans rotational speed is modulated continuosly by a phase cut device that
allow to control the condensing pressure (in cooling) and the evaporation pres-
sure (in heating) according to the value read by the temperature probe placed
on the liquid line.
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