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General Description
7 PRODUCT DESCRIPTION
7.1 General Information
AQVL/AQVH units are one-block type with two re-
frigerant circuits. They are intended to cool down the
water required for any air-conditioning application
as well as any other fluid, such as for example glycol
water. These units are completely assembled at works.
They are equipped with all the refrigerating connec-
tions and the internal electrical wiring required for
a rapid installation on the field. An operation test is
performed after assembly, with water flowing through
the refrigerant/water exchanger in order to make
sure that every refrigerating circuit is properly work-
ing. The refrigerating circuits of every unit are pres-
sure tested before inspection, drained and charged
with R410A.A low noise level is the result of a careful
study. It is achieved on chillers by using technologi-
cally advanced components without negatively affect-
ing the operation performances and limits of the units.
7.2 Body and Frame
The base and frame of these units are made with gal-
vanized steel elements, assembled with stainless steel
screws. All panels can be removed to ensure easy ac-
cess to internal components. All galvanized steel parts
are protected by epoxy powder paint.
7.3 Compressors
The models are equipped with four SCROLL airtight
tandem compressors with an internal motor protec-
tion. The compressors of all models are assembled on
rubber shock absorbers. Their motors can be directly
started. They are cooled down by the aspirated re-
frigerant gas and equipped with internal thermistor
protections against overloads. Overload protections
are automatically reset after having tripped. The com-
pressor terminal box has anIP21 protection degree.
Compressors are powered on and off by the micro-
processor of the unit control system which is intended
to control the delivery of the thermal refrigerating ca-
pacity.
7.4 Evaporators
Evaporators are made of stainless steel plates. They
are thermally insulated by means of a thick flexible
insulating mattress with closed cells. The maximum op-
erating pressures correspond to 10 bar for the water
side and to 45 bar for the refrigerant side. Antifreeze
protection for the water in the exchangers is ensured
by electrical heaters and differential pressure switches.
7.5 Condensing coils
Condensers are coils made of copper tubes arranged
in staggered rows and mechanically expanded inside
an aluminium finned pack. The maximum operating
pressure on the refrigerant side of the condensing bat-
teries is 45 bar.
7.6 Condenser Fans
The condenser fans are of a helical type. They are di-
rectly coupled and have an impeller with wing con-
toured aluminium blades. Each fan is equipped with
a galvanised steel accident-prevention protection
which is painted after manufacture. The fans motors
are completely closed. They have an IP54 protection
degree and a protection thermostat embedded in the
windings.
7.7 Fans Control
All models have a step speed controller as a standard.
It will act according to the condensing pressure and al-
low the operation down to an Air temperature opera-
tion of +10°C.
7.8 Refrigerating Circuits
Each unit has a double refrigerating circuits equipped
with external service valves intended to measure the
refrigerant pressure and charge, sight glass with a
humidity indicator, dryer filter and thermal expansion
valve. Refrigerating circuits are also complete with
high pressure switch as well as high and low trans-
ducer.
7.9 Control Supply Panel
All components of the control system and those neces-
sary to start the motors are shop connected and tested.
The control compartment contains an electronic card
and a control board with an external keyboard and
display, to show the operational functions, as well as
the intervention of the alarms and the working blocks.
Summary of Contents for AQVC 105
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