1.1.3 Description of the unit
Compressors
type compressors with internal motor protection and external sump resistor included as standard, which
keeps the oil hot for easier start-up and to prevent its drag outside the compressor. They are charged
with a POE (polyol-ester) oil to avoid the formation of foam.
VAC-VAH 20A, 25A, 30A and 40A units have just one compressor and VAC-VAH 45A, 60A, 75A and
90A units have two compressors with two independent circuits.
The compressors have been specifically designed for units with heat pumps: their mechanical compo‐
nents are large and their motors have a lower current consumption.
The compressors have dampers to reduce operating noise and vibrations.
Based on the accumulated operating hours of each compressor, a control circuit determines the order
of operation, thus lengthening their working life.
Suction accumulator (models with heat pump only)
Connected to the compressor suction pipe, this protects it from hammering by liquid.
Coils
These are large and made of copper tubes and aluminium fins. They are located inside the unit, protected
against knocks during transportation and installation.
To adapt the product perfectly to its environment, there are options such as coils with Blue-Fintype fins
or copper fins.
Indoor fan (on VIR 25A model only)
A centrifugal fan driven by an independent motor and with belt transmission is installed in the VIR 25A
model.
Indoor fan (models VIR 40A, 45A, 60A, 75A and 90A)
One, two or four centrifugal fans with a joint shaft, driven by an independent motor and connected to a
single plenum are installed in the models indicated.
Outdoor fan (VAC-VAH models)
One, two or four axial fans with free discharge, no ducts and low operating noise levels are installed in
the models indicated.
Optionally, a summer cycle operating speed adjuster can be fitted that is adjusted by the high pressure
of the cooling circuit.
Cooling circuit
The cooling circuit is made of welded copper pipes and includes access connections on the high and
low-pressure sides. It is fitted with shut off valves on the suction side that are used in the factory to protect
the compressor during the 45 bar pressure test that all units must pass.
The VAC-VAH and VIR units are supplied with pre-connections for welding.
Refrigerant
The gas refrigerant must be fully charged during on-site installation.
The entire range of units uses environment-friendly, recyclable R-410A gas refrigerant.
Cooling circuit protection
All cooling circuits are supplied as standard with high and low-pressure switches, dehydrator filter on the
liquid line, discharge temperature cut-out switch, liquid sight glasses and temperature sensors for supply
air, suction liquid and outdoor air.
1
User manual
1.1
General description of the unit
4
