Roof-Top Units


Robust unit capable of meeting very several requirements designed and constructed for use in Hazardous areas for Oil & Gas and Marine Sector or ambient in which is request to guarantee a high corrosion resistance and a reliable long service life.  All components are dimensioned and calculated for an optimal performance at the required design parameters.

Internal cooling system with direct expansion of R134a refrigerant gas.

Condensing section able to operate in environments up to + 45°C (+ 50°C On request).

Many options are available depending on your needs.

This description is referred to the version normally request.

Each unit can be customized according to the type of treatment required, the dimensions available in the field and the levels of noise and vibration allowed.


  • System recommended for cooling power between 10Kw and 100Kw.


Framework: Entirely built in stainless steel 1.4404 (AISI 316L).

Base-frame: Robust bent plate having thickness depending on the unit’s weight, complete of all the arrangements for the handling.

Panels: Double skin panels in stainless steel AISI 316L (42mm thk) provided in the Air treatment section, while single skin panels are provided both for the Condensing and for the Power and Control section.

Maintenance and inspection panels are fitted with nylon hinges and stainless steel handles.


Regulating damper on inlet side.

Filters G4 Class (EN 779).

Filters F7 Class (EN 779).

Evaporating coil with copper tubes and fins epoxy painted (other protection available).

Drop Separator in Polypropylene (PP).

Drain pan in AISI 316L, 1.5mm thk.

Electrical heater in AISI 316L with finned armored elements in AISI316Ti/316. Power rated on your need.

Air Supply fan in AISI 316L, direct driven (belt driven available on request).

Anti-spark track in copper alloy.

Electric motor in cast iron, asynchronous three-phase, IE3, rated Power 7.5Kw (for airflow range between 7.500 and 9.500 m³/h @ 600Pa static external), 400V/3ph/50Hz painted RAL5017 (C5M).

Actuated damper on outlet side.


Condensing Coil with copper tubes and fins, electro tinned.

Refrigerant Fluid R134a.

Axial Fan in stainless steel AISI 316L with plastic impeller direct coupled to the motor. Electric motor in cast iron, IE3, rated Power 2.2Kw, 400V/3ph/50Hz painted RAL5017 (C5M), double speed type for condensing control.

Reciprocating Compressor 400V/3ph/50Hz, rated power 11.0Kw, 2 steps of capacity control (50% -100%).


Electric switchboard for Power and control installed in a dedicated section on board of the Unit, already cabled.

Casing in aluminum alloy, painting for marine ambient, Ex db IIB+H2 T4, Complete of all power components such as:

  • Switching feeder;
  • Transformer for auxiliary circuit;
  • Internal cable labelling;
  • Space heater with thermostat.

Complete of all control components, such as:

  • Signal and Safety LED bulbs (on front panel);
  • Hand switches and buttons (on front panel);
  • PLC for system management with Modbus TCP/IP communication protocol.


Thermostatic expansion valve.

Differential pressure indicators for air filter status – Magnehelic (No.2).

Differential pressure switch High for filters (No.2).

Differential pressure switch Low (No.1) for Fan monitoring.

Liquid receiver.

Isolation valves.

Solenoid valve.

Filter for refrigerant fluid with replaceable cartridge.

Charge nozzle with Schrader valve.

LP pressure gauge.

HP pressure gauge.

HP/LP Pressure switch.

Two stages pressure switch for condensing control.

Pressure Safety Valves (No.2).

Tubing in AISI 316L for status filters monitoring system.

Internal MCT in AISI 316L for wall crossing.

Cable glands in AISI 316.

TAG plates in AISI 316L.

Refrigerant piping in hard drawn copper.

Complete charge of R134a.

Wiring with cables according to specific requirements.

Other components necessary for the completion.


(Data referred to CU1002RTU – being totally customizable units all Data can be modified according to project specifications)

Cooling Power: 33,4Kw (with external +40°C / Internal +24°C @50%RH)

Heating Power: 4 Kw

Power Rated: 25Kw

Airflow: 7.500m³/h

External static pressure: up to 800Pa

Power supply: 400V/3ph/50Hz (other options on request)

Dimensions: 4000L x 1600W x 2100H (mm)

Weigh: 2750Kg

ATEX Classification: Zone 2 IIB T3


  • Availability of several type of power feed.
  • Solutions achievable with several types of refrigerant gases.
  • Evaporator and condenser available with additional coatings for an excellent corrosion resistance.
  • Available option for Hazardous areas (Zone 1 and 2).
  • Safety and Control Devices built-in type.
  • Possibility to remote all the signals or commands.
  • Reliable automatic temperature control.
  • Possibility of any kind of customization
  • Possibility of providing redundant systems within a single skid.


  • Directive 2006/42/EC (EU Machinery Directive)
  • Directive 2014/35/EU (Low Voltage Directive)
  • Directive 2014/30/EU (EMC Directive)
  • Directive 2014/68/EU (PED Directive)
  • Directive 2014/34/EU (ATEX Directive)
  • EN 378-2
  • Further options in additional may be request (for example ISO 15138), etc.


  • Oil & Gas.
  • Shipbuilding.
  • Industry.


  • UPS Room;
  • Electrical Room;
  • LER;
  • Control Room;
  • Instrument Room.