CTS RTSK-ROOFTOP

A roof-top unit is the cheapest and most versatile solution for the air conditioning, expecially for middlelarge commercial and industrial rooms.

The unit is designed with a condensing and evaporative section on a rigid support, already assembled and ready for use (see picture below).

They are available in 17 sizes with cooling power from 13 up to 300 kW and air flow from 2.000 mc/h up to 52.000 mc/h, in the following versions:

• Cooling only.
• Reversible heat pump
• Economizer (including return fan, motorized dampers for exhaust, recirculating and fresh air)
• Mixing box with two motorized dampers

Available also in the version with Bioxigen system.

CHARACTERISTICS

Standard version –Construction features
STRUCTURE. The structure consists of the following parts:Frame made from extruded aluminium alloy profiles, “Anticorodal 63” type 6060 T5 to UNI 3569, with double flange and ledge for the gasket, Perimeter base made up of press-bent passivated galvanised plate, Sendzimir Z200 type to UNI5753-84, very thick, minimum 20/10, able to guarantee minimum deflection. The perimeter ring is connected by crossbeams so as to uniformly distribute the loads. The section bars are joined using bolts and nuts.
Double skin panels rigidly fastened to the frame with special age-resistant resin gasket to ensure perfect air tightness over time. The panels are internally insulated with polyurethane or mineral wool with density > 40 kg/m³. The thickness of the panels is 25/50 mm.

COMPRESSORS.
The units are provided with SCROLL compressors, R407C refrigerant gas. The refrigerant circuit includes shut-off valve on discharge as well as on liquid line, integral thermal protection, electrical heater for the polyester oil.

CONDENSER / EVAPORATORS AMBIENT AIR SIDE.
Coil with cupper tubes, internally ruled, and highperformance aluminium fins. Aluminium support frame. Axial fans directly coupled to IP54, 6 poles motor. Aerofoil low noise coated aluminium blades complete of safety guards in painted galvanized steel. Motors including thermal protection. Axial fans speed regulation according to ambient temperature.

REFRIGERANT CIRCUIT.
The refrigerant circuit, made in cupper tubes, includes: thermostatic expansion expansion valve, liquid receiver, regenerating dehydrating filter, liquid and humidity presence indicator, high and low pressure safety switches, high and low pressure gauges, refrigerant gas filling tap, thermal insulation of low pressure lines.

CONDENSERS/EVAPORATOR ROOM AIR SIDE.
Coil with cupper tubes, internally ruled, and highperformance aluminium fins. Aluminium support frame and stainless steel insulated drain pan. DIDW centrifugal fan with forward blades connected to a 3- phase motor, including thermal protection, belt drive with adjustable pulleys.

ECONOMIZER.
It is a mixing box with 2 dampers, consisting of aerofoil aluminium blades complete of gaskets and modulating attuators 24 V a.c. . Tanks to a fresh air probe, it is possible to operate in free-cooling mode (summer and winter), setting the proper temperature. The fresh air damper can be set to grant a minimum renewal of the air. Weatherproof casing provided on fresh air intake.

ECONOMIZER AND PLATE HEAT RECOVERY SECTION.
It is an optional section consisting of a 3 dampers mixing box, cross-flow plate heat exchanger and return fan.
The 3-ways mixing box (recirculating, exhaust and fresh-air) include motorized aluminium aerofoil blade dampers, complete of gaskets and modulating attuators 24 V a.c. (0-10V dc). Tanks to a fresh air probe, it is possible to operate in free-cooling mode (summer and winter), setting the proper temperature.
The cross flow heat exchanger is sized according to the required minimum fresh air, independently from the free-cooling section, granting energy saving. The opening of the fresh and exhaust air dampers, corresponding to the air flow through the plate exchanger, is regulated by the controller (software).

FILTER SECTION.
The unit includes a standard G4 pleated filter. On demand, they are available additional rigid bag filters (F6, F7 or F9) with low pressure drop.

INDIRECT GAS FIRED HEATING SECTION.
It is an optional section including heat exchanger and gas burner. The combustion chamber is made from AISI 430 and heat exchanger with high quality steel tubes (AISI 304 on demand). The burners can be, according to the capacity and/or demand, of the following types: one stage, two stages as well as modulating. The unit is suitable fo connection to an external chimney for flue gas (not supplied, c/o contractor).

ELECTRICAL BOARD.
The Electrical board, designed according to european norms IEC 204-I/EN 60204-I, includes main switch with looking door device. All cables are properly marked.

CONTROL SYSTEM.
The system is controlled by means of microprocessor with alphanumeric display. It is possible to visualize the control parameters of the unit, reading alarms and possibilty to print them (printer not included). The air temperature is controlled on the return but monitoring the supply limit values. The microprocessor can be interfaced to a remote PC by means of a supervision program and communication protocol MODBUS (not included in the offer). The units can be also supplied with a remote keyboard (200 m maximum) to control temperatures, set-point, normal operation and alarms.