Roof top unit with integrated gas burner
Heat pump indoor coil Heat pump outdoor coil Gas burner
Refrigeration 14ºC WB 22ºC WB 12ºC a 48ºC -Heating 10ºC 27ºC -10ºC WB b 15ºC WB -30ºC
Air intake conditions Minimum Maximum Minimum Maximum Minimum
a With condensation pressure control activated, operation
down to -10ºC.
b For outdoor temperatures below -8ºC WB, it is compulsory
to select the antifreeze protection option for the electrical cabinet.
High and low pressure switches. Control of the compressor discharge temperature. Anti-return valve integrated into the compressor. Electronic thermistor on the compressor. Differential pressure switch for checking the air flow. Main door switch. Thermal-magnetic protection on the compressor and fan motor power supply line. Automatic control circuit switch.
Casing made of galvanised sheet steel panels, with polyester paint in RAL 7024 graphite grey and white. Thermal insulation (10 mm thick), with M1 fire classification. Free-standing frame and access panels for the electrical cabinet, compressors, fans, etc.
Two-speed propeller fans with direct coupling to the motor. Class F sealed motor, IP54 with internal heat protection. Dynamically-balanced propellers and external protective grille. Coil comprising copper tubing and aluminium blades.
Complete electrical cabinet, fully wired and insulated to prevent condensation. IP55 protection. Transformer for power supply without neutral. Main earth connection. Compressor and fan motor switches.
Centrifugal belt- and pulley-driven fans. Two impellers with double intake, with forward curved blades on the wheel. Maintenance-free, lubricated ball socket. Two electric motors with tensioner, class F, IP55 and internal heat protection. Reusable air filters, mounted on a frame. Coil comprising copper tubing and aluminium blades. Galvanised steel condensate drain pan.
CIATrtc electronic control
a pGD1 terminal (room control console) for maintenance and system start-up, and sensors. The system uses an RS485 field-bus to manage additional components. A CMS card is used to connect the control card to a centralised management system. It also manages the local connection between units on a pLAN and information to be communicated, for a maximum of 15 units.
Propane or natural gas burner, built in accordance with the regulations in force and with the directive 90/396 EEC relating to gas appliances. Power control with 0-10 V proportional actuator performed by the burner control. Condensation boiler, with pre-mixing and modulation technology, used to achieve efficiency levels of almost 105% of the lower heating value (LHV). AISI 430 stainless steel combustion chamber and hot gas exchanger pipes, with the fume recovery manifold made from AISI 304L stainless steel with a low carbon content, to guarantee high resistance to condensation. Recovery pipes with a flat design, featuring grooves to increase turbulence, thereby improving the heat transfer coefficient, and subsequently reducing fuel consumption.
Selection of the operating mode: COOLING/HEATING. Selection of the setpoint. Continuous monitoring of operating parameters. Display of values measured by the sensors. Compressor time delays. Defrost management (on heat pump units). All-season operation using evaporation and condensation pressure monitoring. Control of the supply air temperature. Setpoint compensation based on the outdoor temperature. Hourly and weekly time schedule. Fire protection. Diagnostic of faults and general alarms.
Hermetic scroll compressors with acoustic insulation, fitted on anti-vibration mounts. Direction of rotation and phase balance control. Crankcase heater (heat pump units). Four-way reversal valve (heat pump units). Acid-resistant dehumidifier filters. Thermostatic expansion valves with external equaliser.
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A