PACKAGED ROOFTOP UNITS
CARRIERrtc electronic control
The CARRIERrtc control is basically comprised of a μPC MEDIUM control board, a graphic terminal pGD1, a TCO user terminal (optional) and sensors. This system has a field-bus RS485 that allows the management of additional components. A BMS card allows the connection to a centralised technical management system. It also manages a local connection between units through a pLAN network (μPC MEDIUM Local Area Network), thus allowing communication of data and information for a maximum of 15 units. Auxiliary electrical heaters: one or two stages with on/ off control or a stage with proportional control. Hot water coil with 3-way valve, with proportional or on/off control. Gas burner with one or two stages of proportional control. Humidifier with proportional or on/off control. Air flow controller (with centrifugal fans). Clogged filter detector. Smoke detection station. Refrigerant leak detector. Air quality probe for measuring CO2 and/or volatile compounds. Energy meter.
pGD1 terminal: This terminal, installed on the electric panel, allows: - The initial programming of the unit. - The modification of operating parameters. - Unit ON / OFF. - The selection of the operating mode. - The setting of setpoints. - On-screen display of controlled variables and sensor values measured. - On-screen display of active alarms and historical record of alarms.
Main functions: - Selection of the operating mode: HEATING / COOLING. - Selection of the setpoint. - Permanent control of the operating parameters. - View of the values measured by the probes. - Timing of the compressors - Defrosting management (in heat pump units). - Operation of all the seasons via the condensation and evaporation pressure control. - Control of the outlet temperature. - Compensation of the setpoint based on the outdoor temperature. - Time and weekly schedule. - Anti-fire safety device. - Failure diagnosis and main alarm. Optional functions: This control allows controlling optional elements such as: - Outdoor air damper for renewing air, depending on the temperature of the mixing air or depending on the air quallity probe. - Mixing box for thermal, enthalpic or thermoenthalpic free-cooling. - Cooling recovery circuit for renewing the air.
C A R R I E R 2 0 1 6 / 2 0 1 7
TCO user terminal (optional): This terminal can be installed on the electric panel, instead of pGD1 terminal. In this case, the remote connection of the pGD1 terminal is posible. Please consult “Control options”. TCO terminal allows: - Unit ON / OFF. - The selection of the operating mode. - The setting of setpoints. - The display of temperatures and humidity of the installation, outdoor temperature, outlet air temperature, CO2 probe and opening of the outdoor damper. - On-screen display of alarms codes.