PACKAGED ROOFTOP UNITS
50EN/EH 90-360
Controls
CARRIERrtc electronic control
-- 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.
■■ 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.
■■ 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.
C
A
R
R
I
E
R
2
0
1
6
/
2
0
1
7
CONTROLS
■■ 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.
AIR TREATMENT
■■ 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.
pLAN bus
pLAN bus
BMS bus
Field bus
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.
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