AIR-COOLED CONDENSING UNITS 38RBS
Remote Pro-Dialog+ interface
This interface can be installed up to 300 m away. It includes
a box that can be mounted inside the building. The power
supply is provided via a 220 V/24 V transformer supplied.
■■ Ease-of-use
-- Backlit LCD interface (option) includes a manual
control potentiometer to ensure legibility under any
lighting conditions.
-- The information is displayed clearly in English, French,
German, Italian and Spanish (for other languages
please consult Carrier)
-- The Pro-Dialog+ navigation uses intuitive treestructure menus, similar to the Internet navigators.
They are user-friendly and permit quick access
to the principal operat-ing parameters: number
of compressors operating, suction/discharge
pressure, compressor operating hours, setpoint, air
temperature.
Room temperature and supply air
temperature sensors for capacity
control (option)
■■ T
he room temperature sensor permits temperature
adjust-ment using a potentiometer.
■■ The supply air temperature sensor must be installed in the
air handling unit air flow to control the minimum supply
air temperature (adjustable via the remote Pro-Dialog+
interface.
Adustable room temperature sensor (option)
Pro-Dialog+ interface
Circuit B Total Capacity
PRO-DIALOG+
Features and advantages
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Easy and fast installation
■■ Physical features
-- Small unit footprint with a low height (1371 mm) for
easy installation in any application.
-- The unit is enclosed by easily removable panels, covering
all components (except air heat exchanger and fans).
■■ Simplified electrical connections
-- A single power supply point without neutral
-- Main disconnect switch (option 70) with high trip
capacity
■■ The control circuit of the 38RBS units is equipped with a
standard low-voltage transformer (24 V). This transformer
can also supply the other electrical components of the air
conditioning system: room thermostat and pumpdown
solenoid valves.
■■ Fast commissioning
-- Systematic factory operation test before shipment
-- Quick-test function for step-by-step verification of the
instruments, electrical components and motors.
Economical operation
■■ Increased energy efficiency at part load
The refrigerant circuit includes several compressors
connected in parallel. At part load, around 99% of the
operating time, only the compressors that are absolutely
necessary operate. At these conditions the compressors
operating are more energy efficient, as they use the total
condenser and evaporator capacity.
■■ Reduced maintenance costs
-- Maintenance-free scroll compressors
-- Fast diagnosis of possible incidents and their history
via the Pro-Dialog+ control
-- R410A refrigerant is easier to use than other
refrigerant blends
745
AIR TREATMENT
■■ Compressors
-- Low-noise scroll compressors with low vibration level
-- The compressor assembly is installed on an
independent chassis and supported by anti-vibration
moun tings
-- Dynamic suction and discharge piping support,
minimising vibration transmission (Carrier patent)
■■ Condenser section
-- Vertical condenser coils
-- Protection grilles on anti-vibration mountings to
protect the heat exchanger against possible shocks.
-- Low-noise latest-generation Flying Bird IV fans, made
of a composite material (Carrier patent) are now even
quieter and do not generate intrusive low-frequency
noise
-- Fan motor controlled by a variable-frequency
controller, to allow reduction of the fan speed, if the
extra low noise option 15LS is selected.
-- Rigid fan installation for reduced start-up noise
(Carrier patent)
■■ The refrigerant circuit includes all components for easy
connection to a direct-expansion air handling unit:
filter drier, moisture sight glass, high and low pressure
switch, as well as solenoid valves for pumpdown (to be
installed on the evaporator). All pipes and the refrigeration
components are welded. From size 38RBS 140 onwards,
two independent refrigerant circuits ensure partial cooling
capacity in all circumstances, and more flexible operation
at part load.
■■ Year-round operation
The 38RBS units are designed for year-round operation,
and operate without the use of accessories down to
-10°C. A control algorithm intelligently manages operation
of the fans. Option 28 allows stable unit operation at air
tempera-tures below -10°C and down to -20°C.
CONTROLS
Features