WATER-COOLED/CONDENSERLESS
LIQUID CHILLERS 30WG/30WGA 020-090
Pro-Dialog+ is a numerical control that combines intelligence
with operating simplicity. Depending on the options used, the
unit manages the operation of compressors, evaporaor and
condenser water pumps and fans (drycooler).
■■ Optimised energy management
-- A patented auto-adaptive algorithm optimises
the condensing pressure at part load to reduce
compressor load and ensure perfect supply for the
evaporator with liquid refrigerant. The algorithm
controls the operation of the variable-speed
condenser water pump and the fans (drycooler)
-- Pro-Dialog+ automatically resets the chilledwater temperature setpoint based on the outside
air temperature or the return water temperature.
The control can also operate on a second setpoint
(example: unoccupied mode).
Pro-Dialog+ interface
\\MAINMENU\STATUS
CAPB_T
DEM_LIM
SP
CTRL_PNT
EMSTOP
0
100
4.2
-28.9
dsable
%
%
°C
°C
Circuit B Total Capacity
START/STOP
ENTER
PRO-DIALOG+
■■ Ease-of-use
-- The Pro-Dialog+ interface includes five keys that
permit navigation via intuitive tree-structure menus.
Access to the information is very quick.
-- This new backlit LCD interface includes control by a
contrast potiometer for optimised visibility in all lighting
conditions.
-- The information is clearly displayed in English, French,
German, Italian and Spanish (for other languages
please consult Carrier Service).
-- The Pro-Dialog+ navigation uses intuitive treestructure menus, similar to the Internet navigators.
The menus are user-friendly and permit quick access
to the principal operating parameters: number of
compressors operating, suction/discharge pressure,
compressor operating hours, setpoint, temperatures.
■■ Remote control option
Pro-Dialog+ permits control and monitoring of the unit using
a wired interface:
-- Start/stop
-- Operating mode selection: cooling or heating
-- Demand limit
-- Dual setpoint
-- User safety loop.
The control remotely reports any problem.
COOLING
Pro-Dialog+ control
The CCN clock board connection offers other control
possibilities:
Two independent time schedules to control:
-- Unit start/stop
-- Operation at a second chilled-water setpoint (for
example: unoccupied mode)
-- Operation of two units in parallel (master/slave
function), and remote control via a communication
bus (RS 485 serial port).
HEATING HEATING
Controls
CONTROLS
AIR TREATMENT
■■ Total unit protection
-- A patented auto-adaptive algorithm controls
compressor operation and permanently adapts to the
system charac-teristics (water loop inertia). Dangerous
compressor cycling is prevented. The unit can operate
safely with a low water volume, and this frequently
makes a buffer tank unnecessary (see minimum water
volume later in this document).
-- Pro-Dialog+ permanently analyses the compressor
suction and discharge pressures and temperatures.
If an abnormal situation is detected, the control
reacts, e.g. by reducing the capacity. As a result the
compressors always operate in their ideal temperature
range and many unit shut-downs due to a fault can
be prevented.
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