WATER-COOLED/CONDENSERLESS
LIQUID CHILLERS 30WG/30WGA 020-090
30WG/30WGA units compatible
the Carrier 09 series drycoolers/
remote condensers
COOLING
The Carrier 09 series drycoolers and remote condensers are
compatible with the 30WG and 30WGA units.
A dedicated control board for installation in the drycooler/
remote condenser control box is available as an option
(option 154). It controls the fans via digital or analogue
outputs, depending the fan motor used.
Control board algorithms optimise energy consumption
based on:
-- The outside temperature and chilled-water
temperature read for drycoolers
-- The outside temperature and saturated refrigerant
discharge temperature read for remote condensers.
A simple communication bus is required downstream to
connect the control board to the unit control.
As all control components are installed and tested in the
factory, installation and start-up of the unit and its associated
drycooler/remote condenser are simplified.
30WG system concept
Water loop
user side
Water loop
source side
Variable- or
Fan
speed fans**
steps (1
(0-10 V)
to 8)
Three-way valve
Control board
option 154*
30WG
30WG
OAT
Drycooler leaving
water temperature
Not compatible with variablespeed pump control
Variable or fixedspeed pump
CCN LEN bus
Reset value
% Building load
Weather compensation curve
Legend
CCN Carrier Comfort Network
LEN Local equipment network
OAT Outside air temperature
*
Option 154: if requested, the control board is supplied with
the unit, for installation in the drycooler
**
For correct operation of the unit below 0 °C variable-speed
fans are required.
Outdoor temperature (OAT)
Heat exchanger delta T
30WGA system concept
Water loop
user side
30WGA
Variablespeed fans** or
(0-10 V)
Control board
option 154*
Refrigerant to/from
30WGA
Fan
steps
(1 to 8)
OAT
Variable or
fixed-speed30WGA
pump
CCN LEN bus
Reset value
% Building load
Weather compensation curve +
sensor (included)
Legend
CCN Carrier Comfort Network
LEN Local equipment network
OAT Outside air temperature
*
Option 154: if requested