SINGLE-EFFECT HOT WATER-FIRED ABSORPTION CHILLERS
16LJ/16LJ-A
Features and advantages
Expert self-diagnosis function
Control system
8
Maintenance zone
at cooling water 27°C
Concentrated indicator
6
5
4
3
2
Figure 2 - Indication lights
Maintenance zone
at cooling water 31°C
8
Normal line
at cooling water 31°C
1
2
0
40
20
60
80
Cooling load factor (%)
100
7
8
9
4
10
Graph 3 - Vacuum condition monitoring
1.0
5
0.6
0
Notice
zone
Normal zone
20
0
60
80
100
Storage ratio (%)
Legend
1.
2.
3.
4.
5.
C
A
R
Storage tank
Diluted solution
Purge nozzle
Pd cell
Pressure sensor
R
I
E
R
3
Legend
Name
1.
Operation indication light
2.
Stop indication light
3.
Alarm indication light
4.
Remote/local select button with LED
5.
Operation select button with LED
6.
Data display
7.
Stand-by indication light
8.
Dilution indication light
9.
Safety circuit indication light
10. Power indication light
GL*. Purge indication light
43P*. Purge pump on-off switch
43ES*. Emergency stop switch
LED colour
Green
Orange
Red
Green
Green
7 segment LED (red)
Green
Green
Green
orange
CONTROLS
Pressure increase indicator
at storage tank
Maintenance zone
*On the control panel door, see p.16
2
0
1
6
/
2
0
1
7
AIR TREATMENT
Normal line
at cooling water 27°C
1
0
Display and control board
Abnormal stop zone
7
HEATING HEATING
Fouling factor
COOLING
■■ The Carrier control system surpasses other proportional
only control systems available today. The digital PID
(proportional plus integral plus derivative) control maximises
unit performance by maintaining a ±0.5 K variance in leaving
chilled-water temperature from the setpoint. Proportional
Predictive maintenance information
controls can typically only maintain a ±1 K variance from the
setpoint. The controller’s innovative design also incorporates
Graph 1 - Fouling of heat transfer tubes in cooling
the ability to start and stop the system chilled/hot and
water system
cooling water pumps. During shutdown these pumps are
sequenced to ensure a complete dilution cycle
■■ The leaving chilled-water temperature is measured every
8
Maintenance
five seconds and steam input is changed according to
line
the gradient of the leaving chilled-water temperature
6
curve. System temperatures, setpoints, and operational
Maintenance zone
records are displayed along with indicator lights for the
chiller and pumps.
4
Notice line
■■ The Carrier control system offers its users selfdiagnostics
by constantly monitoring the chiller status and will
2
automatically shut the chiller down if a fault occurs. The
Normal line
cause of shutdown will be retained in the memory and
0
can be displayed for immediate operator review. The
0
20
40
60
80
100
controller’s memory will also retain and display the cause
Cooling load factor (%)
of the last three system fault conditions. This method of
retaining fault conditions is extremely useful for maintaining
an accurate record of unit performance and fault history.
Graph 2 - Tend of absorbent concentration
he expert function is provided to monitor operating
T
conditions, predict chiller information and maintain stable
operation.
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