39
Range of Values is 40 to 90°F (4.4 to 32.2°C) in increments
of 1 or 0.1°F or C depending on the Service Setup Screen
xxx or xxx.x. Module Default is 70°F (21.1°C).
Evaporator Leaving Water Control
See Table 5 for initial settings for items 15,16,17 and 18.
Table 5. Evaporator leaving water control settings
Item
ABDA
ABSD
ABTF
15
Gain
80
40
80
16
Reset
200
250
200
17
Derivative
0
0
0
18
20
15
20
15. Chilled Water Control Gain Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 500. (See also control system PID and
limit). (See Table 5).
16. Chilled Water Control Reset Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 200. (See above Table 5).
(See also control system PID and limit).
17. Chilled Water Control Derivative Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 0. (See above Table 5).
(See also control system PID and limit)
18. Evaporator Time Constant
This is a number that reflects the estimated time it takes for
chiller water to pass through the system loop piping. This
value will change slightly with each machine installation.
The Range of Valves is 0 to 600 in increments of 1. The
module Default is 100. (See above Table 5).
Concentration Control
19. LTHX Crystallization Temperature Margin Setpoint
This selection determines how close to solution
crystallization the machine can operate. Range of Values is
0 to 30°F (0 to 16.6°C) in increments of 1 or 0.1°F or C
depending on the Service Setup Screen xxx or xxx.x.
Module default is 15°F.
(See Also Low Temperature Heat Exchanger (LTHX) Margin
Control)
See Table 5A for initial settings for items 20, 21, 22, & 25.
Table 5A. Concentration control setpoints
Item
Conc
ABDA
ABSD
ABTF
20
Prop.
150
180
250
Gain
21
Reset
250
350
400
22
Derivative
400
20
300
25
20
20
20
Evaporator
Time
Constant
Generator
Time
Constant
20. Concentration Control Gain Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 500. (See above Table 5A). (See also
control system PID and limit).
21. Concentration Control Reset Gain Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 200. (See above Table 5A). (See also
control system PID and limit).
22. Concentration Control Derivative Setpoint
The Range of Valves is 0 to 1000 in increments of 1. The
module Default is 0. (See above Table 5A). (See also control
system PID and limit).
23. Concentration Offset Generator Number 1 Setpoint
Used to calibrate the calculated strong concentration
reading to the actual strong solution sampled. This
adjustment corrects for any CLD readout error.
The Range of Valves is 0.0 to 100.0 in increments of 0.1. The
module Default is 0.0.
24. Concentration Offset Generator Number 2 Setpoint
Used to calibrate/match the control system calculated
intermediate concentration reading to the actual strong
solution sampled and measured at machine startup or
service inspection. This adjustment allows for any reading
error from tolerance summation to be offset.
The Range of Valves is 0.0 to 100.0 in increments of 0.1. The
module Default is 0.0.
25. Generator Time Constant Setpoint
This is a number that reflects the derived time it takes for
lithium bromide to pass through the generator. This
number is factory set and should not require field
adjustment. The Range of Valves is 0 to 100 in increments
of 1. The Module Default is 30.
Leaving Water
Temperature