Download Operation Manual 05/1998

Table 14. Menu 11, Chiller Sequencing
Scr
Line
Name (default values: bold italic)
Field
Range
Variable Name
1
1
Option= Automatic
1
Fixed
Automatic
Chiller Sequence Order Option
2
Control Type= Standard
1
Standard
Decoupled
Chiller Sequencing Control Type
1
Standby= NA {
1
NA, #1 – #12
Standby Chiller
2
On First= NA & Off Last |
1
NA, #1 – #12
First On Chiller
2
at Stage Two
Last
2
3
3
On Last= NA & Off First |
1
NA, #1 – #12
Last On Chiller
1
Resequence Day/Time= N/A 00:00
1
• N/A
Chiller Resequence Day/Time
• Sun – Sat
• Dly
• Hol
• Now }
2
4
5
Inhibit Stage-Up After 23:59
2
0 – 23
3
0 – 59
1
0 – 23
2
0 – 59
Inhibit Stage-Up After Time
3
Stage-Up Inhibit Setpoint= None
1
None
1 – 11
Stage-Up Inhibit Setpoint
1
Number Of Chillers= 3
1
1 – 12
Number Of Chillers
2
Number Of Stages= 3 ~
1
1 – 12
Number Of Chiller Stages
3
Stage-Up Differential= +1.0°F
(+0.5°C)
1
0.0 – 9.5°F
0.0 – 5.2°C 
Chiller Stage-Up Differential
1
Decoupler Temperature Diff=
+2.0°F (+1.1°C)
1
0.0 – 9.5°F
0.0 – 5.2°C 
Decoupler Stage-Up Temperature
Differential
2
Decoupler Flow Factor= 1.10
1
0.75 – 1.50
Decoupler Stage-Down Flow Rate
Factor
SWITCH Key Destination: Menu 3. Chiller Status
Notes:
1. If a standby chiller is designated, it is automatically placed only in the highest stage (menu 13) regardless of the Chiller Sequence
Order Option setting. If the Chiller Sequence Order Option is set to “Automatic,” the Last On Chiller variable is automatically set
equal to the Standby Chiller variable.
2. The First On Chiller and Last On Chiller variables have meaning only when the Chiller Sequence Order Option is set to
“Automatic.” The controller does not allow the same chiller to be designated both first on and last on.
3. The “Now” selection automatically changes to “N/A” after the resequence day/time function is executed.
4. The Number Of Chiller Stages variable is adjustable only when the Chiller Sequence Order Option is set to “Fixed.” If the Chiller
Sequence Order Option is set to “Automatic,” the Number Of Chiller Stages variable is automatically set equal to the Number Of
Chillers variable.
5. Program CSC1S01 > only.
Table 15. Menu 12, Chiller Staging Factors
Scr
Line
Name (default values: bold italic)
Field
1
1
Stage 1:
(screen name)
2
Stage-Up Load= 95%
1
NA, 1 – 99%
Stage-Dn Load= NA% {
–
–
–
Time Delay= 5 Min
1
2 – 60 Min
Chiller Stage 1 Delay Time
Max Tower Stage= 1
1
NA, 1 – 12
Chiller Stage 1 Max Tower Stage
1
Stage 2:
(screen name)
2
Stage-Up Load= 95%
1
NA, 1 – 99%
Chiller Stage 2 Stage-Up Setpoint
Stage-Dn Load= 50%
1
NA, 1 – 99%
Chiller Stage 2 Stage-Down
Setpoint
3
2
26
Range
Variable Name
Chiller Stage 1 Stage-Up Setpoint
OM127-1