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Running (Lag Compressor/Circuit Start and Run)
The figure below shows a typical start and run sequence
for the lag compressor and its circuit.
Figure 7.
Sequence of operation: running (lag compressor/circuit start nd run)
Chiller and Both Circuit
Modes are "Running"
6
6
6
6
6
6
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/
1
1
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2
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2
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0
0
0
1
1
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2
All
Running
Compressors
Running
Modulate EXV for
Pressure Control
6/ 6 6 13/
3 3 2012
/
Modulate
Compressor for
Capacity Control
De-energize
Oil Heaters
Of Lag Circuit
Control Both Circuit
Condenser Fans for
Optimum Differential
Pressure,
ƒ(Cprsr Spd, OA Temp)
6 6 1
6/
/
/
1
1
1
1
1
3
3
3
3 3
3
3
3
3
/
/
/
/
2
2
2
2
2
2
2 2
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
2
2
2
2
2
2
2
Milest s s on
n
n
n
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n
e
e
e
e
D
D
D
D
D
D
D
D
D
D D D D
D
e
e
e
e
e
e
e
e
e
e
e
s
s
s
s
s
s
s
s
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s
c
c
c
c
r
r
r
r
i
i
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i
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p
p
p
p
p
p
p
p
p
p
t
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t
t
t
i
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i
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o
o
o
o
n
n
n
n
*
Note: The decision to stage on or off another compressor is determined by
the Average Running Compressor Load Command, Water Temperature Error, and Time Since Last Stage
RTAF-SVX002D-EN
Enter
Limit Mode
8 1 / / 3/
/ /
/
3 2 / / 012 - 9/
/ /
Running
-
7
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7
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2
2
2
4
4
4
4
4
4
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/
2
2
2
0
0
0
1
1
1
2
2
2
7 2
7
7
7
7
7
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/
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/
/ /
/
/
/
/
/
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2
2
2
2
3
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3
3
3
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/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
8
8
8
8
8
8
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/
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/
1
1
1
4
4
4
4
4
4
/
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/
/
/
/
/
2
2
2
Running
Lag Circuit:
Running Limit
7/ 7 7 24
2 2 / 4 4 2012
8/ 8 8 13/
3 3 2012
/
Modulate
Compressor
for Limit
Control
Enforce All Running Mode Diagnostics for Chiller, Lead Compressor and its Circuit
Exit
Limit Mode
9 1 / / 1/
/ /
/ /
2 / / 0
0 0
1
1
2
9
9
9
9
9
9
/
/
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/
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/
1
1
1
1
1
1
/
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/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
1
1
1
0
0
0
0
0
0
/
/
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/
3
3
3
0
0
0
0
0
0
/
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/
/
/
/
/
/
/
2
2
2
Running
9/ 9 9 11/
1 2012
/
Modulate Compressor
for
Capacity Control
6 6
6
6 6 6 6
6 6
/
/
/
/
1
1 1
2
2 2
2 2 2 2
2 2
/
/
/
/
2 2
2
0
0 0
1
1 1
2 2
2
-1
1 1
2 2
2 2 2 2
2 2
2
/
/
/
/
1 1
1
1
1 1
1
1 1
/
/
/
/
2
2 2
0
0 0
1 1
1
2
2 2
Start-Up and Shutdown
All Compressors Running
At or Near Max Capacity
(Unable to Achieve CWSP)
0
0
0
1
1
1
2
2
2
1
1
1
0
0
0
0
0
0
0
0
/
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2
2
2
8
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0
0
0
0
1
1
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2
-
1
1
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1
1
1
1
1
1
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2
2
2
0
0
0
0
1
1
1
2
2
2
Running
Energize Maximum
1
1
1
0
0
0 0
0
0
0
/
/
/
30
0
/ 0 0
/
2012
2
2
or
r
Capacity Relay after the
Adjustable Filter Time
(0 to 1500 Seconds)
Maximum Capacity
Submode
Continue
Running
(All
Cprsrs &
Max
Capacity
17
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