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Start-Up and Shutdown
Running (Lead Compr/Circuit Start - Run)
The figure below shows a typical start and run sequence
for the lead compressor and its circuit.
Figure 42. Sequence of operation: running (lead compressor/circuit start nd run)
Chiller and Lead Circuit
Mode is "Running" - Lag
Circuit Mode is "Auto"
6
6
6
6
6
6 6
/
/
/
/
/
/
/
/
/
/
1
1
1
2
2
2
2
2
2
/
/
/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
Running
Lead
Compressor
Running
Hold EXV Pre-position
(10 Seconds)
6/ 6 6 13/
3 3 2012
/
Hold EXV of Lead
Circuit at pre-
position for 10 sec
De-energize
Oil Heaters
Of Lead Circuit
Control Lead Circuit
Condenser Fans for
Optimum Differential
Pressure,
ƒ(Cprsr Spd, OA Temp)
6/
6 6 1
/
/
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
1
1
1
1
1
1
2
2
2
2
2
2
Enforce All Running Mode Diagnostics for Chiller, Lead Compressor and its Circuit
Milest s s on
n
n
n
n
n
e
e
e
e
D
D
D
D
D
D
D D D D
D
D
D
e
e
e
e
e
e e
e
e
e
s
s
s
s
s
s
s
s
s
s
c
c
c
c
r
r
r
r
i
i
i
i
i
p
p
p
p
p
p
p
p
p
p
t
t
t
t
i
i
i
i
i
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
Circuit X Lead: A compressor on the selected circuit will lead followed by a compressor on the alternate circuit, given an
appropriately increasing chiller load. Additional compressors will alternate between lead and lag circuits. Variable speed
compressors will always be the first compressors to start and last compressors to stop.
64
Enter
Limit Mode
8/
8 1 / / 4/
/ /
4 2 / / 012 - 9/
-
7
7
7
7
7
7
/
/
/
/
/
/
/
/
/
2
2
2
4
4
4
4
4
4
/
/
/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
7
7 2
7
7
7
7
/
/
/
/
/
/ /
/
/
/
/
/
/
/
2
2
2
2
3
3
3
3
3
3
/
/
/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
8
8
8
8
8
8
/
/
/
/
/
/
/
/
/
/
1
1
1
4
4
4
4
4
4
/
/
/
/
/
/
/
/
/
2
2
2
0
0
Running
Lead Circuit:
Running Limit
8/ 8 8 15/
5 5 2012
/
Modulate
Compressor
7/ 7 7 24
2 2 /
4 4 2012
/
for Limit
Control
Modulate EXV for
Pressure Control
Modulate Compressor
for
Capacity Control
Exit
Limit Mode
/ /
9 1 / / 1/
/ /
/ /
2 / / 012
Running
9
9
9
9
9
9
/
/
/
/
/
/
/
/
/
/
1
1
1
0
0
0
0
0
0
/
/
/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
1
1
1
0
0
0
0
0
0
Running
r
9 9
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
Stage On
Setpoint Met*
0 2 / / 8/
0/
/ /
8 2 / / 012 - 12/
/ /
2 1 / / 1/
/ /
Running
/
/
/
/
/
/
/
/
/
2
2
2
9
9
9
9
9
9
/
/
/
/
/
/
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
Lag Circuit:
Waiting to Start
EXV moving to preposition
0 to 25 Seconds
1
1
1
0
/ 0 0 29
0
0
2 2 / 9 9 2012
r
12/ 2 2 11
1
/ 1
/
2012
Condenser Fan Flow
Send Start Command
Pre-Position EXV of
to Lag Compressor
Lag Circuit
Prepare to Start
Lag Compressor,
Check for Oil,
Check for LPC
2 / / 012
/ /
Continue
Running
Start Control of
on Lag Circuit
RTAF-SVX001K-EN
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