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Start-Up and Shutdown
Normal Shutdown to Stopped or Run Inhibit
The figure below shows the Transition from Running
through a Normal (friendly) Shutdown. The Dashed lines
Figure 46. Sequence of events: normal shutdown to stopped or run inhibit
Local Stop
Chiller Level Diagnostic – Normal Shutdown Latched
Chiller Level Diagnostic – Normal Shutdown Nonlatched
Building Automation System Stop
External Auto-Stop
6 1 / / 2/
/ /
/
2 2 / / 012 - 8/
/ /
Shutting Down
Running Circuit Modes: Shutting Down
One or
SubMode: Operational Pumpdown
More
Circuits
Operational Pumpdown
(See max allowed time below)
Running
Close EXV
(0 to 25 Seconds)
6/ 6 6 13/ 3 3 2012
Economizer – EEV and
port loader close
Fully Close EXV
No Pumpdown Required
IF*
Pumpdown
Perform Operational
Required
Pumpdown for All
Running Circuits if
Required
6/ 6 6 12/ 2 2 2012-12/ 2 2 11/ 1 2012
Check for
6 6 1
6/
/ /
/
1
1
1
1
5
5
5
5
5 /
/ /
/
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
Normal Pumpdown
Termination Criteria Met
68
Normal Pumpdown Termination
8 1 / / 5/
/ /
5 2 / / 012
/ /
Criteria is Met for All Circuits
r
r
8
8
i
i
a
a
a
a
a
a
a
a
/
/ /
1
5
5
i
i
s
s
s
s
s
s
s
s
s
s
/ /
/
Shutting Down
Circuit Modes:
*
Evaporator Pump Off Delay
(Adjustable 1 to 30 Minutes)
8/ 8 8 15/ 5 5 2012
Send Stop Command to
Running Compressors
Energize All Heaters
Fully Close Both EXVs
Turn Off All Running
Circuits Condenser Fans
*
Automatic Evaporator
Isolation Valve control
may close valve
2
2
0
0
12
* *
on the top attempt to show the final mode if you enter the
stop via various inputs.
* *
2
M
0
M
M
M
1
e
e
2
t
t
-
f
f
1
o
o
o
o
0 1
0
r
r
r
r
r
r
/ /
/
A
A
A
A
A
A
A
A
/
/ /
l l l
l
l
l
2
l
l
0
C
C
C
C
2
i
i
r
r
Stopped or Run Inhibit
Auto
10/ 0 0 17/ 7 7 2012
All
*
Operational Pumpdown is required if the Outdoor Air
Temperature is less than 50F, or the Entering Evaporator Water
Temperature is greater than (outdoor air temperature – 10°F). With
AFD, compressors will be at max speed for operational
pumpdown.
* * Operational Pumpdown: See Satisfied Setpoint Operational
Pumpdown sequence diagram for specific criteria
* * *
Automatic evaporator isolation valve control will close valve if
Outdoor Ambient Air Temperature at circuit shutdown is less than
evaporator leaving water cutout setpoint plus 3°C.
The maximum allowed time for Operational Pumpdown is: Max
pumpdown time =setting x number of compressors configured on
the circuit.
Note: If Free Cooling is active, the last stage of cooling to turn off
will be Free Cooling.
10/ 0 1 / / 6/ 6 6 2 / / 012 - 12/ 2 1 / / 1/2 / / 012
Circuit Modes:
Stopped or Auto
De-Energize Evaporator
Water Pump Relay
12/ 2 2 11/ 1 2012
RTAF-SVX001K-EN
Stopped
or
Run Inhibi
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