Trane RTAF-SVX001K-EN - Normal Shutdown to Stopped or Run Inhibit

Start-Up and Shutdown
68 RTAF-SVX001K-EN
Normal Shutdown to Stopped or Run Inhibit
The figure below shows the Transition from Running
through a Normal (friendly) Shutdown. The Dashed lines
on the top attempt to show the final mode if you enter the
stop via various inputs.
Figure 46. Sequence of events: normal shutdown to stopped or run inhibit
*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 beatmaxspeed for operational
pumpdown.
**Operational Pumpdown: See Satisfied Setpoint Operational
Pumpdown sequencediagramforspecific 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.
Themaximumallowed time for Operational Pumpdown is:Max
pumpdown time =setting x number of compressors configured on
the circuit.
Note:If Free Cooling is active,thelast stageof cooling to turn off
will be Free Cooling.
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6
1
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2
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2
2
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0
1
2
-
8
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8
1
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5
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5
2
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0
1
2
Shutting Down
Running Circuit Modes:Shutting Down
SubMode:Operational Pumpdown
*
8
/
8
8
1
5
/
5
5
2
0
1
2
1
2
/
2
2
1
1
/
1
2
0
1
2
6
/
66
1
3
/
33
2
0
1
2
Operational Pumpdown
(See max allowed time below)
Fully Close EXV
PerformOperational
PumpdownforAll
Running Circuits if
Required
*
IF *
Close EXV
(0to 25Seconds)
2
2
0
0
1
2
6
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66
1
2
/
22
2
0
1
2
-
1
2
/
22
1
1
/
1
2
0
1
2
Check for
Normal Pumpdown
Termination Criteria Met
**
6
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66
1
1
1
1
1
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5
5
5
5
/
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5
2
2
2
2
2
2
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0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
2
2
2
2
2
2
2
No Pumpdown Required
Pumpdown
Required
EvaporatorPump Off Delay
(Adjustable 1 to 30 Minutes)
Send Stop Command to
All
Running Compressors
EnergizeAll Heaters
Fully Close Both EXVs
Turn Off All Running
Circuits Condenser Fans
De-Energize Evaporator
Water Pump Relay
Stopped
or
Run Inhibi
One or
More
Circuits
Running
Normal Pumpdown Termination**
Criteria is Metfor All Circuits
Local Stop
Chiller Level Diagnostic – Normal Shutdown Latched
Chiller Level Diagnostic – Normal Shutdown Nonlatched
Building Automation SystemStop
External Auto-Stop
8
r
r
i
i
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aa
8
a
a
1
a
a
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a
a
5
i
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s
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s
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5
s
s
2
s
s
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s
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M
M
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M
M
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e
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t
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f
f
o
o
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o
o
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r
r
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1
r
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A
A
//
r
r
A
A
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AA
ll
A
A
2
l
l
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ll
ll
0
C
C
C
C
2
i
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r
r
Shutting Down
CircuitModes:
Auto
1
0
/
0
1
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6
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66
2
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0
1
2
-
1
2
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2
1
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1
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2
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0
1
2
Stopped or Run Inhibit
CircuitModes:
Stopped or Auto
1
0
/
00
1
7
/
77
2
0
1
2
Automatic Evaporator
Isolation Valve control
mayclose valve
Economizer–EEV and
port loader close