Installation and Maintenance Manual
Start-Up and Shutdown
RTAE-SVX001B-EN 65
Normal Shutdown to Stopped or Run Inhibit
Figure 61 shows theTransition 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.
Immediate Shutdown to Stopped or Run Inhibit
Figure 62 shows theTransition from Running through an
Immediate Shutdown. The dashed lines on the to attempt
to show the final mode if you enter the stop via various
inputs.
Figure 61. Sequence of events: normal shutdown to stopped or run inhibit
6
/
1
2
/
2
0
1
2
-
8
/
1
5
/
2
0
1
2
Shutting Down
Running Circuit Modes: Shutting Down
SubMode: Operational Pumpdown
*
8
/
1
5
/
2
0
1
2
1
2
/
1
1
/
2
0
1
2
6
/
1
3
/
2
0
1
2
Operational Pumpdown
(0 Seconds to 2 Minutes)
Fully Close EXV
Perform Operational
Pumpdown for All
Running Circuits if
Required
*
IF*
Close EXV
(0 to 25 Seconds)
2
2
0
0
1
2
6
/
1
2
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Check for
Normal Pumpdown
Termination Criteria Met
**
6
/
1
1
1
1
5
/
/
2
2
2
0
0
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
No Pumpdown Required
Pumpdown
Required
Evaporator Pump Off Delay
(Adjustable 1 to 30 Minutes)
Send Stop Command to
All
Running Compressors
Energize All Heaters
Fully Close Both EXVs
Turn Off All Running
Circuits Condenser Fans
De-Energize Evaporator
Water Pump Relay
Stop
p
o
r
Run I
n
One or
More
Circuits
Running
Normal Pumpdown Termination
**
Criteria is Met for All Circuits
Local Stop
Chiller Level Diagnostic – Normal Shutdown Latched
Chiller Level Diagnostic – Normal Shutdown Nonlatched
Building Automation System Stop
External Auto-Stop
8
r
r
i
i
/
a
a
1
a
a
5
i
i
s
s
/
s
s
2
s
s
0
M
M
M
M
2
e
e
-
t
t
1
f
f
o
o
0
o
o
/
r
r
1
r
r
A
A
/
A
A
l
l
2
l
l
l
l
0
C
C
C
C
2
C
C
i
i
Shutting Down
Circuit Modes:
Auto
0
/
1
6
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Stopped or Run Inhibit
Circuit Modes:
Stopped or Auto
1
0
/
1
7
/
2
0
1
2
2
*Note: Operational Pumpdown is required if the
Outdoor Air Temperature is less than 50°F.
**
Note: Operational Pumpdown is terminated
normally when the Evaporator Refrigerant Pressure
is at or below 20 psia.
The Maximum Allowed time for Operational Pumpdo
w
is 2 minutes.
Figure 62. Sequence of events: immediate shutdown to stopped or run inhibit
Chiller Level Diagnostic – Immediate Shutdown Non-Latching
Chiller Level Diagnostic – Immediate Shutdown Latching
Front Panel Immediate Shutdown
Run Inhibit
or
Stopped
Compressor Deceleration Time
De-Energize Evaporator
Water Pump Relay
9
/
2
9
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Stopped
6
6
6
/
/
/
1
1
1
2
2
2
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
9
9
9
/
/
/
2
2
2
9
9
9
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
Shutting Down
1
2
/
1
1
/
2
0
1
2
a
a
a
s
s
s
d
d
d
f
6
/
1
3
/
2
0
1
2
a
s
d
f
9
/
2
9
/
/
2
2
0
1
2
a
s
s
d
f
One or More
Running
Compressors
Send Stop Command to
All Running Compressors
Energize All Heaters
Fully Close Both EXVs
Turn Off All
Running Circuits
Condenser Fans