Installation and Maintenance Manual
Start-Up and Shutdown
64 RTAE-SVX001B-EN
Satisfied Setpoint
Figure 60 shows the normal transition from Running to
shutting down due to the Evap Leaving water temp falling
below the differential to stop setpoint.
Figure 60. Sequence of events: satisfied setpoint
*
Note: Operational Pumpdown is required if the Outdoor Air Temperature is less than 50F.
**
Note: Operational Pumpdown is Terminated Normally when the Evaporator Refrigerant
Pressure is at or below 20 PSIA.
The Maximum Allowed Time for Operational Pumpdown is 2 Minutes.
8
/
1
0
/
2
0
1
2
-
1
0
/
1
3
/
2
0
1
2
Shutting Down
Last Circuit Mode: Shutting Down
SubMode: Operational Pumpdown
*
6
/
1
2
/
2
0
1
2
-
8
/
1
0
/
2
0
1
2
Running
Last Circuit Mode:
Running
1
0
/
1
3
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Auto
Both Circuit Modes:
Waiting for Need to Cool
8
/
1
1
/
2
0
1
2
6
/
1
3
/
2
0
1
2
Running
Last
Compressor
At Min Speed
1
0
/
1
4
/
2
0
1
2
Differential to Stop is Met
Operational Pumpdown
(0 Seconds to 2 Minutes)
Fully Close EXV
Perform Operational
Pumpdown for Last
Circuit if Required
*
Send Stop Command
To Compressor
IF*
No Pumpdown Required
Pumpdown
Required
Turn Off Last Circuit’s
Condenser Fans
Normal Pumpdown Termination
**
Criteria is Met for Last Circuit
6
6
6
6
6
/
/
/
/
/
/
1
1
1
1
1
2
2
2
2
2
/
/
/
/
/
/
2
2
2
2
2
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
-
-
1
1
1
1
1
2
2
2
2
2
/
/
/
/
/
/
1
1
1
1
1
1
1
1
1
1
/
/
/
/
/
/
2
2
2
2
2
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
Enforce All Non Running
Mode Diagnostics
6
/
1
1
1
1
5
/
2
2
2
0
0
0
0
0
0
0
1
1
1
1
1
E
2
2
2
2
2
E
n
1
2
/
1
1
/
2
0
1
2
Auto
Close EXV
(0 to 25 Seconds)
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
1
1
1
1
1
2
2
2
2
2
/
/
/
/
/
1
1
1
1
1
1
1
1
1
1
/
/
/
/
/
2
2
2
2
2
2
2
2
2
2
0
0
0
0
1
1
2
1
1
1
1
1
2
2
2
2
2
n
i
/
/
/
/
/
i
1
1
1
1
n
1
1
1
1
g
/
/
/
/
/
2
2
2
2
2
2
2
2
2
2
0
0
0
0
1
2
Energize Last Circuit
Oil Heaters