Trane RTAF-SVX001K-EN - Satisfied Setpoint

Start-Up and Shutdown
66 RTAF-SVX001K-EN
Satisfied Setpoint
The figure below shows the normal transition from
Running to shutting down due to the Evap Leaving water
temp falling below the differential to stop setpoint.
Figure 44. Sequence of events: satisfied setpoint
*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 atmax speed for operational pumpdown.
** Operational pumpdown is terminated normallyin the following configurations when:
Water with 2-Pass Evaporator:
-The evaporator (suction)pressure is at or below the “Pumpdown Termination Pressure” setting OR
LERTC saturated pressure (28.6F), which ever is greater
-The condenser (compressordischarge)pressureexceeds 315psia.
-The compressorpressure ratio exceeds 8.
-The system differential pressure exceeds 265psid or <25min.
Glycol with 2-Pass Evaporator:
Theevaporator (suction)pressure is at or below the “Pumpdown Termination Pressure” setting OR
LERTC saturated pressure (per guidance -5F minimum), which ever is greater
-The condenser (compressordischarge)pressureexceeds 315psia.
-The compressorpressure ratio exceeds 8.
-The system differential pressure exceeds 265psid or <25min.
Water with SinglePass Evaporator:
-The evaporator (suction)pressure is at or below the “Pumpdown Termination Pressure” setting OR
LERTC saturated pressure (32F), which ever is greater
-The condenser (compressordischarge)pressureexceeds 315psia.
-The compressorpressure ratio exceeds 12.3
-The system differential pressure exceeds 265psid.
Glycol with Single Pass Evaporator:
-The evaporator (suction)pressure is at or below the “Pumpdown Termination Pressure” setting OR
LERTC saturated pressure (per guidance -5F minimum), which ever is greater
-The condenser (compressordischarge)pressureexceeds 315psia.
-The compressorpressure ratio exceeds 12.3
-The system differential pressure exceeds 265psid.
Themaximumallowed time forOperational Pumpdown is Max Pumpdown Timesetting (default to 120
sec.)*number of compressors configured on the circuit.
***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.
****If Condenser Refrigerant Tanks are installed
8
/
/
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8
1
/
/
0
/
/
/
0
2
//
0
1
2
-
1
0
/
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0
1
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3
/
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3
2
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/
0
1
2
Shutting Down
Last Circuit Mode: Shutting Down
SubMode:Operational Pumpdown
*
6
/
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6
1
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/
2
/
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/
/
2
2
/
/
0
1
2
-
8
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8
1
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0
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/
0
2
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0
1
2
Running
LastCircuitMode:
Running
1
0
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0
1
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3
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3
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
12
Auto
Both CircuitModes:
Waiting for Need to Cool
8
/
88
1
1
/
1
2
0
1
2
6
/
6
6
1
3
/
33
2
0
1
2
Running
Last
Compressor
AtMin
Capacity
1
0
/
00
1
4
/
44
2
0
1
2
DifferentialtoStopisMet
Operational Pumpdown
(See max time allowed below)
FullyCloseEXV
Close Condenser
RfgtTank Solenoid
Valve****
Send Stop Command
To Compressor(s)
IF *
No Pumpdown Required
Pumpdown
Required
Turn Off Last Circuit’s
Condenser Fans
Normal Pumpdown Termination**
Criteria is Metfor Last Circuit
6
6
6
6
6
6
6
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6
6
6
6
6
6
6
6
6
1
1
1
1
1
1
2
2
2
2
2
2
/
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2
2
22
2
2
2
2
2
2
2
2
2
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
-
-
-
1
1
1
1
1
1
2
2
2
2
2
2
/
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2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
/
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/
/
/
/
/
1
1
1
1
1
1
2
2
2
2
2
2
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
Enforce All Non Running
Mode Diagnostics
6
/
6
1
1
1
1
1
1
/
/
5
5
5
5
5
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5
5
5
5
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
E
2
2
2
2
2
2
2
E
n
1
2
/
22
1
1
/
1
2
0
1
2
Auto
Close EXV
(0 to 25 Seconds)
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
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2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
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1
1
1
1
1
1
1
1
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2
2
2
2
2
2
2
2
2
2
2
2
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//
0
0
1
2
1
1
1
1
1
1
1
n
n
2
2
2
2
2
2
2
n
i
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i
n
2
2
2
2
i
1
1
1
1
1
1
1
n
g
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n
1
1
1
1
1
1
1
g
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2
2
2
2
2
2
2
2
2
2
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0
0
0
1
2
EnergizeLast Circuit
Oil Heaters
6
/
66
1
1
1
1
/
/
3
3
3
3
3
3
3
/
/
/
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3
3
3
3
2
2
2
2
2
/
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/
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
6
/
66
1
2
/
2
2
2
0
1
2
-
1
2
/
22
1
0
/
00
2
0
1
2
Checkfor
Normal Pumpdown
Termination CriteriaMet
**
***Automatic Evaporator
Isolation Valve control may
closevalve
PerformOperational
Pumpdown forLast
Circuit if Required