Controls Interface
114 RTAC-SVX01J-EN
Start Inhibited by BAS
The circuit is in the process of shutdown due to a command from the Building
Automation System (e.g. Tracer)
Service Override The given circuit is in a Service Override mode
Service Pumpdown
The circuit is running with fan control, via a manual command to perform a
Service Pumpdown. Its respective EXV is being held wide open, but the manual
liquid line service valve should be closed.
Table 55. Circuit modes (continued)
Circuit Modes Description
Top Level Mode
Sub-modes
Table 56. Compressor modes
Compressor Modes Description
Top Level Mode
Sub-modes
Stopped
The given compressor is not running and cannot run without intervention. Further
information is provided by the sub-mode:
Diagnostic Shutdown - Manual Reset The compressor has been shutdown on a latching diagnostic.
Service Tool Lockout
The compressor has been shutdown due to a command from the TechView Service Tool
to be "locked out" and inoperative. This setting is nonvolatile and operation can only be
restored by using TechView to "unlock" it.
Other sub-modes are possible in conjunction with at least one of the above modes - See items below for their descriptions:
Diagnostic Shutdown - Auto Reset
Restart Inhibit
Run Inhibit
The given compressor is currently being inhibited from starting (and running*), but may
be allowed to start if the inhibiting or diagnostic condition is cleared. Further information
is provided by the sub-mode:
Diagnostic Shutdown - Auto Reset The compressor has been shutdown on a diagnostic that may clear automatically.
Restart Inhibit
The compressor is currently unable to start due to its restart inhibit timer. A given
compressor is not allowed to start until 5 minutes has expired since its last start.
Auto
The given compressor is not currently running but can be expected to start at any moment
given that the proper conditions occur.
No Sub Modes
Starting
The given compressor is going through the necessary steps to allow it to start. (This mode
is short and transitory)
No Sub Modes
Running
The given compressor is currently running. Further information is provided by the sub-
mode:
Establishing Min. Capacity - High Oil Temp
The compressor is running and is being forced loaded to its step load point, without regard
to the leaving water temperature control, to prevent tripping on high oil temperature.
Running - Limited
The given compressor is currently running, but its capacity is being actively limited by the
controls. Further information is provided by the sub-mode:
Capacity Limited by High Current
The compressor is running and its capacity is being limited by high currents. The current
limit setting is 120% RLA (to avoid overcurrent trips) or lower as set by the compressor's
"share" of the active current limit (demand limit) setting for the entire chiller.
Capacity Limited by Phase Unbalance
The compressor is running and its capacity is being limited by excessive phase current
unbalance.
Shutting Down
The given compressor is still running but shutdown is imminent. The compressor is going
through either a run-unload mode or is the active compressor in the operational
pumpdown cycle for its circuit. Shutdown is either normal (no sub-mode displayed) or due
the following sub-modes:
Diagnostic Shutdown - Manual Reset The compressor is in the process of shutdown due to a latching diagnostic.
Diagnostic Shutdown - Auto Reset
The compressor is in the process of shutdown due to a diagnostic that may clear
automatically.
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