Controls Interface
RTAC-SVX01J-EN 11 3
Table 55. Circuit modes
Circuit Modes Description
Top Level Mode
Sub-modes
Stopped
The given circuit is not running and cannot run without intervention. Further
information is provided by the sub-mode:
Front Panel Lockout
The circuit is manually locked out by the circuit lockout setting - the nonvolatile
lockout setting is accessible through either the DynaView or TechView.
Diagnostic Shutdown - Manual Reset The circuit has been shutdown on a latching diagnostic.
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
Start Inhibited by External Source
Start Inhibited by BAS
Run Inhibit
The given circuit 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 circuit has been shutdown on a diagnostic that may clear automatically.
Start Inhibited by External Source
The circuit is inhibited from starting (and running) by its "external circuit lockout"
hardwired input.
Start Inhibited by BAS
The circuit is inhibited from starting (and running) by command from a Building
Automation System via the digital communication link (com 3 or com 5).
Auto
The given circuit is not currently running but can be expected to start at any
moment given that the proper conditions and interlocks are satisfied.
No Sub Modes
Starting
The given circuit is going through the necessary steps to allow the lead
compressor on that circuit to start.
No Sub Modes
Running
At least one compressor on the given circuit is currently running. Further
information is provided by the sub-mode:
Establishing Min. Cap - Low Diff pressure
Circuit is experiencing low system differential pressure and is being force loaded,
regardless of Chilled Water Temperature Control, to develop pressure sooner.
Running - Limited
At least one compressor on the given circuit is currently running, but the capacity
of the circuit is being actively limited by the controls. Further information is
provided by the sub-mode:
Capacity Limited by High Cond Press
Circuit is experiencing condenser pressures at or near the condenser limit
setting. Compressors on circuit will be unloaded to prevent exceeding limits.
Capacity Limited by Low Evap Rfgt Temp
The circuit is experiencing saturated evaporator temperatures at or near the Low
Refrigerant Temperature Cutout setting. Compressors on the circuit will be
unloaded to prevent tripping.
Capacity Limited by Low Liquid Level
The circuit is experiencing low refrigerant liquid levels and the EXV is at or near
full open. The compressors on the circuit will be unloaded to prevent tripping.
Shutting Down
The given circuit is still running but shutdown is imminent. The circuit is going
through either a compressor run-unload mode or a circuit operational pumpdown
to dry out the evaporator (cold OA ambient only). Shutdown is necessary due
to one (or more) of the following sub-modes:
Operational Pumpdown
The circuit is in the process shutting down by performing an operational
pumpdown just prior to stopping the last running compressor. The EXV is
commanded closed. Pumpdown will terminate when both the liquid level and the
evap pressure
Front Panel Lockout
The circuit has been manually locked out by the circuit lockout setting and is in
the process of shutting down - the nonvolatile lockout setting is accessible
through either the DynaView or TechView.
Diagnostic Shutdown - Manual Reset The circuit is in the process of shutdown due to a latching diagnostic.
Diagnostic Shutdown - Auto Reset
The circuit is in the process of shutdown due to a diagnostic that may
automatically clear.
Start Inhibited by External Source
The circuit is in the process of shutdown due to a command from the external
circuit lockout hardwired input.
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