Trane RTHD

RTHD-SVX01D-EN 91
Operator Interface Controls
Capacity Limited by Low Liquid Level
2
The circuit is experiencing low refrigerant liquid levels and the EXV
is at or near full open. The compressor will be unloaded to prevent
tripping.
Capacity Limited by High Current
2
The compressor is running and its capacity is being limited by high
currents. The current limit setting is 120% RLA (to avoid
overcurrent trips).
Capacity Limited by Phase Unbalance
2
The compressor is running and its capacity is being limited by
excessive phase current unbalance.
Note: Other normal running modes (see above) may also appear under this top level mode.
Shutting Down
1
The chiller is still running but shutdown is imminent. The chiller is
going through a compressor run-unload. sequence. Shutdown is
necessary due to one (or more) of the following sub-modes:
Local Stop
2
Chiller is in the process of being stopped by DynaView Stop button
command.
Panic Stop
2
Chiller is in the process of being stopped by DynaView Panic Stop
command.
Diagnostic Shutdown - Manual Reset
2
Chiller is in the process of being stopped by a Latching Diagnostic
shutdown - Manual Reset is required to clear.
Diagnostic Shutdown - Auto Reset
2
Chiller is in the process of being stopped by a Diagnostic shutdown
- Automatic clearing of the diagnostic is possible if condition clears.
Compressor Unloading
2
min:sec The compressor is in its "run - unload" state in which it is being
continuously unloaded for 40 sec prior to shutdown.
Start Inhibited by External Source
2
Chiller is in the process of being stopped by the External Stop
hardwired input.
Start Inhibited by BAS
2
The Chiller is in the process of shutdown due to a command from
the Building Automation System (e.g. Tracer).
Ice Building to Normal Transition
2
Chiller is in the process of being stopped by the transition from ice
to normal cooling mode with the removal of the ice making
command via the hardwired input or Building Automation System
(e.g. Tracer).
Ice Building is Complete
2
Chiller is in the process of being stopped as the Ice Building process
is being normally terminated on the return brine temperature.
Evap Pump Off Delay
2
min:sec
Service Override
1
The Chiller is in a Service Override mode
Service Pumpdown
2
The chiller, circuit, and compressor is running via a manual
command to perform a Service Pumpdown. Both evap and
condenser water pumps are commanded to run. The EXV is held
wide open, but the manual liquid line service valve should be
closed.
Table 18 Operating Modes
Chiller Modes Description
1 - Top Level Mode
2 - Sub Level Mode