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Operator Interface Controls
Viewing Chiller Operating Modes
On the Reports screen, touch Chiller Operating Modes to view the current operating status of the
chiller in terms of the top-level operating mode and submodes.
Note: You can also access the Chiller Operating Modes screen from the chiller status button in
Figure 43. Chiller Operating Modes screen
Table 27. Operating Modes
Chiller Modes
MP Resetting
Stopped
Local Stop
immediate Stop
Diagnostic Shutdown – Manual Reset
Run Inhibit
Diagnostic Shutdown – Auto Reset
Starting is Inhibited by External Source
Start Inhibited by BAS
Waiting for BAS Communications
Power Up Delay Inhibit
Low Differential Refrigerant Pressure Cool-
Down Timemin:sec
Cool Down Restart Inhibit Time min:sec
Auto
Waiting For Evap Water Flow
Waiting for A Need to Cool
Waiting to Start
Waiting For Cond Water Flow
92
the upper left corner of the screen.
Description
The chiller is not running and cannot run without intervention. Further information
is provided by the sub-mode:
Chiller is stopped by TD7 Stop button command– cannot be remotely overridden.
Chiller is stopped by the TD7 Panic Stop (by pressing Stop button twice in succession) – pre-
vious shutdown was manually commanded to shutdown immediately without a run-unload or
pumpdown cycle - cannot be remotely overridden.
The chiller is stopped by a diagnostic that requires manual intervention to reset.
The chiller is currently being inhibited from starting (and running*), but may be
allowed to start if the inhibiting or diagnostic condition is cleared. Further infor-
mation is provided by the sub-mode:
The entire chiller is stopped by a diagnostic that may automatically clear.
The chiller is inhibited from starting (and running) by the "external stop" hardwired input.
The chiller is inhibited from starting (and running) by command from a Building Automation
System via the digital communication link (com 4 or com 5).
This is a transient mode - 15-min. max, and is only possible if the chiller is in the Auto -
Remote command mode. After a power up reset, it is necessary to wait for valid communi-
cation from a Building Automation System (Tracer) to know whether to run or stay inhibit-
ed. Either valid communication will be received from the Building Automation System (e.g.
Tracer), or a communication diagnostic ultimately will result. In the latter case the chiller will
revert to Local control.
min:sec
The compressor is currently being inhibited from starting as part of the power up start delay
(or staggered start) feature. This feature is intended to prevent multiple chillers from all
starting simultaneously if power is restored to all chillers simultaneously.
See
Oil Flow Protection (Spec Page 85)
The chiller is inhibited from running for a brief period of time if it is commanded shutdown
due high motor winding temp diagnostic.
The chiller is not currently running but can be expected to start at any moment
given that the proper conditions and interlocks are satisfied. Further information is
provided by the sub-mode:
The chiller will wait up to 20 minutes in this mode for evaporator water flow to be established
per the flow switch hardwired input.
The chiller will wait indefinitely in this mode, for an evaporator leaving water temperature
higher than the Chilled Water Setpoint plus the Differential to Start.
The chiller is not currently running and there is a call for cooling but start is de-
layed by certain interlocks or proofs. Further information is provided by the sub-
mode:
The chiller will wait up to 20 minutes in this mode for condenser water flow to be established
per the flow switch hardwired input.
RTHD-SVX04K-EN
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