AC-SVX002C-EN
49
Table 23.
Operating modes — chiller
Chiller Modes
Description
MP Resetting
Stopped
The chiller is not running either circuit, and cannot run without intervention, for instance to
place chiller into the “Auto Mode” or to clear a manual reset chiller level diagnostic.
Local Stop
Chiller is stopped by the AdaptiView Stop button command– cannot be remotely overridden.
Immediate Stop
Chiller is stopped by the AdaptiView Immediate Stop (by pressing the Stop then Immediate
Stop buttons in succession) – previous shutdown was manually commanded to shutdown
immediately.
Diagnostic Shutdown – Manual Reset
The chiller is stopped by a diagnostic that requires manual intervention to reset.
Software Service Lock
Software download is in progress from TU service tool
Run Inhibit
The chiller is currently being inhibited from starting (and running), but may be allowed to
start if the inhibiting or diagnostic condition is cleared.
Ice Building Is Complete
The chiller is inhibited from running as the Ice Building process has been normally
terminated on the evaporator entering temperature. The chiller will not start unless the ice
building command (hardwired input or Building Automation System command) is removed
or cycled.
Start Inhibited by BAS
Chiller is stopped by Tracer or other BAS system.
Start Inhibited by External Source
The chiller is inhibited from starting or running by the “external stop” hardwired input.
Start Inhibited by Local Schedule
The chiller is inhibited from starting or running by the Local Schedule.
Diagnostic Shutdown – Auto Reset
The entire chiller is stopped by a diagnostic that may automatically clear.
Waiting for BAS Communications
The chiller is inhibited because of lack of communication with the BAS. This is only valid 15
minutes after power up.
Start Inhibited by Low Ambient Temp
The chiller is inhibited based on the outdoor air temperature.This is a Chiller Level Mode
when the chiller is in Chilled Water Control
with Free Cooling not installed
Start Inhibited by Low Ambient Temp
The chiller is inhibited based on the outdoor air temperature.
This is a Chiller Level Mode
when the chiller is in Hot Water Control with Supplemental Heat not installed.
Start Inhibited by High Ambient Temp
The chiller is inhibited based on the outdoor air temperature.This is a Chiller Level Mode
when the chiller is in Hot Water Control
No Evaporator Water Pumps Available
On multiple pump units, pump faults and/or pump lockouts have been identified on each
pump, rendering the unit unable to run until the faults and/or lockouts are cleared.
Depending on the pump configuration and scenario in which this submode is used, it may
have a Run Inhibit or Stopped top level mode.
No Circuits Available
The entire chiller is stopped by circuit diagnostics or lockouts that may automatically clear.
Auto
The chiller is not currently running but can be expected to start at any moment given that the
proper conditions and interlocks are satisfied.
Waiting For Evaporator Water Flow
The chiller will wait a user adjustable time in this mode for evaporator water flow to be
established per the flow switch hardwired input.
Waiting For A Need To Cool
The chiller will wait indefinitely in this mode, for an evaporator leaving water temperature
higher than the Chilled Water Setpoint plus some control dead-band.
Waiting For A Need To Heat
For water cooled the chiller will wait indefinitely in this mode, for a condenser leaving water
temperature lower than the Hot Water Setpoint plus some control dead-band. For a
reversible unit, the chiller will wait indefinitely in this mode, for an evaporator leaving water
temperature lower than the Hot Water Setpoint plus some control dead-band.
Power-Up Delay Inhibit: MIN:SEC
On Power up, the chiller will wait for the Power-Up Delay Timer to expire. The associated
customer settable delay time, provides a means to “stagger” the start ups of multiple chillers
after a mains power restoration.
Waiting to Start
Generally a transient mode, this indicates the that a demand to run the chiller (cooling or
heating) has been established, and the first compressor start is imminent, pursuant to
sequential delays e.g. EXV pre-positioning.
