54
AC-SVX001A-EN
Table 19.
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.
No Circuits Available
The entire chiller is stopped by circuit diagnostics or lockouts.
Diagnostic Shutdown - Manual Reset
The chiller is stopped by a Chiller Level diagnostic that requires manual intervention to reset.
Power Up Delay Inhibit: min:sec
On Power up, the chiller will wait for the Power Up Delay Timer to expire.
Run Inhibit
The chiller is currently being inhibited from starting (and running), but may be allowed to
start if the chiller inhibit or the Chiller or Circuit level (effecting both circuits) diagnostic
conditions are manually or automatically cleared.
No Circuits Available
The entire chiller is stopped by circuit diagnostics or lockouts that may automatically clear.
Software Service Lock
TU service tool invoked chiller lockout to prevent operation of the chiller during certain
procedures, such as configuration or binding
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.
Ice to Normal Transition
The chiller is inhibited from running for a brief period of time if it is commanded from active
ice building mode into normal cooling mode via the ice building hardwired input or Tracer.
This allows time for the external system load to “switchover” from an ice bank to the chilled
water loop, and provides for a controlled pull down of the loop’s warmer temperature. This
mode is not seen if the ice making is automatically terminated on return brine temperature
per the mode below.
Start(ing is) Inhibited by BAS (Building
Automation System)*
Chiller is stopped by Tracer or other BAS system per BAS communicated commands or
(depending on configuration and settings) by lack of communication with the BAS system.
Start(ing is) Inhibited by External Source
The chiller is inhibited from starting or running by the “external stop” hardwired input.
Diagnostic Shutdown - Auto Reset
The entire chiller is stopped by a diagnostic that may automatically clear. The chiller is
stopped by a Chiller Level diagnostic that may be reset automatically depending on
conditions and the specific diagnostic’s reset criteria.
Start(ing is) Inhibited by Low Ambient Temp
(erature)
The chiller is inhibited based on the outdoor air temperature.
Power Up Delay Inhibit: min:sec
On Power up, the chiller will wait for the Power Up Delay Timer to expire.
Maximum Capacity
Because the chiller is unable to run, when the chiller is in a Top Level Run Inhibit mode, the
maximum capacity submode simply echoes that there is no additional capacity available at
this time, unless the cause of the inhibit is removed.
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 Evap(orator) Water Flow
The unit will wait up to 20 minutes in this mode for 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 a leaving water temperature higher than the
Chilled Water Setpoint plus some control dead-band.
Waiting to Start
The chiller is not currently running and there is a call for cooling but the lead circuit start is
delayed by certain interlocks or proofs. Further information is provided by the sub-mode:
Summary of Contents for Ascend ACR Series
Page 110: ...110 AC SVX001A EN N No ot te es s...
Page 111: ...AC SVX001A EN 111 N No ot te es s...
