CDHH-SVX003C-EN
89
If the STOP key is pressed on the operator interface, the
chiller will follow the same stop sequence as described
earlier except the chilled water pump relay will also open
and stop the chilled water pump after the chilled water
pump delay timer has timed out after compressor shutdown
(refer to the following figure [normal shutdown to stopped
and run inhibit]).
If the immediate stop is initiated, a panic stop occurs which
follows the same stop sequence as pressing the STOP key
once, except the inlet guide vanes are not sequence-
closed and the compressor motor is immediately turned off.
Figure 63. Sequence of operation: normal shutdown to stopped and run inhibit
Local Stop
Normal Latching Diagnostic
Normal Non-Latching Diagnostic
Tracer Stop
External Auto-Stop
IGV Closed
Preparing Shutdown Shutting Down
Shutting Down
Running
Stopped
Run Inhibit
Stopped
or
Run Inhibit
Evap Pump
Off Delay
and Postlube
Complete
Close IGV (0–50 sec) Postlube 3 min
Evap Pump Off Delay Time
(0–30 min)
Command IGV Closed
Enforce All Running Mode Diagnostics
De-Energize Condenser
Water Pump Relay
De-Energize
Compressor
Confirm No Compressor Currents
Within 8 sec
Hold position of Oil Vent Line Valve
Open Oil Vent Line Valve
De-Energize Oil Pump
Confirm No Oil Pressure*
5 min after oil pump
is de-energized
De-Energize Evaporator
Water Pump Relay
*Note: No oil pressure is less than 3 psid (20.7 kPaD)
Power Up
“Software Operation Overview Diagram,” p. 86 includes an
illustration of Tracer
®
AdaptiView™ during a power up of
the controller. This process takes up to 15 seconds,
depending on the number of installed options.
Ice Building Control
The control panel provides a service level Enable or
Disable menu entry for the Ice Building feature when the
Ice Building option is installed. Ice Building can be entered
from Front Panel or, if hardware is specified, the control
panel will accept either an isolated contact closure 1K9
Terminals J2-1 and J2-2 (Ground) or a remote-
communicated input (BAS) to initiate the Ice Building mode
where the unit runs fully loaded at all times. Ice Building will
be terminated either by opening the contact or based on
entering evaporator fluid temperature. The control panel
will not permit the Ice Building mode to be entered again
until the unit is switched to the non-ice building mode and
back into the ice building mode. It is not acceptable to reset
the chilled water setpoint low to achieve a fully loaded
compressor. When entering Ice Building, the compressor
will be loaded at its maximum rate and when leaving Ice
Building, the compressor will be unloaded at its maximum
rate. While loading and unloading the compressor, all surge
detection will be ignored. While in the ice building mode,
demand limit setpoints less than the maximum will be
ignored. Ice Building can be terminated by one of the
following means:
• Front panel disable
• Opening the external ice contacts/remote-
communicated input (BAS)
• Satisfying an evaporator entering fluid temperature
setpoint (default is 27°F [-2.8°C])
• Surging for seven minutes at full open inlet guide vanes
(IGV)
Start-up and Shutdown
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