Control Test - Carrier 19XR Start-Up, Operation And Maintenance Instructions Manual

These maintenance screens are very useful in helping to
determine how the control temperature is calculated and guide
vane positioned and for observing the reactions from load
changes, control point overrides, hot gas bypass, surge pre-
vention, etc. The tables are:
CAPACITY Capacity
Control
OVERRIDE Override
Status
HEAT_EX Surge/
HGBP
Status
LL_MAINT LEAD/LAG
Status
OCCDEFCM Time
Schedules
Status
WSMDEFME Water
System
Manager
Status
A. MANUAL STOP
PRIMARY MESSAGE
MANUALLY STOPPED — PRESS CCN OR LOCAL TO START
TERMINATE PUMPDOWN MODE TO SELECT CCN OR LOCAL
SHUTDOWN IN PROGRESS
SHUTDOWN IN PROGRESS
ICE BUILD
B. READY TO START
PRIMARY MESSAGE
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START IN XX MIN
READY TO START
READY TO START
READY TO START
READY TO START
READY TO START
READY TO START
STARTUP INHIBITED
This table shows all values
used to calculate the chilled
water/brine control point.
Details of all chilled water con-
trol override values.
The surge and hot gas bypass
control algorithm status is
viewed from this screen. All
values dealing with this control
are displayed.
Indicates LEAD/LAG operation
status.
The Local and CCN occupied
schedules are displayed here
to help the operator quickly de-
termine whether the schedule
is in the occupied mode or
not.
The water system manager is a
CCN module that can turn on
the chiller and change the
chilled water control point. This
screen indicates the status of
this system.
Table 8 — CVC Primary and Secondary Messages and
Custom Alarm/Alert Messages with Troubleshooting Guides
SECONDARY MESSAGE
COMPRESSOR UNLOADING
COMPRESSOR DEENERGIZED Chiller compressor is being commanded to stop. Water pumps are
OPERATION COMPLETE
SECONDARY MESSAGE
UNOCCUPIED MODE
REMOTE CONTACTS OPEN
STOP COMMAND IN EFFECT
OCCUPIED MODE
REMOTE CONTACTS CLOSED
START COMMAND IN EFFECT
RECYCLE RESTART PENDING
UNOCCUPIED MODE
REMOTE CONTACTS OPEN
STOP COMMAND IN EFFECT
OCCUPIED MODE
REMOTE CONTACTS CLOSED
START COMMAND IN EFFECT
LOADSHED IN EFFECT
Control Test —
The Control Test feature can check all
the thermistor temperature sensors, pressure transducers, pumps
and their associated flow devices, the guide vane actuator,
and other control outputs such as hot gas bypass. The tests
can help to determine whether a switch is defective or a pump
relay is not operating, as well as other useful troubleshoot-
ing issues. During pumpdown operations, the pumps are en-
ergized to prevent freeze-up and the vessel pressures and
temperatures are displayed. The Pumpdown/Lockout fea-
ture prevents compressor start-up when there is no refrig-
erant in the chiller or if the vessels are isolated. The Termi-
nate Lockout feature ends the Pumpdown/Lockout after the
pumpdown procedure is reversed and refrigerant is added.
LEGEND TO TABLES 8A - 8J
CCM — Chiller Control Module
CVC — Chiller Visual Control
CHW — Chilled Water
ISM — Integrated Starter Module
PIC II — Product Integrated Control II
VFD — Variable Frequency Drive
PROBABLE CAUSE/REMEDY
PIC II in OFF mode, press CCN or LOCAL softkey to start unit.
Enter the CONTROL TEST table and select TERMINATE LOCKOUT to
unlock compressor.
Chiller unloading before shutdown due to soft/stop feature.
deenergized within one minute.
Chiller shutdown from Ice Build operation.
PROBABLE CAUSE/REMEDY
Time schedule for PIC II is unoccupied. Chillers will start only when
occupied.
Remote contacts are open. Close contacts to start.
Chiller START/STOP on MAINSTAT manually forced to stop. Release
point to start.
Chiller timer counting down. Unit ready to start.
Chiller timer counting down. Unit ready to start. Remote contact enabled
and closed.
Chiller START/STOP on MAINSTAT manually forced to start. Release
value to start under normal control.
Chiller in recycle mode.
Time schedule for PIC II is unoccupied. Chiller will start when occupied.
Make sure the time and date are correct. Change values in TIME AND
DATE screen.
Remote contacts have stopped the chiller. Close contacts to start.
Chiller START/STOP on MAINSTAT manually forced to stop. Release
point to start.
Chiller timers complete, unit start will commence.
Chiller timer counting down. Unit ready for start.
Chiller START/STOP on MAINSTAT has been manually forced to start.
Chiller will start regardless of time schedule or remote contact status.
CCN loadshed module commanding chiller top stop.
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