96
Ordering Replacement Chiller Parts — When or-
dering Carrier specified parts, the following information must
accompany an order.
• chiller model number and serial number
• VFD model number and serial number (if applicable)
• name, quantity, and part number of the part required
• delivery address and method of shipment
TROUBLESHOOTING GUIDE
Overview —
The PIC III controls have many features to
help the operator and technician troubleshoot a 23XRV chiller.
• The ICVC shows the chiller’s actual operating conditions
and can be viewed while the unit is running.
• The ICVC default screen freezes when an alarm occurs.
The freeze enables the operator to view the chiller condi-
tions at the time of alarm. The STATUS screens continue
to show current information. Once all alarms have been
cleared (by correcting the problems and pressing the
softkey), the ICVC default screen returns to
normal operation.
• The CONTROL ALGORITHM STATUS screens (which
include the CAPACITY, OVERRIDE, LL_MAINT,
VFD_HIST, CUR_ALRM, LOADSHED, WSMDEFME,
and OCCDEFCM screens) display information that helps to
diagnose problems with chilled liquid temperature control,
chilled liquid temperature control overrides, hot gas bypass,
surge algorithm status, and time schedule operation. Refer
to Table 18.
• The CONTROL TEST screen under the SERVICE menu
facilitates the proper operation and test of temperature
sensors, pressure transducers, oil reclaim output, head
pressure output, oil pump, liquid pumps, tower control, and
other discrete on/off outputs while the compressor is
stopped. It also has the ability to lock out the compressor
and turn on liquid pumps for pumpout operation. The ICVC
shows the temperatures and pressures required during these
operations.
• From other SERVICE tables, the operator or technician can
access configured items, such as chilled liquid temperature
resets, override set points, etc.
• If an operating fault is detected, an alarm or alert message is
generated and displayed on the ICVC default screen. A
more detailed message — along with a diagnostic message
— is also stored into the ALARM HISTORY and ALERT
HISTORY tables. Refer to Tables 19 and 20.
• Review the ALERT HISTORY table to view other less crit-
ical events and abnormal conditions which may have
occurred. Compare timing of relevant alerts and alarms.
Table 18 — Control Algorithm
Maintenance Screens
*The HEAT_EX screen is under the STATUS menu.
Fig. 59 — Optional Pumpout System Controls
a23-1569
CONTROL BOX (INTERIOR)
SCREEN TITLE DESCRIPTION
CAPACITY
Capacity
Control
This table shows all values
used to calculate the chilled
liquid control point.
OVERRIDE
Override
Status
Details of all chilled liquid and
VFD control override values.
LL_MAINT
LEAD/LAG
Status
Indicates LEAD/LAG
operation status.
VFD_HIST
VFD Alarm
History
Displays VFD values at last
fault.
LOADSHED
Loadshed
Status
Displays Loadshed (Demand
Limit) status.
CUR_ALRM
Current
Alarm Status
Displays current chiller
alarms.
WSMDEFME
Liquid
System
Manager
Status
The liquid system manager is
a CCN module that can turn
on the chiller and change the
chilled liquid control point. This
screen indicates the status of
this system.
OCCDEFCM
Time
Schedules
Status
The Local and CCN occupied
schedules are displayed here
to help the operator quickly
determine whether the
schedule is in the “occupied”
mode or not.
HEAT_EX*
HGBP
Status
The hot gas bypass control
algorithm status is viewed
from this screen. All values
related to this control are
displayed.
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