Specifications

99
Periodically vacuum or blow off accumulated debris on the
internal parts with a high-velocity, low-pressure blower.
Power connections on newly installed starters may relax
and loosen after a month of operation. Turn power off and re-
tighten. Recheck annually thereafter.
Recalibrate Pressure Transducers — Once a
year, the pressure transducers should be checked against a pres-
sure gage reading. Check all eight transducers: the 2 oil differ-
ential pressure transducers, the condenser pressure transducer,
the cooler pressure transducer, and the optional waterside pres-
sure transducer pairs (consisting of 4 flow devices: 2 cooler, 2
condenser).
Note the evaporator and condenser pressure readings on the
HEAT_EX screen on the ICVC (EVAPORATOR PRESSURE
and CONDENSER PRESSURE). Attach an accurate set of re-
frigeration gages to the cooler and condenser Schrader fittings.
Compare the two readings. If there is a difference in readings,
the transducer can be calibrated as described in the Trouble-
shooting Guide section. Oil differential pressure (OIL PUMP
DELTA P on the COMPRESS screen) should be zero whenev-
er the compressor is off.
Optional Pumpout System Maintenance — For
pumpout unit compressor maintenance details, refer to the
19XR Positive Pressure Storage System Installation, Start-Up,
and Service Instructions.
OPTIONAL PUMPOUT COMPRESSOR OIL
CHARGE — Use oil conforming to Carrier specifications
for reciprocating compressor usage. Oil requirements are as
follows:
ISO Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 or 220
Carrier Part Number . . . . . . . . . . . PP23BZ103 or PP23BZ104
The total oil charge is 13 oz. (0.5 L)
Oil should be visible in the pumpout compressor sight glass
both during operation and at shutdown. Always check the oil
level before operating the pumpout compressor. Before adding
changing oil, relieve the refrigerant pressure through the access
valves.
Relieve refrigerant pressure and add oil to the pumpout unit
as follows:
1. Close service valves 2 and 4.
2. Run the pumpout compressor in Automatic mode for one
minute or until the vacuum switch is satisfied and com-
pressor shuts off.
3. Move the pumpout selector switch to OFF. Pumpout
compressor shell should now be under vacuum.
4. Oil can be added to the shell with a hand oil pump
through the access valve in the compressor base.
NOTE: The compressor access valve has a self-sealing fitting
which will require a hose connection with a depressor to open.
OPTIONAL PUMPOUT SAFETY CONTROL SETTINGS
(Fig. 51) — The optional pumpout system high-pressure
switch opens at 185 psig (1276 kPa) and closes at 140 psig
(965 kPa). Check the switch setting by operating the pumpout
compressor and slowly throttling the pumpout condenser
water.
Ordering Replacement Chiller Parts — When
ordering Carrier specified parts, the following information
must accompany an order:
• chiller model number and serial number
• name, quantity, and part number of the part required
• delivery address and method of shipment.
TROUBLESHOOTING GUIDE
Overview —
The PIC II has many features to help the op-
erator and technician troubleshoot a 19XR chiller.
• The ICVC shows the chiller’s actual operating condi-
tions 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, SURGPREV,
LL_MAINT, ISM_HIST, LOADSHED, CUR_ALARM,
WSMDEFME, and OCCDEFCM screens) display infor-
mation that helps to diagnose problems with chilled
water temperature control, chilled water temperature
control overrides, hot gas bypass, surge algorithm status,
and time schedule operation.
• The control test feature facilitates the proper operation
and test of temperature sensors, pressure transducers, the
guide vane actuator, diffuser actuator (if equipped), oil
WARNING
Before working on any VFD, shut off the chiller, open and
tag all disconnects supplying power to the VFD. After dis-
connecting input power to a VFD and before touching any
internal components, wait five minutes for the DC bus
capacitors to discharge, then check the voltage with a volt-
meter. Failure to observe this precaution could result in
severe bodily injury or death.
WARNING
The disconnect on the VFD front panel does not deenergize
all internal circuits. Open all internal and remote discon-
nects before servicing the VFD.
WARNING
Never open isolating knife switches while equipment is
operating. Electrical arcing can cause serious injury.
CAUTION
Loose power connections can cause voltage spikes, over-
heating, malfunctioning, or failures.
CONTACTOR
TERMINAL
STRIP
FUSES
TRANSFORMER
SWITCH
Fig. 51 — Pumpout Control Box (Interior)
a19-1569
RESET