76
Inspect starter contact surfaces for wear or pitting on me-
chanical-type starters. Do not sandpaper or file silverplated
contacts. Follow the starter manufacturer’s instructions for
contact replacement, lubrication, spare parts ordering, and oth-
er maintenance requirements.
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.
Check Pressure Transducers —
Once a year, the
pressure transducers should be checked against a pressure gage
reading. Check all 7 transducers: the oil pressure transducer,
the condenser pressure transducer, the cooler pressure trans-
ducer, and the waterside pressure transducers (consisting of 4
flow devices: 2 cooler, 2 condenser).
Note the evaporator and condenser pressure readings on the
HEAT_EX screen on the CVC (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
compressor maintenance details, refer to the 06D, 07D Installa-
tion, 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:
•
HCFC-22 and HFC-134a
ISO Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
•
Viscosity SSU 100 F (38 C) . . . . . . . . . . . . . . . . . . . 300
•
Carrier Part Number . . . . . . . . . . . . . . . . . . PP23BZ-103
The total oil charge, 4.5 pints (2.6 L), consists of 3.5 pints
(2.0 L) for the compressor and one additional pint (0.6 L) for
the oil separator.
Oil should be visible in one of the compressor sight glasses
during operation and at shutdown. Always check the oil level
before operating the compressor. Before adding or changing
oil, relieve the refrigerant pressure as follows:
1. Attach a pressure gage to the gage port of either com-
pressor service valve.
2. Close the suction service valve and open the discharge
line to the storage tank or the chiller.
3. Operate the compressor until the crankcase pressure
drops to 2 psig (13 kPa).
4. Stop the compressor and isolate the system by closing
the discharge service valve.
5. Slowly remove the oil return line connection (Fig. 39).
Add oil as required.
6. Replace the connection and reopen the compressor
service valves.
OPTIONAL PUMPOUT SAFETY CONTROL SETTINGS
(Fig.
41)
—
The optional pumpout system high-pressure
switch should open at 220 ± 5 psig (1517 ± 34 kPa) and should
reset automatically on pressure drop to 190 psig (1310 kPa) for
HCFC-22 chillers. For chillers using HFC-134a, the switch
opens at 161 psig (1110 kPa) and closes at 130 psig (896 kPa).
Check the switch setting by operating the pumpout compressor
and slowly throttling the pumpout condenser water.
Ordering Replacement Chiller Parts —
When or-
dering 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 23XL chiller.
•
The CVC shows the chiller’s actual operating conditions
and can be viewed while the unit is running.
•
The CVC 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 CVC default screen returns to
normal operation.
•
The CONTROL ALGORITHM STATUS screens
(which include the CAPACITY, OVERRIDE,
LL_MAINT, ISM_HIST, LOADSHED, WSMCHLRS,
and OCCDEFCM screens) display information that
helps to diagnose problems with chilled water tempera-
ture control, chilled water temperature control overrides,
hot gas bypass, surge algorithm status, and time sched-
ule operation.
•
The Control Test feature facilitates the proper operation
and test of temperature sensors, pressure transducers, the
guide vane actuator, oil pump, water pumps, tower con-
trol, and other on/off outputs while the compressor is
stopped. It also has the ability to lock off the compressor
and turn on water pumps for pumpout operation. The
CVC shows the temperatures and pressures required
during these operations.
•
From other SERVICE tables, the operator or technician
can access configured items, such as chilled water resets,
override set points, etc.
Loose power connections can cause voltage spikes, over-
heating, malfunctioning, or failures.
RESET
Fig. 41 — Optional Pumpout System Controls