Specifications

Oil Specification — If oil is added, it must meet the
following Carrier specifications:
Oil Type for units using R-134a ..............Inhibited
polyolester-based synthetic
compressor oil formatted for
use with HFC, gear-driven,
hermetic compressors.
ISO Viscosity Grade ............................68
The polyolester-based oil (P/N: PP23BZ103) may be
ordered from your local Carrier representative.
Oil Changes — Carrier recommends changing the oil
after the first year of operation and every five years there-
after as a minimum in addition to a yearly oil analysis. How-
ever, if a continuous oil monitoring system is functioning
and a yearly oil analysis is performed, the time between oil
changes can be extended.
TO CHANGE THE OIL
1. Transfer the refrigerant into the chiller condenser vessel
(for isolatable vessels) or to a pumpout storage tank.
2. Mark the existing oil level.
3. Open the control and oil heater circuit breaker.
4. When the chiller pressure is 5 psig (34 kPa) or less, drain
the oil reservoir by opening the oil charging valve
(Fig. 2). Slowly open the valve against refrigerant
pressure.
5. Change the oil filter at this time. See Changing Oil Filter
section.
6. Change the refrigerant filter at this time, see the next sec-
tion, Refrigerant Filter.
7. Charge the chiller with oil. Charge until the oil level is
equal to the oil level marked in Step 2. Turn on the power
to the oil heater and let the PIC II warm it up to at least
140 F (60 C). Operate the oil pump manually, using the
Control Test function, for 2 minutes. For shutdown con-
ditions, the oil level should be full in the lower sight glass.
If the oil level is above
1
⁄ 2 full in the upper sight glass,
remove the excess oil. The oil level should now be equal
to the amount shown in Step 2.
Refrigerant Filter — A refrigerant filter/drier, located
on the refrigerant cooling line to the motor, should be changed
once a year or more often if filter condition indicates a need
for more frequent replacement. Change the filter by closing
the filter isolation valves (Fig. 4) and slowly opening the
flare fittings with a wrench and back-up wrench to relieve
the pressure. A moisture indicator sight glass is located be-
yond this filter to indicate the volume and moisture in the
refrigerant. If the moisture indicator indicates moisture,
locate the source of water immediately by performing a
thorough leak check.
Oil Reclaim Filter — The oil reclaim system has a strainer
on the eductor suction line, a strainer on the discharge pres-
sure line, and a filter on the cooler scavenging line. Replace
the filter once per year or more often if filter condition in-
dicates a need for more frequent replacement. Change the
filter by closing the filter isolation valves and slowly open-
ing the flare fitting with a wrench and back-up wrench to
relieve the pressure. Change the strainers once every 5 years
or whenever refrigerant is evacuated from the cooler.
Inspect Refrigerant Float System — Perform this
inspection every 5 years or when the condenser is opened
for service.
1. Transfer the refrigerant into the cooler vessel or into a
pumpout storage tank.
2. Remove the float access cover.
3. Clean the chamber and valve assembly thoroughly. Be
sure the valve moves freely. Ensure that all openings are
free of obstructions.
4. Examine the cover gasket and replace if necessary. Clean
the pilot drain line strainer.
See Fig. 34 for views of the float valve design. For linear
float valve designs, inspect the orientation of the float slide
pin. It must be pointed toward the bubbler tube for proper
operation.
Inspect Relief Valves and Piping — The relief valves
on this chiller protect the system against the potentially dan-
gerous effects of overpressure. To ensure against damage to
the equipment and possible injury to personnel, these de-
vices must be kept in peak operating condition.
As a minimum, the following maintenance is required.
1. At least once a year, disconnect the vent piping at the
valve outlet and carefully inspect the valve body and mecha-
nism for any evidence of internal corrosion or rust, dirt,
scale, leakage, etc.
2. If corrosion or foreign material is found, do not attempt
to repair or recondition. Replace the valve.
3. If the chiller is installed in a corrosive atmosphere or the
relief valves are vented into a corrosive atmosphere, in-
spect the relief valves at more frequent intervals.
Turbine Strainer — A strainer is located at the inlet flange
on the turbine suction. The strainer should be inspected and
cleaned every 5 years. The refrigerant must be removed or
transferred to the condenser section before the strainer can
be accessed.
Turbine Maintenance — No special maintenance is
required for the turbine section. A visual inspection should
take place whenever the bearings and other compressor com-
ponents are inspected. Check that the nozzle block flow di-
viders are clean. See Fig. 35.
Compressor Bearing and Gear Maintenance —
The key to good bearing and gear maintenance is proper
lubrication. Use the proper grade of oil, maintained at rec-
ommended level, temperature, and pressure. Inspect the
lubrication system regularly and thoroughly.
To inspect the bearings, a complete compressor teardown
is required. Only a trained service technician should remove
and examine the bearings. The cover plate on older com-
pressor bases was used for factory-test purposes and is not
usable for bearing or gear inspection. The bearings and gears
should be examined on a scheduled basis for signs of wear.
The frequency of examination is determined by the hours of
chiller operation, load conditions during operation, and the
condition of the oil and the lubrication system. Excessive
bearing wear can sometimes be detected through increased
vibration or increased bearing temperature. If either symp-
tom appears, contact an experienced and responsible service
organization for assistance.
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