Specifications

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Check Safety and Operating Controls Monthly —
To ensure chiller protection, the automated Control Test
should be performed at least once per month. See Table 6
for safety control settings. See Table 15 for Control Test
functions.
Changing Oil Filter — Change the oil filter on a
yearly basis or when the chiller is opened for repairs. The
19XR has an isolatable oil filter so that the filter may be
changed with the refrigerant remaining in the chiller. Early
19XR compressors were designed with the oil filter housing
attached to the oil pump. The following procedure applies
to later 19XR compressors which have the oil filter separate
from the oil pump. Use the following procedure:
1. Ensure the compressor is off and the disconnect for the
compressor is open.
2. Disconnect the power to the oil pump.
3. Close the oil filter isolation valves, located behind the
power panel, on the top of oil pump assembly.
4. Close the isolation valves located on both ends of the oil
filter. Have rags and a catch basin available to collect oil
spillage.
5. Equalize the filter’s higher internal pressure to ambient
by connecting an oil charging hose to the Schrader valve
on the oil filter housing. Collect the oil-refrigerant mix-
ture which is discharged.
6. Remove the oil filter assembly by loosening the hex nuts
on both ends of the filter assembly.
7. Insert the replacement filter assembly with the arrow on
the housing pointing away from the oil pump.
8. Rotate the assembly so that the Schrader drain valve is
oriented at the bottom, and tighten the connection nut on
each end to a torque of approximately 30 ft-lb (41 N-m).
9. Evacuate the filter housing by placing a vacuum pump on
the charging valve. Follow the normal evacuation proce-
dures. Shut the charging valve when done and reconnect
the valve so that new oil can be pumped into the filter
housing. Fill with the same amount that was removed;
then close the charging valve.
10. Remove the hose from the charging valve, open the isola-
tion valves to the filter housing, and turn on the power to
the pump and the motor.
Oil Specification — If oil is added, it must meet the fol-
lowing 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 that a yearly oil
analysis be performed to determine when to change oil and
when to perform a compressor inspection. However, if yearly
analysis is not performed or available, the time between oil
changes should be no longer than 5 years.
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 condi-
tions, 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, re-
move 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 fil-
ter isolation valves (Fig. 2) and slowly opening the flare fittings
with a wrench and back-up wrench to relieve the pressure. A
moisture indicator sight glass is located beyond this filter to in-
dicate the volume and moisture in the refrigerant. If the mois-
ture indicator indicates moisture, locate the source of water im-
mediately 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
pressure line, and a filter on the cooler scavenging line. Re-
place 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 opening 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 only if the following symptoms are seen.
• There is a simultaneous drop in cooler pressure and
increase in condenser pressure. This will be accompa-
nied by an increase in kW/Ton.
• The liquid line downstream of the float valve feels warm.
This indicates condenser gas flowing past the float. An
increase in kW/Ton will also occur.
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. See
Fig. 50 for a view of the float valve design. Inspect the
orientation of the float slide pin. It must be pointed to-
ward the bubbler tube for proper operation.
Inspect Relief Valves and Piping — The relief valves
on this chiller protect the system against the potentially danger-
ous effects of overpressure. To ensure against damage to the
equipment and possible injury to personnel, these devices must
be kept in peak operating condition.
CAUTION
The oil filter housing is at a high pressure. Relieve this
pressure slowly. Failure to do so could result in serious per-
sonal injury.
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