Oil Filter Maintenance; Replacing The External Oil Filter; Replacing The Internal Oil Filter; Compressor Changeout Sequence - Carrier Ecologic Series 3 Controls, Start-Up, Operation, Service, And Troubleshooting

Oil Filter Maintenance —
own internal oil filter and each circuit also has an in-line exter-
nal filter. The internal oil filter pressure drop should be
checked and filter changed (if necessary) after the initial 200-
300 hours of compressor operation. It is recommended that oil
line pressure loss checks be made on an annual basis thereafter
to determine the need for filter changes. The need for filter
maintenance can be monitored through system pressure drop.
Discharge pressure is read at the oil separator and oil pressure
is read at the compressor. This pressure differential is typically
15 to 20 psi (103 to 138 kPa) for a system with clean internal
and external filters. See Pressure Transducers section, page 61
for information on removing discharge pressure transducers to
measure discharge pressure. Figure 18 shows the location of
the oil pressure bleed port on the compressor. A gage can be
attached to this point so that two pressure drops can be mea-
sured. The difference between discharge pressure and the gage
pressure will be the pressure loss due mainly to the external oil
filter. If this value exceeds 10 psi (69 kPa), replace the external
filter. The difference between the gage pressure and compres-
sor oil pressure is the pressure drop through the internal oil fil-
ter. Replace the internal oil filter if the pressure drop is greater
than 25 psi (173 kPa) for 30HXC and 30 psi (207 kPa) for
30GX and 30HXA chillers.

REPLACING THE EXTERNAL OIL FILTER

Compressor oil is pressurized. Use proper safety precau-
tions when relieving pressure.
Fully front seat (close) the angle valves on the filter and at
the compressor. Connect a charging hose to the oil pressure
bleed port and drain the oil trapped between service valves. A
quart (liter) of oil is typically what is removed during this pro-
cess. Remove the charging hose.
Unscrew the nut from the other side of the filter and remove
the old filter. Remove protective plastic caps from new filter
and install. Draw a vacuum at the bleed port. Remove charging
hose. Open angle valve enough to let oil flow. Check both fit-
tings for leaks and repair if necessary. Backseat angle valve.
REPLACING THE INTERNAL OIL FILTER — Close the
service valves at the compressor and drain the oil using the
bleed port. If the oil pressure does not bleed off using this
method it will be necessary to remove the entire circuit charge.
3
Using a / -in. allen wrench, remove the internal filter access
4
cover (see Fig. 18 and 19). Remove the old filter. Replacement
filters (one for each compressor) are factory supplied to cover
the first changeout. After that, filters are field supplied. Lightly
oil O-ring in the filter and install with filter open end first into
the housing. Replace access cover and retorque to 150 ft-lb
(203 N-m). Follow procedure in previous section for opening
angle valve and purging lines. Check for leaks and repair if
necessary.
Compressor Changeout Sequence —
sor service requires metric tools and hardware. Change com-
pressors according to the following procedure:
1. Turn off all main and control circuit power supplying the
machine.
2. Close the discharge and liquid valve(s), suction valve, and
cooler inlet line service valve (if equipped), oil line shutoff
valve, economizer bubble tube valve (30HXA,C161-271
only) and minimum load shutoff valve (if equipped) for
circuit to be changed. Disconnect the oil inlet line from the
compressor. Disconnect oil filter with fitting at shutoff
valve side and set filter and compressor inlet line assembly
aside.
3. Remove any remaining refrigerant in the compressor and
refrigerant lines using proper reclaiming techniques. All of
Each compressor has its
Compres-
the refrigerant that is in the cooler must be removed if
there is no suction service valve installed on the cooler.
IMPORTANT: Cooler and condenser pumps must be
energized. Fluid must be flowing through heat exchang-
ers whenever adding or removing charge.
4. Remove junction box cover of compressor to be changed.
Check main power leads for marked numbers. If no num-
bers are visible on leads, mark leads with appropriate
numbers to match those printed on the ends of the terminal
lugs. This is extremely important as power leads
MUST be installed on the exact terminals from which
they were removed.
5. Disconnect main power leads from compressor terminal
lugs. Mark remaining control circuit wires (connected
together with wire nuts) for ease of reconnecting later. The
following color scheme applies (verify with label diagram
on panel):
Loader 1
Loader 2
Motor Cooling Solenoid 1 Blue wire, 1 Brown wire *
Oil Solenoid
High-Pressure Switch
*One lead from the motor cooling and oil solenoids are connected
together with a single brown wire.
6. Remove loader (mark solenoids no. 1 and 2 for replace-
ment) and oil solenoids and high-pressure switch from
compressor. Using 2 wrenches, carefully remove the oil
pressure transducer from the compressor. These will all be
reconnected to the replacement compressor.
NOTE: Some oil will leak out of the transducer fitting
when the transducer is removed. See Fig. 18.
7. Mark motor temperature leads (2 blue wires) and remove
from quick connect terminals in the junction box.
The next steps involve compressor unbolting and removal.
Compressor seals are made using O-rings. Use care when
removing bolts and disconnecting flanges. The O-rings
must NOT be re-used. New O-rings are provided with the
replacement compressor. The 06N screw compressors
weigh approximately 920 lb (417 kg). Be sure that an
appropriate lifting cart or hoist is used to avoid injury. See
Fig. 20 for lifting locations and center of gravity dimen-
sions. Make sure compressor is properly rigged before
unbolting.
8. Remove the 2 bolts securing the motor cooling/economizer
line flange to the compressor.
OIL PRESSURE
TRANSDUCER
OIL
SOLENOID
LOADER
SOLENOID
NO. 2
LOADER
COVER
PLATE
Fig. 18 — Transducer Removal
58
2 Violet wires
2 Pink wires
1 Orange wire, 1 Brown wire*
2 Red wires
JUNCTION BOX
OIL BLEED PORT
INTERNAL OIL
FILTER ACCESS
(3/4 in.)
LOADER
SOLENOID
NO. 1
HIGH
PRESSURE
SWITCH