Carrier start-up and Spezifikationen PDF herunterladen (Seite 56)

100

Oil Filter Maintenance — Each compressor has its own

internal oil ﬁlter and each circuit also has an in-line external

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 pres-

sure loss checks be made on an annual basis thereafter to

determine the need for ﬁlter changes. The need for ﬁlter main-

tenance can be monitored through system pressure drop. Dis-

charge pressure is read at the oil separator and oil pressure

is read at the compressor. This pressure differential is typi-

cally 15 to 20 psi (103 to 138 kPa) for a system with clean

internal and external ﬁlters. See Pressure Transducers sec-

tion, page 59 for information on removing discharge pres-

sure transducers to measure discharge pressure. Figure 18

shows the location of the oil pressure bleed port on the com-

pressor. A gage can be attached to this point so that two pres-

sure drops can be measured. 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 compressor oil pressure is the pres-

sure drop through the internal oil ﬁlter. Replace the internal

oil ﬁlter if the pressure drop is greater than 30 psi (207 kPa).

REPLACING THE EXTERNAL OIL FILTER

Compressor oil is pressurized. Use proper safety pre-

cautions when relieving pressure.

Fully front seat (close) the angle valve on the ﬁlter. Connect

a charging hose to the oil pressure bleed port and drain the

oil trapped between the ﬁlter and the internal check valve.

Use the function to cycle the oil solenoid a few times

to properly seat the internal check valve as the pressure is

being relieved. If the oil pressure does not bleed off using

this method it will be necessary to remove the entire circuit

charge. A pint of oil is typically what is removed during this

process. 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 charg-

ing hose. Open angle valve enough to let oil ﬂow. Check

both ﬁttings for leaks and repair if necessary. Backseat angle

valve.

REPLACING THE INTERNAL OIL FILTER — Follow the

procedure above to the point that the oil has been drained

from the bleed port. Using a

⁄

-in. allen wrench, remove the

internal ﬁlter access cover (see Fig. 18). Remove the old ﬁl-

ter. Replacement ﬁlters (one for each compressor) are fac-

tory supplied to cover the ﬁrst changeout. After that, ﬁlters

are ﬁeld supplied. Remove the old O-ring from internal check

valve. Lightly oil O-ring and install into groove. Install new

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

NOTE: Replacement compressors can be ordered by calling

800-CARLYLE (800-227-5953). In most cases, replace-

ment compressors can be shipped in 1 to 2 business days.

Compressor service requires metric tools and hardware.

Change compressors 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 com-

pressor inlet line assembly aside.

3. Remove any remaining refrigerant in the compressor and

refrigerant lines using proper reclaiming techniques. All

of 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

exchangers 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 ter-

minal 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 2 Violet wires

Loader 2 2 Pink wires

Motor Cooling Solenoid 1 Blue wire, 1 Brown wire *

Oil Solenoid 1 Orange wire, 1 Brown wire*

High-Pressure Switch 2 Red wires

*One lead from the motor cooling and oil solenoids are con-

nected 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 re-

move 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 com-

pressor. The 06N screw compressors weigh ap-

proximately 900 pounds. Be sure that an appro-

priate lifting cart or hoist is used to avoid injury.

See Fig. 19 for lifting locations and center of grav-

ity dimensions. Make sure compressor is properly

rigged before unbolting.

8. Remove the 2 bolts securing the motor cooling/economizer

line ﬂange to the compressor.

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