Liebert DS Compressor Replacement, Facility Fluid and Piping Maintenance, Models 053, 070 and

Maintenance

12.8Compressor Replacement

Replacement compressors are available through your local Emerson office. Compressors are shipped in reusable packaging. If unit is under warranty, complete and include Liebert Service Credit Appli- cation (LSCA) with the compressor that is being returned. The original compressor should be returned in the same packaging.

12.8.1Compressor Motor Burnout

If a burnout has occurred, a full system clean-out is required; if not, compressor and system problems will continue.

For clean-out warnings and procedures, see Copeland Application Engineering Bulletin 24-1105 “Principles of Cleaning Refrigeration Systems” or Carlyle Service Guide, Literature # 020-611.

12.8.2Digital Compressor Unloading Solenoid(s) Models 028, 035 and 042

When replacing a digital scroll compressor, digital solenoid valve and coil must be replaced. Compres- sor and valve kit are shipped separately. Valve kit must be field-brazed to top of compressor in proper orientation and supported with original factory bracket.

Models 053, 070 and 077

When replacing a digital scroll compressor, digital solenoid coil must be replaced. Compressor and coil kit are shipped separately.

12.8.3Compressor Replacement Procedure

1.Disconnect power and follow all warnings at front of this manual.

2.Attach suction and discharge gauges to access fittings.

3.Front-seat service valves to isolate the compressor. Reclaim charge from compressor.

4.Remove marked pressure transducer and discharge pressure switch. Disconnect all electrical connections.

5.Detach service valves from compressor.

6.Remove failed compressor.

7.If required, follow compressor manufacturer’s suggested clean-out procedures.

8.Install replacement compressor and make all connections. Replace gaskets or seals on service valves. Replace unloading solenoid.

9.Evacuate, charge and operate per 8.3 - Dehydration/Leak Test and Charging Procedures for R-407C and R-22.

10.Semi-hermetic only: see 5.3 - Semi-Hermetic Compressor Spring Isolation System for compressor spring adjustment.

! CAUTION

Risk of improper component reinstallation. Can cause equipment damage.

Identify and mark location of suction pressure transducer and discharge pressure switch. These devices look similar and they must be reinstalled in their original location.

12.9Facility Fluid and Piping Maintenance

Facility water and glycol quality remain a requirement throughout the life of the piping system. Fluid and piping system maintenance schedules must be established and performed. A local fluid mainte- nance program must be established that will evaluate fluid chemistry and apply necessary treatment. A periodic leak inspection of facility and unit fluid piping is recommended. Refer to 8.1.3 - Require- ments of Systems Using Water or Glycol.

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