Liebert DS User Manual

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. 

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.

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.

When replacing a digital scroll compressor, digital solenoid coil must be replaced. Compressor and coil 

kit are shipped separately. 

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.

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.

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.