12 Maintenance 53
12.1 Filters 53
12.1.1 Replacing the Filters 54
12.2 Fan Maintenance 55
12.2.1 Fan Assembly Troubleshooting 55
12.2.2 Fan Impellers 56
12.2.3 Blower-motor Lubrication 56
12.2.4 Removing Fan Assembly 56
12.3 Condensate-drain and Condensate-pump System Maintenance 56
12.3.1 Condensate Drain 56
12.3.2 Condensate Pump 57
12.4 Electronic Expansion Valve (EEV) Maintenance 57
12.5 Compressor Maintenance 57
12.5.1 Compressor Oil 57
12.5.2 Rotalock Valve 58
12.5.3 Replacement Compressors 58
12.5.4 Compressor Motor Burnout 58
12.5.5 Unloading Solenoid(s) on a Digital-scroll Compressor 58
12.5.6 Replacing the Compressor 59
12.6 Evaporator Coil 59
12.7 Air-Cooled Condenser Maintenance 60
13 Preventive Maintenance Checklist 61
Appendices 65
Appendix A: Technical Support and Contacts 65
Appendix B: Submittal Drawings 67
Appendix C: Guide Specifications 69
Vertiv | Liebert® DSE™ System Design and User Guide | 4
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