10 Maintenance 53
10.1 Filters 54
10.1.1 Filter-replacement for Downflow Units 54
10.1.2 Filter-replacement for Upflow Units 55
10.2 Blower Drive System—EC Fans 56
10.2.1 Protective Features 56
10.2.2 Fan Impellers and Bearings Maintenance 57
10.2.3 Fan Assembly Troubleshooting 57
10.2.4 Removing EC Fans from Downflow Units 60
10.2.5 Removing EC Fans from Upflow Units 63
10.3 Infrared Humidifier Maintenance 67
10.3.1 Cleaning Humidifier Pan and Float Switch 67
10.3.2 Changing Humidifier Lamps 68
10.4 Condensate-drain and Condensate-pump System Maintenance 69
10.4.1 Condensate Drain 69
10.4.2 Condensate Pump 69
10.5 Electric Reheat Maintenance 69
10.6 Electronic Expansion Valve (EEV) Maintenance 70
10.7 Compressor Maintenance 70
10.7.1 Compressor Oil 70
10.7.2 Rotalock Valve 71
10.7.3 Replacement Compressors 71
10.7.4 Compressor Motor Burnout 71
10.7.5 Unloading Solenoid(s) on a Digital-scroll Compressor 71
10.7.6 Replacing the Compressor 72
10.8 Evaporator Coil Performance 72
10.9 Air-Cooled Condenser Maintenance 73
11 Preventive Maintenance Checklist 75
Appendices 81
Appendix A: Technical Support and Contacts 81
Appendix B: Disassembling the DSE for Transport 83
Appendix C: Submittal Drawings 93
Vertiv | Liebert® DSE™ Installer/User Guide | 4
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