8.9 Replacing the Premium-efficiency Control Board 44
8.9.1 Preparing to Replace the Board 44
8.9.2 Installing the Replacement Board 45
8.10 Pumped-refrigerant Economizer (PRE) 46
9 Preventive Maintenance Checklist 47
Appendices 51
Appendix A: Technical Support and Contacts 51
Appendix B: Submittal Drawings 53
Vertiv | Liebert® DSE500™ Installer/User Guide | 4
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