6.3 Return Air Sensor 54
6.3.1 Internal Temperature/Humidity Sensor 54
6.3.2 Remote Temperature/Humidity Sensor 54
6.4 2T Wired Remote Sensors 54
7 Checklist for Completed Installation 57
7.1 Moving and Placing Equipment 57
7.2 Electrical Installation Checks 57
7.3 Piping Installation Checks 57
7.4 Other Installation Checks 58
8 Initial Start-up Checks andîš´Commissioning Procedureîš´forîš´Warrantyîš´Inspection 59
9 Maintenance 61
9.1 Filters 62
9.1.1 Filter-replacement for Downflow Units 62
9.1.2 Filter-replacement for Upflow Units 62
9.1.3 Filter-replacement for Upflow Units with Rear Return 63
9.2 Blower Drive System—EC Fans 63
9.2.1 Fan Impellers and Bearings 63
9.2.2 Protective Features 64
9.2.3 Fan Assembly Troubleshooting 64
9.2.4 Replacing EC Fans in Downflow Models 67
9.2.5 Replacing EC Fans in Upflow Models 71
9.3 Infrared Humidifier Maintenance 73
9.3.1 Cleaning Humidifier Pan and Float Switch 73
9.3.2 Changing Humidifier Lamps 74
9.4 Steam-generating Humidifier Maintenance 75
9.4.1 Removing the Old Canister 77
9.4.2 Mandatory Cleaning of the Drain Valve 77
9.4.3 Installing the New Canister 78
9.4.4 Humidifier Troubleshooting 79
9.5 Condensate-drain and Condensate-pump System Maintenance 83
9.5.1 Condensate Drain 83
9.5.2 Condensate Pump 83
9.6 Air-Cooled Condenser and Drycooler Maintenance 83
9.7 Electric Reheat Maintenance 83
9.8 Thermostatic Expansion Valve (TXV) Maintenance 83
9.8.1 Determining Suction Superheat 84
9.8.2 Adjusting Superheat Setting with the TXV 84
9.9 Electronic Expansion Valve (EEV) Maintenance 84
9.10 Compressor Maintenance 85
9.10.1 Compressor Oil 85
9.10.2 Scroll and Digital-scroll Compressor Maintenance 85
9.10.3 Replacement Compressors 85
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 4
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