Navien NPE-180A Service Manual

Also see for NPE-180A: Installation manual Installation & operation manual Specification sheet Installation manual Operation manual

Contents

Navien NPE-180A Service Manual Manual pdf 164 page image

H2Air++ 163Connecting the Main Control ConnectorTo connect the H2Air++ to the Navien NPE-180A/240A waterheater, use the 13-pin main control connector supplied with theNavien H2Air++. Connect one end of the cable to the connectorsocket on the H2Air++ PCB. Then, connect the other end to theconnector socket on the NPE-180A/240A water heater PCB.10.4 Configuring the DeviceThis section provides the information required to set the desiredoptions for the NPE-180A/240A water heater system with theH2Air++ add-on controller.10.4.1 Pump Control OptionsCAUTIONThe drawings in this instruction are intended only as a guideand are not replacements for professional engineeringdrawings. This drawing represents a concept system anddoes not imply compliance with local building codes. Actualinstallation requirements may vary depending on installationlocations and parameters. All installation work must be carriedout in accordance with all local building codes. Verify with localbuilding officials before commencing system installation.The following example demonstrates the application of pumpcontrol configuration options.A System with the Internal Circulation PumpSet the 2-way valve inside the water heater to ‘EXT’. For moreinformation about settings, refer to “Selecting a RecirculationMode (“A” model only)” in the Water Heater Installation Manual.WARNINGAn anti-scalding device must be installed in the system in orderto limit the DHW output temperature and prevent scalding.Setting the valve to 115-120°F is recommended.