Navien NPE-180A Installation Manual

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Navien NPE-180A Installation Manual Manual pdf 36 page image

36 Installing a Cascading System4.2 Connecting the Communication CablesUp to 16 water heaters can be connected with Navien Ready-Linkcommunication cables. Select one of the water heaters in thecascading system as the master water heater, and then connect theother water heaters to it as slaves. Before making any connections,ensure that the power is turned off to all water heaters.Connect the Ready-Link cables to the J6 ports on the right side ofthe front panel:4.2.1 Configuring the Communication SettingsAfter connecting the Ready-Link communication cables, restorepower to the water heater and turn on all water heaters using thePower button.To configure the communication settings:On the master water heater, press and hold the1. Diagnosticand Up(+) buttons for more than 5 seconds. “MA.00” willappear on the display to confirm that this water heater is set asthe master.4.1.1 Piping Sizes and ConsiderationsWhen plumbing a cascading system, consider the following pipediameters and flow rates. Note that flow rates above 6.6 ft/s maycause pipe erosion. These specifications may vary depending oninstallation conditions.Qty ΔT=54ºFFlow rate (GPM)WaterVelocity (ft/s)PipeDiameter (mm/in)1 7.19 4.78 20A 3/4"2 14.38 5.61 25A 1"3 21.57 5.54 30A 11/4"4 28.77 5.21 40A 11/2"5 35.96 6.53 40A 11/2"6 43.15 4.49 50A 2"7 50.34 5.24 50A 2"8 57.5 6.00 50A 2"9 64.72 4.39 65A 2 1/2"10 71.92 4.75 65A 2 1/2"11 79.11 5.34 65A 2 1/2"12 86.30 5.84 65A 2 1/2"13 93.49 6.33 65A 2 1/2"14 100.68 6.79 65A 2 1/2"15 107.87 5.11 80A 3"16 115.07 5.44 80A 3"17 122.26 5.81 80A 3"18 129.45 6.14 80A 3"19 136.64 6.46 80A 3"20 143.83 6.83 80A 3"21 151.02 4.06 100A 4"22 158.21 4.25 100A 4"23 165.41 4.45 100A 4"24 172.60 4.65 100A 4"25 179.79 4.85 100A 4"26 186.98 5.05 100A 4"27 194.17 5.24 100A 4"28 201.36 5.44 100A 4"29 208.56 5.61 100A 4"30 215.75 5.81 100A 4"Note The table above is based on model NPE-240A.