Connecting The Communication Cables - Navien NPE-180A Installation Manual

4.1.1 Piping Sizes and Considerations
When plumbing a cascading system, consider the following pipe
diameters and flow rates. Note that flow rates above 6.6 ft/s may
cause pipe erosion. These specifications may vary depending on
installation conditions.
ΔT=54 ºF
Qty
Flow rate (GPM)
1 7.19
2 14.38
3 21.57
4 28.77
5 35.96
6 43.15
7 50.34
8 57.5
9 64.72
10 71.92
11 79.11
12 86.30
13 93.49
14 100.68
15 107.87
16 115.07
17 122.26
18 129.45
19 136.64
20 143.83
21 151.02
22 158.21
23 165.41
24 172.60
25 179.79
26 186.98
27 194.17
28 201.36
29 208.56
30 215.75
38 Installing a Cascading System
Water Pipe
Velocity (ft/s) Diameter (mm/in)
3
4.78 20A
5.61 25A
5.54 30A 1
5.21 40A 1
1
6.53 40A
4.49 50A
5.24 50A
6.00 50A
4.39 65A
2
4.75 65A 2
5.34 65A 2
5.84 65A
2
6.33 65A 2
6.79 65A 2
5.11 80A
5.44 80A
5.81 80A
6.14 80A
6.46 80A
6.83 80A
4.06 100A
4.25 100A
4.45 100A
4.65 100A
4.85 100A
5.05 100A
5.24 100A
5.44 100A
5.61 100A
5.81 100A
The table above is based on model NPE-240A.
Note

4.2 Connecting the Communication Cables

Up to 16 water heaters can be connected with Navien Ready-Link
communication cables. Select one of the water heaters in the
cascading system as the master water heater, and then connect the
other water heaters to it as slaves. Before making any connections,
/ in
ensure that the power is turned off to all water heaters.
4
1 in
Connect the Ready-Link cables to the J6 ports on the right side of
1
/ in
4
the front panel:
1
/ in
2
1
/ in
2
2 in
2 in
2 in
1
/ in
2
1
/ in
2
1
/ in
2
1
/ in
2
1 / in
2
1
/ in
2
3 in
4.2.1 Configuring the Communication Settings
3 in
3 in
After connecting the Ready-Link communication cables, restore
power to the water heater and turn on all water heaters using the
3 in
Power button.
3 in
To configure the communication settings:
3 in
1. On the master water heater, press and hold the Diagnostic
4 in
and Up(+) buttons for more than 5 seconds. "MA.00" will
appear on the display to confirm that this water heater is set as
4 in
the master.
4 in
4 in
4 in
4 in
4 in
4 in
4 in
4 in