Connecting The Communication Cables - Navien NPE-32AWE 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 2 m/s may
cause pipe erosion. These specifications may vary depending on
installation conditions.
o
ΔT=12.2 C
Qty
Flow rate (LPM) Velocity (m/s)
1 30
2 54.43
3 81.64
4 108.89
5 136.11
6 163.32
7 190.54
8 217.64
9 244.97
10 272.22
11 299.43
12 326.65
13 353.86
14 381.07
15 408.29
16 435.54
17 462.75
18 489.97
19 517.18
20 544.4
21 571.61
22 598.82
23 626.08
24 653.29
25 680.51
26 707.72
27 734.93
28 762.15
29 789.4
30 816.61
The table above is based on model NPE-32AWE.
Note
Water Pipe Diameter
(mm/in)
1.5 20A ¾ in
1.7 25A 1 in
1.68 30A 1 ¼ in
1.58 40A 1 ½ in
2 40A 1 ½ in
1.36 50A 2 in
1.59 50A 2 in
1.82 50A 2 in
1.33 65A 2 ½ in
1.44 65A 2 ½ in
1.62 65A 2 ½ in
1.78 65A 2 ½ in
1.93 65A 2 ½ in
2.07 65A 2 ½ in
1.56 80A 3 in
1.66 80A 3 in
1.77 80A 3 in
1.87 80A 3 in
1.97 80A 3 in
2.08 80A 3 in
1.24 100A 4 in
1.29 100A 4 in
1.36 100A 4 in
1.42 100A 4 in
1.48 100A 4 in
1.54 100A 4 in
1.6 100A 4 in
1.66 100A 4 in
1.71 100A 4 in
1.77 100A 4 in
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, ensure that the power is turned off to all water
heaters.
Connect the Ready-Link cables to the J6 ports on the right side
of the front panel:
4.2.1 Configuring the Communication Settings
After connecting the Ready-Link communication cables, restore
power to the water heater and turn on all water heaters using
the Power button.
To configure the communication settings:
1. On the master water heater, press and hold the Diagnostic
and Up
appear on the display to confirm that this water heater is set
as the master.
Installing a Cascading System 39