Cascade Set-Up Procedure For Np/Nr Series Models - Navien NCB-150E Service Manual

4.4.14 Cascade Set-up Procedure
To configure the cascade communication settings:
1. On the master NCB-E boiler, press and hold the [Diagnostic]
and Up(+) buttons for more than 5 seconds. "MA.00" will
appear on the display to confirm that this combination boiler
is set as the master unit.
S
R O/R
2. On the slave water heaters, press and hold the [Diagnostic] and
Down(-) buttons for more than 2 seconds. "SL.01" will appear
on the display to confirm that this water heater is set as a slave
unit.
S
R O/R
3. Repeat step 2 to configure the rest of the slave units in the
system.
4. On the master NCB-E boiler, press and hold the Diagnostic and
Up(+) buttons for more than 5 seconds. All the display screens
on the configured units will return to the temperature display.
58 NCB-E Service Manual
S psi
R O/R
psi
S R O/R psi
psi
4.4.15 Cascade Set-up Procedure for NP/NR
Series Models
To configure the NR/NP series water heaters for a cascade system,
follow the instructions below:
1. Press the SW3 and SW4 (service switches on the main PCB)
simultaneously for more than 3 seconds on the NP/NR series
water heater. FND1 on the main PCB will display "S001" to
confirm that this water heater is set as the slave unit #1.
Dip S/W 5
SW4 SW3
2. Repeat step 1 on the other NR/NP series water heaters to add
more NR/NP slave units.
Version 1.4