Navien NPE-180A Service Manual page 51

Mode Description
Set as MASTER
MASTER
unit and assign
setting
ID numbers to
mode
slave units
When given an
SLAVE ID
initialization
initialization
command from
condition
the MASTER unit
SLAVE ID When given
assignment an ID from the
condition MASTER unit
4.7.21 Cancellation of a cascade system
1. If the [Diagnostic] + [reset] buttons are pressed for over
5 seconds while in <Normal operation mode> at the MASTER
unit with CASCADE turned ON, then all units in the CASCADE
SYSTEM are released and work individually.
2. In order to reset the CASCADE SYSTEM after releasing it, repeat
the CASCADE SYSTEM initialization procedure as described
previously.
3. If the [Diagnostic] + [reset] buttons are pressed for over
5 seconds while in <Normal operation mode> at the SLAVE
unit where the CASCADE communication error(E.736) occurred
with CASCADE turned ON, then the SLAVE unit is released from
the CASCADE SYSTEM and works individually.
50 NPE Service Manual
Display method
MASTER icon flashing
ex) ID 12
4.7.22 Cascade system – Master unit
replacement
Configuration with NPE units only
In order to replace the Master water heater and the controller or
change a slave unit into the MASTER unit, cancel the CASCADE
SYSTEM and then repeat the CASCADE SYSTEM initialization
procedure as described previously.
4.7.23 Cascade system – Slave unit addition
Configuration with NPE units only
1. In order to add an additional slave unit, connect a Ready-Link
communication cable to the new unit and wait for the MASTER
unit to automatically recognize the new unit. The slave unit will
automatically enter <SLAVE addition mode> and display SL--
on the front panel.
2. At the new slave unit, press the [Diagnostic] + [MINUS] button
once to receive an ID number from the MASTER unit. The ID
number will display for 5 seconds and then return to <Normal
operation mode> linked into the CASCADE system.
Mode Description
When connecting a
SLAVE
new slave unit with a
addition
Ready-Link cable to the
mode
CASCADE system
Given an ID from
SLAVE ID
MASTER, and then
assignment
the ID is displayed for
condition
5 seconds
NOTE
NPE water heaters and NR, NP, or CH units use different
●
communication protocols. Therefore, an additional setup is
required when replacing an NR, NP, or CH unit in a cascade
system with an NPE water heater.
When replacing an NR, NP, or CH unit in a cascade system
●
with an NPE water heater, the NPE unit can only be
configured as a slave unit, and one of the the NP, NR, or CH
units in the system must be configured as the master unit.
Display method
ex) ID 12
Version 2.21