Configuring A Cascade System - Navien NFC-175 Service Manual

4.9.4 Configuring a Cascade System

To view and configure the cascade settings, press the Back button
( ) and the Menu button (
and then select "4. Cascade Status and Set".
Rotate the Command dial (
or to increase/decrease setting values. Press the Command dial
( ) to select a parameter or to confirm after making changes.
Press the Back button (
menu.
Item
1. Cascade System
Setting
46 NFC Service Manual
) simultaneously for 3 seconds,
) to switch between the parameters
) to return to the previous screen or
Description
To enter the Cascade Main setting
●
mode, select Start.
The setting mode is entered and
●
the IDs of all boilers that can
communicate with the Main via
the RS485 communication line are
initialized.
The boilers whose IDs are initialized
●
by the Main are set to <Sub setting
mode>, if you press the OK button
for 2 seconds or more, the Main gives
you the ID and it is displayed on the
screen.
The Main periodically checks the
●
RS485 communication, and when
there is an ID request from the Sub,
the ID is sequentially incremented
and added to the Sub (1 to 16).
Select OK in the Main to complete
●
the cascade setting, and the Main
and the assigned Sub IDs will return
to <Normal operation mode> and
turn into CASCADE ON state. At this
time, the Main icon on the Main
panel lights up.
If the cascade setting is idle for more
●
than 1 hour, it returns to <Normal
operation mode> and reverts to
CASCADE OFF state automatically.
Item
Select this option on the Main unit
of a cascade system to end cascade
operation.
Enter Cascade system setting mode
●
to reassign IDs and begin a cascade
2. Cascade System
system again.
Removal
If a Sub unit has a network
●
communication problem, select this
option on the Sub unit to exclude
the individual unit from the cascade
system.
Set the initial number of activated
boilers.
3. Cascade Init-
operation Unit Setting range: 0 – 16
●
Default: 0
●
Set the cascade protocol.
4. Cascade Protocol NPE or NR
●
Default : NPE
●
5. Number of Oper- The number of units currently
Unit operating in the cascade system.
View the operating status of individual
6. Cascade Info.
units in the cascade system.
Set the type of ventilation.
7. Vent Type Setting
Default: Common vent
●
Description
Version 1.0