Navien NPE-180A2 Installation Manual page 96

Item Description
Number of an individual
1. Cascade Info
water heater and the status
Number of currently
2. Number of Oper-Unit
operating cascade units
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3. Cascade System
Setting
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To enter the Cascade
Setting Mode, select
START on the main unit.
The setting mode is
entered and the IDs of all
water heaters that can
communicate with the
main unit via the RS-485
communication line are
initialized.
The water heaters whose
IDs are initialized by the
main unit are set to <Sub
setting mode>, if you press
and hold the OK button
( ) for 3 seconds or
more, the main unit
gives you the ID and it
is displayed on the front
panel.
The main unit periodically
checks the RS-485
communication, and when
there is an ID request
from the sub unit, the ID is
sequentially incremented
and added to the Sub (1
to 32).
Press the OK button ( )
in the Main to complete
the cascade setting. The
main unit and the sub
unit with an assigned ID
will return to the normal
operation mode with the
cascade setting ON. The
icon will appear the
main unit's front panel.
In Main setting mode, if
no input is detected for 60
minutes, the water heater
resumes normal operation
without cascading.
Item Description
Execute this menu on the
main unit of a cascade system
to end cascade operation. All
units will return to a single
water heater setup.
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4. Cascade System
Removal
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Set the ventilation type.
5. Cascade Vent Setting
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On the main unit, turn on
or off all units in a cascade
system.
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6. Cascade Disable
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Set the number of initial
activating units in the
7. Cascade init oper
cascade system.
Number
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Set the minimum number of
units in the cascade system.
8. Cascade Min oper
Number
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Set the heating capacity
compensation standard
when the cascade
9. Cascade Unit ON HC
combustion is ON.
Offset
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Operating the Water Heater
Access the 3. Cascade
System Setting to
reassign IDs and begin a
cascade system again.
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.
Default: Common Vent
You can also press and
hold the Menu button ( )
and the Back button ( )
simultaneously for
5 seconds.
On a sub unit, turn the unit
on or off.
Setting range: Auto, 1 - 32
Default: Auto
Setting range: 1 - 32
Default: 1
Setting range: –15% -
+15%
Default: 0%
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