Navien NPE-180A Service Manual page 50

3. In the R&D information menu, use the Up (+) or Down (-)
buttons to move to 2.PAR (Parameter information mode), and
then press the Info button.
No. Mode
1 Technical information mode
2 Parameter information mode
4. In the Parameter information mode, use the Up (+) or Down (-)
buttons to select P.02 (Mixing control mode) and press the Info
button to enter.
No. Mode
1 Cascade protocol mode
2 Mixing control mode
3 Recirculation Type
5. In the Mixing control mode, use the Up (+) or Down (-) buttons
to select an option and press the Info button to set the mode.
Mode Description
1. Switches to the
Overshoot mode if
DHW use exceeds
23,000 times in
Auto 3 months of operation.
mode 2. Once any other mode
(Default) is selected, Auto mode
cannot be selected any
more (factory reset will
revert to the default
setting).
Normal No limitations on mixing
mode valve operation
Mode
Display method
Overshoot
mode
Off
Display method
4.7.20 Initial setting of a cascade system
1. At the <Normal operation mode>, press the [Diagnostic] +
[PLUS] button for over 5 seconds to set the current water
heater as the MASTER unit and to enter <Cascade setup
mode>.
2. Once in <Cascade setup mode>, it will be necessary to assign
an ID number to each slave water heater in the system. Be sure
that each slave unit has been connected using a Ready-Link
cable.
3. On each slave water heater, press the [Diagnostic] + [MINUS]
Display method
buttons for over 2 seconds to automatically receive an ID
number from the MASTER water heater. The ID number will
display on the front panel of each water heater.
4. The MASTER water heater will assign ID numbers sequentially
in the order that the slave water heaters are configured (1-15).
5. When all water heaters have been assigned an ID number,
press the [Diagnostic] + [PLUS] buttons on the MASTER unit for
over 5 seconds to complete the setup. The water heaters will
return to <Normal operation mode> and the cascade system
will be activated.
6. If the cascade setting is not completed within 1 hour, the
water heaters will revert to <Normal operation mode> and the
cascade system will not be active.
Description Display method
1. Mixing valve is
operated only when an
overshooting occurs.
2. Operation begins when
the DHW temperature
exceeds the target
temperature by
more than 14°F (8°C).
However, when the
DHW temperature
exceeds 131°F (55°C),
the mixing valve
operates to limit the
temperature to 131°F
(55°C).
Mixing valve control is
not in use (fully closed at
all times)
System Details 49