28 Installing the Water Heater
3.4.3 Adjusting the Recirculation
Parameters
Entering the R&D Information Menu
Follow the instructions below to enter the R&D
information menu.
1. On the Front panel, press the Power button to
turn off the water heater.
2. Enter the R&D information menu by pressing
the Up (+) button three times, the Down (-)
button three times, and then the Up (+) button
four more times.
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
Display
1
Technical Information
2
Parameter Information
4. To return to the previous menu (R&D
information menu), press the [Reset] button
once.
Items Name
Description
Display
12. P12 Pump Cycle
Interval
Set the
maximum
time for pump
operation or
on-demand
operation.
14. P14
Pump
Sampling
Time
Set the pump
cycle ON interval.
15. P15 Differential
OFF Temp
Set the offset
temperature
to turn off the
preheating
operation
(function
disabled with
HotButton Kit).
17. P17
Thermal
Bypass Valve
Enable
Activate for use
with NaviCirc
recirculation
valve.
3.4.2 Using the Water Heater for
Combination Water Heating and Space
Heating
When using the water heater for both water
(potable) heating and space heating, follow these
guidelines:
●
Ensure that all piping and components connected
the water heater are suitable for potable water
applications.
●
Do not introduce toxic chemicals, such as water
treatments, into the potable water.
●
On Combi applications, circulators suitable for
DHW applications must be used.
●
Do not connect the water heater to any heating
systems or components that have been
previously used with non-potable water heaters.
●
If the system requires varying temperatures
for water—for example, hotter water for space
heating than for other uses—install a mixing
valve to temper the water and reduce the
potential for scalding.
●
Do not use the water heater for space heating
only.
●
Make sure circulator flow rate through the Water
Heater does not exceed 4 GPM.
Note
Do not configure the system for DHW
recirculation when it is configured to
run an air handler using the H2Air add-
on controller. DHW recirculation and
Navien H2Air configurations cannot be
used at the same time.
