Navien NHW700 Installation Manual page 29

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.
Do not configure the system for DHW
Note
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.
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
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
Set the
maximum
Pump Cycle time for pump
12. P12
Interval operation or
on-demand
operation.
Pump
Set the pump
14. P14 Sampling
cycle ON interval.
Time
Set the offset
temperature
to turn off the
Differential preheating
15. P15
OFF Temp operation
(function
disabled with
HotButton Kit).
Activate for use
Thermal
with NaviCirc
17. P17 Bypass Valve
recirculation
Enable
valve.
Display
Display