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AP18733 REV. 3.2.17
45
Figure 24.1 – Standard(DHW) Mode
Internal Recirculation Mode allows the installer to program specic recirculation functions by day and time to circulate and heat water
more efciently - when the user most needs hot water. See Recirculation Functions, this manual, for details.
Mode Description
Return
Line
Installer Mode Setting
Hot Water
Speed
(To
Fixtures)
Energy
Usage
Default
Recirculation
Run Time
Recirculation
Setting
(6:RC)
Recirculation
Mode
(7:RM)
Standard
(Default)
Same as Standard Tankless
Water Heater
N/A OFF N/A Good Best -
Internal
Recirculation
Similar to Tank Water Heater
without Recirculation Loop
N/A ON Internal Better Better
5:00 ~ 8:00 AM
5:00 ~ 11:00 PM
External
Recirculation
Quicker Hot Water with
External Recirculation Loop
Required ON External Best Good
Table 20 – Detail of Recirculation Modes
* Cross-over kit is available for installations where dedicated return lines are not available.
Standard (DHW)
Mode – This is the
operating mode
when there is a call
for hot water.
External Recirculation
Mode – This mode keeps
an external recirculation
loop warm to make hot
water production more
efficient and also aid in
freeze protection. An
external recirculation line
must be installed in order
to recirculate water exter-
nally. The installer may
program specic recircula-
tion functions by day and
time to circulate and heat
water when the user most
needs hot water. See Re-
circulation Functions, this
manual, for details.
Preheat or Internal Recirculation Modes – When
calls for hot water are satised, the water heater is
factory programmed to Preheat and automatically
maintain the temperature set point of the water heat-
er – 24 hours a day, 7 days a week. The differential
setting can be adjusted to control the temperature
set point.
Figure 24.2 – External Recirculation Mode
Figure 24.3 – Preheat or Inernal Recirculation Mode
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