lp-672 Rev. 000 Rel. 002 Date 10.3.18
45
Preheat or Internal Recirculation Modes –
When calls for hot water are satisfied, the water heater is factory programmed to Preheat and
automatically maintain the temperature set point of the water heater – 24 hours a day, 7 days a week. The differential setting can be adjusted
to control the temperature set point.
Internal Recirculation Mode allows the installer to program specific recirculation functions by day and time to circulate and heat water more
efficiently - when the user most needs hot water. See Recirculation Functions, this manual, for details.
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 externally. The installer may program
specific recirculation functions by day and time to circulate and heat water when the user most needs hot water. See Recirculation Functions,
this manual, for details.
To set Recirculation Modes:
1. Activate Installer Mode. While the water heater display is powered off, press and hold
for five seconds.
2. Turn the dial to O:RC. Press the Dial button
. “
” will flash when the O:RC setting is ready to be changed.
3. Turn the dial to select “
” to shut off Recirculation Mode, “
” to use Title 24 Mode, “
” to use Internal Recirculation, “
” to use External Recirculation, or “
” to turn on Preheat Mode. Press the dial button
to select the setting and return to the
Installer Mode.
Figure 52 - Internal / External Recirculation Mode Screens
Setting
Detail
Description
(Factory Default)
Recirculation Mode Off
Turns off Recirculation Pumps and Preheat Mode
Title 24 Mode
Turns on Title 24 Mode
Preheat Mode
Turns on Preheat Mode
Internal Recirculation Mode
Turns on Internal Recirculation
External Recirculation Mode
Turns on External Recirculation
Table 24 - Internal / External Recirculation Mode Overview
4. When finished, press
to exit this menu and turn power back on. Proceed to Step 2 to program recirculation functions.
NOTE:
It is recommended to have Preheat Mode on for faster hot water delivery.
NOTE:
The Recirculation Functions below do not refer to the “
” or “
” settings. In the
setting, the water heater
automatically turns on and meets the DHW setpoint temperature when the internal temperature falls below the differential setting (15: So).
J. Recirculation Functions - Using Recirculation Modes - Step 2
Internal and External Recirculation Modes
The following section details the
(Internal Recirculation Mode) and
(External Recirculation Mode) Recirculation Functions.
NOTE:
When External Recirculation Mode is active and there is no hot water demand, DHW temperature is limited to 125
o
F (51
o
C). This is
intended to decrease the risk of scalding. The water heater will heat water to temperatures greater than 125
o
F (51
o
C) if the DHW set-point is
higher than 125
o
F (51
o
C) and there is a demand for hot water.
Before setting the Recirculation Function, go into the Installer Mode and change 0: RC from
to
(Title 24 Mode),
(Internal Recirculation Mode), or
(External Recirculation Mode). Recirculation Mode will not work if it is not activated in Installer
Mode. See Tables 24 and 25 for details.
Title 24 Mode
NOTE:
An optional On Demand Recirculation kit is required to use Title 24 Mode. A push button switch or motion sensor is required to activate
recirculation, and an external pipe sensor may be used to monitor recirculation loop temperature.
Install the optional Title 24 Mode kit according to the included instructions. Then turn on the water heater. Enter Installer Mode, 0:RC, and
choose
, Title 24 Mode. Then enter Status Display Mode, O:tt, and set the system recirculation temperature.
