Instructions / Assembly

AP18733 REV. 3.2.17
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Index Default Parameter Description
12:Cn
oFF Cascade
Enables Cascade Mode on the water heater.
Range: on – Cascade is used, oFF – Cascade is not used
13:Eh
on Common Vent
NOTE: 12:Cn must be set to On to select 13:Eh
Enables Common Venting on the water heater.
Range: on – Common Venting is used,
oFF – Common Venting is not used
14:T1
oFF Test Mode 1
Used to test the water heater when operating in Internal Recirculation Mode only.
The water heater may operate while Test Mode 2 is operating.
Range: on, oFF
15:T2
oFF Test Mode 2
Used to purge air from the water heating system with an external recirculation pump.
The water heater does not need to operate while Test Mode 2 is operating.
Range: on, oFF
Table 26 – Installer Mode Descriptions
Toggle through displayed items by turning the dial .
To change an item, press the Dial button .
Displayed items can be changed by turning the dial counterclockwise to lower, and clockwise to raise, the displayed value.
To save settings, press the Dial button again.
To leave Installer Mode, press button again. The water heater will return to power off mode.
▪ H. USING RECIRCULATION MODES – STEP 1
The following section explains and details the use of the Internal / External Recirculation Modes.
Preheat or Internal Recirculation Modes – When calls for hot water are satised, the water heater is factory programmed to Preheat and au-
tomatically 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 specic recirculation functions by day and time to circulate and heat water more ef-
ciently - 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 efcient and also aid
in freeze protection. An external recirculation line must be installed in order to recirculate water externally. The installer may program specic re-
circulation 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. Installer Mode will activate when is pressed and held for ve seconds while the water heater display is powered Off.
2. Turn the dial to 6:RC. Press the Dial button . “oFF” will ash when the 6:RC setting is ready to be changed.
3. Turn the dial to “oFF” to turn off the Recirculation Pump, or “on” to turn the Recirculation Pump on.
Press the dial button to select the setting and return to the Installer Mode.
Figure 39 –6:RC - Recirculation Pump Operation