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ManualsBrandsWestinghouse ManualsPlumbing8.2 GPM High Efficiency Natural Gas Tankless Water Heater with Built-in Recirculation and Pump
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WHL-590 REV. 7.27.16
18: dt
0
Delay time from DHW Mode
Range: 0 – 2 minutes
Display
Default
Detail
Description
19:SU
Cd
Solenoid Valve Operation
Cd – Comfort Mode. When this mode is active the solenoid valve energizes
when the water heater is over 90% of the capacity, and deactivate when water
heater is less than 50% of the capacity. This can be used in combination with a
combi boiler to increase the domestic hot water production of the system.
AH – Air Handler Mode – This mode must be active when using an Air Handler
application. The pump will operate for 60 seconds every 6 hours if there was
not a call for heat to sanitize recirculation water.
Range: Cd – AH, Default: Cd
NOTE: If AH is not selected when using an air handler T/T will not operate.
Table 25 – 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.
Figure 46 – Recirculation Modes
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