INS
TALLA
TION
On-Demand Water Heater Installation Manual and Owner’s Guide
37
INSTALLATION
Step 12:
Water connections
RECIRCULATION PUMP MODES:
The X3P water heater comes with an integrated recirculation pump. The water heater has 3 recirculation mode options;
Recirculation with a dedicated return line (default), On-Demand mode compliant with California’s Title 24, and Crossover recir-
culation mode. Details of the operation are listed below. In each mode, the heater’s pump only operates when there is not any
demand from the home’s fixtures. The water heater will stop the pump if there is a call for demand from one of the home’s
fixtures.
1.
Recirculation with a Dedicated Return Line (Default Mode)
-
In this mode, the water heater will operate the pump in
order to keep your water lines warm, reducing the time it takes for the hot water to arrive at the fixture. The user can con-
figure 2 Pump Timer ON periods where the heater will operate the pump. It is recommended to set the Pump Timers to ON
during times when the home is occupied. The water heater will operate as an on-demand water heater during Pump Timer
Off periods, though there may be a delay getting hot water to the fixture. See p. 60 to set the Pump Timers.
2.
On-Demand Mode -
In this mode, the pump will only activate when the user pushes the “Pump” button on the heat-
er’s built in controller or accessory remote controller. See p. 64 for additional information. This mode is compliant with
California’s Title 24.
3.
Crossover Valve Mode -
In this mode, a “crossover” valve is typically installed at the home’s furthest fixture. This valve
will use the home’s cold water line to act as the return line. The settings on the valve are dependent on the manufacturer.
For example the typical operation is as follows; the crossover valves have a type of thermal valve that will open up when the
water temperature on the hot side drops below 95°F
(35°C) and will close when the temperature reaches 105°F
(40.5°C).
NOTICE: These temperature values may vary from manufacturer to manufacturer. To set the water heater to this mode, you
must move the #5 DIP switch on the upper bank to the ON position. (See p. 39 for Crossover Valve Installation.) The water
heater will operate its pump. When it detects that the crossover valve is closed, it will stop the pump. By default, the heater
will check to see if the valve is opened 20 minutes after the last operation. If the valve is open, the heater will operate until
the valve closes. This time interval can be reduced to 10 minutes by moving the #3 DIP switch on the upper bank to the ON
position.
Summary of Contents for 160X3P
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