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The following diagram shows the internal
recirculation flow for pre-heating:
Primary Heat Exchanger
Buffer
Tank
Check
2-Way
Valve
Valve
Open
Hot Water
Supply
[Internal Recirculation Mode]
External Recirculation Mode
To use the external recirculation mode:
1. Connect the water supply to support
recirculation. Refer to the Internal recirculation
mode diagram.
2. Set the 2-way valve inside the water heater to
"EXT. "
3. Set the front panel DIP switches at the far left
Flow
Sensor
Circulation
Pump
Water
Adjustment
Valve
The following diagram shows the external
recirculation flow for pre-heating:
Domestic Water
Supply
(set of ten) to 2-OFF and 3-ON.
Primary Heat Exchanger
Buffer
Tank
Check
2-Way
Valve
Valve
Closed
Hot
Recirculation
Water
Water Supply
Supply
[External Recirculation Mode]
Installing the Water Heater
OFF
ON
ON
1
2
3
4
5
6
7
8
9
10
Flow
Sensor
Circulation
Pump
Water
Adjustment
Valve
Domestic
Water
Supply
27
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