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CAUTION
Do not remove the front cover unless the power to the
water heater is turned off or disconnected. Failure to do
so may result in electric shock.
Configure only the DIP switches that require adjustment
according to the instructions in this manual. Do not adjust
any other DIP switches.
When using external recirculation mode with the
Note
built-in pump, observe the following maximum
recirculation pipe lengths including fittings (
is recommended):
1
-
/
in Copper Pipe- 100 ft (30 m) of equivalent length
2
3
-
/
in Copper Pipe- 500 ft (150 m) of equivalent length
4
Lengths in excess of these limits will require an
external recirculation pump.
Internal Recirculation Mode
To use the internal recirculation mode:
1. Connect the water supply.
2. Set the 2-way valve inside the water heater to "INT. "
3. Set the front panel DIP switches at the far left (set of ten) to:
1—ON; 2—OFF.
3
/
in pipe
4
CAUTION
Do not remove recirculation cap. (Internal Recirculation Mode)
The following diagram shows the internal recirculation flow for
pre-heating:
Buffer
Tank
2-Way
Valve
Open
Hot Water
Supply
ON
ON
1
2
3
4
5
6
7
8
9
10
Primary Heat Exchanger
Secondary Heat Exchanger
Circulation
Check
Pump
Valve
Water
Adjustment
Valve
Internal Recirculation Mode
Installing the Water Heater
Flow
Sensor
Domestic Water
Supply
25
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