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14.
Trial Operation
• Preparation ........... (1) Open the gas supply valve.
The boiler sets the output temperature to
NO
*1 When "Priority1" and "Priority2" both call for heat, the boiler gives priority to the "Priority 1" circuit.
*2 If the unit does not directly supply power to the circulator, an external control capable of providing a pump
shut-off delay of 20 seconds or more must be used. Damage will occur to the boiler if the circulator
shuts-off too soon after the burner shuts off.
When the boiler provides power directly to the circulator, it automatically allows the circulator to run for
approximately 20 seconds after the burner shuts off.
*3 A flow rate of 2.5 GPM or more is required to activate the water flow switch. If the water flow switch is not
turned on for a continuous 60 seconds, boiler operation is stopped.
･ Error message "113" may be displayed at first until the air is bled from the gas piping.
If error message "113" is displayed, set the POWER switch to the off position, then set it back to the on position.
* White smoke may be noticed from the exhaust vent during cold weather. However, this is not a malfunction of the unit.
･ If the boiler does not operate normally, refer to "Troubleshooting" in the user's information manual.
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(2) Turn on the power supply.
Priority1 (Indirect tank) operation
Operation stops ( *2)
Remote controller
NO
"Power" switch
is turned on.
YES
"Priority1"
NO
calls for heat (*1)
YES
Power is supplied to the
"Priority1" circulator.
NO
Water flow switch
is turned on. (*3)
YES
The water temperature
NO
is below the combustion
start temperature.
YES
The boiler is activated.
the "Priority 1" setting.
The water temperature
is more than the combustion
stop temperature.
YES
Burner operation stops
The installer should test operate the unit, explain to
the customer how to use the unit, and give the owner
this manual before leaving the installation.
Priority2 (Heating) operation
Remote controller
"Power" switch
is turned on.
YES
"Priority2"
calls for heat (*1)
YES
Power is supplied to the
"Priority2" circulator.
Water flow switch
is turned on. ( *3)
YES
The water temperature
is below the combustion
start temperature.
YES
The boiler is activated.
The boiler sets the output temperature to
the "Priority 2" setting.
The water temperature
NO
is more than the combustion
stop temperature.
YES
Burner operation stops
Operation stops ( *2)
NO
NO
NO
NO
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