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Aquahot controller technical question

January 02, 2024, 10:37:41 pm

First let me say, there is nothing wrong with my system. I was reading the AH technical service manual to learn more about the system, and had a question about a certain possible interlock the controller might or might not  have. (ref page 68 DC voltage checks and low voltage)

IF the supply voltage for the controller drops below 11.5 volts (Pin B4), will the controller stop the system from running?

As the manual instructs on how to check for low voltage or in turn low RPM related to low voltage. I am assuming the controller has no way of stopping the unit from running at any voltage.....But would like to know.


My system, AHE-100-02S

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Re: Aquahot controller technical question

Reply #1 – January 03, 2024, 08:05:48 am

The Control Unit that runs the burner looks at the voltage from the flame sensor to determine there is a fire.  When the incoming voltage to the burner gets below 11.5, it is easy for the flame sensor voltage to go below 10 volts.  The control unit will determine the flame is not sustainable at voltages below 10 volts.  The control unit then faults, turns off the fuel, cools for 3 minutes and stops the burner till someone turns the burner off and back on to remove the fault.

Newer heaters have an electronic control board to run the heater.  It has a low voltage light that will stop the burner during low voltage conditions.  A micro switch must be pushed to turn the low voltage light off to restore operation.

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Re: Aquahot controller technical question

Reply #2 – January 03, 2024, 10:30:49 am

Rudy,

Thank you for the detailed explanation.

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