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I'm replacing my gas furnace with a ac/heater unit that uses 240 voltage and want to know how many volts my furnace uses

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If it's a 240 volt system, the maximum voltage required is 240 volts. Which would be what the furnace needs/uses to operate properly. But, I suspect what you really wanted to know is what is the amperage that's used/required. In most installations, it requires to 60 amp circuit breakers. However, yours may require less or more. Check the installation manual for more specific requirements.

Posted on Apr 04, 2011

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I am concerned of the readings you have given. 120 volts to ground, but 168 volts to neutral? And having 10 amps of current at the "ventor", but only 1 amp for the whole furnace worries me, because power for the "ventor" comes through the furnace.

You should not have 168 volts to anything! Unless somehow 240 volts is feeding the system, and there is a medium resistance short somewhere.

The controller boards are sensitive to AC polarity (if you will). Neutral should be tied to neutral on the board. You can check that by testing for voltage between the neutral terminal and chassis ground (assuming the chassis is properly grounded.). The hot leg of incoming power, which should be 120 volts, should be connected to the terminal that says 120 VAC.

If your getting 168 volts AC somehow, then something is wrong, and you need to disconnect power from this unit until you find the cause.

As a heat-A/C tech, you should know the sequence of operation for all furnaces is pretty much the same. The boards, while manufactured by different manufacturers, all operate pretty much the same way.

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