I'm not sure from your description where your traps are but remember that during the winter the air handler is not producing condensate and your trap can dry out. That will allow septic gasses up into the air handler. Not a huge deal if you remember to fill the trap from time to time but it is not allowed by code for just this reason.
As to any effect on your drain field. I'm not sure but it doesn't seem like much extra water for a modern field to handle on a daily basis.
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You'll have to excuse me but I'm running a carbon deficit today.
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