Funding personal investment account from business LLC checking

[Eric W.]

I've got one rental home and have it held in a single member LLC. My LLC business checking account is growing and I'd like to put that money to use by linking my LLC checking account to my Vanguard personal investment account. I've never spent any of my rental income in that LLC account aside from paying my taxes. My plan is to setup monthly automatic transfers and use a dollar/cost averaging (DCA) strategy in my taxable Vanguard portfolio. I want to ensure that I don't expose myself to unnecessary liability by commingling funds. Would it be ok to link these two accounts via ACH transfer agreement? How should I annotate that transfer? Any specific advice on what to do or not to do?

Thanks in advance!