Can a HELOC be used on a future primary home as a down payment?

[Chance Love]

I've lived in my primary home for 10+ years that has a great amount of equity and I'm considering doing a HELOC and turning my current primary home into a rental which will produce great monthly cash flow based on the current market. My goal is to pull 20% for my next home from my current primary since I'd like to downsize and use that towards my future primary residence as a down payment. Is a HELOC typically accepted or not as a down payment for a primary home or is it case by case? Thanks in advance!

[Justin Phillips]

@Chance Love Seasoning is essentially where you draw the funds from your Heloc and sit them in a traditional bank account. When your next lender asks for two months of bank statements, those deposits will be "seasoned" so they won't see it coming from your Heloc. 
The ZBA loan is definitely the most efficient way to do it. I have it set-up on my rental. Currently with the market being so hot, I'm just building up capital to deploy when things shift. When the turn comes, I'll start writing checks out of my line for investment purchases.
I know people that have used their one loan/line to purchase and pay off a ton of different properties.