I'm wanting to make sure my shopping list is correct for my mini split install. 

The mini split, Senville SENA-09HF, uses a 12/3 wire and requires a 15 amp breaker. I'm planning to buy a non-fused disconnect box and an electrical whip, but 12 gauge whips seem to be uncommon. 

**Would I be safe to use a 10 gauge whip off of the disconnect box to the outdoor condenser unit?** 

I could feed my own 12/3 through the conduit but first wanted to know if there's even a need to. My intuition tells me this would be fine but this wouldn't be the first time it's failed me. Thanks in advanced for any and all help!