Utilising line of credit

Hi, I currently have three rental properties along with a fourth property I live in. All the properties are owned by a trust. I have a revolving credit facility which is linked to the house (mortgage wise) I'm living in, all rents get paid into this account too. The revolving credit facility has a limit of $49,000 of which $35,000 is personal money I have put into this account to offset mortgage payments for the house I'm living in. The rest ($20,000) is money owned by the trust account. I have also recently refinanced one of my rental property loans with a different bank and set up a revolving credit there also purely from the equity in that property alone. This has created $60,000 in money. If I have to spend money on a rental property (like for a hot water cylinder), can I use the money from the second revolving credit facility rather than the first one? I would like to keep my personal mortgage payments lower. From a tax perspective?