We have a wood-frame house with 2x4 studs and half-inch plywood exterior walls. What is the generally accepted best practices for mounting a 80lb mini split condenser on a wall bracket to this type of wall?
The advice on the Internet appears to center around getting it on the studs. Unfortunately, due to installation location constraints, it turns out we couldn't get the unit to sit directly on studs.
There are three bolts on each bracket, and they're 3/8" diameter. They were screwed in tightly into the plywood and hold the machine up. Based on charts of plywood pull out strengths online, it appears that there is enough safety margin with this setup.
The question I have is whether or not this is generally considered an acceptable install, and if not, what steps can be taken to upgrade the mounting. Perhaps extra wood supports to bridge the unit over to studs? Worst comes to worst maybe the unit may need to be remounted, but this is difficult.
What is the best course of action in this case?