Minisplit Installation on an Interior Wall

A level layout line marks the location for the bracket on which the minisplit’s indoor head unit will hang. Before the drywall was installed, blocking was added to the wall framing for support.

The author traces around the knock-out for the unit’s through-wall penentrations ...

... and cuts the drywall before installing the bracket.

The indoor head of the minisplit hangs on a mounting plate and bracket.

The line set (insulated with black foam insulation) and 4-conductor wire is laid through the open joist floor system.

The insulated line-set tubing is fed through holes in the top plates on its way down the sidewall and eventually to the exterior of the house.

To curb air leaks where the line set passes through sheathing, it’s wrapped with Siga Rissan tape. Scuff marks and tears on the foam insulation will be repaired with duct tape.

The outside compressor is mounted on a wall bracket, with the sub-panel on the right. The line set and 4-conductor wire pass through a sleeve to the interior. Before bracket installation, the author applied bituminous membrane to the sheathing and exterior trim to accommodate the finish siding.

The flexible condensate drain is run inside a diagonal 1 1/2-inch PVC pipe that empties into the DWV line. Note the P trap. Slack in the line set and wire allows maintenance or repair of the head without crimping the copper tubing.

The tech tops off the lines with R410A refrigerant.

Inside, the tech tests the minisplit’s operation. He’ll run it in both heating and cooling modes before he leaves.

During commissioning, gauges are hooked up to the compressor to monitor evacuation and add R410A refrigerant. Here the tech prepares the 4-conductor wire that runs to the indoor head.

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