① Wall requirements: solid brick or concrete walls can be mounted directly; hollow brick or insulation-layer walls require through-wall tie bolts for reinforcement.

② Installation height: the bottom of the outdoor unit should be at least 2.5m above ground and no lower than the top of the window — for easy maintenance and to avoid pedestrian collisions.

③ Levelness: left-right level error should be under 5mm; the drainage side of the outdoor unit can be 3–5mm lower.

④ Bolt selection: use M10 or larger stainless expansion bolts, at least 2 per side; wooden plugs are strictly prohibited.

⑤ Regular inspection: check rust and bolt tightness once a year; severely rusted brackets must be replaced immediately.