Before anything else turn off the heat pump and then cut off the power from safety switch or from fuse.

If you install heat exchanger temperature sensor to the recommended position at *highest pipe*, only steps 1-7 (photos 1 and 2) needed.

Attach Heat Exchanger Temperature Sensor to the highest pipe with two/three zip ties.

Outdoor Temperature Sensor should be placed so it is covered, for example behind the outdoor unit

Junction box can be placed just under the outdoor unit. This gives you easy access.