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Based on the info and photos so far I'm going to take a (possibly premature) stab at a concise answer. Don't touch the power cables. You can totally avoid having anything to do with 240V circuitry and achieve the safe and non-invasive solution you want. Get a 5V relay board like the red one in your initial Question. A 2-channel one, not a 4-channel one. ...


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The four diagrams in your question from other vendors are for units that employ a 240V selector switch as a control. Judging by the manual for your unit in your question, your unit does not have such a switch! Also, unlike the other vendors in your question, your unit does not have a remote so my comments about that are irrelevant. You seem to have a ...


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You could cover them with panels secured with toggle bolts. If you decide to uncover them in the future you'll lose the toggles in the wall, but that shouldn't be a problem. The panels can be as simple or complex as you care for. Thin plywood would suffice to block most airflow. Opaque Perspex with an EPDM gasket around the edge would be moisture resistant ...


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