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The best air conditioners allow for built-in safety measures to ensure no one gets shocked during repairs. To that end, we’re going to show you how to wire a disconnect box for an air conditioner. And for more HVAC-related material, we have great articles that discuss leaving an air conditioner on while not at home, how to unlock the A/C thermostat, how to unclog an air conditioner drain pipe, and why the lights dim when the air conditioner comes on.
An air conditioner disconnect box is a safety measure that breaks the flow of electrical current in a given circuit. Before conducting repairs or tests on a central AC unit, owners and maintenance specialists install disconnect boxes to ensure that the power is completely off. For more tips on air conditioner maintenance and projects, you can read our article on how to winterize an air conditioner.
When sealing your AC disconnect box, seal the top but not the bottom. If any water gets trapped inside, it will drain out instead of stagnating.
Don’t use a metal disconnect box unless you live in an arid area, as metal disconnect boxes are known to rust quickly.
How to clean your air conditioning filter?
Central air units usually have to have filters replaced rather than cleaned. But, if you have a portable or window unit, these come with filters that should be washed or vacuumed every 2-3 months.
How do you check fuses on a disconnected block?
For this test, you’ll need a multimeter. Set the multimeter to the lowest ohms scale and place the ends of the red and black leads onto either end of the fuse. The fuse is good if a number shows up rather than a zero or minus/infinity symbol.
You will need to purchase a new disposable filter for central air conditioners. For window and portable units, these will either be washable or vacuumable.
STAT: Installing an AC disconnect box is a project that will cost around $200-$400. (source)