The outdoor part of your air conditioning system is known as the condenser unit. This unit is connected via lines to the evaporator inside your home. Condensers are heavy pieces of equipment that experience a good deal of vibration, which is why it's important that it have a solid base to sit on. This base is usually made of concrete and is either a pre-manufactured concrete pad or a concrete slab that you pour in place. The following will show you how to pour a slab for your A/C's condenser.
What You Will Need
2 x 4s
Step 1. Check your owner's manual to determine the size required for your air conditioner's condenser. If you can't find this information, a 5 x 5 concrete slab is usually sufficient.
Step 2. Use a shovel to remove the sod (if any) where you want to put the slab. Make sure you include an extra 6 inches in every direction to give yourself space to work in.
Step 3. Use a hammer and nails to assemble a concrete form made of 2 x 4s. The lumber you cut should be 3 inches longer than the intended size of the concrete pad.
Step 4. Position the form you made in the center of the excavated space. To help hold the form together when the heavy concrete is poured inside, drive a number of wooden stakes along the outside. Use a carpenters level to make sure that the form is perfectly level.
Step 5. Determine how much concrete you need to use. This is done by multiplying the length and width of the slab in inches by its thickness. For example, if you're going to have a 48 x 48 x 4 inch slab, this means you will need 9216 cubic inches of mixed concrete, which is equivalent to 0.2 cubic yards.
Step 6. Following the manufacturer's instructions, pour a bag of premixed concrete into a wheelbarrow and add water. Before you pour this into the form, make sure you have used a hoe to mix it for 20 minutes. Depending on the amount of concrete you need, you may have to use more than one bag.
Step 7. Once you have mixed it, pour the concrete into the form you built. Run a straight board across the surface of the poured concrete to level it.
Step 8. Use a trowel to further smooth out the concrete in order to produce a more professional appearance. Allow the concrete to dry completely (usually overnight) and then remove the wooden form. Add soil back in around the edges of your new pad. Talk to a professional like Long Beach Heating & Air Conditioning Inc for assistance.