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How to Install a Split System Air Conditioner

Most people hire a professional to install a split system air conditioner. However, if you have some

experience with plumbing and electrical work, you can install the unit on your own. Each split system or

ductless air conditioner is unique to its manufacturer, but this article explains the general instructions

for installing a split system air conditioner.

1

Select an unobstructed location on your interior wall to mount the indoor air conditioning

unit.

Avoid direct sunlight and heat sources.

Avoid locations where gas may leak or where oil mist or sulphur exists.

The indoor unit requires at least 6" (15 cm) of open space surrounding its top and sides. The

unit should also be mounted at least 7 feet (2.13 m) above the ground.

Install the unit at least 3.3 feet (1 m) away from antenna, power or connecting lines that areused for television, radio, home security systems, intercoms or telephones. The electrical noise

from these sources could cause operational problems for your air conditioner.

The wall should be strong enough to hold the unit's weight. You may need to construct a wood

or metal frame to provide added support.2

Secure the mounting plate to the interior wall.

Hold the mounting plate against the wall where you want to install the indoor unit. Use a level to make sure the plate is both horizontally and vertically square.

Drill holes into the wall at the appropriate spots to affix the plate to the wall.

Insert plastic anchors into the holes. Secure the plate to the wall with tapping screws.3

Create a hole in the wall to fit the piping.

Find the best spot for the hole to the exterior based on the opening in the mounting bracket.You should also consider the length of the pipe and the distance that it needs to travel to reach

the outside unit.

Drill a hole that is 3" (7.5 cm) in diameter through the wall. The hole should slope downward

toward the exterior to ensure adequate drainage.

Insert a flexible flange into the hole.4

Check the electrical connections.

Lift the units front panel and remove the cover.

Be sure the cable wires are connected to the screw terminals. Also, make sure that they matchthe diagram that comes with the unit.

5

Connect the pipes.
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Run the piping from the indoor unit toward the hole drilled through the wall. Minimizebending to ensure that the unit performs well.

Cut a length of PVC pipe 1/4" (6 millimeters) shorter than the length between yourinterior and exterior wall surfaces.

Place the pipe cap on the interior end of the PVC pipe. Insert the pipe into the hole in thewall.

Bind the copper pipes, the power cables and the drain pipe together with electrical tape.Place the drain pipe on the bottom to ensure a free flow of water.

Secure the pipe to the indoor unit. Use 2 wrenches, working in opposite directions, totighten the connection.

Join the water drainage pipe to the indoor units base. Run the bound pipes and cables through the hole in the wall. Make sure that the drainage

pipe allows water to drain in an appropriate place.

6

Secure the indoor unit to the mounting plate by pressing the unit against the mounting

plate.

Install the Outdoor Condenser

1. 1Choose the best place to install the outdoor unit.

The outdoor units location needs to be away from any heavily trafficked, dusty or hotareas.

The outdoor unit needs 12" of space surrounding its perimeter to ensure properfunctioning.

2

Lay the concrete pad on the ground and make sure that it is level. The pad should be high

enough so that the condenser will sit above the level of winter snows.

Set the outdoor condenser on top of the pad. Use rubber cushioning under the unit'sfeet to minimize vibration.

Make sure that no antenna of a radio or television is within 10 feet (3 meters) of theoutdoor condenser.

3Connect the electrical wires.

Remove the cover. Refer to the units wiring diagram and make sure the cable wires are connected as the

diagram suggests. Following the manufacturer's instructions for wiring is crucial.

Fasten the cables with a cable clamp and replace the cover.


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4

Secure the pipes flare nuts to the corresponding pipes on the outdoor unit .

Complete the Split System Air Conditioner Installation

1. 1Bleed the air and humidity from the refrigerant circuit.

Remove the caps from the 2-way and 3-way valves and from the service port. Connect a vacuum pump hose to the service port. Turn the vacuum on until it reaches an absolute vacuum of 10mm Hg. Close the low pressure knob and then turn off the vacuum. Test all of the valves and joints for leaks. Disconnect the vacuum. Replace the service port and caps.

2

Wrap the joints of the piping with insulating covering and insulating tape .

3

Affix the piping to the wall with clamps.4

Seal up the hole in the wall using expanding polyurethane foam.

Tips

Don't skip the step of insulating the tubing that runs between the indoor and outdoor units. Incase the drainage pipe sweats, the insulation will prevent damage to your wall or studs.

Provide a dedicated power outlet for your air conditioner. Always follow the manufacturer's instructions that come with your split system air conditioner

when you're installing the unit in your home or office.

Follow all municipal codes for electrical wiring and other aspects of installation. Some split system air conditioner manufacturers void the units warranty if it is not

installed by a licensed tradesman.

Do not allow any wiring to touch the compressor, refrigerant tubing or any moving fanparts.

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