Indoor Unit Installation Installation Procedures Indoor Unit Adequate Support! Building structure must be adequate to support the weight of the unit. Failure to ensure adequate structural support could result in unit falling from its location which could result in death, serious injury, or equipment or property-only damage. 1.Avoid locating the indoor unit where the return and/or supply air may be obstructed. 2.Select a location where it is easy to drain the condensing water and connect to the outdoor unit. 3.Keep the indoor unit far away from heat sources, vapor and flammable gas. 4.Be sure that the installation of the indoor unit conforms to the installation dimension diagram. 5.Be sure to leave enough space to allow access for routine maintenance. 6.Install in a location where the unit is more than 3 feet away from other electric appliances such as television, audio devices etc. 7.Select location where air filters can be easily removed.
Positioning for mounting cassette unit Step 1 Indoor Unit Installation Select a ceiling location suitable for the installation of the indoor unit. (Refer to the installation manual for location and dimension spacing.) Locate building support members sufficient to hold 4 times the weight of the unit being installed. Mark the location for the support brackets / downrods.
Positioning for mounting cassette unit Step 2 Indoor Unit Installation Mount the support brackets, downrods and nuts. (Field supplied.) Double-nut the top of each bracket. Be sure that the brackets / downrods have been fixed firmly enough to withstand 4 times the weight of the unit, furthermore, the weight should be evenly shared by each downrod. Install the nuts and washers on the lower ends of the downrods with enough spacing to allow the cassette unit brackets to slide between the sets of washers. Double-nut the bottom nuts.
Installing cassette unit Step 1 Indoor Unit Installation Raise the cassette unit into position, placing the downrods in the bracket slots of the cassette unit. Hand tighten the nuts so that the downrods will not come loose from the brackets.
Installing cassette unit Step 2 Indoor Unit Installation Check and adjust the unit for proper height according to the installation guide and verify unit is level.
Installing cassette unit Step 3 Indoor Unit Installation Tighten all nuts on the downrods. Make sure to lock the double-nuts together at all 8 locations on the downrods.
Drilling a hole in the wall to install the piping Step 1 Indoor Unit Installation Find the location on the exterior wall where the piping and wiring will exit the building. Drill a 2 ½” diameter hole at a slight downward angle from the inside wall towards the outdoor wall so that the outside hole is a ¼” lower than the hole on the in side.
Drilling a hole in the wall to install the piping Step 2 Indoor Unit Installation Insert a sleeve into the hole to prevent the connection piping and wiring from being damaged while being inserted through the hole.
Drilling a hole in the wall to install the piping Step 3 Indoor Unit Installation Pass the piping and wires through the hole using caution to ensure tubing, wiring and insulation is not kinked or damaged. Insulate the piping hole both inside and out after the piping connections have been completed at the indoor and outdoor units. Note: Image for illustration purposes only. The entire drain line tubing must be wrapped to prevent moisture from cool condensate coming in contact with and damaging the ceiling or wall.
Installing the water drain pipe Step 1 Indoor Unit Installation Attach the flexible drain pipe coupling to the condensate pump drain port using the supplied clamp.
Installing the water drain pipe Step 2 Indoor Unit Installation Insulate the connection with the supplied gray insulating material.
Installing the water drain pipe Step 3 Indoor Unit Installation Attach the condensate drain pipe to the flexible drain pipe coupling. The diameter of the condensate drain pipe should be equal to or larger than the flexible drain pipe coupling. Support the drain pipe to avoid drooping or sagging of the line. Support the pipe every 39.4 - 59 inches as needed.
Installing the water drain pipe Step 4 Indoor Unit Installation Should the pipe slope between the cassette unit and the wall exit hole point be insufficient, the pipe may be raised to allow for proper drainage. The raised pipe height should form a right angle to the unit and be less than 11 inches. (See diagram.)
Installing the water drain pipe Step 5 Indoor Unit Installation The slant gradient of the flexible drain pipe coupling should be below 2.9 inches so that the drain hole fitting of the cassette unit does not have unnecessary force applied to it.
Installing the water drain pipe Step 6 Indoor Unit Installation Refer to the above diagram when installing multiple indoor units with a common drain line. Check for proper drainage after completion of the drain pipe installation.
Installing the connection pipes Indoor Unit Installation A flaring kit may be necessary for the installation of the lineset.
Installing the connection pipes Indoor Unit Installation Note: First connect the connection pipe to the indoor unit and then to the outdoor unit. Pay attention to the pipe bending. Be sure to not damage the connection pipe. To avoid leakage be sure not to over-tighten the joint nut. Note: Refrigerant lines should be separately insulated. Once the piping has been connected to the outdoor unit and a leak test has been performed, slide the insulation over the joints to completely insulate the connections. Step 1 Align the center of the piping flare with the relevant fitting. Screw in the flare nuts by hand and then tighten the nuts with a spanner and torque wrench. Refer to the chart for proper torque.
Installing indoor unit wiring Step 1 Indoor Unit Installation Remove the two screws and cover plate, revealing the main PC board and terminal block.
Installing indoor unit wiring Step 2 Indoor Unit Installation The cassette unit is capable of using a wired remote. If installing this option, feed one end of the remote’s wire into the electric box through one of the wiring grommets located on the side of the enclosure. Plug the wire into connector C9.
Installing indoor unit wiring Step 3 Indoor Unit Installation Firmly attach the power connection cables to the terminal block in the indoor unit, making certain to observe the proper terminal connections as shown on the unit wiring diagram. Note: In addition to the outdoor breaker/fuse disconnect, a breaker or fuse is required for each indoor unit. The installation must be done in accordance with National, State, and/or local codes.
Installing indoor unit wiring Step 4 Indoor Unit Installation The electric wire must be tightened securely with the wire restraining clip.
Installing indoor unit wiring Step 5 Indoor Unit Installation Reattach the cover plate to the electric box.
Installing indoor unit cover panel Step 1 Indoor Unit Installation Remove the two retaining screws from the cover filter panel release tabs.
Installing indoor unit cover panel Step 2 Indoor Unit Installation Slide the two release tabs toward the center of the cover panel. Remove the center filter panel.
Installing indoor unit cover panel Step 3 Indoor Unit Installation Place the cover panel on the cassette unit noting the position of the louver motors and the wiring harness. (The cassette unit has recessed areas where the louver motors fit.)
Installing indoor unit cover panel Step 4 Indoor Unit Installation Screw the cover panel onto the cassette unit using four screws.
Installing indoor unit cover panel Step 5 Indoor Unit Installation Plug the wiring harness connectors together.
Installing indoor unit cover panel Step 6 Indoor Unit Installation Reinstall the filter cover and replace the retaining screws.
Installing indoor unit cover panel Step 7 Indoor Unit Installation Perform final inspection of the cassette indoor unit making sure all mounts are secure.