Installation
Indoor Unit Installation
Typical Installation
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.
Indoor Unit Installation
Positioning for mounting cassette unit
Step 1
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.
Indoor Unit Installation
Positioning for mounting cassette unit
Step 2
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.
Indoor Unit Installation
Installing cassette unit
Step 1
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.
Indoor Unit Installation
Installing cassette unit
Step 2
Check and adjust the unit for proper height according
to the installation guide and verify unit is level.
Indoor Unit Installation
Installing cassette unit
Step 3
Tighten all nuts on the downrods. Make sure to lock
the double-nuts together at all 8 locations on the
downrods.
Indoor Unit Installation
Drilling a hole in the wall to install the piping
Step 1
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.
Indoor Unit Installation
Drilling a hole in the wall to install the piping
Step 2
Insert a sleeve into the hole to prevent the connection
piping and wiring from being damaged while being
inserted through the hole.
Indoor Unit Installation
Drilling a hole in the wall to install the piping
Step 3
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.
Indoor Unit Installation
Installing the water drain pipe
Step 1
Attach the flexible drain pipe coupling to the
condensate pump drain port using the supplied clamp.
Indoor Unit Installation
Installing the water drain pipe
Step 2
Insulate the connection with the supplied gray
insulating material.
Indoor Unit Installation
Installing the water drain pipe
Step 3
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.
Indoor Unit Installation
Installing the water drain pipe
Step 4
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.)
Indoor Unit Installation
Installing the water drain pipe
Step 5
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.
Indoor Unit Installation
Installing the water drain pipe
Step 6
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.
Indoor Unit Installation
Installing the connection pipes
A flaring kit may be necessary for
the installation of the lineset.
Indoor Unit Installation
Installing the connection pipes
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.
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.
Indoor Unit Installation
Installing indoor unit wiring
Step 1
Remove the two screws and cover plate, revealing
the main PC board and terminal block.
Indoor Unit Installation
Installing indoor unit wiring
Step 2
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.
Indoor Unit Installation
Installing indoor unit wiring
Step 3
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.
Indoor Unit Installation
Installing indoor unit wiring
Step 4
The electric wire must be tightened securely with the
wire restraining clip.
Indoor Unit Installation
Installing indoor unit wiring
Step 5
Reattach the cover plate to the electric box.
Indoor Unit Installation
Installing indoor unit cover panel
Step 1
Remove the two retaining screws from the cover filter
panel release tabs.
Indoor Unit Installation
Installing indoor unit cover panel
Step 2
Slide the two release tabs toward the center of the
cover panel. Remove the center filter panel.
Indoor Unit Installation
Installing indoor unit cover panel
Step 3
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.)
Indoor Unit Installation
Installing indoor unit cover panel
Step 4
Screw the cover panel onto the cassette unit using four
screws.
Indoor Unit Installation
Installing indoor unit cover panel
Step 5
Plug the wiring harness connectors together.
Indoor Unit Installation
Installing indoor unit cover panel
Step 6
Reinstall the filter cover and replace the retaining
screws.
Indoor Unit Installation
Installing indoor unit cover panel
Step 7
Perform final inspection of the cassette indoor unit
making sure all mounts are secure.