Use and Care Manual

mrcool.com
Indoor Unit Installation
Page 22
Step 2: Cut a Ceiling Hole using Template
If your installation location has exposed ceiling
joists or is a new construction build, please skip to
step 3. If your installation location has a finished
ceiling, you must cut a hole in the drywall between
two ceiling joists, using the included cardboard
template as guide (refer to Fig. 5.4).
1. Using a stud finder, locate two ceiling joists at
the selected installation location the unit will be
mounted in between.
2. Once the ceiling joists have been located, lightly
mark their location using a pencil or scribe.
Then, take measurements of the distance
between the joists and ensure they meet what is
required to install the unit.
3. Then, using the cardboard template included
with the unit, hold it against the ceiling. Ensure
the center of the template is centered between
the two ceiling joists. Then, lightly sketch around
the template using a pencil or scribe to create a
guide of where the hole is to be cut. The
dimensions of the ceiling hole are 16.9 in x 51.2
in (430 mm x 1300 mm).
4. Now, using a utility knife score the outline sketch
of the template you created. Scoring the outline
will create a guide to follow making it easier to
make clean, straight cuts into the ceiling
sheetrock when creating the ceiling hole.
5. Then, carefully cut the drywall around the
scored outline. The preferred method of cutting
the drywall is by using a spiral saw or an
oscillating multi-tool with an attachment blade
for cutting drywall. These tools are designed for
cutting through drywall quickly and also allow you
to easily control the depth of your cut. This hole
can also be cut by simply using the utility knife
you used to score the drywall. In order to use this
method, continue making deeper passes in each
of the scored lines around the outline until you
break through the layer of drywall on each side.
6. Now, carefully break away and remove the
drywall from the ceiling around the cut lines. The
small areas of drywall that will expose the base of
the ceiling joists may take some work to remove,
as the drywall will be nailed or screwed to the
joists in these areas. NOTE: Any nails or
screws that are exposed in the base of the
ceiling joists during the removal of the
drywall will need to be removed to ensure
the cassette will have a flat surface to
mount against.
7. Remove or readjust any insulation or
obstructions above the ceiling hole that might
prevent the cassette from being installed.
8. Take measurements of the space above the
ceiling hole and ensure the available space meets
all of the dimensional and clearance
requirements needed for the cassette installation
as shown in Fig. 5.2 & 5.3 on the previous page.
• When cutting the ceiling hole, be sure to
wear a face mask and safety glasses to
avoid consuming the dust particles that will
be created.
• When cutting the ceiling hole, be sure to
avoid any electrical wiring, plumbing, nails,
screws, or other sensitive components.
• Be sure to have someone else or some way
to support the piece you are cutting as it
breaks free from the ceiling.
• Be sure to cover the flooring beneath
where the hole is being cut to catch any
falling dust and debris.
CAUTION
NOTE ON TEXTURED CEILINGS
If the installation location has a textured
ceiling it may be difficult to locate the joists
using the stud finder. If so, take a small
square of cardboard and hold it flat against
the ceiling at the installation location. Then,
run the stud finder across the cardboard.
This will allow for a smooth surface in order
to properly locate the ceiling joists.
IMPORTANT:
Ensure the distance between the joists
meets the dimensional and clearance
requirements for the cassette, as shown on
the previous page before proceeding to the
next step.
16.9 in
(430 mm)
51.2 in (1300 mm)
Fig. 5.4