Installing The Drain Piping; Checking The Drainage; 2-Way Cassette Type (L1 Type); Preparation For Suspending - Panasonic S-28MD1E5 Instructions D'installation

(4) The indoor unit should be suspended from the suspension
bolts (Fig. 3-7) so that the distance between the bottom of
the suspension lug and the bottom surface of the ceiling is
17 to 22 mm. (Fig. 3-6) Clearance between the indoor unit
and the bottom surface of the ceiling is adjustable after the
ceiling panel is attached to the unit.
Full-scale installation diagram
(printed on the package)
Suspension
bracket
15 mm or more
17 – 22 mm
Fig. 3-6
Suspension bolt
Nuts and washers
(Used above and below.)
Double nuts
Notch
15 mm or more
17 – 22 mm
Fig. 3-7
Use gauges A and B to adjust the height of the indoor unit.
(Gauges shown in Table 1-2.)
(5) The unit should be adjusted using water level or as shown
in Fig. 3-8 so that the drain pipe side is slanted 5 mm lower
than the opposite side.
Drain pipe side
Poured water
0 to 5 mm
Vinyl hose
Fig. 3-8
(6) After completing the adjustment of the clearance, fasten all
upper and lower suspension nuts tightly.

3-4. Installing the Drain Piping

(1) Prepare standard hard PVC pipe (O.D. 32 mm) for the
drain and use the supplied drain hose and hose band to
prevent water leaks. The PVC pipe must be purchased
separately. The unit's transparent drain port allows you to
check drainage. (Fig. 3-9)
Align the hose band with end of the
hose, and tighten so that it does
not contact the bead.
Drainage check Hard PVC
section on drain Hard PVC pipe
socket
Drain hose
port (transparent)
O.D. 32 mm
I.D. 32 mm
(supplied)
(not supplied)
(not supplied)
PVC adhesive
Packing (supplied)
Bead
Fig. 3-9
SUPPLEMENT
CAUTION
● Do not use adhesive at the drain connection port on the
indoor unit.
● Insert the drain pipe until it contacts the socket, as shown in
Fig. 3-9, then secure it tightly with the hose band.
● Tighten the hose clamps so their locking nuts face upward.
(Fig. 3-9)
● Do not use the supplied drain hose bent at a 90° angle.
(The maximum permissible bend is 45°.)
(2) After checking the drainage, wrap the supplied packing
and drain pipe insulator around the pipe, then secure it
with the clamps. (Fig. 3-10)
Drain insulator (supplied)
Vinyl clamps
(field supply)
Fig. 3-10
NOTE
Make sure the drain pipe has a downward gradient (1/100 or
more) and that there are no water traps.
CAUTION
● Do not install an air bleeder as this may cause water to spray
from the drain pipe outlet. (Fig. 3-11)
Air bleeder prohibited
Fig. 3-11
● If it is necessary to increase the height of the drain pipe, the
pipe can be raised a maximum of 590 mm from the bottom
of the ceiling. Do not raise it any higher than 590 mm, as this
could result in water leaks. (Fig. 3-12)
300 mm or less
(as short as possible)
590 mm or less
Fig. 3-12
● Do not install the pipe with an upward gradient from the
connection port. This will cause the drain water to flow
backward and leak when the unit is not operating.
(Fig. 3-13)
Upward gradient prohibited
Fig. 3-13
● Do not apply force to the piping on the unit side when
connecting the drain pipe. The pipe should not be allowed to
hang unsupported from its connection to the unit. Fasten the
pipe to a wall, frame, or other support as close to the unit as
possible. (Fig. 3-14)
Support
pieces
Fig. 3-14
● Provide insulation for any pipes that are run indoors.
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3-5. Checking the Drainage

After wiring and drain piping are completed, use the following
procedure to check that the water will drain smoothly. For this,
prepare a bucket and wiping cloth to catch and wipe up spilled
water.
(1) Connect power to the power terminal board (R, S
terminals) inside the electrical component box.
(2) Short the check pin (CHK) on the indoor control board and
operate the drain pump.
CAUTION
Be careful since the fan will start when you short the pin on
the indoor control board.
(3) Pour about 1,200 cc of water into the drain pan using a
siphon pump through the air outlet grille. (Fig. 3-15)
Siphon pump
1,200 cc of water
Fig. 3-15
Check the water flow through the transparent drain pipe
and see if there is any leakage.
(4) When the check of drainage is complete, open the check
pin (CHK) and remount the insulator.
CAUTION
Use 4 × 8 tapping screws to fasten the drainage cover. If
the screws used are longer than 8 mm, it may make a hole
in the drain pan and cause leakage.
Removing the side panel
(1) Push the tab on both sides of the side panel inward (a)
to disengage the tab (first stage) and move the panel
horizontally (b).
Side panel
Tab (second stage)
Tab (first stage)
a
Tab of both sides
b
Fig. 3-16
(2) Push the area in the vicinity of the tab (second stage)
inward while holding both sides of the side panel to remove
the side panel.

■ 2-Way Cassette Type (L1 Type)

3-6. Preparation for Suspending

This unit uses a drain pump. Use a carpenter's level to check
that the unit is level.

3-7. Suspending the Indoor Unit

(1) Follow the diagrams to make the holes in the ceiling.
(2) Depending on the ceiling type:
● Insert suspension bolts as shown in Fig. 3-17
Hole-in-anchor
Concrete
Hole-in-plug Insert
Suspension bolt (M10 or 3/8")
(field supply)
Fig. 3-17
or
● Use existing ceiling supports or construct a suitable
support as shown in Fig. 3-18.
Ceiling tiles
Ceiling support
Fig. 3-18
WARNING
It is important that you use extreme care in supporting
the indoor unit from the ceiling. Ensure that the ceiling is
strong enough to support the weight of the unit. Before
hanging the unit, test the strength of each attached
suspension bolt.
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