Installing The Drain Piping; Checking The Drainage; Wall Mounted Type (K1 Type) 22, 28, 36 Types; Remove The Rear Panel From The Unit - Panasonic S-28MD1E5 Instructions D'installation

SUPPLEMENT
(3) Cut the ceiling material, if necessary.
(Refer to Figs. 3-19 and 3-20, and Table 3-1.)
Center of the
panel and ceiling
opening
D E
40
C
Suspension bolt pitch B
70 30
Ceiling opening dimension A
Fig. 3-19
Table 3-1 Unit: mm
A B C D E
22, 28, 36, 45, 56 1,020 920 840 440 480
73 1,320 1,220 1,140 550 590
Unit: mm
Refrigerant connection
Drain outlet outlet (liquid tube)
Refrigerant Outlet for power cord,
connection outlet inter-unit wiring &
(gas tube) optional cord
Adjust so that the distance between the indoor unit and the
bottom surface of the ceiling is 60 to 65 mm.
Fig. 3-20
(4) If the system requires fresh air to be drawn into the unit,
cut and remove the insulation (both externally and
internally) at the location shown as A in Fig. 3-21.
A
Fig. 3-21
CAUTION
When making the cuts to the insulation, be careful not to
damage the drain pan.
3-8. Placing the Unit Inside the Ceiling
(1) When placing the unit inside the ceiling, determine the
pitch of the suspension bolts.
Tubing must be laid and connected inside the ceiling when
suspending the unit. If the ceiling is already constructed,
lay the tubing into position for connection to the unit before
placing the unit inside the ceiling.
(2) Thread the 3 hexagonal nuts and 2 washers (field supply)
onto each of the the 4 suspension bolts as shown in Fig.
3-23. Use 1 nut and 1 washer for the upper side, and 2
nuts and 1 washer for the lower side, so that the unit will
not fall off the suspension lugs.
(3) The distance between the unit and the opening in the
ceiling and the distance between the bottom surface of
the ceiling and the bottom surface of the flange of the unit
should follow the dimensions given in Fig. 3-22. Use the
supplied installation gauge to check.
Unit: mm
Fig. 3-22
Suspension bolt
Suspension lug
Nuts and washers
Upper
Lower
Double nuts
Fig. 3-23

3-9. Installing the Drain Piping

(1) Prepare a 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.
When doing this, leave a gap between the drain socket
and the PVC pipe to allow the drainage to be checked.
The unit's transparent drain port allows you to check the
drainage. (Fig. 3-24)
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 port Hard PVC pipe
socket
Drain hose
(transparent)
O.D. 32 mm
I.D. 32 mm
(supplied)
(not supplied) (not supplied)
PVC adhesive
Bead Packing (supplied)
Fig. 3-24
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. 3-24, then secure it tightly with the hose band.
● Tighten the hose clamps so their locking nuts face upward.
(Fig. 3-24)
● Do not use the supplied drain hose bent at a 90° angle.
(The maximum permissible bend is 45°.)
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(2) After checking the drainage, wrap the supplied packing
and drain pipe insulator around the pipe, then secure it
with the supplied clamps. (Fig. 3-25)
Drain insulator (supplied)
Vinyl clamps
Fig. 3-25
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. 3-26)
Air bleeder
Fig. 3-26
● If it is necessary to increase the height of the drain pipe,
the section directly after the connection port can be
raised a maximum of 500 mm. Do not raise it any higher
than 500 mm, as this could result in water leaks.
(Fig. 3-27)
300 mm or less (as short as possible)
500 mm or less
Fig. 3-27
● 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. 3-28)
Upward gradient prohibited
Fig. 3-28
● 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. 3-29)
Support
pieces
Fig. 3-29
● Provide insulation for any pipes that are run indoors.

3-10. 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) Remove the tube cover and through the opening, slowly
pour about 1,200 cc of water into the drain pan to check
the drainage.
(3) Short the check pin (CHK) on the indoor control board and
operate the drain pump. Check the water flow through the
transparent drain port and see if there is any leakage.
CAUTION
Be careful since the fan will start when you short the pin on
the indoor control board.
(4) When the check of drainage is complete, open the check
pin (CHK) and remount the tube cover. (Fig. 3-30)
Drainage check section
(transparent drain port) Inspection cover
Water for checking drainage
(Approx. 1,200 cc)
Fig. 3-30
CAUTION
To mount the tube cover, use 4 × 8 tapping screws.
(Fig. 3-30) Do not use long screws as they may puncture
the drain pan and cause water leakage.
■ Wall Mounted Type (K1 Type)
22, 28, 36 types

3-11. Remove the Rear Panel from the Unit

(1) Remove and discard the set screw on the rear panel.
(Fig. 3-31)
Set screw only for transportation
Fig. 3-31
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