Installing The Drain Piping; Checking The Drainage - Panasonic S-12MU1U6 Installation Instructions Manual

3-32. Installing the Drain Piping

(1) Prepare standard hard PVC pipe (O.D. 1-1/32") for the
drain and use the supplied hose band to prevent water
leaks.
The PVC pipe must be purchased separately. The
transparent drain part on the unit allows you to check
drainage.
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 the fi gure at right, then secure it tightly
with the hose band.
●
Do not use the supplied drain hose bent at a 90°
angle. (The maximum permissible bend is 45°.)
●
Tighten the hose clamps so their locking nuts face
in the horizontal direction.
●
Make sure that the drain port is not a downward
gradient from the joint section (may lead to
abnormal noise).
NOTE
Make sure the drain pipe has a downward gradient (1/100
or more) and that there are no water traps.
CAUTION
●
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 19-11/16". Do not raise
it any higher than 19-11/16", as this could result in
water leaks.
●
Do not install the pipe with an upward gradient from
the connection port. This will cause the drain water to
fl ow backward and leak when the unit is not operating.
●
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.

3-33. 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 eyelet cap and through the opening,
slowly pour about 0.13 gal of water into the drain pan
to check drainage.
(3) Short the check pin (CHK) on the indoor control board
and operate the drain pump. Check the water fl ow
through the transparent drain port and see if there is
any leakage.
VRF_Indoor_US.indb 39 VRF_Indoor_US.indb 39
●
Do not install an air bleeder as
this may cause water to spray
from the drain pipe outlet.
Twist tie
(4 ties, supplied)
Drain hose
insulation
Drain port
(supplied)
13/64
13/64
1 1
5-33/64
Unit
Fig. 3-112
●
Attach so that the hose band
fastener is on the side of the
CAUTION
drain port.
●
Attach the hose bands so
that each is approximately
1/4" to 1" from the end of the
supplied drain hose.
Air bleeder
Prohibited
Fig. 3-113
at least 1/100
Good
Fig. 3-114
Upward gradient
Prohibited
Fig. 3-115
Support pieces
Fig. 3-116
39
Unit: in.
Hard PVC pipe
Position to
(equivalent to
fasten hose
O.D. 1-1/32")
bands
(Field supply)
Drain hose
(supplied)
Hose band
(2 bands, supplied)
11-13/16" or less
(not a downward gradient)
19-11/16" or less
2011/09/30 12:23:08 2011/09/30 12:23:08