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Fig. 3-91
Fig. 3-92
Drain hose
(supplied)
(not supplied)
(not supplied)
Packing (supplied)
VP-25
Align the hose band with end of the
hose, and tighten so that it does not
contact the bead.
Drainage check
section on drain port
(transparent)
Hard PVC
socket VP-25
Hard PVC
pipe
PVC adhesive
Bead
Vinyl clamps
Drain insulator (supplied)
3-22. Installing the Drain Piping
(1) Prepare standard hard PVC pipe (O.D. 1-1/4") 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. (Fig. 3-91)
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 figure 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 upward.
(Fig. 3-91)
(2) After connecting the drain piping securely, wrap the supplied
packing and drain pipe insulator around the pipe, then secure it
with the supplied vinyl clamps. (Fig. 3-92)
NOTE
Make sure the drain pipe has a downward gradient (1/100 or more)
and that there are no water traps.
●
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. (Fig. 3-94)
●
Do not install the pipe with an upward gradient from the connec-
tion port. This will cause the drain water to flow backward and leak
when the unit is not operating. (Fig. 3-95)
●
Do not apply force to the piping on the unit side when connecting
the drain pipe. The pipe should not be allowed to hang unsupport-
ed from its connection to the unit. Fasten the pipe to a wall, frame,
or other support as close to the unit as possible. (Fig. 3-96)
3-23. Checking the Drainage
After wiring and drain piping are completed, use the following proce-
dure 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
approx. 0.3 gal of water into the drain pan to check drainage.
(3) Short the check pin (CHK) on the indoor control board and oper-
ate the drain pump. Check the water flow through the transparent
drain port and see if there is any leakage.
CAUTION
●
Do not install an air bleeder as this may
cause water to spray from the drain pipe
outlet. (Fig. 3-93)
Fig. 3-93
Fig. 3-94
Air bleeder
Prohibited
Good
11-13/16" or less
19-11/16" or less
Fig. 3-95
Fig. 3-96
Prohibited
Upward gradient
Support pieces