English
13
•
Shortage of refrigerant due to air purge or losing the additional refrigerant charging may cause the failure
of the unit (does not sufficiently cool or heat).
Be sure to refer the installation manual or the engineering guide for the outdoor unit at the refrigerant
piping work.
CAUTION
•
Do not use anything such as the oxidation inhibitor when brazing. (Residues may result in the clogging
pipe or parts damage.)
7. DRAIN PIPING WORK
(1)
Rig drain piping
•
As for drain work, perform piping in such a manner that water can be drained properly.
• Employ a pipe with either the same diameter or with the diameter larger (excluding the raising section)
than that of the connecting pipe (PVC pipe, nominal diameter 25mm, outside diameter 32mm).
•
Keep the drain pipe short and sloping downwards at a gradient of at least 1/100 to prevent air pockets
from forming.
CAUTION
Water accumulating in the drain piping can cause the drain to clog.
• If the drain pipe cannot be sufficiently set on a slope, execute the drain raising piping.
•
To keep the drain pipe from sagging, space hanging wires every 1 to 1.5m.
WRONG
Fig. 18-2
Supporting hanger
1/100 gradient or more
GOOD
1–1.5m
• Use the attached drain hose (1) and metal clamp (2).
• Connect the drain hose (1) to the stage part of the drain socket and securely tighten the metal clamp (2)
with the tape on the insertion end of the hose. Tighten the screw of the metal clamp (2) until the remain
-
der will become 4mm or less.
Drain socket
Metal clamp (2)
(accessory)
Stage part
Drain hose (1)
(accessory)
VP25 side
VP20 side
Tape part
Fig. 18-1
Fig. 19
