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5 Drain piping
Thickness of Copper Pipes
Nominal Diameters
Outer Diameters
1/4
3/8
1/2
5/8
flare Pipe Dimensions
Nominal
Diameters
1/4
3/8
1/2
5/8
5 DRAIN PIPING
5.1 GENERAL
INCORRECT
Incorrect: Upward Slope
Incorrect: rising Part
CORRECT
1/25~1/100 Down Slope
Common Drain Piping
C A U T I O N
• Do not create an upper-slope or rise for the drain piping, since
drain water will flow back to the unit and leakage to the room will
occur when the unit operation is stopped.
• Do not connect the drain pipe with sanitary or sewage piping or
any other drainage piping.
All manuals and user guides at all-guides.com
Thickness
6.35
0.80
9.53
0.80
12.70
0.80
15.88
1.00
Outer
A
Diameters
+0/-0.4
6.35
9.1
9.53
13.2
12.70
16.6
15.88
19.7
Drain Piping connection
7
PmmL0231A rev. 0 - 02/2011
flare Nut Dimensions
(mm)
(mm)
• When the common drain piping is connected with other indoor
units, the connected position of each indoor unit must be higher
than the common piping. The pipe size of the common drain pipe
must be large enough according to the unit size and number of unit.
• Drain piping will require insulating if the drain is installed in a loca-
tion where condensation forming on the outside of drain pipe may
drop and cause damage. The insulation for the drain pipe must be
selected to insure vapor sealing and prevent condensation form-
ing.
• Drain trap should be installed next to indoor unit. This trap must be
designed to good practice and be checked with water (charged)
and tested for correct flow. Do not tie or clamp the drain pipe and
refrigerant pipe together.
N O T E
Install drainage in accordance with national and local codes.
After performing drain piping work and electrical wiring, check to ensure
that water flows smoothly as in the following procedure:
Checking with Drain-Up Mechanism and float Switch
-
Switch ON the power supply.
-
Pour approximately 1.8 liters of water into the drain pan, then float
switch up and drain pump start working automatically.
-
Check to ensure that the water flows smoothly or whether no water
leakage occurs. When water cannot be found at the end of the
drain piping, pour another approximately 1.8 liters of water into the
drain pan.
-
Switch OFF the power supply after.
N O T E
Pay attention to the thickness of the insulation when the left side
piping is performed. If it is too thick, piping can not be installed in
the unit.
Nominal
Outer
Diameters
Diameters
1/4
6.35
3/8
9.53
1/2
12.70
5/8
15.88
(mm)
B
17
22
26
29
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