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6. Refrigerant piping work
6.4. Drain piping work
• Ensure that the drain piping is downward (pitch of more than 1/100) to the outdoor
(discharge) side. Do not provide any trap or irregularity on the way.
• Ensure that any cross-wise drain piping is less than 20 m (excluding the difference
of elevation). If the drain piping is long, provide metal braces to prevent it from
waving. Never provide any air vent pipe. Otherwise drain may be ejected.
• Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm) for drain
piping.
• Ensure that collected pipes are 10 cm lower than the unit body's drain port.
• Do not provide any odor trap at the drain discharge port.
• Put the end of the drain piping in a position where no odor is generated.
• Do not put the end of the drain piping in any drain where ionic gases are generated.
[Fig. 6-4-1]
C
A
B
C
D
A Downward slope 1/100 or more
B Drain hose (Accessory)
C Indoor unit
D Collective piping
E Maximize this length to approx. 10 cm
7. Duct work
• Connect canvas duct between unit and duct.
[Fig. 7-1]
D
C
B
I
A
A Air inlet
B Air filter (supplied at site)
C Duct
D Canvas duct
E Access door
F Ceiling
G Ensure sufficient length to prevent short cycling
H Air outlet
I Keep duct-work length 850 mm or more
• Use incombustible material for duct parts.
• Provide full insulation to inlet duct flange and outlet duct to prevent condensation.
• Be sure to change the position of air filter to a position where it can be serviced.
Caution:
• Inlet duct of 850 mm or more should be constructed.
To connect the air conditioner main body and the duct for potential
equalization.
• To reduce the risk of injury from metal sheet edges, wear protective gloves.
• To connect the air conditioner main body and the duct for potential
equalization.
• The noise from the intake will increase dramatically if intake is fitted directly
beneath the main body. Intake should therefore be installed as far away from
the main body as possible.
• Install sufficient thermal insulation to prevent condensation forming on
outlet duct flanges and outlet ducts.
• Keep the distance between the inlet grille and the fan over 850 mm.
If it is less than 850 mm, install a safety guard not to touch the fan.
• To avoid electrical noise interference, do not run transmission lines at the
bottom of the unit.
C
C
E
D
F
E
G
1. Insert the drain hose (accessory) into the drain port.
(The drain hose must not be bent more than 45° to prevent the hose from break-
ing or clogging.)
The connecting part between the indoor unit and the drain hose may be discon-
nected at the maintenance. Fix the part with the accessory band, not be adhered.
2. Attach the drain pipe (O.D. ø32 PVC TUBE, field supply).
(Attach the pipe with glue for the hard vinyl chloride pipe, and fix it with the band
(small, accessory).)
3. Perform insulation work on the drain pipe (O.D. ø32 PVC TUBE) and on the
socket (including elbow).
[Fig. 6-4-2]
I
B
A
5
D
A Indoor unit
B Insulation pipe 25 mm (small) (accessory)
C Tie band (short)
D Band fixing part
E Insertion margin
F Drain hose (accessory)
G Drain pipe (O.D. ø32 PVC TUBE, field supply)
H Insulating material (field supply)
I Max.150 ± 5 mm
C
H
G
F
25
H
E
C
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