Daikin VRV III Manual page 403

Installation
Drain Piping Work
1.
Rig drain piping (Refer to Fig. 26)
As for drain work, perform piping in such a manner that water can be drained properly.
As for drain piping, the connection can be made from three different directions.
•
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 20 mm, outside diameter 26 mm).
•
Keep the drain pipe short and sloping downwards at a gradient of at least 1/100 to prevent air pockets
from forming. (Refer to Fig. 27)
CAUTION
Water pooling in the drainage piping can cause the drain to clog.
Drain hose (1) (For VP20 connection)
Drain piping
(accessory)
(field supplied)
VP20
Elbow (10)
Clamp (2) (accessory)
Notes on upward running drain hose
Fig. 26
• To keep the drain hose from sagging, space hanging wires every 1 to 1.5 m. (Refer to Fig. 26)
• Use only the included drain hose (1), (for rightward running drain hose) or elbow (10) (for upward run-
ning drain hose) and clamp (2).
• Fit the drain hose (1) or elbow (10) over the drain pipe up to the neck and fasten tight with the clamp (2).
• Insulate the clamp (2) and drain hose or elbow (10) with the included sealing pad (8). (Refer to Fig.28)
• Make sure that heat insulation work is executed on the following 2 spots to prevent any possible water
leakage due to dew condensation.
• Insulate the drain hose inside the building.
• Drain socket
Metal clamp (2) (accessory)
Elbow (10)
(accessory)
Large sealing pad (8) (accessory)
CAUTION
•
Do not twist or bend the drain hose (1), so that excessive force is not applied to it, as this could cause leaks.
•
If converging multiple drain piping, install according to the procedure shown below. (Refer to Fig. 29)
Select converging drain piping whose gauge is suitable for the operating capacity of the unit.
398
Ceiling slab
1 - 1.5 m
Hanger
bracket
VP20
Large sealing pad (8) (accessory)
Metal clamp (2) (accessory)
Long
end
Large sealing pad (8)
(accessory)
Metal clamp (2)
(accessory)
Drain hose (1)
Tape
(accessory)
Rearward running piping
Rightward running drain hose
Fig. 27
Drain hose (1)
(accessory) Upward
running
piping
Metal clamp (2) Large
sealing pad (8)
(accessory)
(accessory)
≤ 4mm
Fig. 28
T-joint converging drain piping
Fig. 29
: http://splitoff.ru/tehn-doc.html
ED34-862
Min. 1/100 gradient
GOOD
WRONG
Large sealing pad (8) (accessory)
Elbow (10) (accessory)
Metal clamp (2)
(accessory)
Short end
FXUQ-MA