Daikin VRV II Series Design, Installation & Testing Instructions page 44

Installation
3.2.8 Drain Pipe Work (Indoor)
!
Drain Pipe
a) The drain pipe must be fitted at a gradient of at least 1/100.
Gradient and
Support
b) Suspension bolts should be used to support long stretches of drain pipe in order to ensure that a
Spacing of supports for horizontal piping
c) The length of pipe laid horizontally should be kept to a minimum.
Drain Trap
Fit any indoor unit whose drain pipe connection is subjected to negative pressure, with a drain trap.
(FXYMP40~125 only)
a) Rig the drain trap as shown in the drawing bellow.
b) Provide one trap per unit. A single trap for converging units will prove ineffective.
c) Rig the trap to allow for future cleaning.
38
Operational steps
Install indoor unit
The drain pipe should be as short as possible and free from airlocks.
gradient of 1/100 is maintained. (PVC pipes should not be bent)
Class Nominal diameter
Rigid PVC pipe 25~40mm
Check for water
Connect drain pipe
leaks
Spacing
1~1.5m
Si39-303
Insulate drain pipe
(V0999)
General Information