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Si33-102.book Page 37 Tuesday, June 26, 2001 3:18 PM
SiE33-102
Piping Diameter for Select piping diameter from the below table in accordance with the amount of condensation drained by
Grouped Drain
all units with a common drain pipe.
Pipes Consider 2 l/hr of drainage for every 1 HP. For example, drainage from 3 units running at 2 HP and 2
units running at 3 HP is calculated as follows.
2 (l/hr) × 2 (HP) × 3 (units) + 2 (l/hr) × 3 (HP) × 2 (units) = 24 l/hr
1. Relationship between horizontal pipe diameter and allowable drainage (for extended ventilation
system)
JIS nominal
VP20
VP25
VP30
VP40
VP50
Notes: Calculations have been made with water area inside the pipe as 10%.
Allowable flow rate figures below the decimal have been discarded.
Use VP30 or larger pipe after the convergence point.
2. Relationship between riser diameter and allowable drainage (for extended ventilation system)
JIS nominal
VP20
VP25
VP30
VP40
VP50
VP65
VP75
Notes: Allowed flow rate figures below the decimal have been discarded.
Use VP30 or larger pipe in risers.
Use the same drain pipe for the humidifier as the indoor unit.
3.2.9 Drain Piping for Each Model
FXYC-2-way blow 1. Rig drain piping
ceiling mounted
The diameter of the drain pipe should be greater than or equal to the diameter of the connecting pipe
cassette (vinyl tube; pipe size: 25mm; outer dimension: 32mm).
Keep the drain pipe short and sloping downwards at a gradient of at least 1/100 to prevent air pockets
from forming.
If the drain hose cannot be sufficiently set on a slope, execute the drain raising piping.
To keep the drain hose from sagging, space hanging wires every 1 to 1.5 m.
Use the attached drain hose and clamp metal.
Insert the drain hose into the drain socket, up to the white tape. Tighten the clamp until the screw head
is less than 4 mm from the hose.
Wrap the attached sealing pad over the clamp and drain hose to insulate.
General Information
Allowable flow rate (l/hr)
Vinyl chloride pipe
diameter (mm)
Piping gradient 1:50 Piping gradient 1:100
20 39
25 70
31 125
40 247
51 473
Vinyl chloride pipe Allowable flow rate
diameter (mm) (l/hr)
20 220
(Reference value) Cannot
be used in grouped piping.
25 410
31 730
40 1440
Can be used in grouped
51 2760
piping.
67 5710
77 8280

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Installation
Remarks
27
(Reference value) Cannot
be used in grouped piping.
50
88
Can be used in grouped
175
piping.
334
Remarks
37