Installation
SiE33-003
38
General Information
Piping Diameter for
Grouped Drain
Pipes
Select piping diameter from the below table in accordance with the amount of condensation drained by
all units with a common drain pipe.
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)
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)
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.
JIS nominal
Vinyl chloride pipe
diameter (mm)
Allowable flow rate (l/hr)
Remarks
Piping gradient 1:50
Piping gradient 1:100
VP20
20
39
27
(Reference value) Cannot
be used in grouped piping.
VP25
25
70
50
VP30
31
125
88
Can be used in grouped
piping.
VP40
40
247
175
VP50
51
473
334
JIS nominal
Vinyl chloride pipe
diameter (mm)
Allowable flow rate
(l/hr)
Remarks
VP20
20
220
(Reference value) Cannot
be used in grouped piping.
VP25
25
410
VP30
31
730
Can be used in grouped
piping.
VP40
40
1440
VP50
51
2760
VP65
67
5710
VP75
77
8280
Si33-003.book Page 38 Monday, June 25, 2001 9:06 AM
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