Hitachi Utopia RPI-2.5HRG User Manual

4-3
FIELD WORK INSTRUCTION
4.3 Select Guide of Drain Pipe for Indoor Unit
 Selecting Method of Drain Pipe Diameter
<Step 1> Calculation of Drain Flow Volume
Calculate from that the drain flow volume is approximately 3 [l/hr] per 1HP of the indoor unit nominal
capacity.
For Example:
Common drain pipe for four 2HP indoor units and four 2.5HP indoor units.
(1) Total Horse Power of Indoor Unit: 42HP+42.5HP=18HP
(2) Total Drain Flow Volume: 18HP3 [l/hr.HP] =54 [l/hr]
<Step 2> Select Drain Pipe from Table A and B
(1) Horizontal Common Pipe with Slope 1/50: VP30 for above Example
(2) Horizontal Common Pipe with Slope 1/100: VP30 for above Example
(3) Vertical Common Pipe: VP30 for above Example
 Drain Piping
Drain Piping
Connection
1/25 to 1/100 Down-Slope
Common Drain Piping
This drain pipe shall be
separating from other pipes.
Incorrect: Upward Slope
Unit
Rising Part
Incorrect
Correct
Inner Diameter
[mm] Slope=1/100
VP20 20 27
VP25 25 50
VP30 31 88
VP40 40 175
VP50 51 334
VP20
VP25
VP30
VP40
VP50
VP65
VP75
Table A. Permissible Drain Flow Volume of Horizontal Vinyl Pipe
Table B. Permissible Drain Flow Volume of Vertical Vin
y
l Pipe
JIS Symbol
JIS Symbol
NOTE
NOTE
Applicable to
Common Pipe
Not Applicable to
Common Pipe
Permissible Flow Volume [l/hr]
5,710
8,280
2,760
Permissible Flow Volume
730
1,440
77
Slope=1/50
39
70
125
247
473
[l/hr]
220
410
Applicable to
Common Pipe
Inner Diameter
[mm]
20
25
31
40
51
67
Not Applicable to
Common Pipe

Hitachi Utopia RPI-2.5HRG Specifications

General

Brand	Hitachi
Model	Utopia RPI-2.5HRG
Category	Air Conditioner
Language	English