Hitachi RCI Service Manual page 111

3 Piping work and
refrigerant charge
Dimensions of the flare nuts for flared connections
Nominal diameter
mm inches
Ø6.35 1/4
Ø9.53 3/8
Ø12.70 1/2
Ø15.88 5/8
¿ Drain pipe installation
The correct position for the drain hose connection is shown below.
Prepare a polyvinyl chloride (PVC) pipe with an outer diameter of
32 mm.
The drain hose must have a gradient of 1% (1/100) to 4% (1/25).
The drain hose cannot be installed on an upwards line, not even
on one section of the installation. In this case, the condensate water
accumulates at the lowest point immediately before the raised
section of the installation.
Then insulate the drain hose appropriately (only for RPI-(2.0–
6.0)FSN2E).
Connect a trap to the drain hose at the angle indicated, as indicated
in the figure (for RPI-(8.0/10.0)FSN2E).
N O T E
If the relative humidity of the inlet air or the ambient air
exceeds 80% in the place where the unit is installed, fit an
auxiliary drain pan (field-supplied) below the indoor unit, as
indicated in the figure.
99
SMGB0063 rev. 1 - 10/2010
Measurement B mm
17
22
26
29
Insulating material (field-supplied)
Insulating material:
(factory-supplied)
Clamp
(factory-supplied)
> 75 mm
4% (1/25) - 1% (1/100)
Indoor unit
Auxiliary drain pan
(field-supplied)
3
4% (1/25) - 1% (1/100)
PVC pipe
(field-supplied)
Cap