Drainage And Drain Pipe Installation - Hitachi RASC-4HNPE Service Manual

3 Piping work and refrigerant charge

Drainage and drain pipe installation

3.7 Drainage and drain pipe installation
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Provision regarding installation place
Drain water sometimes turns to ice. Therefore, avoid draining in a transited area, since it may become slippery.
Install the unit making sure that the drain outlet part is lower (>25mm / <30mm) than the opposite side in order to avoid
incorrect drain discharge.
Floor mounted
Drain pipe
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Drain pipe location
Drain pipe location is indicated in the figures below:
RASC-(4-6)HNPE
Drain pipe
(30 mm Outer diameter)
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Drain pipe connection
• It is mandatory to connect a siphon as shown in the figure below. Pay special attention when connecting it to the
unit (proper installation work is needed in order to guarantee matching of connection pipes).
Slope >2%
• Fasten the siphon to the drain hose with an adhesive and a field-supplied clamp.
• Prepare a draining pipe with an internal diameter higher than 30 mm for the draining line which shall be bent with a
down slope > 2 %.
• Check to ensure that the water drains smoothly by pouring some water into the drain pan.
• Check to ensure that the water does not remain in the drain pan.
• Check the drain connections periodically (once a year), to avoid occurrence of water leakage.
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C A U T I O N
• If the unit is installed in a cold area, the drain water may freeze. Install an electric heater (field-supplied) at the drain connection.
• Do not install the unit using vibration-proof springs or mounting springs.
57 SMGB0091 rev.2 - 11/2015
>25mm
<30mm
>75 mm
Plug
Ceiling suspended
>25mm
<30mm
Drain pipe
RASC-(8/10)HNPE
Drain pipe (x2 locations)
(30 mm Outer diameter)
C
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