Hitachi HNE Serie Manual De Instalación Y Funcionamiento página 26

UNITS INSTALLATION
10.2. FAN PERFORMANCE CURVE
Outdoor unit could be installed using ducts at inlet and outlet air.
Refer to fan performance curve, in order to ensure that the air volume is within working range.
It's assumed that unit will be installed using supply and return air ducts. Find below fan performance curve to decide which ducts
are suitable
RASC-5HNE
Air flow (m³/min)
Nominal Point

NOTE:
When design a duct, check to ensure that the Air volume is within working range as indicate "Fan Performance Curve".
-
- If the Air volume is set outside working range, water-carry-over (drop in the ceiling or into the room), noise increases, fan motor
damaged (high temperature), insufficient Cooling/Heating capacity, phenomena can occur.
Therefore design ducts and select the correct fan speed in order to keep the unit running in the accepted working range
-
selected.
Specific installation comment for RASC-5HNE:
•
It's recommended to set up ducting work in order to keep static pressure around 10mmAq. If measuring static pressure or
-
airflow is not available, measuring ampers can give and idea of working point. As a reference, at Pst = 0mmAq is 5.4 A, and at
Pst = 10mmAq is 4.65 A approximately (only approximated since motor temperature, voltage will affect Amps measurement).
If installation requires short and straight ducts (Pst ≤3mm Aq) installation, whistle air sound could appear. in order to avoid this
-
situation it's advisable to close suction air inlet on outdoor unit (half of suction air inlet closed, for example).
All manuals and user guides at all-guides.com
RASC-10HNE
Air flow (m³/min)
Nominal Point
PMGB0126A rev.2 - 11/2006
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