Hitachi CENTRIFUGAL VRF RASC-HNPE Serie Manual De Instrucciones página 19

UNITS INSTaLLaTIoN
RASC-6HNPE
130
120
110
100
90
80
70
60
50
40
30
20
10
0
40 45 50
Air flow (m³/min)
RASC-10HNPE
130
120
110
100
90
80
70
60
50
40
30
20
10
0
100 105 110
Air flow (m³/min)
7.4.1 Setting of the fan performance curves
In some installations, it may be necessary to adjust the fan
operation settings of RASC-(6/8/10)NPE units in order to
achieve an optimal performance of the fan unit. The correct
static pressure setting (Low / Medium / High) has to be selected
using the PSW and 7-segment display on the RASC PCB,
according to the pressure values below:
• RASC-(4/5)HP: No setting is required.
• RASC-(6/8)HP: Select the "Medium pressure setting (f2:1)"
for external static pressures higher than 50Pa.
9 PMML0399B rev.0 - 11/2015
55 60 65 70 75
115 120 125 130 135
130
120
110
100
90
80
70
60
50
40
30
20
10
0
100 105 110
80
?
N O T E
• When designing a duct, check to ensure that the Air volume is
within working range as indicated in the fan performance curves.
• If the Air volume is set outside working range, water carry-over
(drop in the ceiling or into the room), noise increase, damage to fan
140
motor (high temperature) or insufficient Cooling/Heating capacity
phenomena can occur.
• RASC-10HP: Select the most suitable static pressure
setting, depending on the installation conditions:
- "Medium pressure setting (f2:1)": For external static
pressures between 50 and 80 Pa.
- "High pressure setting (f2:2)": For external static
pressures higher than 80 Pa.
Default value: "Low pressure setting (f2:0)"
In order to do so, measure the fan motor current and set the
static pressure setting according to the following table. For
the measurement of the fan motor current, please refer to the
following drawing
RASC-8HNPE
115 120 125 130 135
Air flow (m³/min)
140