Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 709

18.2.7 Characteristics of fan
• External static pressure table
Duct specs. 1 spot closing (1)
Air flow
Stan- High
(m 3 /min)
dard speed (4)
Type
FDR208-A 14 — —
FDR258-A 18 30(3) 65(6.5)
FDR308-A 20 25(2.5) 60(6)
FDR408-A 28 40(4) 70(7)
FDR508-A 34 40(4) 70(7)
Notes (1) 1 spot closing: Round duct flange at center is removed and shield
with a decorative panel (option).
(2) Standard: ø200 ducts are installed at all blowout holes.
(3) Square duct: All round ducts are removed and replaced with special
square duct flanges (option).
(4) When operating at a high speed, invert the connection of white
and red connectors on the flank of control box.
Model FDR208-A
120(12)
100(10)
80(8)
60(6)
40(4)
20(2)
0(0)
[Standard] 2-spot blower internal resistance
Square duct blower internal resistance
–20(–2)
Internal resistance without suction panel
Internal resistance without filter
10 12
Lower
Air flow (m
limit
Unit: Pa (mmAq)
Standard (2) Square duct (3)
Stan- High Stan- High
dard speed (4) dard speed (4)
50(5) 85(8.5) 50(5) 90(9)
45(4.5) 80(8) 50(5) 85(8.5)
45(4.5) 80(8) 50(5) 85(8.5)
50(5) 80(8) 50(5) 85(8.5)
50(5) 80(8) 55(5.5) 85(8.5)
14 15.5
Upper
/min)
3
limit
How to interpret the blower characteristics table
Example : Case of FDR308-A
40(4)
20(2)
0(0)
[Standard]3-spot blower
internal resistance
Square duct blower internal resistance
–2(–2)
Internal resistance without suction panel
Internal resistance without filter
14 17
Air flow (m 3 /min)
Model FDR258-A
120(12)
100(10)
80(8)
60(6)
40(4)
20(2)
2-spot blower internal resistance
0(0)
[Standard] 3-spot blower internal resistance
Square duct blower internal resistance
–20(–2)
Internal resistance without suction panel
13 14
Lower
limit
V MULTI
1 2-spot blowout.....................
Internal resistance increases more
than the standard 3-spot blowout.
Approx. 14 (1.4) Pa (mmAq) at
3
17m /min.
2 Square duct blowout...........
Internal resistance decreases
more than the standard round
duct (ø200 3-spot). 3 (0.3) Pa
(mmAq) at 17 m 3 /nin. (External
static pressure increases in
reverse.).
3 Decorative panel...................
When the decorative panel is not
used with the ceiling return type,
20 22
the part of internal resistance
related to the panel decrease. 3
(0.3) Pa (mmAq) at 17mm
Internal resistance without filter
16 18 20
Upper
Air flow (m /min)
3
limit
3 /min.
707