Engineering Manual

120
10-5-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
…
Designed amount of fresh air intake
<CMM(CFM)>
A
…
Static pressure loss of fresh air intake
duct system with airflow amount Q
<Pa(in.W.G.x10
-2
)>
B
…
Forced static pressure at air con-
ditioner inlet with airflow amount Q
<Pa(in.W.G.x10
-2
)>
C
…
Static pressure of booster fan with
airflow amount Q <Pa(in.W.G.x10
-2
)>
D
…
Static pressure loss increase amount
of fresh air intake duct system for
airflow amount Q <Pa(in.W.G.x10
-2
)>
E
…
Static pressure of indoor unit with
airflow amount Q <Pa(in.W.G.x10
-2
)>
Qa
…
Estimated amount of fresh air intake
without D <CMM(CFM)>
How to read curves
Fresh air intake hole
At the time of installation, use the duct holes (knock out)
located at the positions shown in the left diagram, as and
when required.
A
Indoor unit
B
Fresh air intake hole (knock out hole)
C
Filter
in. (mm)
A B C
10-3/16
(259.5)
ø 3-15/16
(ø 100)
4-5/16
(109)
77
A
B
A
B
C
C
PCA-A36, 42KA7
■
50(20)
0
-50(-20)
-100(-40)
-150(-60)
-200(-80)
-250(-100)
-300(-120)
Static pressure[Pa(in.W.G.×10ˉ²]
Airflow rate
0 1 2 3 4
[CMM]
[CFM]
50 100
PCA-A24, 30KA7
■
50(20)
0
-50(-20)
-100(-40)
-150(-60)
-200(-80)
-250(-100)
-300(-120)
Static pressure[Pa(in.W.G.×10ˉ²]
Airflow rate
0 1 2 3 4
[CMM]
[CFM]
50 100
Q
0
B
A
C
1
Curve in the
graphs
Duct characteristics
at site
Q
A
E C
2
Q
Qa
A D
3