Indoor Service Manual

31
30
OCH669A
10 4-WAY AIRFLOW SYSTEM
10-1. FRESH AIR INTAKE (LOCATION FOR INSTALLATION)
At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required.
120°
120°
[
3-15/16
5-17/32
7-11/32
1-15/32
+7/32
0
8-7/32
Detail drawing of fresh air intake
Ceiling surface
Refrigerant pipe
Drain pipe
Electrical Box
Fresh air intake
Cutout hole
(Unit: inch)
Burring hole
Static pressure : P [Pa(in.W.G.o10
-
²)]
Airflow : Q
−30 (-12)
0
−150 (-60)
−120 (-48)
−90 (-36)
−60 (-24)
0 0.3 0.6
0.9
1.2 1.5
10 0 20 30 40 50
[CFM]
[CMM]
Taking air into the unit
10-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
0
B
A
C
1
Curve in the
left graphs
Duct characteristics
at site
Q
A
E C
2
Q
Qa
A D
3
How to read curves
● Whenever the indoor unit operates, the
duct fan operates.
(1) Connect the optional multiple remote
controller adapter (PAC-SA88HA-E)
to the connector CN51 on the indoor
controller board.
(2) Drive the relay after connecting the
12 V DC relay between the Yellow
and Orange connector wires.
Use a relay of 1W or smaller.
MB: Electromagnetic switch power
relay for duct fan.
X: Auxiliary relay (12 V DC LY-1F)
Be sure to secure insulation
material by tape, etc.
5
Green
Yellow −
Orange
+
Connector (5P)
Indoor unit side
Multiple remote
controller adapter
PAC-SA88HA-E
Be sure to secure insulation
material by tape, etc.
Installation at site
CN51
on
indoor unit
board
Red
Brown
1
~
MB
Multiple remote
controller adapter
PAC-SA88HA-E
Indoor controller board
Distance between indoor
controller board and relay
must be within 10m.
CN51
10-3. OPERATION IN CONJUNCTION WITH DUCT FAN (BOOSTER FAN)
NOTE: Fresh air intake amount should be 10% or less of
whole air amount to prevent dew dripping.
Q
…
Designed amount of fresh air intake
<CMM (CFM)>
A
…
Static pressure loss of fresh air intake
duct system with air flow amount Q
<Pa (in.W.G.o10
-2
)>
B
…
Forced static pressure at air conditioner
inlet with airflow amount Q
<Pa (in.W.G.o10
-2
)>
C
…
Static pressure of booster fan with air
flow amount Q <Pa (in.W.G.o10
-2
)>
D
…
Static pressure loss increase amount of
fresh air intake duct system for air flow
amount Q <Pa (in.W.G.o10
-2
)>
E
…
Static pressure of indoor unit with air
flow amount Q <Pa (in.W.G.o10
-2
)>
Qa
…
Estimated amount of fresh air intake
without D <CMM (CFM)>