Mitsubishi Electric City Multi PMFY Series Technical & Service Manual page 14

4-3. AIR CAPACITY TAKEN FROM OUTSIDE
PMFY-P·VBM-E series enables to take fresh air from outside. When taking fresh air, the duct fan is used.
The air capacity should be 20% or less of the air flow SPEC(Hi).
Service Ref.
PMFY-P20VBM-E
PMFY-P20VBM-E
1
PMFY-P20VBM-E#2
PMFY-P25VBM-E
PMFY-P25VBM-E
1
PMFY-P25VBM-E#2
PMFY-P32VBM-E
PMFY-P32VBM-E
1
PMFY-P32VBM-E#2
PMFY-P40VBM-E
PMFY-P40VBM-E
1
PMFY-P40VBM-E#2
Operation in conjunction with duct fan (Booster fan)
●
Whenever the indoor unit is operating, the duct fun
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 12V DC relay
between the Yellow and Orange connector lines.
( *
) Use a relay of 1W or smaller.
MB: Electromagnetic switch power relay for duct fan.
X: Auxiliary relay (12V DC LY-1F)
How to read curves
Duct characteristics
Curve in the
at site
1
right graphs
0
Q
2
Q
3
Q
Qa
OC307F
250 288.5
Fresh air intake hole
(Knockout)
Air flow (Hi) Air capacity from outside
PMFY-P20VBM-ER3
PMFY-P20VBM-ER4
8.7m³/min
PMFY-P25VBM-ER3
PMFY-P25VBM-ER4
9.3m³/min
PMFY-P32VBM-ER3
PMFY-P32VBM-ER4
9.3m³/min
PMFY-P40VBM-ER3
PMFY-P40VBM-ER4
10.7m³/min
Q...Designed amount of fresh air intake
<m
A...Static pressure loss of fresh air
intake duct system with air flow
amount Q
B...Forced static pressure at air condi-
tioner inlet with air flow amount Q
C...Static pressure of booster fan with
air flow amount Q
D...Static pressure loss increase amount
of fresh air intake duct system for air
flow amount Q
E...Static pressure of indoor unit with air
flow amount Q
Qa...Estimated amount of fresh air
3
intake without D <m
90-
Fresh air intake hole
(Knockout)
Max 1.74m³/min
Max 1.86m³/min
Max 1.86m³/min
Max 2.14m³/min
CN51 5
on
indoor unit
1
board
Connector (5P)
Indoor unit side
Multiple remote
controller adapter
PAC-SA88HA-E
Characteristic diagram of fresh air taken capacity
3 /min>
50.0
<Pa>
0.0
<Pa>
<Pa>
-50.0
<Pa>
<Pa>
/min>
-100.0
0.0 0.5
14
Unit : mm
4-{2.8
Be sure to secure insulation
material by tape, etc.
Green
Yellow
Orange
Red
Brown
Installation at site
Multiple remote
controller adapter
Be sure to secure insulation
PAC-SA88HA-E
material by tape, etc.
Indoor controller board
Distance between indoor
controller board and relay
must be within 10m.
CN51
1.0 1.5
3
Air flow (m /min)
~
MB
2 intakes
1 intake
2.0 2.5