Fujitsu ACUH09LUAS1, Service Manual

Page: 132 / 153

7-4. Fresh air control
The fan motor for Fresh Air is operated in synchronization with the indoor fan operation as below.
Operation
Stop
Operation
Stop
Fan motor
(Indoor unit)
Fan motor
(for Fresh Air)
7-5. Compressor preheating
By preheating the compressor, warm airflow is quickly discharged when the operation is started.
• Triggering condition
– 30 minutes after compressor stopped.
– Outdoor unit heat exchanger temperature (Tn)
Off
On
Tn
Tn
28.4 °F
(-2°C)
24.8 °F
(-4°C)
→hen the jumper wire (JM2) is disconnected:
41.0 °F
(5°C)
Off
On
Tn
Tn
44.6 °F
(7°C)
7-4. Fresh air control
- (04-26) -
7. Various control
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S