Fujitsu General ASHG07KPCE, Service Manual

Page: 119 / 132

7-6. 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)
7-7. 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)
-4°C
Off
On
Tn
Tn
-2°C
When the jumper wire (JM2) is disconnected:
5°C
Off
On
Tn
Tn
7°C
7-8. Electronic expansion valve control
The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the table below.
Operation mode Pulse range
Cooling/dry mode
Between 52 and 480 pulses
Heating mode
NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex-
pansion valve is operated (528 pulses are input to the closing direction).
7-9. Prevention to restart for 3 minutes (3 minutes st)
When the compressor fails to start for the number of times below, it does not enter operation status
for 3 minutes.
Retry number 10
Retry set number 10
When the compressor fails to start in the retry set number above, the compressor is stopped.
7-6. Fresh air control
- (04-25) -
7. Various control
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS