Fujitsu B24LDC, Service Instruction

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10. 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 following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor, the
indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature
sensor.
11. TEST OPERATION CONTROL
Under the condition where the air conditioner runs, press the test operation button of the remote
control, and the test operation control mode will appear. During test running, the operation lamp
and timer lamp of the air conditioner body twinkle simultaneously. Set the test operation mode,
and the compressor will continue to run regardless of whether the room temperature sensor detects.
The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.
At the time when the air conditioner is switched from the cooling mode to heating mode, the
compressor is stopped, and the four-way valve is switched in 3 minutes later after the compressor
stopped.
When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically started with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, since the timer operation time
is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/2 sec OFF)
the indoor unit body timer lamp.
[Operation contents memorized when the power is interrupted]
Operation mode
Set temperature
Set air flow
Timer mode and timer time
Set air flow Direction
Swing
The test operation mode is released if 60 minutes have passed after setting up the test operation.
12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )
13. FOUR-WAY VALVE EXTENSION SELECT
14. AUTO RESTART
05-13
AS*B24LDC
Pulse range
60 480 pulse
(1) Pulse range of EEV
(2) The EEV is set up at 480 pulses when the compressor is stopped.
(3) Intialization (Input of 528 pulses toward closing direction) is operated under the
following condition.
* When the power is turned on.
* 3 hours has passed since the last initialization, and 3 minutes has passed after
the compressor stop.
(If 12 hours has passed since the last initialization, the compressor is compulsorily
stopped.)