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7-6. Caution for Pump Down
Pump down means refrigerant gas in the system is returned to the outdoor unit.
Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit.
(Refer to the Service Manual)
CAUTION
●
This outdoor unit cannot collect more than the rated refrigerant amount as shown by the
nameplate on the back.
●
If the amount of refrigerant is more than that recommended, do not conduct pump down.
In this case use another refrigerant collecting system.
7-7. Self-Diagnosis Function Table and Contents of Alarm Display
How to know LEDs 1 and 2 alarm display on outdoor unit control P.C. board
LED 1
LED 2
Contents of Alarm Display
Alarm display
After LED1 blinks M times, LED2 blinks N times.
This will be repeated.
Number of blinks
Type of alarm
N = number of alarm No.
M
2
Alarm P
3
Alarm H
4
Alarm E
5
Alarm F
6
Alarm L
For example: After LED1 blinks twice, LED2 blinks 17 times. This will be repeated.
The alarm shows “P17”.
Alternating
( : Blink)
Connect the outdoor unit maintenance remote controller to the RC plug (3P, BLU) on outdoor main unit control
P.C. board and make confirmation.
n
Self-Diagnosis Function Table
• Cause and countermeasure against the symptom of auto address failure
Symptom
Cause and countermeasure
•
When turning ON power to the outdoor main unit, LEDs 1 and
2 illuminate or blink excluding going out.
Auto address setting is not available.
See “Contents of Alarm Display” and make corrections.
• When auto address setting by the remote controller begins, the
alarm display appears immediately.
• When auto address setting by the remote controller begins, no
display appears.
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned ON power?
• Auto address setting begins but finishes improperly.
Symptom
Cause and countermeasure
•
Soon after a few seconds or after a few minutes, the alarm
content is displayed on the remote controller.
See “Contents of Alarm Display” and make a correction.
•
After a few minutes when auto address setting begins, the
compressor may occasionally start and stop several times.
LEDs 1 and 2 on outdoor unit control P.C. board show the
display of auto address setting with blinking alternately but
LEDs 1 and 2 do not indicate the completion of auto address
setting (go out).
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned ON power?
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