8-5. 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.
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.
8-6. Meaning of Alarm Messages
Table of
Alarm messages are indicated by the blinking of LED 1 and 2 (D72, D75) on the outdoor unit PCB. They are also displayed on
the wired remote controller.
●Viewing the LED 1 and 2 (D72 and D75) alarm displays
LED 1 |
| LED 2 |
| Alarm contents |
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Alternating |
| LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats. |
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| M = 2: P alarm 3: H alarm 4: E alarm 5: F alarm 6: L alarm |
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| N = Alarm No. |
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| Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats. | ||
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| Alarm is “P17.” |
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( : Blinking) |
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Possible cause of malfunction |
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Serial |
| Remote controller is detecting | Error in receiving serial communication signal. |
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error signal from indoor unit. | (Signal from main indoor unit in case of group control) | <E01> | ||||
errors |
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| Ex: Auto address is not completed. |
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| Error in transmitting serial communication signal. | <E02> | ||
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| Indoor unit is detecting error signal from remote controller (and system controller). | <<E03>> | ||
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| Indoor unit is detecting error | Error in receiving serial communication signal. |
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| signal from outdoor unit. | When turning on the power supply, the number of connected | E04 | |
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| indoor units does not correspond to the number set. (Except R.C. |
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| address is “0.”) |
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| Error of the outdoor unit in receiving serial communication signal | <E06> |
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| from the indoor unit. | |
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| Improper setting of indoor unit or | Indoor unit address setting is duplicated. | E08 | |
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| remote controller. |
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| Remote controller address connector (RCU. ADR) is duplicated. | <<E09>> | ||
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| (Duplication of main remote controller) | |
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| During auto. address setting, | Starting auto. address setting is prohibited. |
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| number of connected units does | This alarm message shows that the auto address connector CN100 | E12 | |
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| not correspond to number set. | is shorted while other RC line is executing auto address operation. |
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| Error in auto. address setting. (Number of connected indoor units | E15 |
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| is less than the number set) | |
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| When turning on the power |
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| Error in auto. address setting. (Number of connected indoor units | E16 | ||
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| supply, number of connected | |||
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| is more than the number set) | |||
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| units does not correspond to |
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| No indoor unit is connected during auto. address setting. | E20 | ||
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| number set. | |||
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| (Except R.C. address is “0.”) | Error of outdoor unit address setting. | E25 | |
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| Indoor unit communication error | Error of main indoor unit in receiving serial communication signal | E18 | |
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| of group control wiring. | from sub indoor units. | ||
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Continued
79
