5. Blinking Inspection Display on the Remote Controller
Blinking inspection display (2) (compressor magnet SW seizing detection)
Alarm code | (Blinking inspection display) |
|
|
Alarm meaning | Compressor magnet SW seizing detected |
| Status: Although an outdoor unit exists where the outdoor unit fan is running, no compressors in |
| the system are operating. |
| Because the fan is running only at the outdoor unit where seizing was detected, check |
| the corresponding outdoor unit. |
| * The fan may also run on its own when fan cracking prevention control is in effect |
| or when snowfall sensor input is present. Therefore monitor for approximately 10 |
| minutes if the outdoor unit fans are operating at multiple units. |
Alarm conditions | Current is detected in the CT circuit when the compressor is stopped. |
| (1) This control is not engaged for the first 30 seconds after the compressor turns ON ¡¡OFF. |
| (2) For 1 minute following the first 30 seconds after the compressor turned ON ¡¡OFF, the |
| threshold for the detected current is 10 A or more continuing for 2 seconds. |
| (3) All times other than the above: |
| • If the |
| more continuing for 5 seconds. |
| • If the |
| continuing for 2 seconds. |
Probable cause | (1) Magnet SW malfunction |
| • The magnet SW has seized, and the compressor is continuing to run. |
| ¡ Even when the power is turned OFF, the primary side and secondary side contacts |
| remain together. |
| • The conditions of magnet SW operation are poor (difficult to open). |
| ¡ When a magnet SW is used in a DC circuit, it may be difficult for the SW to open at times. |
| In an AC circuit the magnet SW should open instantaneously as long as the current is |
| within the allowable range. However, this kind of trouble can occur if excessive current |
| flows, and may prevent the SW from opening. |
| (2) CT circuit failure or PCB failure (A/D failure) |
| • CT circuit contact failure |
| ¡ Check that the connector is not partially disconnected. |
| Wiggle the connector to check the connection.* |
| * These symptoms will not occur if the connector is completely disconnected or the wire is |
| cut. In these cases alarm Hx3 occurs. |
| • Current of 7A or higher was detected although the compressor was stopped, or a higher |
| current was detected at occasional intervals. |
| • The compressor continues to operate at a time when the outdoor unit should be stopped |
| (such as when all indoor units are stopped). |
| ¡ Check whether or not 200 V is output from the PCB to the magnet SW. If the voltage is |
| output, there is a PCB failure. |
| (3) Installation error |
| • CT1 connector is connected to the compressor 2 side |
| • CT1 circuit is connected to the compressor 2 side |
| • CT2 connector is connected to the compressor 1 side |
| • CT2 circuit is connected to the compressor 1 side |
| (4) Electrical noise |
Correction | (1) Replace the CT circuit. |
| (2) Replace the magnet SW. |
| (3) Replace the PCB. |
| If the above probable causes are not the cause of the alarm, it is possible that in rare cases |
| the alarm may be caused by the effects of noise. See notes. |
Notes | The effects of electrical noise are difficult to identify unless a PC is connected and the conditions |
| are monitored for a long period of time. |
5
5 - 27
