Panasonic U-8ME1E81, Руководство по обслуживанию

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2WAY SYSTEM
Trouble Diagnosis
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5. Blinking Inspection Display
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
Õ
OFF.
(2) For 1 minute following the first 30 seconds after the compressor turned ON
Õ
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 low-pressure SW has not activated, the threshold for the detected current is 7A or
more continuing for 5 seconds.
• If the low-pressure switch has activated, the threshold for the detected current is 7A or more
continuing for 2 seconds.
Probable cause (1) Magnet SW malfunction
• The magnet SW has seized, and the compressor is continuing to run.
Õ
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).
Õ
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
Õ
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).
Õ
Check whether or not 220 - 240 V is output from the PCB to the magnet SW. If the voltage
is output, there is a PCB failure.
(3) Installation error
• CT2 connector is connected to the compressor 3 side
• CT2 circuit is connected to the compressor 3 side
• CT3 connector is connected to the compressor 2 side
• CT3 circuit is connected to the compressor 2 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.
6. Inspection of Parts
2WAY SYSTEM
Trouble Diagnosis
(1) High-Pressure Switch (63PH1, 63PH2, 63PH3), Optional High-Pressure Switch for Renewal (63PH4,63PH5)
63PH1
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
(2) Electronic Control Valve (MOV1, MOV2, MOV4)
After removing the connector from the PCB, use the following methods to check the valves.
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω or , replace the coil.)
(3) Crankcase Heater
•
Connect a clamp meter to 1 of the 2 crankcase heater wires and measure the current.
The current is normal if the result is 0.15 A or higher.
(As a guide, the current should be 0.1 A (1 9 8 V) – 0. 2 A (2 64 V).)
MOV1 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN64 connector (5P, white)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω or , replace the coil.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω o r , replace the coil.)
MOV2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN63 connector (5P, red)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
is normal.)
MOV4 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN57 connector (5P, blue)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
is normal.)
63PH2
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH3
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH4
/63PH5
Disconnect the CN3 connector (3P, white) from the outdoor unit control panel.
Disconnect the CN4 connector (3P, red) from the outdoor unit control panel.
Disconnect the CN5 connector (3P, yellow) from the outdoor unit control panel.
Disconnect the CN42 connector (4P, white) from the outdoor unit control panel.
Measure the resistance between socket pins 1 and 2. The resistance is OK if the result is 0 Ω.
Measure the resistance between socket pins 3 and 4. The resistance is OK if the result is 0 Ω.
SM830214-03̲2WAY̲SYSTEM.indb 30 2013/06/07 21:42:15
SM830205-04_2WAY_VRF_Euro.indb 30 15/01/20 15:29:49