Mitsubishi Electric PUZ-HWM140VHA, Руководство по обслуживанию

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OCH748
TROUBLESHOOTING 9
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the control board of outdoor unit. Actions to be taken
for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check
the contents below before investigating details.
9-1. TROUBLESHOOTING
9-2. CHECKPOINT UNDER TEST RUN
Before test run
• After installation of outdoor units, piping work and electric wiring work, re-check that there is no water leakage, loosened
connections and incorrect polarity.
• Measure impedance between the ground and the power supply terminal block (L, N) on the outdoor unit by 500 V Megger
and check that it is 1.0 M or over.
• Turn on power supply 12 hours before test run in order to protect compressor.
• Make sure to read operation manual before test run. (Especially items to secure safety.)
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed
Judge what is wrong and take a corrective action
according to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
Not displayed Conduct troubleshooting and ascertain the cause of the
trouble.
The trouble is not reoccurring.
Logged
1
Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2
Reset check code logs and restart the unit after finishing
service.
1
There is no abnormality in electrical component,
controller board, etc.
Not logged
1
Re-check the abnormal symptom.
2
Conduct troubleshooting and ascertain the cause of the
trouble.
3
Continue to operate unit for the time being if the cause
is not ascertained.
4
There is no abnormality concerning of parts such as
electrical component, controller board, etc.