26
OCH737
10 TROUBLESHOOTING
10-2. CHECK POINT UNDER TEST RUN
10-2-1. Before test run
•
After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant leak-
age, 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.
•
Do not use 500 V Megger to indoor/outdoor connecting wire terminal block (S1, S2, S3) and remote controller terminal block
(1, 2). This may cause malfunction.
•
Make sure that test run switch (SW4) is set to OFF before turning on power supply.
•
Turn on power supply 12 hours before test run in order to protect compressor.
•
For specific models which require higher ceiling settings or auto-recovery feature from power failure, make proper changes of
settings referring to the description of “11. FUNCTION SETTING”.
Make sure to read operation manual before test run. (Especially items to secure safety.)
10-1. TROUBLESHOOTING
<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.
Unit conditions at service
Check code
Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed
Judge the problem and take a corrective action according
to “10-4. SELF-DIAGNOSIS ACTION TABLE”.
Not displayed
Conduct troubleshooting and ascertain the cause of the
trouble according to “10-5. TROUBLESHOOTING OF
PROBLEMS”.
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.
3
There is no abnormality in electrical component, controller
board, remote controller, etc.
Not logged
1
Re-check the abnormal symptom.
2
Conduct troubleshooting and ascertain the cause of the
trouble according to “10-5. TROUBLESHOOTING OF
PROBLEMS”.
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, remote controller,
etc.
