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9.1.3 Error displays
• When error occurs, "Err" and "Number of errors occurred" are alternately displayed on
the 7 segment display every 1 second.
• For the content of error, please refer to the "10.2. Error codes".
• When error codes are displayed, all the error codes can be confi rmed by pressing the
"SELECT" button.
Example:
When "Indoor unit capacity error [E221]" and "Indoor unit duplicate address error [E261]"
occurred.
9.2. Test run
Before the test operation, check the following items.
(1) Is there a gas leakage? (At pipe connections {fl ange connections and brazed areas})
(2) Is the system charged with the specifi ed volume of refrigerant?
(3) Is the refrigerant circuit address correct?
(4) Is a breaker installed at the power supply cable of outdoor unit?
(5) Are the cable connected to the terminals without looseness, and in accordance with
the specifi cations?
(6) Are the initial settings of the switches of the outdoor unit correctly confi gured?
(7) Is the 3-way valve of the outdoor unit open? (Gas pipe and liquid pipe)
(8) Is power supplied to the crank case heater for more than 12 hours? Electricity current
in short period of time may result in compressor damage.
(9) Are all the indoor units within the same coolant system connected to the power? Op-
erating indoor units which are not connected to the power may result in malfunctions.
(10) Is Indoor unit connection check performed? Test run doesn't operate if Indoor unit
connection check is not performed.
After checking that the above items are all in order, refer to "9.3.
Test run method" to test operation the unit.
If there are problems, adjust immediately and recheck.
9.3. Test run method
Be sure to confi gure test run settings only when the outdoor unit has stopped oper-
ating.
• Depending on the communication status between the indoor and outdoor units, it may
take several minutes for the system to start operating after settings for the test run are
complete.
• After the test run settings are complete, the outdoor unit and the connected indoor
units will start operating. Room temperature control will not activate during test opera-
tion (continuous operation).
• If a knocking sound can be heard in the liquid compression of the compressor, stop
the unit immediately and then energize the crank case heater for a suffi cient length of
time before restarting the operation.
Perform test operation for each refrigerant system.
You can set "cooling test operation" or "heating test operation" with the push button on the
outdoor unit PC board.
En-17
(*1) When the address of the overlap indoor
unit is displayed, press and hold the "EN-
TER" button for more than 3 seconds.
(*1)
[Ad + address number]
(*2) When errors other than the address of
the overlap indoor unit exist, press "SE-
LECT" button to switch to the next error.
If error occurs, it will display "-".
Test operation setting method
Use the "MODE/EXIT", "SELECT", and "ENTER" buttons on the indoor unit PC board to
confi gure settings according to the procedures below.
Function settings
First 2 digits Last 2 digits
(*2)
Press the "ENTER" button for
more than 3 seconds.
Press the "ENTER" button for
more than 3 seconds.
EXIT
After the test operation is complete, turn off the power. Attach the cover of the electrical
component box and the front panel of the outdoor unit.
NOTE:
• Check that the indoor and outdoor units connected to the same refrigerant system are
operating normally.
• When indoor or outdoor units are not operating, or when the indoor and outdoor units
of other refrigerant systems are operating, the indoor/outdoor unit address are not
confi gured correctly.
• The system will not operate normally with an incorrect DIP switch setting.
Stop the system immediately and recheck the DIP switch setting.
(When [F4] to [F9] are displayed, continue to
press the SELECT button until [F3] is displayed.)
Settings for starting test run
operation
For heating operation, press the "SE-
LECT" button until "01" is displayed.
Press the "ENTER" button for
more than 3 seconds.
This will be dis-
played when the
cooling test opera-
tion is complete.
This will be
displayed after 5
seconds.
Settings for stopping test run
operation
Press the "ENTER" button for
more than 3 seconds.
This will be dis-
played when the
cooling operation
mode is canceled.
This will be
displayed after 5
seconds.
This will be dis-
played when the
heating test opera-
tion is complete.
This will be
displayed after 5
seconds.
This will be dis-
played when the
heating operation
mode is canceled.
This will be
displayed after 5
seconds.