En-20
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.
SELECT
ENTER
ENTER
ENTER
SELECT
ENTER
(*1) When the address of the overlap
indoor unit is displayed, press and
hold the “ENTER” button for more
than 3 seconds.
(*2) When errors other than the address
of the overlap indoor unit exist,
press “SELECT” button to switch to
the next error.
If error occurs, it will display “-”.
(*1)
(*2)
[Ad + address number]
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 cur-
rent 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?
Operating indoor units which are not connected to the power may result in malfunctions.
@
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
operating.
• 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
operation (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 run" or “heating test run” with the push button on the outdoor unit
PC board.
Test operation setting method
Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the outdoor unit PC board to
confi gure settings according to the procedures below.
ENTER
or
or
or
ENTER
ENTER
Settings for starting
test run operation
Settings for stopping
test run operation
Press the “ENTER” button
for more than 3 seconds.
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
displayed after
5 seconds.
This will be dis-
played when the
heating operation
mode is canceled.
Press the “ENTER” button
for more than 3 seconds.
This will be
displayed when
the cooling test
operation is
complete.
This will be
displayed after
5 seconds.
This will be
displayed after
5 seconds.
This will be
displayed when
the heating test
operation is
complete.
Press the “ENTER” button
for more than 3 seconds.
First 2 digits
Last 2 digits
(When [F4] to [F9] are displayed, continue to
press the SELECT button until [F3] is displayed.)
For heating operation, press the
“SELECT” button until “01” is displayed.
Function settings
ENTER
MODE/EXIT
SELECT
SELECT
SELECT
ENTER
ENTER
ENTER ENTER
SELECT SELECT
MODE/EXIT
EXIT
After the test operation is complete, turn off the power. Attach the cover of the electrical
compartment 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 or
DIP switch for the number of connected slave units 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.
9380545149-02_IM_EN.indd 209380545149-02_IM_EN.indd 20 9/7/2021 1:38:55 PM9/7/2021 1:38:55 PM
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