En-20
MODE/EXIT
SELECT
ENTER
ENTER
ENTER
(*1)
(*2)
(*1) The number of connected
indoor units
(*2) Volume ratio of the indoor
units connection
Ex.) When 8 units are connected
Ex.) When the ratio is 120%
Please refer to the following “Error displays”
for details.
When it
fi
nishes normally, nothing will be displayed on
7 segment display.
When error occurs
Con
fi
rm the number of connected indoor
•
units and the volume ratio of the indoor
units connection.
Exit indoor unit connection check
•
mode.
Error displays
9. 1. 4.
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 display mode”.
•
When error codes are displayed, all the error codes can be con
fi
rmed by pressing the
•
“SELECT” button.
Example: When “Indoor unit capacity error [E221]”, “Connection unit number error (indoor
unit) [E242]” 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]
Test run
9. 2.
Before the test operation, check the following items.
Is there a gas leakage? (At pipe connections {
fl
ange connections and brazed
①
areas})
Is the system charged with the speci
fi
ed volume of refrigerant?
②
Is the refrigerant circuit address correct?
③
Is a breaker installed at the power supply cable of outdoor unit?
④
Are the cable connected to the terminals without looseness, and in accordance with the
⑤
speci
fi
cations?
Are the initial settings of the switches of the outdoor unit correctly con
fi
gured?
⑥
Is the 3-way valve of the outdoor unit open? (Gas pipe and liquid pipe)
⑦
Is power supplied to the crank case heater for more than 12 hours? Electricity cur-
⑧
rent in short period of time may result in compressor damage.
Are all the indoor units within the same coolant system connected to the power?
⑨
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
⑩
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.
Test run method
9. 3.
Be sure to con
fi
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 suf
fi
cient length
of time before restarting the operation.
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