En-20
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 speci
fi
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 speci
fi
cations?
(6) Are the initial settings of the switches of the outdoor unit correctly con
fi
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 con
fi
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 suf
fi
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.
Test operation setting method
Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the indoor unit PC board to
con
fi
gure settings according to the procedures below.
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 displayed
when the heating
operation mode is
canceled.
This will be displayed
after 5 seconds.
This will be displayed
after 5 seconds.
This will be displayed
when the heating
operation mode is
canceled.
Press the “ENTER” button for
more than 3 seconds.
This will be displayed
when the heating 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
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 con-
fi
gured correctly.
• The system will not operate normally with an incorrect DIP switch setting.
Stop the system immediately and recheck the DIP switch setting.
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