En-23
8. 4. Installing insulation
• Install insulation material after conducting the “8.1 Sealing Test”.
• To prevent condensation and water droplets, install insulation material on the refriger-
ant pipe.
• Refer to the table to determine the thickness of the insulation material.
• If the outdoor unit is installed at a level that is higher than the indoor unit, the water
that has condensed in the 3-way valve of the outdoor unit could travel to the indoor
unit.
Therefore, use putty in the space between the pipe and the insulation to prevent the
entry of water.
Putty
Insulation
Table. Selection of insulation
(for using an insulation material with equal heat transmission rate or below
0.040W/(m·k))
Insulation material
Minimum thickness (mm)
Relative humidity
≤
70%
≤
75%
≤
80%
≤
85%
Pipe diameter (mm)
6.35
8
10
13
17
9.52
9
11
14
18
12.70
10
12
15
19
15.88
10
12
16
20
19.05
10
13
16
21
22.22
11
13
17
22
28.58
11
14
18
23
34.92
11
14
18
24
41.27
12
15
19
25
* When an ambient temperature and relative humidity exceed 32 °C, please strength-
en heat insulation of refrigerant pipe.
9. TEST RUN
9. 1. Pre-test run check items
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 every outdoor unit?
5
Are the cables 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?
Operating indoor units which are not connected to the power may result in mal-
functions.
After checking that the above items are all in order, refer to “9.2 Test
operation method” to test operation of the unit.
If there are problems, adjust immediately and recheck.
9. 2. Test operation method
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, all the outdoor units 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 (more than 12 hours) 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 con
fi
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 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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