En-28
9.4. Installing thermal insulation
• Install thermal insulation material after conducting the “9.1.
Sealing test”.
• To prevent condensation and water droplets, install ther-
mal insulation on the refrigerant pipe.
• Refer to the table to determine the thickness of the ther-
mal insulation.
• 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 duct seal (locally purchased) in the space
between the pipe and the thermal insulation to prevent the
entry of water.
Duct seal (locally
purchased)
Insulation
Selection of thermal insulation
Use an thermal insulation with equal heat transmission rate or below 0.023 BTU/ft·h·°F
(0.040 W/m·k)
Pipe diameter
[in (mm)]
Thermal insulation minimum thickness per relative humidity
[in (mm)]
≤ 70% ≤ 75% ≤ 80% ≤ 85%
1/4 (6.35) 5/16 (8) 3/8 (10) 1/2 (13) 11/16 (17)
3/8 (9.52) 3/8 (9) 7/16 (11) 9/16 (14) 11/16 (18)
1/2 (12.70)
3/8 (10)
1/2 (12)
9/16 (15) 3/4 (19)
5/8 (15.88)
5/8 (16)
13/16 (20)
3/4 (19.05)
1/2 (13)
13/16 (21)
7/8 (22.22)
7/16 (11)
11/16 (17) 7/8 (22)
1-1/8 (28.58)
9/16 (14) 11/16 (18)
7/8 (23)
1-3/8 (34.92) 15/16 (24)
1-5/8 (41.27) 1/2 (12) 9/16 (15) 3/4 (19) 1 (25)
* When an ambient temperature and relative humidity exceed 90 °F (32 °C), please
strengthen heat insulation of refrigerant pipe.
10. TEST RUN
10.1. Pre-check for test run
Before the test operation, check the following items.
(1) Is there a gas leakage? (At pipe connections {flange connections and brazed areas})
(2) Is the system charged with the specified volume of refrigerant?
(3) Is the refrigerant system 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 specifications?
(6) Are the initial settings of the switches of the outdoor unit correctly configured?
(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 refrigerant system connected to the power?
Operating indoor units which are not connected to the power may result in malfunc-
tions.
(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
“10.2. Test run method” to test operation the unit.
If there are problems, adjust immediately and recheck.
10.2. Test run method
Be sure to configure 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 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 sufficient 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 main PC board.
Test operation setting method
Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the outdoor unit main PC
board to configure settings according to the procedures below.
: Press the “MODE/EXIT” button.
: Press the “SELECT” button.
: Press the “ENTER” button.
: Press the “ENTER” button for more than 3 seconds.
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.
Press the “ENTER” button for
more than 3 seconds.
This will be displayed when the cooling operation mode is
canceled.
This will be displayed
when the cooling test
operation is complete.
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.
First 2 digits
Last 2 digits
Set to Function mode [F3].
(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
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.
NOTES:
• 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
configured correctly.
• The system will not operate normally with an incorrect DIP switch setting.
Stop the system immediately and recheck the DIP switch setting.
10.3. Checklist
Check description Check method Criteria
1
High and low pressure values
are normal.
Check it with a pres-
sure gauge.
Cooling: low pressure ap-
prox. 0.8 MPa
Heating: high pressure
approx.
3.0 MPa
2
Drain water is discharged
smoothly through the drain
hose.
Check it by pouring
water.
―
3
Indoor and outdoor unit fans
are operating.
Check them visually. ―
4
Compressor operates after
the indoor unit operates.
Check the operating
sound.
―
5
Difference between inlet and
outlet temperatures is normal.
Measure the inlet and
outlet temperatures.
Temperature difference
10 degrees
6 Error is not displayed.
Check the 7-segment
display.
Error blinking or no error
code display
9378945722-05_IM_L3.indb 289378945722-05_IM_L3.indb 28 2023/3/24 9:23:512023/3/24 9:23:51
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