En-9
■
Cable preparation
Keep the earth (ground) wire longer than the other wires.
NOTES:
When using a sealed cable
2-1/8 in (60 mm)
Power supply cable
or connection cable
Earth wire
2-15/16 in (75 mm)
or more
■
Wiring procedure
(1)
Remove the outdoor unit switch cover.(Refer to “3.5.1. Switch cover removal”.)
(2)
Remove the outdoor unit conduit cover. (Refer to “3.10.1. Conduit installation”.)
(3)
Connect the power supply cable and the connection cable to terminal.
(4)
Fasten the power supply cable and connection cable with cable tie (accessories).
(5)
Install the conduit cover.(Refer to “3.10.1. Conduit installation”.)
L2
L1
Cut off the
excess
Thread the cable tie through
the hole and tighten securely
Cable tie (accessories)
4. TEST RUN
Make a test run in accordance with the installation manual for the indoor unit.
5. FINISHING
5.1. Installing insulation
• Install insulation material after conducting “3.7. Sealing test”.
• To prevent condensation and water droplets, install insulation material on the refrigerant
pipe.
• Use insulation with heat resistance above 248 °F (120 °C).
• Refer to the table to determine the thickness of the insulation material.
■
Selection of insulation
(Use an insulation material with equal heat transmission rate or below 0.040
W/(m·k))
Insulation material minimum thickness [in (mm)]
Relative humidity
≤
70%
≤
75%
≤
80%
≤
85%
Pipe diameter
[in (mm)]
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)
3/8 (10)
1/2 (12)
5/8 (16)
13/16 (20)
3/4 (19.05)
3/8 (10)
1/2 (13)
5/8 (16)
13/16 (21)
* When the ambient temperature and relative humidity exceed 89.6 °F (32 °C) (DB) and
85% respectively, please strengthen the heat insulation of refrigerant pipe.
6. PUMP DOWN
■
Pump down operation (forced cooling operation)
To avoid discharging refrigerant into the atmosphere at the time of relocation or disposal,
recover refrigerant by doing the forced cooling operation according to the following proce-
dure.
(1) Conduct preliminary operation for 5 to 10 minutes using the forced cooling opera-
tion. Start the forced cooling operation. Keep on pressing the [MANUAL AUTO] of the
indoor unit for more than 10 seconds. The operation indicator lamp and timer indicator
lamp will begin to flash simultaneously during test run. (The forced cooling operation
cannot start if the [MANUAL AUTO] is not kept on pressing for more than 10 seconds.)
(2) Close the valve stem of 2-way valve completely.
(3) Continue the forced cooling operation for 2 to 3 minutes, then close all the valve stems
on the 3-way valves
(4) Stop the operation.
• Press the [START/STOP] of the remote controller to stop the operation.
• Press the [MANUAL AUTO] when stopping the operation from the indoor unit side.
(It is not necessary to press down for more than 10 seconds.)
CAUTION
Please check the refrigerant circuit for any leaks before starting the pump down
operation.
Do not proceed with the pump down operation if there is no refrigerant left in the
circuit due to bent or broken piping.
During the pump down operation, be sure to turn off the compressor before removing
the refrigerant piping.
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11/19/2019 9:02:48 AM
