8. HOW TO OPERATE DISPLAY UNIT
8.1. Various setting methods
WARNING
Never touch electrical components such as the terminal blocks or reactor except the
switch on the display board. It may cause a serious accident such as electric shock.
CAUTION
Once refrigerant charging is completed, be sure to open the valve prior to performing
the local settings. Otherwise, the compressor may fail.
Discharge any static electricity from your body before touching the push switches. Never
touch any terminal or pattern of any parts on the control board.
The positions of the switches on the outdoor unit control board are shown in the gure •
below.
Terminal blocks
Reactors
Various settings can be adjusted by changing DIP switches and push switches on the •
board of the outdoor unit.
DIP switch
Push
switches
LED display
The printed characters for the LED display are shown below.•
LED display part
(3) Secure the cables using the cable clips under the terminal blocks, and then secure
the cables using the cable clips attached to the base of the valves.
Cable clip
(4) Be sure to install the insulation sheet after the wiring is complete.
sd
7. PIPE INSTALLATION-2
WARNING
Install the insulated pipes so that they do not touch the compressor.
7.1. Installing insulation
Use an insulation on the refrigerant pipes to prevent condensation and dripping. •
(Fig. A)
Determine the thickness of the insulation material by referring to Table A.•
Table A, Selection of insulation
(for using an insulation material with equal heat transmission rate or below
0.040 W/(m·k))
Relative humidity
[mm (in.)]
Insulation material
Minimum thickness [mm]
70%
or more
75%
or more
80%
or more
85%
or more
Pipe
diameter
6.35 (1/4) 8 10 13 17
9.52 (3/8) 9 11 14 18
12.70 (1/2) 10 12 15 19
15.88 (5/8) 10 12 16 20
19.05 (3/4) 10 13 16 21
If the ambient temperature and relative humidity exceed 32 °C, increase the level of heat
insulation for the refrigerant pipes.
7.2. Filling with putty
WARNING
Fill the piping holes with putty (supplied locally) to avoid any gap (Fig A). If small animals
such as insects enter the external unit, a short circuit may be caused near electrical
components in the service panel.
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.
Fig. A
Insulation
Putty
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