6
4. Installing the refrigerant piping
4.3. Refrigerant piping (Fig. 4-5)
1) Indoor unit
Caution:
Before connecting right, lower, left or left rear piping, connect the supplied L-
shaped connection pipe
B
to the on-site piping.
When using commercially available copper pipes:
Refrigerant and Drainage Piping Sizes
Item
Model
RP2.5, 3
RP4
Liquid
ODø9.52 (3/8")
ODø9.52 (3/8")
Gas
ODø15.88 (5/8")
ODø19.05 (3/4")
Unit drainage piping
PVC pipe IDø20 (13/16")
Refrigerant
piping
Liquid pipe
Gas pipe
Insulation material
3
Band (large)
4
Band (small)
4
Band (small)
4
Tape
Thermal insulating
material for
refrigerant piping
Thermal insulating
material for liquid pipe
Liquid pipe
ø
20
O.D
Drain socket
Apply PVC adhesive
On-site drain pipe
Unit’s drain pipe
Felt tape
5
Liquid pipe
Drain pipe
Gas pipe
5. Drainage piping work (Fig. 5-1)
• Drain pipes should have an inclination of 1/100 or more.
• Use PVC pipe VP-20 for drain piping.
• Drain pipes can be cut with a knife at the connection point according to the on-site
conditions.
• When connecting the VP-20, use adhesive to attach the supplied drain socket.
• To prevent dripping condensation, put felt tape
5
over the insulation materials on
the refrigerant and drain pipes within the unit as shown in the diagram.
Caution:
The drain pipe should be installed according to this Installation Manual to en-
sure correct drainage. Thermal insulation of the drain pipes is necessary to
prevent condensation. If the drain pipes are not properly installed and insu-
lated, condensation may drip on the ceiling, floor or other possessions.
6. Electrical work
6.1. Indoor unit (Fig. 6-1)
1
Remove the right side panel.
To do this, remove the screws on the lower and right sides.
Remove the securing screw on the terminal board cover to take away the cover.
2
Connect the power, control line. (3
×
2.5 mm
2
2 poler).
s
This cables shall not lighter than polychloroprene sheathed flexible cord.
(design 245 IEC 57)
s
Fix power source wiring to control box using buffer bushing for tensile force.
(PG connection or the like.)
• Since the electric box may need to be pulled out for servicing or other occasions,
wires must have enough slack.
• Class 3 grounding work must be conducted (grounding wire size: 2.5 mm
2
or more).
After wiring is completed, reinstall the parts in the reverse order of removal.
Warning:
Wiring should be done so that the power lines are not subject to tension. Oth-
erwise, heat may be generated or fire may occur.
A
Terminal board cover
B
Screw
C
Band
D
Printed circuit board cover
E
Right side panel
F
Coupler connector
G
Terminal board for remote controller (option)
H
Terminal board for control lines from the outdoor unit
I
Power supply wiring & connection wiring
J
Cord clamp
1
2
Fig. 5-1
Fig. 6-1
Fig. 4-5
A
B
C
D
E
F
F
I
J
G
H
1
S1
S2
S3
2
