7
English
<Precautions when laying power wiring>
• Wiring of different thicknesses cannot be connected to the power ter-
minal block.
(Slack in the power wiring may cause abnormal heat.)
• Use sleeve-insulated round pressure terminals for connections to
the power terminal block. When none are available, connect wire of
the same diameter to both sides, as shown in the figure.
Follow the instructions below if the wiring gets very hot due to
slack in the power wiring.
• For wiring, use the designated power wire and connect firmly, then
secure using the included clamping material to prevent outside pres-
sure being exerted on the terminal board.
• Use an appropriate screwdriver for tightening the terminal screws.
A screwdriver with a small head will strip the head and make proper
tightening impossible.
• Over-tightening the terminal screw may break it.
See the table below the tightening torque of the terminal screws.
6-3 How to connect the power supply wiring
CAUTION
Attach a ground fault circuit interrupter.
• A ground fault circuit interrupter is required in order to prevent elec-
tric shock and fires.
CAUTION
• The wiring should be selected in compliance with local specifica-
tions. See the table above.
• Always turn off the power before doing wiring work.
• Grounding should be done in compliance with local laws and reg-
ulations.
• Attach a ground fault circuit interrupter.
(This unit has an inverter, so an interrupter capable of handling
high frequencies is needed to prevent malfunction of the interrupter
itself.)
• As shown in figure 18, when connecting the power supply wiring to
the power supply terminal block, be sure to clamp securely.
• Once wiring work is completed, check to make sure there are no
loose connections among the electrical parts in the control box.
(Refer to figure 18)
1.
Shutoff valve attachment plate
2.
Clamp (accessory)
3.
Connecting power supply wiring
4.
Ground wire (Yellow/Green)
5.
Terminal block (X1M)
6.
Transmission wiring
7.
(To X2M [TO IN/ D UNIT] (F1, F2))
8.
Terminal block (X2M)
9.
Insulation tube (Large) (accessory)
10.
Insulation tube (Small) (accessory)
11.
Cut off the insulation tube sticking out of the outdoor unit.
6-4 Transmission wiring connection procedure
• Between indoor units in the same system, pass the wiring between
the units as shown in figure 19. (There is no polarity.)
(Refer to figure 19)
1.
Terminal block (X2M)
2.
Use balance type shield wire (with no polarity).
3.
Indoor unit
4.
Under no circumstances should 208/230V be connected.
Precautions regarding the length of wiring between units
Exceeding the following limits may cause transmission malfunctions, so
observe them.
Max. wiring length
Max. 984ft.
Total wiring length
Max. 1968ft.
Max. no. of branches 8
Precautions regarding wiring between units
•
Do not connect 208/230V power wiring to terminals for the
transmission wiring. Doing so would destroy the entire system.
• Wiring to the indoor unit should be wired to F1 and F2 (TO IN/D unit)
on the outdoor unit’s terminal block (X2M).
NOTE
•
The above wiring should be wired using AWG 18-16 shielded (bal-
ance type) wiring.
(See figure 18 for how to ground the shielded parts.)
•
All transmission wiring is to be procured on site.
CAUTION
Up to 8 branches are available in the wiring among units.
Branch after branch cannot perform wiring between units.
(Refer to figure 20)
1.
Branch
2.
Branches after branch points
3.
Caution on branches in the wiring among units
7.
PRECAUTIONS ON REFRIGERANT PIPING
CAUTION
To the pipe-layer
• Do not operate the unit with the transport clasp attached. This can
cause abnormal shaking or noise. See “
5. PRECAUTIONS ON
INSTALLATION
” and “How to remove the transport clasp”.
7-1 Installation tools
Use the right parts to ensure tolerance and to prevent foreign matter for
entering.
Gauge manifold, charge hose, etc.
• Make sure to use installation tools that are exclusively used for
R410A installations to withstand the pressure and to prevent for-
eign materials (e.g. mineral oils such as SUNISO and moisture)
from mixing into the system.
(The screw specifications differ for R410A.)
Tightening torque (ft·lbf)
M5
Power terminal
1.76~2.15
M4
Shield ground
0.87~1.06
M3
Transmission wiring terminal block
0.58~0.72
Model name
Frequency
Voltage
Rated cur-
rent for fuses
Maximum
outdoor unit
operating
current
RXYMQ36PVJU
~60Hz
208/230V
30A
27.0A
RXYMQ48PVJU
~60Hz
208/230V
30A
27.0A
Insulating sleeve
Round crimp-style
terminal
Electric Wire
Connect wires
of the same gauge
to both side.
Do not connect
wires of different
gauges.
Do not connect
wires of the same
gauge to one side.
01_EN_3PN07193-6F.fm Page 7 Tuesday, September 1, 2009 4:13 PM
