7
CAUTION
• Drain piping connections
Do not connect the drain piping directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might enter
the indoor unit through the drain pipes and corrode the heat
exchanger.
• Keep in mind that it will become the cause of getting drain
pipe blocked if water collects on drain pipe.
8. ELECTRIC WIRING WORK
8-1
GENERAL INSTRUCTIONS
• All field supplied parts and materials, electric works must
conform to local codes.
• Use copper wire only.
• Follow the “WIRING DIAGRAM” attached to the unit to wire
the outdoor unit, indoor units and the remote controllers.
For details on hooking up the remote controller, refer to the
“INSTALLATION MANUAL OF REMOTE CONTROLLER.”
• All wiring must be performed by an authorized electrician.
• This system consists of multiple indoor units. Mark each
indoor unit as unit A, unit B . . . , and be sure the terminal block
wiring to the outdoor unit and BS unit is properly matched. If
wiring and piping between the outdoor unit and indoor unit are
mismatched, the system may cause a malfunction.
• A circuit breaker capable of shutting down the power supply
to the entire system must be installed.
• Be sure to ground the air conditioner.
• Do not connect the ground wire to gas pipes, water pipes,
lightning rods, or telephone ground wires.
• Gas pipes: might cause explosions or fire if gas leaks.
• Water pipes: no grounding effect if hard vinyl piping is
used.
• Lightning rods or telephone ground wires: might cause
abnormally high electric potential in the ground during
lightning.
8-2
ELECTRICAL CHARACTERISTICS
MCA: Min. Circuit Amps (A); MFA: Max. Fuse Amps (A)
W: Fan Motor Rated Output (W); FLA: Full Load Amps (A)
8-3
SPECIFICATIONS FOR FIELD SUPPLIED
FUSES AND WIRE
NOTE
1.
Allowable length of transmission wiring between indoor /
outdoor units and between the indoor unit and the remote
controller is as follows.
(1) Outdoor unit – Indoor unit:
Max. 3280 ft. (Total wiring length: 6560 ft.)
(2) Indoor unit – Remote controller:
Max. 1640 ft.
2.
Insulated thickness: 1/16” or more.
9. WIRING EXAMPLE AND HOW TO SET
THE REMOTE CONTROLLER
9-1
HOW TO CONNECT WIRINGS
• Remove the electric parts box lid and connect the wirings.
NOTE
• For wiring to the electric parts box, also see “Wiring Diagram”
label on the back of the electric parts box lid.
• Do not confuse remote controller wiring and transmission
wiring when connecting to the terminal block.
• Fasten the wiring with accessory clamp (6).
• If mounting a remote con-
troller on the unit, wire as
shown in the figure on the
right.
Units
Power
supply
Fan motor
Model
Hz Volts
Voltage
range
MCA MFA
W
FLA
FXLQ12MVJU,
FXNQ12MVJU
60
208-
230
Max. 253
Min. 187
0.5
15
25
0.4
FXLQ18 · 24MVJU,
FXNQ18 · 24MVJU
0.6
15
35
0.5
Model
Power supply wiring
Remote controller wiring
Transmission wiring
Field
fuses
Size
Wire
Size
FXLQ12 · 18 ·
24 MVJU
15A
Size must com-
ply with local
codes.
Sheathed
wire
(2 wire)
AWG
18-16
FXNQ12 · 18 ·
24 MVJU
