En-4
2-2. CONNECTING WIRES FOR OUTDOOR UNIT
• Be sure to use special circuits for room air conditioner.
• Wiring work should be based on applicable technical standards.
• Wiring connections should be made following the diagram.
• Screws should be tightened so they won’t loosen.
ELECTRICAL SPECIFICATIONS
OUTDOOR UNIT
NTXMMX20A122A
✱
Power supply
(V, PHASE, Hz)
208/230, 1, 60
Max. Fuse size
(time delay) (A)
20
Min. Circuit
Ampacity (A)
17.2
Fan motor
(F.L.A)
1.77
Com-
pressor
(R.L.A)
10.7
(L.R.A)
15.5
Control voltage
Indoor unit-Remote controller : (Wireless)
Indoor unit-Outdoor unit : DC 12-24 V
1-3/8 in.
(35 mm)
5/8 in.
(15 mm)
Lead wire
1) Remove the service panel.
2) Remove the conduit plate.
3) Attach the conduit connector to conduit plate with lock nut then secure
it to the unit with screws. Be sure to attach the conduit connectors in
the correct locations according to their sizes.
4) Connect ground wires to the TB bed.
5) Loosen terminal screw, and connect indoor/outdoor unit connecting
wire (B) from the indoor unit correctly on the terminal block. Be careful
not to make mis-wiring. Fix the wire to the terminal block securely so
that no part of its core is appeared, and no external force is conveyed
to the connecting section of the terminal block.
6) Firmly tighten the terminal screws to prevent them from loosening. After
tightening, pull the wires lightly to confirm that they do not move.
7) Perform 5) and 6) for each indoor unit.
8) Connect power supply cord (A).
9) Close the service panel securely. Make sure that 3-2. PIPE CONNEC
-
TION is completed.
CONNECTING WIRES AND CONNECTING GROUND WIRE
• Use solid conductor Min. AWG14 or stranded conductor Min. AWG14.
• Use double insulated copper wire with 600 V insulation.
• Use copper conductors only.
*
Follow local electrical code.
POWER SUPPLY CABLE
• Use solid or stranded conductor Min. AWG8.
• Use copper conductors only.
*
Follow local electrical code.
GROUND WIRE
• Use solid or stranded conductor Min. AWG8.
• Use copper conductors only.
*
Follow local electrical code.
WARNING:
• Use the indoor/outdoor unit connecting wire that meets the Stand-
ards to connect the indoor and outdoor units and fix the wire to
the terminal block securely so that no external force is conveyed
to the connecting section of the terminal block. An incomplete
connection or fixing of the wire could result in a fire.
Remark:
* Use a ring tongue terminal in order to connect a ground wire to terminal.
• Connect wires to the matching numbers of terminals.
• Be sure to attach each screw to its correspondent terminal when
securing the cord and/or the wire to the terminal block.
Terminal block
Grounding
terminal *
208/230 V AC
1 phase 60 Hz
Grounding
terminal *
Terminal block
Ground
OUTDOOR UNIT
Power supply
208/230 V AC
1 phase 2 wires 60 Hz
Disconnect
switch
Grounding
terminal *
Terminal block
Terminal block
Terminal block
For future servicing, give extra length to the connecting wires.
Conduit connector
Trade size of conduit
(a) Power supply
3/4 in.
(b) Indoor/outdoor
1/2 in.
INDOOR UNIT
Note:
• Removing the handle increases the effectiveness of the wiring operation.
• Be sure to reinstall the handle.
• Turn on the main power when the ambient temperature is -4°F
(-20°C) or higher.
• Under conditions of -4°F (-20°C), it needs at least 4hr stand by
before the units operate in order to warm the electrical parts.
Service panel
Screws
Lock nut
Conduit connector
Conduit plate
Screw
VG79A939H01_01En.indd 4
2018/08/03 15:53:02