Unitary Ducted Split AC
18
5.3.7 Make Electrical Connections
NOTE:
The signal line of the wired controller must be separated from the power line and the
connecting line between the indoor unit and the outdoor unit.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Do not supply power to unit with compressor termial box cover removed.
Be sure field wiring complies with local and national fire, safety, and electrical codes, and
voltage to system is within limits shown on unit rating plate. Contact local power company for
correction of improper voltage. See unit rating plate for recommended circuit protection device.
NOTE:
Operation of unit on improper line voltage constitutes abuse and could affect unit
reliability. See unit rating plate. Do not install system where voltage may fluctuate above or below
permissible limits.
NOTE:
Use copper wire only between disconnect switch and unit.
NOTE:
Install branch circuit disconnect of adequate size per NEC to handle unit starting
current. Locate disconnect within sight from and readily accessible from unit, per Section 440—14
of NEC.
WARNING:
A separate air switch must be furnished for the external power supply of the unit,
otherwise it would cause damage to the unit or bodily injury or even death.
Table 12
Model Number
Minimum Circuit
Ampacity-
MCA(amps)
Maximum
Over Current
Protective
device-
MOCP(amps)
Compressor
LRA/RLA
Capability of Air
Switch(A)
Minimum
Sectional Area Of
Earth Wire(mm2
(Outdoor/Indoor)
HW18024PNa-D
15
16.9
-/9.7
15
2.1
HW18036PNa-D
24
30.7
-/13.2
30
3.3
HW18042PNa-D
24
35.4
-/13.2
30
3.3
HW18048PNa-D
30
48.8
-/21.0
45
5.3
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires from disconnect through
power wiring hole provided and into unit control box.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if
an electrical fault should occur.
The ground may consist of electrical wire or metal conduit when installed in accordance with
existing electrical codes.
