7
CAUTION
To prevent damage to the wiring, protect
wiring from sharp edges. follow national
electrical code and all local codes and
ordinances. Do not route wires through
removable access panels.
CAUTION
To prevent severe damage to the bottom of
the unit, do not fork lift unit after wood
struts have been removed.
Bring condenser end of unit into alignment with the curb
first. Lower unit carefully onto roof mounting curb. When a
rectangular cantilever curb is used, care should be taken to
center the unit. Check for proper alignment and orientation
of supply and return openings with duct.
Rigging Removal
CAUTION
To prevent damage to the unit, do not allow
crane hooks and spreader bars to rest on the
roof of the unit.
Remove spreader bars, lifting cables and other
rigging equipment.
ELECTRICAL WIRING
WARNING
HIGH VOLTAGE!
Disconnect all power before
servicing or installing this unit.
Multiple power sources may be
present. Failure to do so may cause
property damage, personal injury or
death.
WARNING
HIGH VOLTAGE!
To avoid personal injury or death
due to electrical shock, do not
tamper with factory wiring. The
internal power and control wiring
of these units are factory-installed
and have been thoroughly tested
prior to shipment. Contact your
local representative if assistance is
required.
CAUTION
Conduit and fittings must be weather-tight to
prevent water entry into the building.
For unit protection, use a fuse or
HACR
circuit breaker that
is in excess of the circuit ampacity, but less than or equal
to the maximum overcurrent protection device. DO NOT
EXCEED THE MAXIMUM OVERCURRENT DEVICE SIZE
SHOWN ON UNIT DATA PLATE.
All line voltage connections must be made through
weatherproof fittings. All exterior power supply and ground
wiring must be in approved weatherproof conduit.
The main power supply wiring to the unit and low voltage
wiring to accessory controls must be done in accordance
with these instructions, the latest edition of the National
Electrical Code (ANSI/NFPA 70), and all local codes and
ordinances.
The unit is factory wired for the voltage shown on the unit’s
data plate. Refer to model nomenclature in Appendix B for
voltage requirement for your unit.
NOTE: If supply voltage is 208V, lead on primary
of transformer(s) must be moved from the 230V
to the 208V tap. Refer to wiring diagram on unit
for details.
Main power wiring should be sized for the minimum
circuit ampacity shown on the unit’s database. Size wires
in accordance with the ampacity tables in
Article 310 of
the National Electrical Code
. If long wires are required,
it may be necessary to increase the wire size to prevent
excessive voltage drop. Wires should be sized for a
maximum of 3% voltage drop.
CAUTION
To avoid risk of property damage, personal
injury or fire, use only copper conductors.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
NOTE: A weather-tight disconnect switch, properly
sized for the unit total load, must be field or factory
installed. An external field supplied disconnect may
be mounted on the exterior panel.
Ensure the data plate is not covered by the field-supplied
disconnect switch.
•
Some disconnect switches are not fused. Protect the
power leads at the point of distribution in accordance
with the unit data plate.
