7
Bring condenser end of unit into alignment with the curb
rst. 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.
Remove spreader bars, lifting cables and other
rigging equipment.
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 ttings. 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.
Main power wiring should be sized for the minimum circuit
ampacity shown on the unit’s dataplate. 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.
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