Instruction manual

6
Electrical Requirements—Models With Factory-Installed Electric Heat
NOTES:
■ Use copper conductors only.
■ All field wiring must be done in accordance with National
Electrical Code, applicable requirements of UL and local
codes where applicable.
■ Electrical wiring, disconnect means and overcurrent
protection are to be supplied by the installer. Refer to the air
handler rating plate for maximum overcurrent protection,
minimum circuit ampacity, as well as operating voltage.
■ The power supply must be sized and protected according to
the specifications supplied on the product.
■ This air handler is factory-configured for 240-volt, single
phase, 60 cycles. For 208-volt applications, see “208-Volt
Conversion” in the “Make Electrical Connections—Models
Without Factory-Installed Electric Heat” section.
Ductwork Requirements
■ Install the conditioned air plenum, ducts and air filters (not
provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
■ The air handler is provided with flanges for the connection of
the plenum and ducts.
■ The air handler is equipped with flanges that can form a filter
rack for the installation of the air filter, or the filter may be
installed as part of the return air duct system.
■ Air filters must be listed as Class 2 furnace air filters.
■ Supply and return ductwork must be adequately sized to
meet the system’s air requirements and static pressure
capabilities. Ductwork should be insulated with a minimum of
1" thick insulation with a vapor barrier in conditioned areas or
2" minimum in unconditioned areas.
■ Supply plenum should be the same size as the flanged
opening provided around the blower outlet and should
extend ideally at least 3 ft from the air handler before turning
or branching off plenum into duct runs. The plenum forms an
extension of the blower housing and minimizes air expansion
losses from the blower.
INSTALLATION INSTRUCTIONS
Inspect Shipment
These air handlers are completely factory assembled, and all
components are performance tested. Each air handler consists of
a blower assembly, refrigerant coil, and controls, in an insulated
galvanized steel factory finished enclosure. Knockouts are
provided for electrical wiring entrance.
1. Check the air handler rating plate to confirm specifications
are as ordered.
2. Upon receipt of air handler, thoroughly inspect it for possible
shipping damage. Closely examine the air handler inside the
carton if the carton is damaged.
If damage is found, it should be noted on the carrier’s freight bill.
Damage claims should be filed with the carrier immediately.
Claims of shortages should be filed with the seller within 5 days.
WARNING
Electrical Shock Hazard
Electrically ground electric heater.
Connect ground wire to ground terminal
marked “GND.”
Use copper wire rated for supply connection.
Correct wire gauge is shown in the chart below.
Failure to follow these instructions can result in
death or electrical shock.
Rating Plate Ampacity
21 - 30
31 - 40
41 - 60
AWG
10
8
6
Excessive Weight Hazard
Use two or more people to move and install air handler.
WARNING
Failure to do so can result in back or other injury.