Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating.
F. Downflow Installations
To convert units for downflow applications, refer to Installation Instructions supplied with kit for proper installation. For FK4C unit sizes 001 and
003, use kit Part No. KFADC0201SLP. For FK4C unit sizes 002, 005, and 006 use kit Part No. KFADC0401ACL. Use fireproof resilient gasket,
1/8- to 1/4-in. thick, between duct, unit, and floor.
PROCEDURE 3—AIR DUCTS
Connect supply-air duct over outside of 3/4-in. flange provided on supply-air opening. Secure duct to flange with proper fasteners for type of duct
used, and tape duct-to-unit joint.
Duct connection flanges are provided on unit air discharge connection.
When using FK4C units with 20-, 24-, and 30-kw electric heaters, maintain a 1-in. clearance from combustible materials to discharge plenum and
ductwork for a distance of 36 in. from unit. Use accessory downflow base to maintain proper clearance on downflow installations.
Use flexible connectors between ductwork and unit to prevent transmission of vibration. When electric heater is installed, use heat resistant material
for flexible connector between ductwork and unit at discharge connection. Ductwork passing through unconditioned space must be insulated and
covered with vapor barrier.
A. Ductwork Acoustical Treatment
Metal duct systems that do not have a 90° elbow and 10 ft of main duct to first branch takeoff may require internal acoustical insulation lining.
As an alternative, fibrous ductwork may be used if constructed and installed in accordance with the latest edition of SMACNA construction
standard on fibrous glass ducts. Both acoustical lining and fibrous ductwork shall comply with National Fire Protection Association Standards 90A
or B as tested by UL Standard 181 for Class 1 air ducts.
PROCEDURE 4—ELECTRICAL CONNECTIONS
A. Line-Voltage Connections
Units with 15- and 20-kw heaters are factory wired for dual-circuit operation. When single-circuit operation is required, 24- and 30-kw heaters
are field convertible, and 15- and 20-kw fused heaters require the use of factory-authorized adapter kit.
Check all factory wiring per unit wiring diagram and inspect factory wiring connections to be sure none were loosened in transit or installation.
WARNING: Before installing or servicing system, always turn off all power to system. There may be more than 1
disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.
CAUTION: If a disconnect switch is to be mounted on the unit, select a location where drill or fastener will not contact
electrical or refrigerant components. Electrical shock can cause personal injury or death.
NOTE: Before proceeding with electrical connections, make certain that supply voltage, frequency, and phase are as specified on unit rating plate.
Be sure that electrical service provided by the utility is sufficient to handle the additional load imposed by this equipment.
See unit wiring label for proper field high- and low-voltage wiring. Make all electrical connections in accordance with NEC and any local codes
or ordinances that may apply. Use copper wire only. The unit must have a separate branch electric circuit with a field-supplied disconnect switch
located within sight from, and readily accessible from the unit.
Fig. 8—A-Coil in Horizontal Right-Application
A95286
COIL
SUPPORT
RAIL
COIL
BRACKET
DRAIN PAN
SUPPORT
BRACKET
COIL
SUPPORT
RAIL
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIMARY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
REFRIGERANT
CONNECTIONS
AIR SEAL
ASSEMBLY
A
B
C
A
B
C
FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION
HORIZONTAL
RIGHT
APPLICATION
PRIMARY DRAIN
HORIZONTAL LEFT
SECONDARY DRAIN
HORIZONTAL LEFT
—7—
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