Downflow Installation; Horizontal Installation; Slope Coil Unit In Upflow Application - Carrier FB4B Instruction Manual

018-060
070 24-IN.
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
B. Downflow Installation
CAUTION: The conversion of the fan coil to downflow requires special procedures for the condensate drains on both
A-coil and Slope units. The vertical drains have an overflow hole between the primary and secondary drain holes. This hole
is plugged for all applications except downflow, but must be used for downflow. During the conversion process, remove the
plastic cap covering the vertical drains only and discard. Remove the plug from the overflow hole and discard. At completion
of the downflow installation, caulk around the vertical pan fitting to door joint to retain the low air leak performance of the
unit. Failure to follow this CAUTION could result in minor personal injury or product and property damage.
In this application, field conversion of the evaporator is required using accessory downflow kit along with an accessory base kit. Use fireproof
resilient gasket, 1/8- to 1/4-in. thick, between duct, unit, and floor.
NOTE: To convert units for downflow applications, refer to Installation Instructions supplied with kit for proper installation. For slope fan coils,
use kit Part No. KFADC0201SLP. For A-coils, use kit Part No. KFADC0401ACL. Use fireproof resilient gasket, 1/8- to 1/4-in. thick, between
duct, unit, and floor.
NOTE: Gasket kit number KFAHD0101SLP is also required for all downflow applications to maintain low air leak/low sweat performance.
C. Horizontal Installation
Units must not be installed with access panels facing up or down. The FH4B003 and 004 size units equipped with accessory cooling coils are not
approved for horizontal applications. All other units are factory built for horizontal left installation. (See Fig. 2 and 6.) When suspending unit from
ceiling, dimples in casing indicate suitable location of screws for mounting metal support straps. (See Fig. 2.)
CAUTION: For optimum condensate drainage performance in horizontal installations, unit should be leveled along its
length and width. Failure to follow this CAUTION could result in minor personal injury or product and property damage.
NOTE: Modular units can be disassembled and components moved separately to installation area for reassembly. This process accommodates
small scuttle holes and limiting entrances to installation sites. (See Fig. 3.)
HORIZONTAL RIGHT CONVERSION OF UNITS WITH SLOPE COILS
NOTE: Gasket kit number KFAHD0101SLP is required for horizontal slope coil conversion to maintain low air leak/low sweat performance.
1. Remove blower and coil access panel and fitting panel. (See Fig. 4.)
2. Remove coil mounting screw securing coil assembly to right side casing flange.
3. Remove coil assembly.
POWER ENTRY
OPTIONS
21-IN. FRONT SERVICE
CLEARANCE
A COIL
UNITS
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
Fig. 1—Slope Coil Unit in Upflow Application
UNIT
018/024
030/036
042
⁄ "
1
1
2
19 "
⁄ "
1
2
2
—2—
FIELD SUPPLIED
SUPPLY DUCT
LOW VOLT
ENTRY
OPTIONS
A
12 In.
17 In.
19 In.
FIELD MODIFIED
SIDE RETURN
A
LOCATION FOR
SLOPE COIL
UNITS ONLY
FIELD SUPPLIED
RETURN PLENUM
A00069