Carrier FB4B, FC4C, FA4B, FH4B Instruction Manual

Fan Coil Units

FA4B, FB4B, FC4C
FH4B

NOTE: Read the entire instruction manual before starting the installation.
This symbol → indicates a change since the last issue.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may
cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance.
The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions
packaged with kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and National Electrical Code
(NEC) for special requirements.

Recognize safety information. This is the safety-alert symbol
the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices which wouldresult inminorpersonalinjuryorproductandpropertydamage.NOTE
is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

. When you see this symbol on the unit and in instructions manuals, be alert to

WARNING: Before installing or servicing unit, always turn off all power to unit. There may be more than 1 disconnect

switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.

INTRODUCTION

Models FA4B, FB4B, FC4C, and FH4B are designed for flexibility and can be used for upflow, horizontal, or downflow (kit required and
manufactured and mobile home) applications. These units are designed to meet the low air leak requirements currently in effect. Because of this,
the units need special attention in the condensate pan and drain connection area and when brazing tubing. These units are available for systems
of 18,000 through 60,000 Btuh nominal cooling capacity. Factory authorized electric heater packages are available in sizes 3 through 30kw. See
Product Data Literature for available accessory kits.

HEATER PACKAGES

This unit may or may not be equipped with an electric heater package. For units not equipped with factory installed heat, a factory approved, field
installed UL listed heater package is available from your equipment supplier. See unit rating plate for a list of factory approved heaters. Heaters
that are not factory approved could cause damage which would not be covered under the equipment warranty. If fan coil contains a factory installed
heater package, minimum circuit ampacity (MCA) and maximum fuse/breaker may be different than units with a same size field installed accessory
heater. The difference is not an error and is due to calculation difference per UL guidelines.

INSTALLATION

PROCEDURE 1—CHECK EQUIPMENT

Unpack unit and move to final location. Remove carton taking care not to damage unit.
Inspect equipment for damage prior to installation. File claim with shipping company if shipment is damaged or incomplete. Locate unit rating

plate which contains proper installation information. Check rating plate to be sure unit matches job specifications.

PROCEDURE 2—MOUNT UNIT

Unit can stand or lie on floor, or hang from ceiling or wall. Allow space for wiring, piping, and servicing unit.
IMPORTANT: When unit is installed over a finished ceiling and/or living area, building codes may require a field-supplied secondary condensate

pan to be installed under the entire unit. Some localities may allow as an alternative, the running of a separate, secondary condensate line. Consult
local codes for additional restrictions or precautions.

A. Upflow Installation

If return air is to be ducted through a floor, set unit on floor over opening and use 1/8- to 1/4-in. thick fireproof resilient gasket between duct,
unit, and floor.

Side return is a field option on slope coil models. Cut opening per dimensions. (See Fig. 1.) A field-supplied bottom closure is required.

Form: IM-FA4B-02 Cancels: IM-FA4B-01 Printed in U.S.A. 6-03 Catalog No. 63FA-4B1

POWER ENTRY

OPTIONS

FIELD SUPPLIED
SUPPLY DUCT

LOW VOLT
ENTRY
OPTIONS

018-060
070 24-IN.

UPFLOW/DOWNFLOW

SECONDARY DRAIN

UPFLOW/DOWNFLOW

PRIMARY DRAIN

B. Downflow Installation

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 19 In.

1

1

⁄2″

19″

1

2

⁄2″

A
12 In.
17 In.

FIELD MODIFIED
SIDE RETURN

A

LOCATION FOR
SLOPE COIL
UNITS ONLY

FIELD SUPPLIED
RETURN PLENUM

A00069

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.
—2—

A-COIL

HORIZONTAL LEFT

PRIMARY
DRAIN

LOW VOLT
ENTRY
OPTIONS

POWER
ENTRY OPTIONS

FIELD
SUPPLIED
HANGING
STRAPS

UNIT

SECONDARY
DRAIN

PRIMARY
DRAIN

SECONDARY
DRAIN

018-060 21-IN.
070 24-IN.
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)

1 3/4 IN.
FILTER ACCESS
CLEARANCE

Fig. 2—Slope Coil Unit in Horizontal Left Application

4. Lay fan coil unit on its right side and reinstall coil assembly with condensate pan down. (See Fig. 4.)

5. Attach coil to casing flange using coil mounting screw previously removed.

6. Make sure the pan cap in the fitting door is properly seated on the fitting door to retain the low air leak rating of the unit.

7. Add gaskets from kit KFAHD per kit instructions.

8. Align holes with tubing connections and condensate pan connections, and reinstall access panels and fitting panel.

Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating. Install after brazing.

HORIZONTAL RIGHT CONVERSION OF UNITS WITH A-COILS

1. Remove blower and coil access panels. (See Fig. 5.)

2. Remove metal clip securing fitting panel to condensate pan. Remove fitting panel.

3. Remove 2 snap-in clips securing A-coil in unit.

4. Slide coil and pan assembly out of unit.

5. Remove horizontal drain pan support bracket from coil support rail on left side of unit and reinstall on coil support rail on right side of unit.

6. Convert air-seal assembly for horizontal right.
a. Remove air-seal assembly from coil by removing 4 screws. (See Fig. 5.)
b. Remove air splitter (B) from coil seal assembly by removing 3 screws. (See Fig. 5—factory shipped inset.)
c. Remove filter plate (A) and install air splitter (B) in place of filter plate.
d. Install filter plate (A) as shown in horizontal right application.
e. Remove condensate troughs (C) and install on opposite tube sheets.
f. Install hose onto plastic spout.

7. Install horizontal pan on right side of coil assembly.

8. Slide coil assembly into casing. Be sure coil bracket on each corner of vertical pan engages coil support rails.

9. Reinstall 2 snap-in clips to correctly position and secure coil assembly in unit. Be sure clip with large offsets is used on right side of unit
to secure horizontal pan.

A00070

—3—

BLOWER BOX

2 SCREWS

2 SCREWS

REAR CORNER
BRACKET

2 SCREWS

COIL BOX

Fig. 3—Removal of Brackets on Modular Units

A95293

COIL MOUNTING
SCREW

BLOWER
ASSEMBLY

COIL

SUPPORT

RAIL

SLOPE COIL

SKI

DRAINPAN

REFRIGERANT

PRIMARY DRAIN

CONNECTIONS

SECONDARY DRAIN

A03001

Fig. 4—Conversion for Horizontal Right Applications Using a Slope Coil

10. Remove two oval fitting caps from left side of the coil, access panel, and fitting panel.

11. Remove insulation knockouts on right side of coil access panel

12. Remove 2 oval coil access panel plugs and reinstall into holes on left side of coil access panel and fitting panel.

13. Install condensate pan fitting caps (from Step 10) in the right side of the coil door making sure that the cap snaps and seats cleanly on the
back side of the coil door. Make sure no insulation interferes with seating of the cap.

—4—

A

AIR SEAL
ASSEMBLY

B
C

HORIZONTAL

RIGHT

APPLICATION

A00071

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

Fig. 5—Conversion for Horizontal Right Applications Using A-Coil

14. Reinstall access and fitting panels, aligning holes with tubing connections and condensate pan connections. Be sure to reinstall metal clip
between fitting panel and vertical condensate pan.

Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating.

D. Manufactured and Mobile Home Housing Applications

1. Fan coil unit must be secured to the structure using field-supplied hardware.

2. Allow a minimum of 24” clearance from access panels.

3. Recommended method of securing for typical applications
a. If fan coil is away from wall, attach pipe strap to top of fan coil using No. 10 self tapping screws. Angle strap down and away from back

of fan coil, remove all slack, and fasten to wall stud of structure using 5/16-in. lag screws. Typical both sides of fan coil.

b. If fan coil is against wall, secure fan coil to wall stud using 1/8-in. thick right-angle brackets. Attach brackets to fan coil using No. 10

self tapping screws and to wall stud using 5/16-in. lag screws. (See Fig. 7.)

PROCEDURE 3—AIR DUCTS

Connect supply-air duct over the outside of 3/4-in. flanges provided on supply-air opening. Secure duct to flange, using proper fasteners for type
of duct used, and seal duct-to-unit joint. If return-air flanges are required, install factory-authorized accessory kit.

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.

Units equipped with 20-30kw electric heaters require a 1-in. clearance to combustible materials for the first 36 in. of supply duct.

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 as tested by
UL Standard 181 for Class 1 air ducts.

PROCEDURE 4—ELECTRICAL CONNECTIONS

All products from the factory utilize a printed-circuit board (PCB) which has a low voltage circuit protective fuse (5 amp), fan motor speed tap
selection terminal (SPT), and time delay relay (TDR) jumper. To disable the TDR feature, sever the jumper wire JW1. (See Fig. 8.)

When a factory-approved accessory control package has been installed, check all factory wiring per unit wiring diagram and inspect factory wiring
connections to be sure none were loosened in transit or installation. If a different control package is required, see unit rating plate.

CAUTION: If a disconnect switch is to be mounted on unit, select a location where drill or fastener will not contact

electrical or refrigerant components. Failure to follow this CAUTION could result in minor personal injury or porduct and
property damage.

—5—