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Direct Expansion Fan Coil Units
Fan Unit
NOTE: Read the entire instruction manual before starting the installation.
This symbol → indicates a change since the last issue.
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 the 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
to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. 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 would result in minor personal injury or product and property damage. NOTE is used
to highlight suggestions which will result in enhanced installation, reliability, or operation.
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.
Models FA4A, FB4A, FC4B, and FH4A are designed for flexibility and can be used for upflow, horizontal, or downflow (kit required)
applications. These units are available for systems of 24,000 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.
This unit may or may not be equipped with an electric heater package. Some units have a factory supplied 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.
PROCEDURE 1—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.
B. Downflow Installation
In this application, field conversion of the evaporator coil is required, using accessory downflow kit, along with an accessory base kit. See
installation instructions packaged with accessory kits.
C. Horizontal Installation
Units must not be installed with access panels facing up or down. The FH4A003 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 Figs. 2 and 6.) When suspending unit
from ceiling, dimples in casing indicate suitable location of screws for mounting metal support straps. (See Fig. 2.)
Form: IM-FA4A-10
Installation Instructions
SAFETY CONSIDERATIONS
. When you see this symbol on the unit and in instructions or manuals, be alert
INTRODUCTION
→ HEATER PACKAGES
INSTALLATION
Cancels: IM-FA4A-09
Printed in U.S.A.
6-00
FA4A, FB4A, FC4B
Catalog No. 63FA-4A5
FH4A
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Summary of Contents for CAC / BDP FA4A
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Page 1: Installation Instructions
INTRODUCTION Models FA4A, FB4A, FC4B, and FH4A are designed for flexibility and can be used for upflow, horizontal, or downflow (kit required) applications. These units are available for systems of 24,000 through 60,000 Btuh nominal cooling capacity. Factory authorized electric heater packages are available in sizes 3 through 30kw. - Page 2 POWER ENTRY FIELD SUPPLIED OPTIONS SUPPLY DUCT LOW VOLT ENTRY OPTIONS 018-060 21-IN. FRONT SERVICE 070 24-IN. CLEARANCE UNIT 018/024 12 In. 030/036 17 In. A COIL 19 In. UNITS UPFLOW/DOWNFLOW SECONDARY DRAIN ⁄ ″ UPFLOW/DOWNFLOW 19″ PRIMARY DRAIN FIELD MODIFIED SIDE RETURN LOCATION FOR ⁄...
- Page 3 A-COIL HORIZONTAL LEFT PRIMARY SECONDARY DRAIN FIELD DRAIN SUPPLIED HANGING STRAPS 018-060 21-IN. 070 24-IN. FRONT SERVICE CLEARANCE UNIT (FULL FACE OF UNIT) LOW VOLT ENTRY OPTIONS 1 3 /4 IN. FILTER ACCESS CLEARANCE PRIMARY DRAIN SECONDARY DRAIN POWER ENTRY OPTIONS A00070 →...
- Page 4 COIL MOUNTING BLOWER SCREW ASSEMBLY COIL SUPPORT RAIL SLOPE COIL TXV SENSING BULB MUST BE DRAINPAN PRIMARY DRAIN REFRIGERANT INSULATED CONNECTIONS OVERFLOW HOLE SECONDARY DRAIN A99033 Fig. 4—Conversion for Horizontal Right Applications Using a Slope Coil REFRIGERANT AIR SEAL CONNECTIONS ASSEMBLY HORIZONTAL RIGHT...
- Page 5 COIL FACTORY SHIPPED BRACKET HORIZONTAL LEFT APPLICATION COIL SUPPORT RAIL DRAIN PAN SUPPORT BRACKET COIL BRACKET HORIZONTAL DRAIN PAN PRIMARY DRAIN HORIZONTAL LEFT AIR SEAL ASSEMBLY SECONDARY DRAIN HORIZONTAL LEFT REFRIGERANT CONNECTIONS A00072 → Fig. 6—A-Coil in Horizontal Left Application (Factory Ready) c.
- Page 6 FA4A units installed without electric heat require the use of a factory-authorized Power Plug Kit (KFAPP0125PLG). This kit provides the electrical connections necessary to supply the FA4A unit with 230-v power when electric heat is not present. This kit is required only on those FA4A applications which do not use electric heat.
- Page 7 FAN COIL FAN COIL THERMOSTAT THERMOSTAT (CONTROL) (CONTROL) AIR COND. AIR COND. A94058 A94059 Fig. 8—Wiring Layout Air Conditioning Unit Fig. 9—Wiring Layout Air Conditioning Unit (Cooling Only) (Cooling and 1-Stage Heat) FAN COIL FAN COIL HEAT PUMP HEAT PUMP THERMOSTAT THERMOSTAT (CONTROL)
- Page 8 FAN COIL HEAT PUMP THERMOSTAT (CONTROL) (CONTROL) ODTS1 ODTS2 EMERGENCY HEAT RELAY A94062 Fig. 12—Wiring Layout Heat Pump Unit (Cooling and 2-Stage Heat with 2 Outdoor Thermostats) SECONDARY PRIMARY A94067 Fig. 13—Transformer Connections C. Ground Connections → WARNING: According to NEC, ANSI/NFPA 70, and local codes, the cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur.
- Page 9 Fig. 14—Fan Coil Fan Relay and Speed Tap Terminal All units have 3 motor speed taps, except the FA4A 018 through 036. Low speed (red) is designed for mismatch outdoor unit applications. Medium speed (blue) is designed for straight matched operations. High speed (black) is used with high external static duct systems of straight matched systems.
- Page 10 TEFLON SEAL BRASS PISTON DISTRIBUTOR HEX NUT PISTON BRASS RETAINER HEX BODY STRAINER A94415 Fig. 15—Refrigerant Flow-Control Device (FC4B Has TXV and Strainer) NOTE: When connecting condensate drain lines, avoid blocking filter access panel, preventing filter removal. Prime both primary and secondary condensate traps after connecting to drain pan.
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Page 11: Care And Maintenance
Refer to outdoor unit Installation Instructions for system start-up instructions and refrigerant charging method details. CAUTION: Never operate unit without a filter. Damage to blower motor or coil may result. FA4A units are not shipped with filters. Factory authorized filter kits must be used when locating the filter inside the unit. For those applications where access to an internal filter is impractical, a field-supplied filter must be installed in the return duct system. - Page 12 FAN COIL HEAT PUMP THERMOSTAT (CONTROL) (CONTROL) FAN COIL THERMOSTAT (CONTROL) AIR COND. FAN HUMIDIFIER RELAY 115V HUMIDISTAT FAN HUMIDIFIER HUMIDISTAT 115V A95295 Fig. 21—Wiring Layout of Humidifier to Fan Coil with A95294 Fig. 20—Wiring Layout of Humidifier to Heat Pump Electric Heat SPDT 24VAC COIL...