Carrier FB4CNP060L00 - User Manual

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FB4C

Installation Instructions

FAN COIL UNITS

FOR R--410A REFRIGERANT

SIZES 018 TO 061

NOTE: Read the entire instruction manual before starting the

installation.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS 1........................

INTRODUCTION 1..................................

HEATER PACKAGES 2..............................

INSTALLATION 2...................................

Step 1 — Check Equipment 2.........................

Step 2 — Mount Unit 2..............................

Step3—AirDucts 4...............................

Step 4 — Electrical Connections 4.....................

Step 5 — Refrigerant Tubing Connection and Evacuation 7..

Step 6 — Refrigerant Flow--Control Device 7.............

Step 7 — Condensate Drains 8........................

Step 8 — Accessories 9..............................

Step 9 — Sequence of Operation 9.....................

START--UP PROCEDURES 9..........................

CARE AND MAINTENANCE 9........................

AIRFLOW PERFORMANCE TABLES 10................

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,

or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, 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, protective clothing

and work gloves. Have a fire extinguisher available. Read these

instructions thoroughly and follow all warnings or cautions

included in literature and attached to the unit. Consult local

building codes and the current editions of the National Electrical

Code (NEC) NFPA 70.

In Canada, refer to the current editions of the Canadian Electrical

Code CSA C22.1.

Recognize safety information. This is the safety--alert symbol

When you see this symbol on the unit and in instruction manuals,

be alert 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 may 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.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury

or death.

Before installing or servicing unit, always turn off all power to

unit. There may be more than one disconnect switch. Turn off

accessory heater power if applicable. Lock out and tag switch

with a suitable warning label.

WARNING

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and

wear appropriate protective clothing and gloves when

handling parts.

CAUTION

INTRODUCTION

FB4C models are R--410A Fan Coils designed for installation

flexibility. These units are designed to meet the low air leak

requirements currently in effect.

FB4CNF(018--048) uses a refrigerant piston metering device. A

TXV is used on FB4CNP(018--061). All FB4C fan coils use a

multi--tap ECM motor for efficiency. These units have be designed

for upflow, downflow (kit required), and horizontal orientations,

including manufactured and mobile home applications.

These units require a field supplied air filter, and are designed

specifically for R--410A refrigerant air conditioners and heat

pumps as shipped. These units are available for systems of 18,000

through 60,000 BTUh nominal cooling capacity. Factory--

authorized, field -- installed electric heater packages are available in

sizes 5 through 30kW. See Product Data literature for all available

accessory kits.

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Summary

Safety Considerations

Electrical Operation Hazard

Warning regarding electrical hazards during unit installation or servicing.

Cut Hazard

Caution about sharp edges on sheet metal parts and protective measures.

Refrigerant Tubing Connection and Evacuation

Tubing Connection

Steps for connecting refrigerant tubing, including brazing and insulation.

Refrigerant Flow-Control Device

Condensate Drains

Condensate Line Connection

Guidance on connecting condensate lines and preventing drain pan overflow.

Condensate Traps

Requirements for installing properly sized condensate traps for drainage.

This document describes the FB4C Fan Coil Units, designed for R-410A refrigerant systems, with sizes ranging from 018 to 061. These units are engineered for installation flexibility and are designed to meet current low air leak requirements.

Function Description

The FB4C fan coil units serve as a crucial component in R-410A refrigerant air conditioning and heat pump systems. Their primary function is to facilitate heat exchange by circulating air over an evaporator coil, either for cooling or heating purposes, depending on the system's mode of operation. The units are equipped with a multi-tap ECM motor, which contributes to their efficiency by allowing for various airflow settings.

Specifically, FB4CNF models (018-048) utilize a refrigerant piston metering device, while FB4CNP models (018-061) employ a TXV (Thermostatic Expansion Valve) for refrigerant flow control. These metering devices are essential for regulating the flow of refrigerant into the evaporator coil, optimizing system performance and efficiency.

The units are designed for versatile installation in upflow, downflow (requiring a specific kit), and horizontal orientations, making them suitable for a wide range of applications, including manufactured and mobile home installations. They require a field-supplied air filter to protect the internal components from dust and debris, ensuring clean air delivery and prolonging the life of the unit.

Optional factory-authorized, field-installed electric heater packages are available in sizes from 5 to 30kW, allowing the fan coil to provide supplemental or primary heating when integrated into a heat pump system or used as a standalone electric furnace. The motor speeds and time delay functions are built into the motor, simplifying control and operation.

Usage Features

The FB4C fan coil units offer several features that enhance their usability and adaptability:

Installation Flexibility: The units can be installed in upflow, downflow, or horizontal configurations. For downflow applications, specific accessory kits (KFADC0201SLP for slope fan coils and KFADC0401ACL for A-coils) are required for proper condensate drainage conversion. A gasket kit (KFAHD0101SLP) is also necessary for downflow to maintain low air leak and low sweat performance. Horizontal installations require careful leveling to ensure optimum condensate drainage.
Modular Design: For installations in spaces with limited access, modular units can be disassembled and their components moved separately to the installation area for reassembly. This feature is particularly useful for small scuttle holes or restrictive entrances.
Refrigerant Flow Control: Depending on the model, units come with either a factory-installed piston with a Teflon ring (FB4CNF) or an R-410A refrigerant TXV (FB4CNP). If a piston replacement is needed, the correct size must be matched to the outdoor unit's specifications. When changing a piston, a back-up wrench is recommended, and care must be taken not to overtighten the hex nut. The indoor piston's Teflon ring must be properly seated for cooling operation.
Condensate Management: The units are equipped with primary and secondary 3/4-inch FPT drain connections. Both drain lines should be installed with properly-sized condensate traps to prevent property damage and ensure optimal drainage. Factory-approved traps are available, and PVC fittings are recommended. For installations in or above living spaces, a field-supplied external condensate pan and a secondary condensate line draining to a noticeable location are recommended to prevent water damage from overflow.
Electrical Connections: The low voltage circuit is protected by a 3-amp automotive type fuse. The units are designed for 208/230V power supply, and all electrical connections must comply with NEC and local codes. For units with electric heaters, specific wiring instructions apply, and a field-supplied disconnect switch is required.
Motor Speed Selection: The multi-tap ECM motor allows for various fan speeds, which can be selected at the motor connector. Different taps offer varying airflow rates and off-delay times. For electric heat operation, a specific tap (Tap 4) provides a 0-second off delay, while other taps (1, 2, 3) have a 90-second off delay. Tap 5 is for high static applications with a 0-second off delay.
Ductwork Integration: Supply-air ducts connect over 3/4-inch flanges, and flexible connectors are recommended to prevent vibration transmission. When an electric heater is installed, heat-resistant material should be used for the flexible connector at the discharge. Ductwork in unconditioned spaces must be insulated and vapor-barriered. Units with 20-30kW electric heaters require a 1-inch clearance to combustible materials for the first 36 inches of supply duct.
Acoustical Treatment: For metal duct systems without a 90-degree elbow and 10 feet of main duct to the first branch takeoff, internal acoustical insulation lining or fibrous ductwork (complying with NFPA 70 and UL Standard 181) may be necessary to reduce noise.
Humidifier Integration: The units can be connected to a humidifier and humidistat, with wiring diagrams provided for both heat pump and electric heat configurations. A cooling lockout relay is an optional feature for humidifier control.

Maintenance Features

To ensure continued high performance and minimize potential equipment failure, regular maintenance is essential for the FB4C fan coil units:

Filter Replacement/Cleaning: The most critical and frequently recommended consumer service is the monthly replacement or cleaning of the air filter. Operating the unit without a filter can lead to damage to the blower motor and coil. Factory-authorized filter kits should be used for internal filters, or a field-supplied filter must be installed in the return duct system if internal access is impractical.
Condensate Drain Maintenance: Regular inspection and cleaning of the condensate drain lines and traps are important to prevent blockages and overflows. The traps should be primed after connection and tested for leaks. Insulating traps in living areas is also recommended.
Refrigerant System Care: When servicing the refrigerant system, it is crucial to follow R-410A specific guidelines. This includes using appropriate tools (e.g., manifold sets rated for 700 psig high side and 180 psig low side, hoses rated for 700 psig), recovering refrigerant, evacuating the system to 500 microns, and replacing filter driers. Filter driers should not be left in line for more than 72 hours. A brazing shield must be used to prevent damage to unit surfaces and condensate pan fittings during brazing.
Electrical System Checks: Periodic checks of all factory wiring and connections are recommended to ensure they are secure and free from damage. If a different control package is installed, its specific wiring diagram should be consulted.
General Inspection: A qualified installer or service agency should perform periodic maintenance, including a general inspection of the unit for any signs of wear, damage, or loose components. This includes checking for proper sealing around duct connections and condensate pan fittings to maintain low air leak performance.
Professional Servicing: The ability to properly perform maintenance on this equipment requires specific mechanical skills and tools. If these are not possessed, users should contact their local dealer for maintenance services. A maintenance contract with a qualified professional is recommended to ensure regular, comprehensive servicing.
Safety Precautions: Always turn off all power to the unit before installing or servicing. Lock out and tag switches with suitable warning labels. Wear safety glasses, protective clothing, and gloves when handling parts, as sheet metal can have sharp edges. Have a fire extinguisher available during installation and service.

Carrier FB4CNP060L00 Specifications

General

Model	FB4CNP060L00
Category	Air Conditioner
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Depth	21 inches
Cooling Capacity	60, 000 BTU/h
Heating Capacity	60000 BTU/h
Airflow	1600 CFM