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FMA5L, FMA5X
Multifamily Wall-Hung Fan Coil, for R-454B Refrigerant
NOTE: Read the entire instruction manual before starting the
installation.
Table of Contents
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Check Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mount Fan Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 1 - Dimensional Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Conversion to Bottom Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Select Proper Blower Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Leak Dissipation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Leak Dissipation System Self-Test . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 - Control Board Test Functions . . . . . . . . . . . . . . . . . . . . 11
Table 3 - Required Minimum Dissipation Mode Airflows,
based on Total System Refrigerant Charge Quantity. . . . . . . . . . . 11
Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4 - FMA5X ECM Motor Speed Taps Delay Off Time
Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Continuous Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Heat Pump Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Heat Pump Heating with Auxiliary Electric Heat . . . . . . . . . . . . . 11
Electric Heat or Emergency Heat Mode . . . . . . . . . . . . . . . . . . . . 12
Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5 - Filter Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Refrigerant Charge and Room Area Limitations . . . . . . . . . . . . . . 12
Table 6 - Minimum Opening Area for Connected Rooms. . . . . . 13
Table 7 - Maximum Refrigerant Charge . . . . . . . . . . . . . . . . . . . 13
Table 8 - Required Minimum Room Area . . . . . . . . . . . . . . . . . . 13
Table 9 - Minimum Circulation Airflow . . . . . . . . . . . . . . . . . . . 13
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10 - PSC -Airflow Performance (Standard CFM). . . . . . . . 22
Table 11 - ECM - Airflow Performance (Standard CFM) . . . . . . 22
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 individual instructions packaged with kits or accessories when
installing.
Installation Instructions
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have a fire
extinguisher available. Read these instructions thoroughly and follow all
warning 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 Canadian Electrical Code CSA
C22.1.
Recognize safety information. This is the safety alert symbol
you see this symbol on the unit and in instructions or 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.
Introduction
FMA5L, FMA5X Fan Coils are designed with application flexibility in
mind and are suitable for closet and flush mount installations. These
units can be equipped with either factory-installed or field-installed
electric heat options, with the latter including a circuit breaker. Units are
used indoors as the fan coil for split-system heat pumps or air
conditioners.
The FMA5L uses a TXV and a 3 Speed PSC Motor. FMA5X uses a
TXV and a 5 speed multi-tap ECM motor for efficiency. Units are
available in 18,000 through 36,000 Btuh nominal cooling capacities.
Field-installed heaters are available in 5, 7.5, and 10 kW sizes. The coil
is equipped with sweat-type connections and is vapor-charged with dry
nitrogen. The casing is fully insulated to meet applications in
conditioned space. Additional insulation is required if the unit is
installed in unconditioned space.
NOTE: Nuisance sweating may occur if the unit is installed in a humid
location with low airflow.
Units are designed for upflow applications only. Local codes may limit
this free-air-return type unit to installation in single-level applications.
IMPORTANT: These units are designed specifically for R-454B
refrigerant and must be used only with compatible R-454B refrigerant
air conditioners and heat pumps as shipped.
. When
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Table of Contents
Related Manuals for Carrier FMA5X
Summarization of Contents
Installation Instructions and Safety Guidelines
Safety Considerations for Installation
General safety precautions and warnings to prevent injury and property damage during installation.
Introduction to Fan Coil Units
Overview of FMA5L/FMA5X fan coil unit features, applications, and refrigerant compatibility.
Installation Overview
General guidelines and steps for installing the fan coil unit.
General Safety Warnings and Hazards
Property and Personal Injury Hazards
Warnings regarding refrigerant, combustible materials, and general hazards during installation and operation.
Environmental and Operational Hazards
Cautions on unit placement, ventilation, and avoiding ignition sources for safe operation.
Flammable Refrigerant Safety Practices
Safe Handling of Flammable Refrigerants
Precautions for working with flammable refrigerants, including safety checks and proper procedures.
Electrical Safety and Grounding
Guidelines for safely handling electrical components, ensuring proper grounding, and checking continuity.
Refrigerant System Procedures
Refrigerant Recovery and System Preparation
Detailed steps for safely recovering refrigerant, purging systems, and preparing for maintenance.
Unit Installation Procedures
Check Equipment Upon Arrival
Procedure for unpacking, inspecting, and verifying the unit against job specifications.
Installation Site and Clearances
Requirements for installation location, clearances, and handling sharp metal parts.
Fan Coil Mounting Options
Wall Mount Installation
Instructions for mounting the fan coil unit using the provided wall bracket.
Frame Mount Installation
Instructions for mounting the fan coil unit within a frame structure.
Unit Specifications and Connections
Dimensional Data and Connections
Provides physical dimensions, weight, and connection types for different fan coil models.
Ductwork Installation Guidelines
Ductwork Specifications and Requirements
Standards for connecting supply-air ducts, insulation, vapor barriers, and return air.
Return Ductwork Safety Warning
Warning against connecting return ductwork to other heat-producing devices.
Unit Configuration and Connections
Condensate Drain Setup
Details on primary and secondary condensate drain connections, trap installation, and pitching.
Electrical Connections
Instructions for making low-voltage and line-voltage electrical connections, including wire gauge and grounding.
System Operation and Leak Detection
Select Proper Blower Speed
Procedure for setting fan speeds using DIP switches on the control board.
Leak Dissipation System
Information on the factory-wired R-454B leak detection and dissipation system.
Leak Dissipation System Self-Test
How to perform a self-test on the leak detection system and interpret LED status.
Sequence of Operation and Airflow
Sequence of Operation
Description of unit operation in different modes: continuous fan, cooling, heat pump, and auxiliary heat.
Required Minimum Dissipation Airflows
Table outlining minimum required airflow rates for dissipation mode based on refrigerant charge.
Maintenance and Refrigerant Limits
Care and Maintenance
Routine maintenance tasks for the fan coil unit, including filter replacement and cleaning.
Refrigerant Charge and Room Area Limitations
Guidelines for refrigerant charge limits based on room size and A2L classification.
Room Area Calculations and Wiring
Room Area Calculation Requirements
Detailed requirements for calculating room area to determine compliance with refrigerant charge limits.
Electrical Wiring Standards
Compliance with National Electric Code (NEC) and local ordinances for field wiring.
Wiring and Ductwork Standards
Control Wiring Guidelines
Best practices for running low-voltage control wiring, separation from power wiring, and wire gauge.
Power Wiring and Grounding
Requirements for power wiring connections, branch circuit disconnects, and permanent grounding.
Ductwork Installation Standards
Adherence to NFPA standards for ductwork, insulation, and connection to the unit.
Wiring Diagrams Overview
Air Conditioning Unit Wiring
Wiring diagram for cooling and single-stage heat configurations.
Heat Pump Unit Wiring
Wiring diagram for heat pump cooling and two-stage heat configurations.
ECM Motor Wiring Diagram
FMA5X ECM Schematic
Detailed wiring diagram for the FMA5X ECM motor, including speed taps and factory installed electric heat.
PSC Motor Wiring Diagram
FMA5L PSC Schematic
Detailed wiring diagram for the FMA5L PSC motor, including speed taps and factory installed electric heat.
PSC Motor Field Installed Electric Heat Wiring
FMA5L PSC Field Wiring
Wiring diagram for FMA5L PSC motor with field installed electric heat.
ECM Motor Field Installed Electric Heat Wiring
FMA5X ECM Field Wiring
Wiring diagram for FMA5X ECM motor with field installed electric heat.
Field Installed Electric Heat Wiring
Electric Heat Kit Schematic
Schematic diagram for the electric heat kit connections, including components and notes.
Factory Installed Electric Heat Wiring
5kW Electric Heat Wiring
Wiring diagram for the 5kW factory installed electric heat kit.
7.5kW & 10kW Electric Heat Wiring
Wiring diagrams for the 7.5kW and 10kW factory installed electric heat kits.
Airflow Performance Data
PSC Motor Airflow Performance
Table showing airflow performance data for PSC motors across various static pressures and speeds.
ECM Motor Airflow Performance
Table showing airflow performance data for ECM motors across various static pressures and speeds.
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