Carrier FMA5L Installation Instructions Manual

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