Carrier FMU5X Installation Instructions Manual

FMU5X, FMU5Z
MULTIFAMILY CEILING MOUNT FAN COIL
NOTE: Read the entire instruction manual before starting the installation.

Table of Contents

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Refrigerant Charge and Room Area Limitations . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Check Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mount Fan Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Supply-Air Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
RETURN AIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LEAK DISSIPATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Leak Dissipation System Self-Test . . . . . . . . . . . . . . . . . . . . . . . . 8
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Continuous Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heat Pump Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heat Pump Heating With Auxiliary Electric Heat. . . . . . . . . . . . . 9
Electric Heat Or Emergency Heat Mode . . . . . . . . . . . . . . . . . . . . 9
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 individual instructions packaged with kits or accessories when
installing.
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.
Installation Instructions
. When

INTRODUCTION

FMU5X and FMU5Z Fan Coils are designed for horizontal orientation
and are suitable for ceiling installations in conditioned spaces. These
units are available with field -installed electric heat, and are used indoors
as the fan coil for split -system heat pumps or air conditioners. FMU5X
and FMU5Z models all
available in 18,000 through 36,000 Btuh nominal cooling capacities.
FMU5X units utilize a 3-speed PSC motor. FMU5Z units utilize a
5-speed ECM motor.
Field-installed heaters are available in 3, 5, 6, 7.5 and 10 kW sizes. The
coil is equipped with sweat-type connections and is vapor-charged with
dry nitrogen.
Units are designed for horizontal applications only. Local codes may
limit this free-air-return type unit to installation in single-level
applications.
NOTE: Nuisance sweating may occur if the unit is installed in a humid
location with low airflow.
WARNING
!
PROPERTY OR PERSONAL
INJURY HAZARD
Risk of fire. Flammable refrigerant
used.
To be repaired only by trained service personnel. Do
not puncture refrigerant tubing.
Auxiliary devices which may be ignition sources shall not be installed
in the ductwork, other than auxiliary devices listed for use with the
specific appliance. See instructions.
Dispose of refrigerant properly in accordance with federal or local
regulations.
Failure to follow proper R-454B dissipation system installation
instructions can result in property damage, personal injury, or death. If
any fault codes are listed, please troubleshoot to prevent system
malfunction.
WARNING
!
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 the 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.
have a factory-installed TXV and are