Carrier 40MUAA Installation Instructions Manual

40MUAA
Residential Air Handler System
Sizes 18K to 60K
Fig. 1 -Air Handler
NOTE: Read the entire instruction manual before starting the
installation.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBERS AND ACCESSORIES . . . . . . . . . . . . . . . . . . 2
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 - Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 2 - Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 3 - Mount Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 4 - Installing Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 5 - Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 6 - Refrigerant Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Step 7 - Filter Drier (Heat Pump Drier ONLY) . . . . . . . . . . . . . . . . 14
Step 8 - Evacuate Coil and Tubing System . . . . . . . . . . . . . . . . . . . 15
Step 9 - Mount Electric Heater (Optional) . . . . . . . . . . . . . . . . . . . . 16
INDOOR UNIT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
WIRING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
AUXILIARY CONTACTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TEST RUN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SYSTEM CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
START-UP PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
ELECTRIC AUXILIARY HEATING WIRING DIAGRAMS . . . 29
24V CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . 31
Scan to access French documentation:
Installation Instructions
A220687
PAGE
Specifications subject to change without notice.

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 the literature and attached to the unit. Consult the 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 C22.2 No. 60335-2-40. Recognize safety information.
This is the safety-alert symbol
unit and in instruction manuals, be of 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.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death. Before installing or servicing the 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 the
switch with a suitable warning label.
CAUTION
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.
. When you see this symbol on the