Introduction; Safety Considerations - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual
Indoor and weathertight outdoor air handlers
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Motor Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Motor and Drive Package Data . . . . . . . . . . . . . . . 255
Variable Frequency Drive . . . . . . . . . . . . . . . . . . . . 255
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 256
Steam Coil Performance Problems . . . . . . . . . . . . 256
Steam Failure Modes . . . . . . . . . . . . . . . . . . . . . . . 257
VFD Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
START-UP CHECKLIST -
39MN AHU UNITS. . . . . . . . . . . . . . . . . . . . . . . . CL-1
START-UP CHECKLIST -
39MW AHU UNITS . . . . . . . . . . . . . . . . . . . . . . . CL-3
START-UP CHECKLIST -
39M GAS-FIRED DUCT FURNACE . . . . . . . . . . CL-5
START-UP CHECKLIST -
INTRODUCTION
The 39M Series central station air handlers are usually installed
with ductwork; they provide air conditioning at nominal capacities
of 1500 to 55,000 cfm. The 39M air handler design allows hun-
dreds of different configuration possibilities. Each unit is assem-
bled to meet specific job requirements and can be shipped in sec-
tions or as a single assembly. These instructions describe how to
install, start up, and service 39M air handlers.
SAFETY CONSIDERATIONS
The 39M air-handling equipment is designed to provide safe and
reliable service when installed and operated within design
specifications. To avoid injury to personnel and damage to
equipment or property when operating this equipment, use good
judgment and follow safe practices as outlined below.
NEVER enter an enclosed fan cabinet or reach into a unit
while the fan is running.
Failure to heed this warning will result in severe personal
injury or death.
WARNING
LOCK OPEN AND TAG the fan motor power disconnect
switch before working on a fan. Take fuses with you and note
removal on tag.
LOCK OPEN AND TAG the electric heat coil power
disconnect switch before working on or near heaters.
Failure to follow these safety precautions could lead to severe
personal injury or death.
DANGER
CHECK for adequate ventilation when welding, cutting, or
performing any other fume producing activities inside air-
handling unit cabinet or plenum so that fumes will not migrate
through ductwork to occupied spaces.
WHEN STEAM CLEANING COILS be sure that the area is
clear of personnel.
SECURE fan drive sheave with a rope or strap before working
on a fan to ensure that rotor cannot freewheel.
PREVENT unauthorized entry into the unit; leave safety
latches in place on access doors except during installation or
service procedures. After accessing a section, replace and
tighten the safety latch.
DO NOT work on dampers until their operators are
disconnected.
BE SURE that fans are properly grounded before working on
them.
Failure to follow these safety precautions could lead to
personal injury.
CHECK the assembly and component weights to be sure that
the rigging equipment can handle them safely. Note also the
centers of gravity and any specific rigging instructions.
PROTECT adjacent flammable material when welding or
flame cutting. Have a fire extinguisher at hand and ready for
immediate use.
Failure to follow these safety precautions could lead to severe
personal injury and/or equipment damage.
DO NOT remove access panel fasteners until fan is completely
stopped.
Pressure developed by a moving fan can cause excessive force
against the panel and toward personnel.
Failure to heed this warning could lead to personal injury and/
or equipment damage.
DO NOT ground equipment to fan assembly when welding.
Damage to fan bearings could result.
DO NOT restore power to unit until all temporary walkways
inside components have been removed.
NEVER pressurize equipment in excess of specified test
pressures.
Failure to follow these safety precautions could lead to
equipment damage.
3
WARNING
WARNING
WARNING
CAUTION
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