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Minihelic Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Fan Shaft Bearing Removal . . . . . . . . . . . . . . . . . . 226
Fan and Shaft Removal . . . . . . . . . . . . . . . . . . . . . 262
Motor Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Motor and Drive Package Data . . . . . . . . . . . . . . . 263
Variable Frequency Drive . . . . . . . . . . . . . . . . . . . . 263
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 265
Steam Coil Performance Problems . . . . . . . . . . . . 265
Steam Failure Modes . . . . . . . . . . . . . . . . . . . . . . . 265
VFD Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
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 specifi-
cations. 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.
DANGER
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 discon-
nect switch before working on or near heaters.
Failure to follow these safety precautions could lead to severe
personal injury or death.
CHECK for adequate ventilation when welding, cutting, or
performing any other fume producing activities inside air-han-
dling 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 latch-
es 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 discon-
nected.
BE SURE that fans are properly grounded before working on
them.
Failure to follow these safety precautions could lead to person-
al 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.
3
WARNING
WARNING
WARNING
WARNING
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