3
•FILTERS
• OUTDOOR-AIR INLET SCREENS
EnergyX Component Lubrication . . . . . . . . . . . . . . 94
EnergyX Wheel Drive Adjustment . . . . . . . . . . . . . . 94
EnergyX Wheel Air Seal Adjustment . . . . . . . . . . . . 94
Wheel and Segment Removal / Installation . . . . . . 94
Wheel Segment Removal / Installation . . . . . . . . . . 94
• WHOLE WHEEL REMOVAL / INSTALLATION (19
INCH WHEEL)
• WHOLE WHEEL REMOVAL/INSTALLATION (25-46
INCH WHEELS)
Outside Air and Exhaust Air Hood Removal . . . . . 96
• OUTSIDE AIR HOOD REMOVAL
• EXHAUST AIR HOOD REMOVAL
Outside Air Motorized Damper Removal . . . . . . . . 97
Outside Air and Exhaust Fan Replacement . . . . . . 97
• OUTSIDE AIR FAN REMOVAL
• EXHAUST FAN REMOVAL
APPENDIX A — LOCAL DISPLAY AND CCN
TABLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
APPENDIC B — CONTROL MODES WITH
HUMIDI-MIZER SYSTEM AND ECONOMIZER . . . . 120
APPENDIC C — VARIABLE FREQUENCY DRIVE
(VFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
APPENDIC D — ENERGYX
®
EXHAUST FAN
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
ENERGYX
®
UNIT START-UP CHECKLIST . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause 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 the kits or accessories
when installing.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol . When 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,
CAUTION, and NOTE. 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.
IMPORTANT: This literature covers 48/50HC 04-28
models with ComfortLink Software version 3.X.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
WARNING
UNIT DAMAGE HAZARD
Failure to follow this caution may cause equipment damage.
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out com-
ponents or to bypass or otherwise depart from recommend-
ed procedures. Any short-to-ground of the control board or
accompanying wiring may destroy the electronic modules
or electrical components.
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, safety glasses and
gloves when handling parts and servicing air conditioning
equipment.
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage, per-
sonal injury or loss of life.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
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