SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance flmctions,
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Installation must be in compliance with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information. This is the safety-alert symbol /_.
When you see this symbol on the unit and in instructions or manu-
als, be alert to the potential for personal iniury. Understand these
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 iniury
or death. WARNING signifies hazards which could result in per-
sonal iniury or death. CAUTION is used to identify unsafe practic-
es which may result in minor personal injury or product and prop-
erty damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
Always install furnace to operate within the intended temperature
rise range with a duct system which has an external static pressure
within the allowable range, as specified in "Indoor Airflow Adjust-
ments" section of these instructions. See furnace rating plate.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
iniury or death.
Before installing or servicing system, always turn off main
power to system and tag disconnect. There may be more
than one disconnect switch. Turn off accessory heater power
switch if applicable.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal
iniury or equipment damage.
Puron (R-410A) systems operate at higher pressures than
standard R-22 systems. DO NOT use R-22 service
equipment or components on Puron (R-410A) equipment.
Ensure service equipment is rated for Puron (R-410A).
INTRODUCTION
The 48XL packaged unit is a fully self-contained combination
Category I gas heating/electric air conditioner designed for outdoor
installation (See Fig. 1). Standard units are shipped in a
horizontal-discharge configuration for installation on a
ground-level slab or directly on the ground if local codes permit.
Standard units can be converted to downflow (vertical) discharge
configurations for rooftop applications.
Models with an N in the fifth position of the model number are
dedicated Low NOx units designed for California installations.
These models meet the California maximum oxides of nitrogen
(NOx) emissions requirements of 40 nanograms/joule or less as
shipped from the factory and must be installed in California Air
Quality Management Districts or any other regions in North
America where a Low NOx rule exists.
NOTE: Low NOx requirements apply only to natural gas
installations.
RECEIVING AND INSTALLATION
Check Equipment
IDENTIFY UNIT
The unit model number and serial number are printed on the unit
informative plate. Check this information against shipping papers.
INSPECT SHIPMENT
Inspect for shipping damage while unit is still on shipping pallet. If
unit appears to be damaged or is torn loose from its anchorage,
have it examined by transportation inspectors before removal.
Forward claim papers directly to transportation company.
Manufacturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the
nearest Carrier office if any item is missing. To prevent loss or
damage, leave all parts in original packages until installation.
Provide Unit Support
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate, if required.
ROOF CURB
Install accessory roof curt) in accordance with instructions shipped
with curt) (See Fig. 4). Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curt) is
critical for a water tight seal. Install gasketing material supplied
with the roof curt). Improperly applied gasketing also can result in
air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6.35 m) (See Fig. 2). This is
necessary for unit drain to function properly. Refer to accessory
roof curt) installation instructions for additional information as
required.
A-B
1/4 (6.35)
MAXIMUM ALLOWABLE
DIFFERENCE in. (ram)
B-C A-C
1/4 (6.35) 1/4 (6.35)
A07925
Fig. 2 - Unit Leveling Tolerances
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of 4
in. (102 mm) thick with 2 in. (51 mm) above grade. The slat)
should extend approximately 2 in. (51 mm) beyond the casing on
all 4 sides of the unit (See Fig. 3). Do not secure the unit to the slat)
except when required by local codes.
2" _
(50.Smm)
RETURr SUPPLY
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EVAR COIL COND. COIL
A07926
Fig. 3 - Slab Mounting Detail
GROUND MOUNT
The unit may be installed either on a slab or placed directly on the
ground if local codes permit. Place the unit on level ground
prepared with gravel for condensate discharge.
