Carrier 48EZ(N) - A Installation Instructions Manual Download

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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 per-

sonal injury 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.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Before installing or servicing system, always turn off main

power to system and install lockout tag. There may be

more than one disconnect switch. Turn off accessory heater

power switch if applicable.

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK AND

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal

injury, death or property damage.
A qualified installer or agency must use only

factory--authorized kits or accessories when modifying this

product.

WARNING

CUT HAZARD

Failure to follow this caution may result in personal injury.
When removing access panels (see Fig. 19) or performing

maintenance functions inside your unit, be aware of sharp

sheet metal parts and screws. Although special care is taken

to reduce sharp edges to a minimum, be extremely careful

when handling parts or reaching into the unit.

CAUTION

INTRODUCTION

The 48EZ--A unit (see Fig. 1) is a fully self--contained,
combination Category I gas heating/electric heating and cooling

unit designed for outdoor installation (See Fig. 2 and 3 for unit
dimensions). All unit sizes have return and discharge openings for

both horizontal and downflow configurations, and are factory

shipped with all downflow duct openings covered. Units may be
installed either on a rooftop, or on a cement slab (See Fig. 4 for

roof curb dimensions).
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.

RECEIVING AND INSTALLATION

Step 1 — Check Equipment

IDENTIFY UNIT
The unit model number and serial number are stamped on the unit

information plate. Check this information against shipping papers.
INSPECT SHIPMENT
Inspect for shipping damage before removing packaging materials.
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 equipment distribution office if any item is missing. To
prevent loss or damage, leave all parts in original packages until

installation.
If the unit is to be mounted on a curb in a downflow application,
review Step 9 to determine which method is to be used to remove

the downflow panels before rigging and lifting into place. The
panel removal process may require the unit to be on the ground.

Step 2 — Provide Unit Support

For hurricane tie downs, contact distributor for details and PE

(Professional Engineering) Certificate if required.
ROOF CURB
Install accessory roof curb in accordance with instructions shipped
with curb (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 curb is

critical for a water tight seal. Install gasketing material supplied
with the roof curb. Improperly applied gasketing also can result in
air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6 mm). This is necessary for

unit drain to function properly. Refer to accessory roof curb
installation instructions for additional information as required.

Installation on older “G” series roof curbs.

Two accessory kits are available to aid in installing a new “G”

series unit on an old “G” roof curb.

1. Accessory kit number CPADCURB001A00, (small chassis)

and accessory kit number CPADCURB002A00, (large
chassis) includes roof curb adapter and gaskets for the
perimeter seal and duct openings. No additional

modifications to the curb are required when using this kit.

2. An alternative to the adapter curb is to modify the existing

curb by removing the outer horizontal flange and use
accessory kit number CPGSKTKIT001A00 which includes

spacer blocks (for easy alignment to existing curb) and
gaskets for the perimeter seal and duct openings. This kit is
used when existing curb is modified by removing outer

horizontal flange.

UNIT/STRUCTURAL DAMAGE HAZARD

Failure to follow this caution may result in property damage.
Ensure there is sufficient clearance for saw blade when cutting

the outer horizontal flange of the roof curb so there is no

damage to the roof or flashing.

CAUTION

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 slab

should be flush on the compressor end of the unit (to allow
condensate drain installation) and should extend 2 in. (51 mm) on

the three remaining sides of the unit. Do not secure the unit to the
slab

except

when required by local codes.