Safety Considerations - Carrier 50XZ024 Installation, Start-Up And Service Instructions Manual

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters. All other operations should be performed
by trained service personnel. When working on air-conditioning
equipment, observe precautions in the literature, tags, and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause explosion, fire, electric shock, or
other occurrences, which could cause serious injury or death
or damage your property. Consult a qualified installer or
service agency for information or assistance. The qualified
installer or agency must use only factory-authorized kits or
accessories when modifying this product.
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the product or in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words — DANGER, WARNING, CAU-
TION, and NOTE. Danger identifies the most serious hazards,
which will result in severe personal injury or death. Warning
indicates a condition that could cause serious personal injury or
death. Caution is used to identify unsafe practices, which would
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.
1. The power supply (volts, phase, and hertz) must correspond to
that specified on unit rating plate.
2. The electrical supply provided by the utility must be sufficient
to handle load imposed by this unit.
3. This installation must conform with local building codes and
with NEC (National Electrical Code). Refer to provincial and
local plumbing or waste water codes and other applicable local
codes.
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory heater
power switch if applicable. Electrical shock could cause
severe injury or death.
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 50XZ heat pump is fully self-contained and designed for
outdoor installation. (See Fig. 1) Standard units are shipped in a
horizontal-discharge configuration for installation on a ground-
level slab. Standard units can be converted to downflow (vertical)
discharge configurations for rooftop applications.
RECEIVING AND INSTALLATION
Step 1—Check Equipment
IDENTIFY UNIT
The unit model number and serial number are stamped on the unit
identification plate. Check this information against shipping pa-
pers.
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. Manu-
facturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the
nearest Carrier Air Conditioning office if any item is missing. To
prevent loss or damage, leave all parts in original packages until
installation.
Step 2—Provide Unit Support
ROOF CURB
Install accessory roof curb in accordance with instructions shipped
with curb (See Fig. 5). 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 watertight 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. (See Fig. 6). This is
necessary for unit drain to function properly. Refer to accessory
roof curb installation instructions for additional information as
required.
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of
4 in. thick with 2 in. above grade (See Fig. 7). The slab should
extend approximately 2 in. beyond the casing on all 4 sides of the
unit. Do not secure the unit to the slab except when required by
local codes.
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.
Step 3—Provide Clearances
The required minimum service clearances are shown in Figs. 2 and
3. Adequate ventilation and outdoor air must be provided. The
outdoor fan draws air through the outdoor coil and discharges it
through the top fan grill. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a
corner or under an overhead obstruction. The minimum clearance
under a partial overhang (such as a normal house overhang) is 48
in. above the unit top. The maximum horizontal extension of a
partial overhang must not exceed 48 in.
IMPORTANT: Do not restrict outdoor airflow. An air restriction
at either the outdoor-air inlet or the fan discharge may be
detrimental to compressor life.
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting or other combustible materials. Slab-mounted units
should be at least 4 in. above the highest expected water and runoff
levels. Do not use unit if it has been under water.
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