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2.6 IMPORTANCE OF PROPER INDOOR/OUTDOOR MATCH-UPS
To assure many years of reliable operation and optimum customer comfort and to assure
the outdoor unit warranty remains valid, an air-handler model should be selected that is
properly matched to the outdoor unit. This is especially critical for heat pump systems to
assure proper refrigerant charge balance between the cooling and heating modes. The
recommended approach is to select an air-handler model that has an AHRI match with
the outdoor unit. Refer to the AHRI directory at www.ahridirectory.org to confirm the
air-handler and outdoor unit are a certified combination in the AHRI Directory.
2.7 IMPORTANCE OF QUALITY INSTALLATION
A quality installation is critical to assure safety, reliability, comfort, and customer satis-
faction. Strict adherence to applicable codes, the information in this installation manual,
the outdoor unit installation manual, and the thermostat installation manual are key to a
quality installation. Read the entire instruction manuals before starting the installation.
IMPORTANT: This product has been designed and manufactured to meet certified
AHRI capacity and efficiency ratings with the appropriate outdoor units. However, prop-
er refrigerant charge, proper airflow, and refrigerant line sizing are critical to achieve
optimum capacity and efficiency and to assure reliable operation.
product should follow the manufacturer's refrigerant charging and airflow instructions
located in the outdoor unit installation instructions and the charging chart label affixed to
the outdoor unit. Failure to confirm proper charge and airflow may reduce energy effi-
ciency and shorten equipment life.
The equipment has been evaluated in accordance with the Code of Federal
Regulations, Chapter XX, Part 3280.
Install the unit in accordance with applicable national, state, and local codes. Latest edi-
tions are available from: "National Fire Protection Association, Inc., Batterymarch Park,
Quincy, MA 02269." These publications are:
• ANSI/NFPA No. 70-(Latest Edition) National Electrical Code.
• NFPA90A Installation of Air Conditioning and Ventilating Systems.
• NFPA90B Installation of warm air heating and air conditioning systems.
Install the unit in such a way as to allow necessary access to the coil/filter rack and
blower/control compartment.
3.0 INSTALLATION
3.1 TOOLS & REFRIGERANT
3.1.1 TOOLS REQUIRED FOR INSTALLING AND SERVICING R-410A MODELS
Manifold Sets:
• Up to 800 PSIG High-Side
• Up to 250 PSIG Low-Side
• 550 PSIG Low-Side Retard
Manifold Hoses:
• Service Pressure Rating of
800 PSIG
NOTICE
!
R-410A systems operate
at higher pressures than
R-22 systems. Do not
use R-22 service equip-
ment or components on
R-410A equipment.
Recovery Cylinders:
• 400 PSIG Pressure Rating
• Dept. of Transportation
4BA400 or BW400
3.1.2 SPECIFICATIONS OF R-410A
Application: R-410A is not a drop-in replacement for R-22. Equipment designs must
accommodate its higher pressures. It cannot be retrofitted into R-22 heat pumps.
Physical Properties: R-410A has an atmospheric boiling point of -62.9°F [-52.7°C] and
its saturation pressure at 77°F [25°C] is 224.5 psig.
Composition: R-410A is a near-azeotropic mixture of 50% by weight difluoromethane
(HFC-32) and 50% by weight pentafluoroethane (HFC-125).
Ambient and Tube
Thermometers
Manifold
Gauge
Set
Brazing
Recovery
Rods
Cylinders
Torch
Reclaimer
Installation of this
Crescent Wrench
Allen Wrench
Nitrogen
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