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2.0 GENERAL INFORMATION
2.1 Introduction
The (-)A18AZ/(-)P18AZ series heat pumps are
specifically designed to operate with matching
communicating EcoNet™ enabled air-handlers, gas
furnaces, and Control Center. A conventional 24VAC
2-stage thermostat can be used, but many features
and benefits are lost, so this is only recommended for
emergency situations when there are issues with the
EcoNet™ communications and the system must be
made operational until the communication issues are
resolved.
This installation instruction manual contains complete
instructions for installation and setup using the
EcoNet™ or conventional 24VAC controls. Please refer
to the manufacturer's specification sheets for complete
performance data, thermostat, and accessory listings.
The information contained in this manual has been
prepared to assist in the proper installation, operation,
and maintenance of the air conditioning system.
Read this manual and any instructions packaged with
separate equipment required to make up the system
prior to installation. Homeowner should retain this
manual for future reference.
2.2 Agency Performance Audit
Testing Notice
For purposes of verifying or testing efficiency
ratings, the test procedure in Title 10 APPENDIX M
to Subpart B of Part 430 (Uniform Test Method for
Measuring the Energy Consumption of Central Air
Conditioners and Heat Pumps) and the clarifying
provisions provided in the AHRI Operations
Manual 210/240 that were applicable at the date of
manufacture should be used for test set up and
performance.
Should this unit be selected for performance audit
testing, follow the instructions included in the Appendix
(Section 12.1) of this manual.
2.3 Importance of Quality
Installation
A quality installation is critical to assure safety, reliability, comfort,
and customer satisfaction. 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, proper refrigerant charge,
proper airflow, and refrigerant line sizing are critical to achieve
optimum capacity and efficiency and to assure reliable operation.
Installation of this product should follow the manufacturer’s
refrigerant charging and airflow instructions located in this
installation manual and the charging chart label affixed to the
outdoor unit. Failure to confirm proper charge and airflow may
reduce energy efficiency 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 editions 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.
2.4 System Sizing and Selection
Before specifying any heat pump equipment, a
survey of the structure and heat loss and heat gain
calculations must be made. A heat loss calculation
involves identifying all surfaces and openings that
lose heat to the surrounding air in the heating mode
and quantifying that heat loss. A heat gain calculation
makes similar measurements and determines the
amount of heat required to be removed in the cooling
mode. A heat gain calculation also calculates the extra
heat load caused by sunlight and by humidity removal.
These factors must be considered before selecting
a heat pump system to provide year-round comfort.
The Air Conditioning Contractors of America (ACCA)
Manual J method of load calculation is one recognized
procedure for determining the heating and cooling
load.
After the proper equipment combination has
been selected, satisfying both sensible and latent
requirements, the system must be properly installed.
Only then can the system provide the comfort it was
designed to provide.
There are several factors that installers must consider.
• Outdoor unit location
• Indoor unit blower speed and airflow
• Proper equipment evacuation
• Supply and return air duct design and sizing
• Refrigerant charge
• System air balancing
• Diffuser and return air grille location and sizing
IMPORTANT: Excessive use of elbows in the
refrigerant line set can produce excessive pressure
General Information
WARNING:
Improper installation, or installation not made in
accordance with these instructions, can result in
unsatisfactory operation and/or dangerous conditions and
can cause the related warranty not to apply.
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