6
When utilizing the existing air coil or line set, only flushing
compounds that vaporize should be used; which means they are
packaged in a pressurized disposable cylinder. It is preferable
to use a flushing agent that removes oil, water, and acid, plus, is
biodegradeable and non-toxic. The flushing agent should be safe to
use with both HCFC and HFC refrigerants. Once a flushing agent
has been selected, follow the instructions provided with the product.
The first step should be purging the lines or air coil with nitrogen.
Purging with nitrogen first will remove some of the particulate and
residual oil which will allow the flushing agent to work better. Never
blow the flushing agent through a compressor, filter drier, or txv as it
will cause the components to fail.
When flushing is complete and the final system is assembled, an
acid check should be preformed on the system. Acid test kits are
available from most HVACR distributors.
Connection to Air Coil
Typical Split System Application - Remote Blower Coil and
Typical Split System Heat Pump Coil Add-on Fossil Fuel Furnace
illustrations show typical Outdoor Split installations. The Line
Set Sizes table shows typical line set diameters and maximum
length. Line sets over 60 feet are not recommended. If the line set
is kinked or deformed and cannot be reformed, the bad section
of pipe should be replaced. A restricted line set will affect unit
performance. As in all R-410A equipment, a reversible liquid line
filter drier is required to ensure all moisture is removed from the
system. This drier should be replaced whenever “breaking into”
the system for service. All line sets should be insulated with a
minimum of 1/2” closed cell insulation. All exterior insulation
should be painted with UV resistant paint or covering to ensure
long insulation life.
Air Handler Installation
Air handlers used with dual capacity units must be capable
of operating with a minimum of 2 blower speeds. Refer to the
manufacturer’s instructions for the blower coil unit for details on
installing the air handling portion of the system. All blower coil
units/air coils must be installed as specified by the manufacturer’s
installations instructions. However, the following recommendations
should be considered to minimize noise and service problems.
An air filter must always be installed upstream of the air coil on
the return air side of the air handler or furnace. If there is limited
access to the filter rack for normal maintenance, it is suggested
that a return air filter grille be installed. Be sure that the return duct
is properly installed and free of leaks to prevent dirt and debris
from bypassing the filter and plugging the air coil.
Ensure that the line set size is appropriate to the capacity of the
unit (refer to Line Set Sizes table). Line sets should be routed as
directly as possible, avoiding unnecessary bends or turns. All wall
penetrations should be sealed properly. Line set should not come
into direct contact with water pipes, floor joists, wall studs, duct
work, floors, walls and brick. Line set should not be suspended
from joists or studs with a rigid wire or strap which comes into
Typical Split System Application -
Remote Blower Coil
direct contact with the tubing. Wide hanger strips which conform to
the shape of the tubing are recommended. Isolate hanger straps
from line set insulation by using metal sleeves bent to conform to
the shape of insulation. Line set insulation should be pliable, and
should completely surround the refrigerant line.
NOTE:
Improper installation of equipment may result in
undesirable noise levels in the living areas.
General Installation Information cont.
Lineset
To Air Handler
Insulated
Suction Line
Return
Duct
Low
Voltage Wire
Disconnect
Remote Air Handler
(Maximum Recommended Distance is
60' Between Units)
Condensate Drain
(must be trapped)
Supply
Duct
Air
Handler
AFFINITY DUAL-CAPACITY OUTDOOR SPLIT SERIES INSTALLATION MANUAL
