Trane 2GN Series Installer's Manual page 7

Utilizing Existing Coil or Air Handler
It is recommended that a new R-410A air handler be
installed with a 2GN Series Split considering the long term
benefi ts of reliability, warranty, etc. versus the short term
installation cost savings.
Connection to Air Coil
Figures 1 and 2 illustrate typical 2GN Series Split installations.
Reference the Line Set Sizes table for typical line set
diameters and maximum length. Line sets over 60 feet are
not recommended. Longer line sets will signifi cantly reduce
capacity and effi ciency of the system as well as adversely
effect the system reliability due to poor oil return. 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 fi lter 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.
18-GL07D1-4
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 specifi ed
by the manufacturer's installations instructions. However, the
following recommendations should be considered to minimize
noise and service problems.
An air fi lter 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 fi lter rack for normal maintenance, it is
suggested that a return air fi lter grille be installed. Be sure
that the return duct is properly installed and free of leaks to
prevent dirt and debris from bypassing the fi lter 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, fl oor
joists, wall studs, duct work, fl oors, walls and brick. Line set
should not be suspended from joists or studs with a rigid wire
or strap which comes into 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.
Notes: Improper installation of equipment may result in
undesirable noise levels in the living areas.
2GN SPLIT INSTALLER'S GUIDE
7