GSX Installation Manual 2019

3
Do NOT let refrigerant lines come in direct contact with plumbing,
ductwork, floor joists, wall studs, floors, and walls. When running
refrigerant lines through a foundation or wall, openings should
allow for sound and vibration absorbing material to be placed or
installed between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be filled with a
pliable silicon-based caulk, RTV or a vibration damping material.
Avoid suspending refrigerant tubing from joists and studs with
rigid wire or straps that would come in contact with the tubing.
Use an insulated or suspension type hanger. Keep both lines
separate and always insulate the suction line.
These sizes are recommended for line lengths of 79 feet or
less to obtain optimum performance. For alternate line sizing
options or runs of more than 79 feet, refer to TP-107 R-410A
Long Line Set Application Guidelines or contact your distributor
for assistance.
Cond
Unit
Tons Suct Liq Suct Liq Suct Liq
1 1/2 5/8 1/4 3/4 3/8 3/4 3/8
2 5/8 1/4 3/4 3/8 3/4 3/8
2 1/2 5/8 1/4 3/4 3/8 7/8 3/8
3 3/4 3/8 7/8 3/8 1 1/8 3/8
3 1/2 7/8 3/8 1 1/8 3/8 1 1/8 3/8
4 7/8 3/8 1 1/8 3/8 1 1/8 3/8
5 7/8 3/8 1 1/8 3/8 1 1/8 3/8
Line Diameter (In. OD)
RECOMMENDED INTERCONNECTING TUBING (Ft)
0-24 25-49 50-79*
* Lines greater than 79 f eet in length or v ertical elev ation changes more than
50 f eet refer to TP-107 R-410A Long Line Set Application Guidelines or
contact your distributor for assistance.
Insulation is necessary to prevent condensation from forming
and dropping from the suction line. Armflex (or satisfactory
equivalent) with 3/8” min. wall thickness is recommended. In
severe conditions (hot, high humidity areas) 1/2” insulation may
be required. Insulation must be installed in a manner which
protects tubing from damage and contamination.
Existing Line Sets
Where possible, drain as much residual compressor oil from
existing systems, lines, and traps; pay close attention to low
areas where oil may collect. Use of an approved flushing agent
is recommended followed by a nitrogen purge to remove any
remaining flushing agent from the lines or indoor coil.
Replacement of indoor coil is recommended.
NOTE: If using existing indoor coil and changing refrigerant
types, ensure the indoor coil and metering device are compatible
with the type of refrigerant being used. If new indoor coil is
required check spec sheet or AHRI for approved coil. If system
is being replaced due to compressor electrical failure, assume
acid is in system. Refer to Service Procedure S-115
Compressor Burnout in service manual for clean-up procedure.
Burying Refrigerant Lines
If burying refrigerant lines can not be avoided, use the following
checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines
in waterproof material (conduit or pipe) sealing the ends
where tubing enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab,
ensure lines are adequately protected and sealed.
Refrigerant Line Connections
IMPORTANT
To avoid overheating the service valve, TXV valve, or filter
drier while brazing, wrap the component with a wet rag, or
use a thermal heat trap compound. Be sure to follow the
manufacturer’s instruction when using the heat trap
compound. Note: Remove Schrader valves from service
valves before brazing tubes to the valves. Use a brazing
alloy of 2% minimum silver content. Do not use flux.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to
any tube can melt the tube. Service personnel must use
the appropriate heat level for the size of the tube being
brazed. Note: The use of a heat shield when brazing is
recommended to avoid burning the serial plate or the finish
on the unit.
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks or
dents. Any other condition increases the chance of a
refrigerant leak.