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tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the suction line.
REFRIGERANT LINE LENGTH (ft)
Cond Unit
0-24
(Tons)
Suct
7 1/2
1 1/8
10
1 3/8
* Full rating line size
** Lines greater than 74 feet in length or vertical elevation changes more
than 50 feet refer to TP-108* Long Line Set Application Guideline or
contact your local distributor for assistance.
Refrigerant Lines
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.
Where possible, drain as much residual compressor oil
from existing systems, lines, and traps; pay close attention
to low areas where oil may collect.
NOTE: If changing refrigerant types, ensure the indoor
coil and metering device is compatible with the type of
refrigerant being used; otherwise, the indoor coil must
be replaced. To facilitate oil return to the compressor, a
horizontal suction line should be pitched (1/2" per 10' toward
the condensing unit).
25-49*
50-74**
Line Diameter (In. OD)
Liq
Suct
Liq
Suct
5/8
1 3/8
5/8
1 3/8
5/8
1 5/8
5/8
1 5/8
Filter Drier and Sight Glass
A liquid line filter drier is factory installed. Field-install the
supplied sight glass/moisture indicator on the liquid line as
close as practical to the service valve.
Burying Refrigerant Lines
Liq
If burying refrigerant lines can not be avoided, use the
5/8
following checklist.
5/8
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 as
recommended by the compound manufacturer. Use a
brazing alloy of 2% minimum silver content. Do not use flux.
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.
2. This unit is factory shipped with a holding charge.
"Sweep" the refrigerant line with nitrogen or inert gas
during brazing to prevent the formation of copper-
oxide inside the refrigerant lines.
3. After brazing, quench the joints with water or a wet
cloth to prevent overheating of the service valve.
4. Ensure the filter drier paint finish is intact after
brazing. If the paint of the steel filter drier has
been burned or chipped, repaint or treat with a rust
preventative. This is especially important on suction
line filter driers which are continually wet when the
unit is operating.
NOTE: Be careful not to kink or dent refrigerant lines.
Kinked or dented lines will cause poor performance or
compressor damage.
Do NOT make final refrigerant line connection until plugs
are removed from refrigerant tubing
LEAK TESTING
(NITROGEN OR NITROGEN-TRACED)
To avoid the risk of fire or explosion, never use oxygen
high pressure air or flammable gases for leak testing of a
refrigeration system.
4
WARNING
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