Specifications

3
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.
Suct Li
q
Suct Li
q
Suct Li
q
7 1/2 1 3/8 5/8 1 3/8 5/8 1 3/8 5/8
10 1 3/8 5/81 5/8 5/81 5/8 5/8
Cond Unit
(Tons)
REFRIGERANT LINE LENGTH (ft)
0-24 25-49* 50-74**
Line Diameter (In. OD)
* Full rating line size
** These sizes are suitable for line lengths of 74 feet or less.
For lines greater than 74 feet in length or vertical elevation
changes more than 50 feet,
contact your distributor for
assistance.
Mounting the condensing unit above
the evaporator coil will require an oil trap
in the suction line. Install one oil trap at
the evaporator, for a height difference of
more than 15 feet between indoor and
outdoor units.
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 compat-
ible with the type of refrigerant being used; otherwise, the in-
door coil must be replaced. To facilitate oil return to the com-
pressor, a horizontal suction line should be pitched (1/2” per
10’ toward the condensing unit.
Filter Drier and Sight Glass
A liquid line filter drier is factory installed. Field-install the sup-
plied sight glass/moisture indicator on the liquid line as close
as practical to the service valve.
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 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, de-
burred, 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 2 lbs. of R-410A 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 continu-
ally 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.
NOTE: Before brazing, verify indoor piston size by checking
the piston kit chart packaged with indoor unit.
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.
WARNING