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48 | APPLICATION GUIDELINES
Single Zone Extended Piping Wall Mounted Engineering Manual
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Planning for Snow and Ice, continued.
CAUTION
When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on
sidewalks or driveways, which will create unsafe conditions. Properly install and insulate any drain hoses to prevent the hose from freezing, cracking,
leaking, and causing unsafe conditions from frozen condensate.
PLACEMENT CONSIDERATIONS
Outdoor Unit
Tie-Downs and Lightning Protection
Tie-Downs
• The strength of the roof must be checked before installing the
outdoor units.
• If the installation site is prone to high winds or earthquakes, when
installing on the wall or roof, securely anchor the mounting base
using a field-provided tie-down configuration approved by a local
professional engineer.
• The overall tie-down configuration must be approved by a local
professional engineer.
Always refer to local code when using a wind restraint system.
Lightning Protection
• To protect the outdoor unit from lightning, it must be placed within
the specified lightning safety zone.
• Power cable and communication cable must be installed five (5) feet away from lightning rod.
• A high-resistance ground system must be included to protect against induced lightning or indirect strike.
Building Height (feet)
66 98 148 197
3URWHFWLRQ$QJOHÛ
55 45 35 25
Figure 27: Typical Arrangement of Single Zone Refrigerant Pipe and
Cable(s) in a Utility Conduit.
Ground
Safe zone
Lightning rod
3URWHFWLRQ$QJOHÛaÛ
5 feet
Lightning rod
Underground Refrigerant Piping
Refrigerant pipe installed underground must be routed inside a vapor
tight protective sleeve to prevent insulation deterioration and water
infiltration. Refrigerant pipe installed inside underground
casing must be continuous without any joints. Underground refriger-
ant pipe must be located at a level below the frost line.
Figure 28: Lightning Protection Diagram.
Table 26: Utility Conduit Sizes (Inches).
Table 27: Outdoor Unit Refrigerant Pipe Connections.
Model
Liquid Conn.
(inches)
Vapor Conn.
(inches)
LS243HLV3, LS303HLV3, LS363HLV3 3/8 Flare 5/8 Flare
Table 28: 6DIHW\=RQH6SHFL¿FDWLRQV
1
OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation jacket.
2
Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required thickness will
vary based on surrounding ambient conditions and must be calculated and specified by the design
engineer.
3
Insulation thickness (value in parenthesis) = 3/8 inch.
4
Insulation thickness (value in parenthesis) = 1 inch.
5
Insulation thickness (value in parenthesis) = 3/4 inch.
Liquid Pipe
1
Vapor Pipe
1
3/8 (2.0
2,5
) 1/2 (2.0
2,5
) 5/8 (2-1/8
2,5
) 3/4 (2-1/4
2,5
)
1/4 (1.0)
3
4444
3/8 (1-1/8)
3
4445
1/2 (1-1/2)
4
5555
5/8 (1-5/8)
4
5555
3/4 (1-3/4)
4
5555
Vapor Line
Liquid Line
Min. 14 Gauge
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
If the building does not include lightning protection, the outdoor unit will be damaged from a lightning strike. Inform the customer of this possibility in
advance.
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