Rooftop Installations; Planning For Snow And Ice - LG MULTI F LMU18CHV Installation Manual

GENERAL INSTALLATION GUIDELINES
Location for Outdoor Unit

Rooftop Installations

If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and anchoring method are adequate for
the unit location. Consult local codes regarding rooftop mounting.

Planning for Snow and Ice

In climates that experience snow buildup, place the unit on a raised platform to ensure proper condenser airflow. The raised support platform
must be high enough to allow the unit to remain above possible snow drifts. Mount the unit on a field-provided stand that is higher than the
maximum anticipated snowfall for the location. Design the mounting base to prevent snow accumulation on the platform in front or back of
the unit case. If necessary, provide a field fabricated hood to keep snow and ice and/or drifting snow from accumulating on the coil surfaces.
Use inlet and discharge duct or hoods to prevent snow or rain from accumulating on the fan inlet and outlet guards. Best practice prevents
snow from accumulating on top of the unit. Consider tie-down requirements in case of high winds or where required by local codes.
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.
Lightening Protection
• To protect the outdoor unit from lightning, it should be placed within
the specified lightning safety zone.
Table 6:
Building Height (feet)
• Power cable and communication cable should be installed five (5)
feet away from lightning rod.
• A high-resistance ground system should be included to protect
against induced lightning or indirect strike.
14
66 98 148 197
55 45 35 25
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Figure 1: Lightening Protection Diagram.
Lightning rod Lightning rod
If the building does not include lightning protection, the outdoor
unit may be damaged from a lightening strike. Inform the customer
of this possibility in advance.
F
MULTI
F
MULTI
Protection Angle (25˚~55˚)
5 feet 1.5m
Safe zone
Ground
MAX