Multi F Engineering Manual

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Table Of Contents

PLACEMENT CONSIDERATIONS

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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.

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.

Planning for Snow and Ice, continued.

Ocean winds

Windbreaker

Oceanside Installation Precautions

• Install the outdoor unit on the side of the building opposite from

direct ocean winds.

• Select a location with good drainage.

• Periodically clean dust or salt particles off of the heat exchanger

with water.

• Avoid installing the outdoor unit where it would be directly exposed

to ocean winds.

Additional anti-corrosion treatment may need to be applied to the out-

door unit at oceanside locations.

If the outdoor unit must be

placed in a location where it

would be subjected to direct

ocean winds, install a concrete

windbreaker strong enough to

block any winds. Windbreaker

height and width must be more

than 150% of the outdoor unit,

and be installed at least 27-1/2

inches away from the outdoor

unit to allow for airflow.

Ocean winds can cause corrosion, particularly on the condenser and

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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.

Ground

Safe zone

Lightning rod

Protection Angle (25˚~55˚)

1.5m

5 feet

Lightning rod

Figure 57: Lightning Protection Diagram.

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Building Height (feet)

66 98 148 197

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55 45 35 25

If the building does not include lightning protection, the outdoor unit can be damaged from a lightening strike. Inform the customer of this possibility

in advance.

NOTE

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68 | PIPING AND PLACEMENT

Multi F and Multi F MAX Heat Pump System Engineering Manual

MULTI

MAX

MULTI