the operation instructions. Adjust only those controls that are covered by the operating instruction, as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation.

E. If the product has been dropped or damaged in any way.

F. When the product exhibits a distinct change in perform- ance — this indicates a need for service.

20.REPLACEMENTS PARTS — When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have the sam characteristics as the original part. Unauthorized substitutions may result in fire, electric shock or other hazards.

21.SAFETY CHECK — Upon completion of any service or repairs to this product, ask the service technician to per- form safety checks to determine that the product is in proper operating condition.

22.WALL OR CEILING MOUNTING — The product should be mounted to a wall or ceiling only as recommended by the manufacturer.

23.HEAT — The product should be situated away from heat sources such as radiators, heat resistors, or other prod- ucts (including amplifiers) that produce heat.

EXAMPLE OF ANTENNA GROUNDING AS PER

NATIONAL ELECTRICAL CODE

ELECTRIC

SERVICE

EQUIPMENT

ANTENNA

LEAD IN WIRE

GROUND

CLAMP

ANTENNA

DISCHARGE UNIT

(NEC SECTION 810-20)

GROUNDING CONDUCTORS

(NEC SECTION 810-21)

GROUNDING CLAMPS

POWER SERVICE GROUNDING

ELECTRODE SYSTEM

(NEC ART 250, PART H)

NEC-NATIONAL ELECTRICAL CODE

4

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NuTone VSA4S Example of Antenna Grounding AS PER National Electrical Code, NEC-NATIONAL Electrical Code