NuTone 349BR - User Manual

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MODEL 349BR

Page 1

WARNING

TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY

TO PERSONS, OBSERVE THE FOLLOWING:

1. Use this unit only in the manner intended by the manufacturer.

If you have questions, contact the manufacturer at the address

or telephone number listed in the warranty.

2. Before servicing or cleaning unit, switch power off at service

panel and lock the service disconnecting means to prevent power

from being switched on accidentally. When the service discon-

necting means cannot be locked, securely fasten a prominent

warning device, such as a tag, to the service panel.

3. Installationworkandelectricalwiringmustbedonebyaqualied

person(s) in accordance with all applicable codes and standards,

includingre-ratedconstructioncodesandstandards.

4. Sufcientairisneededforpropercombustionandexhausting

of gases through the ue (chimney) of fuel burning equip-

ment to prevent backdrafting. Follow the heating equipment

manufacturer's guidelines and safety standards such as those

published by the National Fire Protection Association (NFPA),

and the American Society for Heating, Refrigeration and Air

Conditioning Engineers (ASHRAE), and the local code authori-

ties.

5. When cutting or drilling into wall or ceiling, do not damage

electrical wiring and other hidden utilities.

6. The wiring must be permanent. DO NOT USE AN EXTEN-

SION CORD! Use 14 GA. MINIMUM copper wire. Although

the Powered Attic Ventilator may be wired directly to power,

we advise that some type of shut off switch be installed in the

line. Please see the section on electrical wiring for suggested

wiring diagrams and instructions.

7. This unit must be grounded.

CAUTION

1. Forgeneralventilatinguseonly.Donotusetoexhausthazard-

ousorexplosivematerialsandvapors.

2. To avoid motor bearing damage and noisy and/or unbalanced

impellers, keep drywall spray, construction dust, etc. off power

unit.

3. This unit has an unguarded impeller. Do not use in locations

readily accessible to people or animals.

4. Fan is equipped with a thermostat which may start fan automati-

cally. To reduce risk of injury or electric shock while servicing

or cleaning unit, switch power off at service panel and lock

service panel to prevent power from being switched on ac-

cidentally. When the service disconnecting means cannot be

locked, securely fasten a prominent warning device, such as

a tag, to the service panel.

5. Home Ventilating Institute (HVI) recommends one square foot

of open air inlet per 300 cfm of fan capacity. The best location

for these air intake vents are under the eaves with direct ac-

cess to the attic. Failure to provide these intakes could cause

natural-draft gas appliances to backdraft.

6. Your attic fan installation will create a screened opening into

your attic space. During a heavy rain storm there could be a

light spray of rain into this attic space. This is a normal condi-

tion with all attic ventilators and will not cause any damage to

the structure. We recommend that you do not store any valu-

able articles directly under the fan opening in the roof. During

extremerainandwindstormsyoumaywanttoturnonyour

atticventilatortopreventexcessmoistureaccumulationinyour

attic.

7. Recordsshow,underidealconditions,exposedgalvanizedsteel

can remain rust free up to 100 years. For best protection, the

exposedportionoftheroofsheetshouldbepainted,especially

in areas of unusually high industrial air pollution. Follow paint

manufacturer's instructions for good adhesion.

8. This ventilator is intended for roof installation. The Broan Model

353 Gable Mount Ventilator is available for side wall applica-

tions.

9. The dome may be painted with a high-quality paint. Follow

the paint manufacturer's recommendations for powder-coated

steel.

10.Pleasereadspecicationlabelonproductforfurtherinforma-

tion and requirements.

ROOF-MOUNT

POWERED ATTIC VENTILATOR

READ AND SAVE THESE INSTRUCTIONS

❑

Slotted Screwdriver

❑

Drill

❑

1/4" Drill Bit

❑

Sabre Saw or Keyhole Saw

❑

Hammer

❑

Ruler

❑

Pencil

❑

Utility Knife

❑

PryBar(toremoverroongnails)

❑

RoongCement

❑

GalvanizedRoongNails(1¾"min.)

❑

Electrical Supplies (to comply with codes)

TOOLS AND MATERIALS REQUIRED

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Summary

Safety Information

General Safety Warnings

Key safety instructions including electrical shock, fire risk, proper installation, and grounding.

Operational Cautions

Guidelines for safe operation, preventing motor damage, and installation considerations.

Installation Procedure

Locate and Mark Ventilator Position

Determine optimal roof placement and drill a guide hole for template use.

Cut Roof Openings

Use template to cut shingles and boards for the ventilator opening.

Wiring and Thermostat Adjustment

Wiring Instructions

Guidelines for connecting the fan motor and house power cable, ensuring proper grounding.

Adjusting the Thermostat

Information on the fan thermostat's preset temperature and adjustment range.

Service Parts and Warranty

Service Parts List

Identifies key components of the ventilator with part numbers and descriptions.

Warranty Information

Details the one-year limited warranty, coverage, exclusions, and service process.

Summary

Safety Information

General Safety Warnings

Key safety instructions including electrical shock, fire risk, proper installation, and grounding.

Operational Cautions

Guidelines for safe operation, preventing motor damage, and installation considerations.

Installation Procedure

Locate and Mark Ventilator Position

Determine optimal roof placement and drill a guide hole for template use.

Cut Roof Openings

Use template to cut shingles and boards for the ventilator opening.

Wiring and Thermostat Adjustment

Wiring Instructions

Guidelines for connecting the fan motor and house power cable, ensuring proper grounding.

Adjusting the Thermostat

Information on the fan thermostat's preset temperature and adjustment range.

Service Parts and Warranty

Service Parts List

Identifies key components of the ventilator with part numbers and descriptions.

Warranty Information

Details the one-year limited warranty, coverage, exclusions, and service process.

The provided manual describes the Broan Model 349BR Roof-Mount Powered Attic Ventilator, a device designed for general ventilating use in attics. Its primary function is to exhaust hot, stale air from the attic space, helping to reduce attic temperatures and potentially lower cooling costs for the home.

Function Description:

The Broan 349BR is a powered attic ventilator that is installed on the roof. It features an impeller driven by a motor, which draws air from the attic and expels it outdoors. The unit is equipped with a thermostat that automatically controls its operation based on the ambient temperature in the attic. This allows the fan to turn on when the attic reaches a set temperature and turn off when the temperature drops 10 degrees below that set point. The thermostat is factory preset to 110°F but can be adjusted by the user to activate between 60°F and 120°F. The manual emphasizes the importance of providing sufficient air intake vents, ideally under the eaves, to ensure proper airflow and prevent backdrafting of fuel-burning appliances. The Home Ventilating Institute (HVI) recommends one square foot of open air inlet per 300 cfm of fan capacity.

Important Technical Specifications:

While specific CFM (Cubic Feet per Minute) ratings are not explicitly stated in the provided pages, the HVI recommendation for air inlet size (one square foot per 300 cfm) implies that the fan has a measurable capacity.

Power Requirement: 120 VAC, 14-gauge-with-ground house power cable is required for wiring.
Wiring: Permanent wiring is required, using 14 GA. MINIMUM copper wire. The unit must be grounded. An on/off switch can be installed in the living area for manual control.
Thermostat: Adjustable range from 60°F to 120°F, factory preset to 110°F.
Installation Hole Size: A 14 7/8" diameter hole is cut in the roof boards, and a 17 3/8" diameter circle is cut in the shingles.
Roofing Nails: Galvanized roofing nails (1 3/4" min.) are specified for securing the flashing.
Construction Materials: The unit features a galvanized steel roof sheet, which can remain rust-free for up to 100 years under ideal conditions. The dome can be painted with a high-quality paint suitable for powder-coated steel.

Usage Features:

Automatic Operation: The integrated thermostat allows for hands-free operation, activating the fan only when needed to maintain a cooler attic.
Adjustable Thermostat: Users can customize the temperature at which the fan turns on, providing flexibility based on climate and personal preference.
Manual Override (Optional): An optional on/off switch can be installed in the living area, allowing users to manually turn off the fan when not needed, such as during extreme rain and wind storms to prevent excess moisture accumulation.
Roof-Mount Design: Designed for discreet installation on the roof, with the recommendation to place it as high as possible on the rear slope so it's not visible from the street if level with the roof peak.
Durability: Constructed with galvanized steel, offering long-term resistance to rust. The dome is also paintable for aesthetic integration with the roof.

Maintenance Features:

Safety Disconnect: Before servicing or cleaning, power must be switched off at the service panel and locked out to prevent accidental activation. This is crucial given the unguarded impeller and automatic thermostat.
Cleaning: The manual advises keeping drywall spray, construction dust, and other debris off the power unit to prevent motor bearing damage and noisy/unbalanced impellers.
Sealing: After installation, all shingles and nail heads around the flashing must be sealed with a good grade of roofing cement. The bottom edge of the flashing should NOT be sealed to allow for proper drainage.
Painting: The exposed portion of the galvanized steel roof sheet should be painted, especially in areas of high industrial air pollution, to ensure best protection and adhesion. The dome can also be painted.

Safety Warnings and Cautions:

The manual includes prominent warnings regarding fire, electric shock, and injury. Key safety points include:

Qualified Installation: Installation and electrical wiring must be done by qualified personnel according to all applicable codes and standards.
Backdrafting Prevention: Ensure sufficient air intake for fuel-burning equipment to prevent backdrafting.
Wiring Integrity: Avoid damaging electrical wiring or hidden utilities when cutting or drilling.
Unguarded Impeller: The unit has an unguarded impeller and should not be used in locations readily accessible to people or animals.
Rain Spray: A light spray of rain into the attic space during heavy rain is considered normal and will not damage the structure. However, storing valuable articles directly under the fan opening is not recommended.
Hazardous Materials: Not to be used to exhaust hazardous or explosive materials and vapors.
Outlet Box Placement: Do not mount the outlet box near a heat source.

The Broan 349BR is designed as a robust and automatically controlled solution for attic ventilation, emphasizing proper installation, safety, and long-term durability.