Broan-NuTone BELS8 Roomside Series Humidity Sensing Bathroom Exhaust Fan Installation Guide
Broan-NuTone BELS8 is a humidity sensing fan/light combo designed to improve indoor air quality by automatically turning on when humidity levels reach a certain threshold. It features a timer, adjustable humidity settings, manual operation, and a variety of mounting options. This makes it suitable for bathrooms, kitchens, or other areas where humidity control is important.
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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 disconnecting
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 qualified
person(s) in accordance with all applicable codes and standards,
including fire-rated construction codes and standards.
4. Sufficient air is needed for proper combustion and exhausting of
gases through the flue (chimney) of fuel burning equipment to
prevent backdrafting. Follow the heating equipment manufacturer’s
guideline 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 authorities.
5. When cutting or drilling into wall or ceiling, do not damage electrical
wiring and other hidden utilities.
6. Ducted fans must always be vented to the outdoors.
7. Acceptable for use over a tub or shower when connected to a GFCI
(Ground Fault Circuit Interrupter) - protected branch circuit (ceiling
installation only).
8. This unit must be grounded.
9. Do not use this fan with any solid-state speed control device.
10. Do not use replacement parts that have not been recommended
by Broan NuTone LLC.
11. If the fan makes excessive noise or if there is unusual noise or
smells of smoke. Disconnect power supply and contact customer
service.
12. The wearing of safety glasses and gloves is recommended when
installing, maintaining or cleaning the unit to reduce the risk of
injury that could be caused by the presence of thin metal and/or
moving parts.
CAUTION
1. For general ventilating use only. Do not use to exhaust hazardous
or explosive materials and vapors.
2. Install the fan at least 8 feet (2.4 m) above the floor.
3. To avoid motor bearing damage and noisy and/or unbalanced
impellers, keep drywall spray, construction dust, etc. off power
unit.
4. DO NOT TOUCH THE HUMIDITY-SENSING CIRCUIT BOARD.
Electrostatic discharge may damage the circuit board.
5. Please read specification label on product for further information
and requirements.
CLEANING & MAINTENANCE
TO CLEAN THE GRILLE: Remove the grille and grille trim. Plastic
parts can be cleaned with mild detergent, such as dishwashing
liquid. Dry with a soft cloth. DO NOT USE ABRASIVE CLOTH, STEEL
WOOL PADS OR SCOURING POWDERS.
TO CLEAN INTERIOR OF THE UNIT: Once the grille and grille trim
are removed, gently vacuum interior of the unit with the dusting
brush attachment.
READ AND SAVE THESE INSTRUCTIONS
TO CLEAN THE SENSOR: Remove the grille and grille trim. Use a
dry dustcloth, clean toothbrush or lightly vacuum to clean sensor
and grille. DO NOT USE ABRASIVE CLOTH, STEEL WOOL PADS OR
SCOURING POWDERS. DO NOT USE cleaning sprays, solvents or
water on or near sensor!
The motor is permanently lubricated and never needs oiling. If the
motor bearings are making excessive or unusual noises, replace the
blower assembly (includes motor and impeller).
OPERATION
Use an on/off switch to operate the fan, light and sensor. The
fan, light and sensor can be operated separately if an appropriate
3-function wall control is used.
Refer to Broan-NuTone catalog for a complete line of accessories/
controls to effectively adapt these fans to your requirements.
SENSOR OPERATION
To activate the humidity sensor, turn the humidity switch ON.
The fan will run automatically when the set Humidity condition
is met, and stop automatically when the timer condition is met.
The Humidity Sensor may occasionally turn the fan ON when
environmental conditions change.
BELS8 Roomside Series
Humidity Sensing Fan/Light For Warranty Statement, Service Parts, Technical Support,
or to Register your product, please visit our website or call:
In the United States - Broan-NuTone.com 800-558-1711.
In Canada - Broan-NuTone.ca 800-567-3855.
HUMIDITY
OFF
50
90
8070
60
100
TIME
60
50
40
30
20
0
10
%
% HUMIDITY ADJUSTMENT
To adjust the % HUMIDITY:
1. Turn power off at electrical service panel.
2. Use a small screwdriver to carefully rotate %HUMIDITY control
to desired level. If fan is not responding to changing humidity
conditions, adjust towards 50%. If fan is responding too often to
changing humidity conditions, adjust towards 100%.
3. Turn power on.
4. Repeat above steps if necessary.
MINUTES ADJUSTMENT (TIMER)
This humidity-sensing fan has a timer that controls how long the
fan remains on after the humidity in the room returns to the user-
adjustable set-point.
To adjust the timer:
1. Disconnect power at electrical service panel.
2. Use a small screwdriver to carefully rotate MINUTES control to
increase or decrease time.
3. Turn power on.
4. Repeat above steps if necessary.
If fan is still not responding as desired after making adjustments,
contact Broan Technical Support.
MANUAL ON
To manually energize the fan:
- Turn the fan only switch on
or
- Cycle the Humidity switch on/off/on.
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 disconnecting
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 qualified
person(s) in accordance with all applicable codes and standards,
including fire-rated construction codes and standards.
4. Sufficient air is needed for proper combustion and exhausting of
gases through the flue (chimney) of fuel burning equipment to
prevent backdrafting. Follow the heating equipment manufacturer’s
guideline 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 authorities.
5. When cutting or drilling into wall or ceiling, do not damage electrical
wiring and other hidden utilities.
6. Ducted fans must always be vented to the outdoors.
7. Acceptable for use over a tub or shower when connected to a GFCI
(Ground Fault Circuit Interrupter) - protected branch circuit (ceiling
installation only).
8. This unit must be grounded.
9. Do not use this fan with any solid-state speed control device.
10. Do not use replacement parts that have not been recommended
by Broan NuTone LLC.
11. If the fan makes excessive noise or if there is unusual noise or
smells of smoke. Disconnect power supply and contact customer
service.
12. The wearing of safety glasses and gloves is recommended when
installing, maintaining or cleaning the unit to reduce the risk of
injury that could be caused by the presence of thin metal and/or
moving parts.
CAUTION
1. For general ventilating use only. Do not use to exhaust hazardous
or explosive materials and vapors.
2. Install the fan at least 8 feet (2.4 m) above the floor.
3. To avoid motor bearing damage and noisy and/or unbalanced
impellers, keep drywall spray, construction dust, etc. off power
unit.
4. DO NOT TOUCH THE HUMIDITY-SENSING CIRCUIT BOARD.
Electrostatic discharge may damage the circuit board.
5. Please read specification label on product for further information
and requirements.
CLEANING & MAINTENANCE
TO CLEAN THE GRILLE: Remove the grille and grille trim. Plastic
parts can be cleaned with mild detergent, such as dishwashing
liquid. Dry with a soft cloth. DO NOT USE ABRASIVE CLOTH, STEEL
WOOL PADS OR SCOURING POWDERS.
TO CLEAN INTERIOR OF THE UNIT: Once the grille and grille trim
are removed, gently vacuum interior of the unit with the dusting
brush attachment.
READ AND SAVE THESE INSTRUCTIONS
TO CLEAN THE SENSOR: Remove the grille and grille trim. Use a
dry dustcloth, clean toothbrush or lightly vacuum to clean sensor
and grille. DO NOT USE ABRASIVE CLOTH, STEEL WOOL PADS OR
SCOURING POWDERS. DO NOT USE cleaning sprays, solvents or
water on or near sensor!
The motor is permanently lubricated and never needs oiling. If the
motor bearings are making excessive or unusual noises, replace the
blower assembly (includes motor and impeller).
OPERATION
Use an on/off switch to operate the fan, light and sensor. The
fan, light and sensor can be operated separately if an appropriate
3-function wall control is used.
Refer to Broan-NuTone catalog for a complete line of accessories/
controls to effectively adapt these fans to your requirements.
SENSOR OPERATION
To activate the humidity sensor, turn the humidity switch ON.
The fan will run automatically when the set Humidity condition
is met, and stop automatically when the timer condition is met.
The Humidity Sensor may occasionally turn the fan ON when
environmental conditions change.
BELS8 Roomside Series
Humidity Sensing Fan/Light For Warranty Statement, Service Parts, Technical Support,
or to Register your product, please visit our website or call:
In the United States - Broan-NuTone.com 800-558-1711.
In Canada - Broan-NuTone.ca 800-567-3855.
HUMIDITY
OFF
50
90
8070
60
100
TIME
60
50
40
30
20
0
10
%
% HUMIDITY ADJUSTMENT
To adjust the % HUMIDITY:
1. Turn power off at electrical service panel.
2. Use a small screwdriver to carefully rotate %HUMIDITY control
to desired level. If fan is not responding to changing humidity
conditions, adjust towards 50%. If fan is responding too often to
changing humidity conditions, adjust towards 100%.
3. Turn power on.
4. Repeat above steps if necessary.
MINUTES ADJUSTMENT (TIMER)
This humidity-sensing fan has a timer that controls how long the
fan remains on after the humidity in the room returns to the user-
adjustable set-point.
To adjust the timer:
1. Disconnect power at electrical service panel.
2. Use a small screwdriver to carefully rotate MINUTES control to
increase or decrease time.
3. Turn power on.
4. Repeat above steps if necessary.
If fan is still not responding as desired after making adjustments,
contact Broan Technical Support.
MANUAL ON
To manually energize the fan:
- Turn the fan only switch on
or
- Cycle the Humidity switch on/off/on.
2
OPTION - To mount housing anywhere between ceiling framing:
Use optional Hanger Bar Kit (sold separately from local distributors
or website). Follow mounting instructions included with kit.
ROOF CAP* (with built-in damper)
WALL CAP*
(with built-in
damper)4-IN. ROUND
ELBOWS*
FAN
HOUSING
Seal gaps
around
housing.
Seal duct joints
with tape.
INSULATION
(Place around and
over fan housing.)
POWER
CABLE *
* Purchase separately.
OR
Keep duct
runs short.
4-IN. ROUND
DUCT*
IMPORTANT - The ducting from this fan to the outside of the building
has a strong effect on the air flow, noise and energy use of the fan. Use
the shortest, straightest duct routing possible for best performance, and
avoid installing the fan with smaller ducts than recommended. Insulation
around the ducts can reduce energy loss and inhibit mold growth. Fans
installed with existing ducts may not achieve their rated airflow.
Cooking
Equipment
Floor
COOKING AREA
Do not install above or
inside this area.
45 o 45 o
NOT FOR USE IN
A COOKING AREA.
QUICK START GUIDE
Scan this QR code for
Installation video.
11 Remove from packaging. Remove blower assembly and wiring panel.
BLOWER
ASSEMBLY
WIRING
PANEL
New Construction Retrofit
12 Mount housing.
Choose one option to mount housing to ceiling structure: Note: If you are
installing retrofit, bend
the ears in and use the
mask from packaging to
cut opening to correct
size.
WOOD
BLOCKING
I-JOIST
or
Other options:
- Hanger bars (sold separately Model Number MHB4)
- Flange Install (see Installation video)
(IF REQUIRED)
Use this mask to prevent construction dust, drywall spray,
or paint from damaging inside of product.
REMOVE MASK BEFORE INSTALLING GRILLE.
Utiliser ce couvercle pour empêcher la poussière de construction,
le plâtre ou la peinture d'endommager l'intérieur du produit.
ENLEVER LE COUVERCLE AVANT D'INSTALLER LA GRILLE.
Utilice esta cubierta para prevenir daños al interior del producto
debidos a polvo de construcción, rociado en
el panel de yeso o pintura.
RETIRE LA CUBIERTA ANTES DE INSTALAR LA REJILLA
HOUSING MOUNTING EAR
SENSOR
OPTION - To mount housing anywhere between ceiling framing:
Use optional Hanger Bar Kit (sold separately from local distributors
or website). Follow mounting instructions included with kit.
ROOF CAP* (with built-in damper)
WALL CAP*
(with built-in
damper)4-IN. ROUND
ELBOWS*
FAN
HOUSING
Seal gaps
around
housing.
Seal duct joints
with tape.
INSULATION
(Place around and
over fan housing.)
POWER
CABLE *
* Purchase separately.
OR
Keep duct
runs short.
4-IN. ROUND
DUCT*
IMPORTANT - The ducting from this fan to the outside of the building
has a strong effect on the air flow, noise and energy use of the fan. Use
the shortest, straightest duct routing possible for best performance, and
avoid installing the fan with smaller ducts than recommended. Insulation
around the ducts can reduce energy loss and inhibit mold growth. Fans
installed with existing ducts may not achieve their rated airflow.
Cooking
Equipment
Floor
COOKING AREA
Do not install above or
inside this area.
45 o 45 o
NOT FOR USE IN
A COOKING AREA.
QUICK START GUIDE
Scan this QR code for
Installation video.
11 Remove from packaging. Remove blower assembly and wiring panel.
BLOWER
ASSEMBLY
WIRING
PANEL
New Construction Retrofit
12 Mount housing.
Choose one option to mount housing to ceiling structure: Note: If you are
installing retrofit, bend
the ears in and use the
mask from packaging to
cut opening to correct
size.
WOOD
BLOCKING
I-JOIST
or
Other options:
- Hanger bars (sold separately Model Number MHB4)
- Flange Install (see Installation video)
(IF REQUIRED)
Use this mask to prevent construction dust, drywall spray,
or paint from damaging inside of product.
REMOVE MASK BEFORE INSTALLING GRILLE.
Utiliser ce couvercle pour empêcher la poussière de construction,
le plâtre ou la peinture d'endommager l'intérieur du produit.
ENLEVER LE COUVERCLE AVANT D'INSTALLER LA GRILLE.
Utilice esta cubierta para prevenir daños al interior del producto
debidos a polvo de construcción, rociado en
el panel de yeso o pintura.
RETIRE LA CUBIERTA ANTES DE INSTALAR LA REJILLA
HOUSING MOUNTING EAR
SENSOR
3
13 Choose one option to attach duct connector.
Pro Tip: First and last 18" of the ducting should be rigid or stretched straight for expected performance.
14 Connect wiring.
15 Attach wire enclosure by tab and screw.
TABS
FOIL TAPE
FOIL TAPE
New Construction Retrofit
or
Install duct connector (use screw from parts bag
and ensure tabs engage in housing), then attach new
construction ductwork with foil tape.
TABS
Pull ductwork into housing and attach to duct connector
with foil tape, then install duct connector (use screw from
parts bag and ensure tabs engage in housing).
Re-install wiring panel and secure with screw
from parts bag.16
Scan this QR code for
helpful hints.WIRING OPTION # 1
• When first switch (1) is ON, fan will operate automatically
based on room humidity conditions.
• Turn fan ON immediately for the set timer period (to
control odors), by cycling first switch (1) ON/OFF/ON.
• Use second switch (2) to turn light ON/OFF.
• With optional connection shown, fan will always be ON
when light is ON.
WIRING OPTION # 2
• When first switch (1) is ON, fan will operate automatically
based on room humidity conditions.
• Turn fan ON immediately (to control odors), by using
second switch (2).
• Use third switch (3) to turn light ON/OFF.
BLK
HUMIDITY
CONTROL
LIGHT
FAN
GREY
BRNBLK
RED BLK
BLK
WHT
WHT
WHTWHTWHT
GRD GRD
LIGHT
(ON/OFF)
FAN
(AUTO/OFF)
120
VAC
LINE
IN
COM
2-FUNCTION CONTROL
(PURCHASE SEPARATELY)
WHT
GRD
SWITCH UNIT
(Optional)
(1)
(2)
3-FUNCTION CONTROL
(PURCHASE SEPARATELY)
LIGHT
(ON/OFF)
COM
FAN
(ON/OFF)
FAN AUTO
(AUTO/OFF)
120
VAC
LINE
IN
SWITCH
WHT
GRD
BLK
BLK
WHT
UNIT
BLK
WHT
GRD
BLK
RED
LIGHT
WHT
WHT
BLK WHT
BRN HUMIDITY
CONTROL
FAN
WHT
(1)
(2)
(3)
GREY
RED
13 Choose one option to attach duct connector.
Pro Tip: First and last 18" of the ducting should be rigid or stretched straight for expected performance.
14 Connect wiring.
15 Attach wire enclosure by tab and screw.
TABS
FOIL TAPE
FOIL TAPE
New Construction Retrofit
or
Install duct connector (use screw from parts bag
and ensure tabs engage in housing), then attach new
construction ductwork with foil tape.
TABS
Pull ductwork into housing and attach to duct connector
with foil tape, then install duct connector (use screw from
parts bag and ensure tabs engage in housing).
Re-install wiring panel and secure with screw
from parts bag.16
Scan this QR code for
helpful hints.WIRING OPTION # 1
• When first switch (1) is ON, fan will operate automatically
based on room humidity conditions.
• Turn fan ON immediately for the set timer period (to
control odors), by cycling first switch (1) ON/OFF/ON.
• Use second switch (2) to turn light ON/OFF.
• With optional connection shown, fan will always be ON
when light is ON.
WIRING OPTION # 2
• When first switch (1) is ON, fan will operate automatically
based on room humidity conditions.
• Turn fan ON immediately (to control odors), by using
second switch (2).
• Use third switch (3) to turn light ON/OFF.
BLK
HUMIDITY
CONTROL
LIGHT
FAN
GREY
BRNBLK
RED BLK
BLK
WHT
WHT
WHTWHTWHT
GRD GRD
LIGHT
(ON/OFF)
FAN
(AUTO/OFF)
120
VAC
LINE
IN
COM
2-FUNCTION CONTROL
(PURCHASE SEPARATELY)
WHT
GRD
SWITCH UNIT
(Optional)
(1)
(2)
3-FUNCTION CONTROL
(PURCHASE SEPARATELY)
LIGHT
(ON/OFF)
COM
FAN
(ON/OFF)
FAN AUTO
(AUTO/OFF)
120
VAC
LINE
IN
SWITCH
WHT
GRD
BLK
BLK
WHT
UNIT
BLK
WHT
GRD
BLK
RED
LIGHT
WHT
WHT
BLK WHT
BRN HUMIDITY
CONTROL
FAN
WHT
(1)
(2)
(3)
GREY
RED
4 1115131A
Install the blower assembly and sensor with provided screws. Plug in blower. Plug in sensor.
Note: For new construction, use mask to protect blower until ceiling is finished.17
Install the grille trim with screws from parts bag.
18
Install the grille by sliding clips into grille trim.
DUCT CONNECTOR HOUSING
BLOWER ASSEMBLY
WIRING PANEL
GRILLE TRIM
BELS8 GRILLE
Use this mask to prevent construction dust, drywall spray,
or paint from damaging inside of product.
REMOVE MASK BEFORE INSTALLING GRILLE.
Utiliser ce couvercle pour empêcher la poussière de construction,
le plâtre ou la peinture d'endommager l'intérieur du produit.
ENLEVER LE COUVERCLE AVANT D'INSTALLER LA GRILLE.
Utilice esta cubierta para prevenir daños al interior del producto
debidos a polvo de construcción, rociado en
el panel de yeso o pintura.
RETIRE LA CUBIERTA ANTES DE INSTALAR LA REJILLA
110
Note: Depending upon model, your grille may look different.
SENSOR
LED MODULE
Plug in LED module.9
MOTOR PLUG
SENSOR
PLUG
LED
MODULE
PLUG
Install the blower assembly and sensor with provided screws. Plug in blower. Plug in sensor.
Note: For new construction, use mask to protect blower until ceiling is finished.17
Install the grille trim with screws from parts bag.
18
Install the grille by sliding clips into grille trim.
DUCT CONNECTOR HOUSING
BLOWER ASSEMBLY
WIRING PANEL
GRILLE TRIM
BELS8 GRILLE
Use this mask to prevent construction dust, drywall spray,
or paint from damaging inside of product.
REMOVE MASK BEFORE INSTALLING GRILLE.
Utiliser ce couvercle pour empêcher la poussière de construction,
le plâtre ou la peinture d'endommager l'intérieur du produit.
ENLEVER LE COUVERCLE AVANT D'INSTALLER LA GRILLE.
Utilice esta cubierta para prevenir daños al interior del producto
debidos a polvo de construcción, rociado en
el panel de yeso o pintura.
RETIRE LA CUBIERTA ANTES DE INSTALAR LA REJILLA
110
Note: Depending upon model, your grille may look different.
SENSOR
LED MODULE
Plug in LED module.9
MOTOR PLUG
SENSOR
PLUG
LED
MODULE
PLUG
5
6
7
8
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Key features
- Humidity Sensing
- Timer
- Adjustable Humidity Settings
- Manual Operation
- Light fixture
- Quiet Operation
- Energy Efficient
- Easy Installation
- GFCI Protected
- Durable Construction
Frequently asked questions
Turn the power off at the electrical panel. Use a small screwdriver to rotate the %HUMIDITY control to the desired level. If the fan is not responding to humidity changes, adjust towards 50%. If it's responding too often, adjust toward 100%. Turn the power back on.
You can manually turn the fan on by either turning the fan-only switch on or by cycling the humidity switch on/off/on.
The timer controls how long the fan remains on after the humidity in the room has returned to the set-point. You can adjust the timer duration with a small screwdriver.