NuTone 788CHNT Quick Start Manual
ADDITIONAL
JOIST
!
MODEL 788CHNT
DECORATIVE VENTILATION
FAN WITH LIGHT
READ AND SAVE THESE INSTRUCTIONS
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 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. Do not install in a tub or shower enclosure.
8. Not for use in kitchens.
9. This unit must be grounded.
10. This unit is U.L. listed. Type I.C. inherently protected.
TYPICAL INSTALLATIONS
2 x 4
CEILING
JOIST
CEILING
MATERIAL
HOUSING
HOUSING
HOUSING MOUNTED
DIRECTLY TO JOIST
2x6 (or larger)
GRILLE
PAN
GLASS
LIGHT SHADE
CEILING
JOIST or
TRUSS
CEILING
MATERIAL
HOUSING
HOUSING
HOUSING MOUNTED
TO 2x4 TRUSS
Discharge parallel to joists.
Discharge parallel to joists.
FRAMING
*
HOUSING
HOUSING
"I"
JOIST
CEILING
MATERIAL
GLASS LIGHT SHADE
GRILLE
PAN
"I"
HOUSING MOUNTED TO “I” JOIST
Requires additional framing
for mounting.
Discharge parallel to joists.
Additional framing must be a 2x6 (minimum height), at least 9-inches long.
*
CEILING
JOIST or
TRUSS
GRILLE
GLASS
LIGHT SHADE
2 x 4
PAN
CAUTION
1. For general ventilating use only. Do not use to exhaust
hazardous or explosive materials and vapors.
2. This product is designed for installation in FLAT CEILINGS
ONLY. Do not mount this product in a wall.
3. The light fixture assembly must be mounted to the fan housing assembly included with this product. Do not mount the
light fixture assembly to a wiring outlet box.
4. To avoid motor bearing damage and noisy and/or unbalanced impellers, keep drywall spray, construction dust, etc.
off power unit.
5. Please read specification label on product for further information and requirements.
Installer: Leave this manual with the
homeowner.
Homeowner: Use and Care
information on page 4.
PLAN THE INSTALLATION
INSULATION
(Place around and
over fan housing.)
FAN
HOUSING
POWER
CABLE*
Seal gaps
around
housing.
4-IN. ROUND
DUCT*
*Purchase
separately.
Seal duct
joints with
tape.
4-IN. ROUND
OR
ELBOWS*
ROOF CAP*
(with built-in
damper)
Keep duct
runs short.
WALL CAP*
(with built-in
damper)
PREPARE THE HOUSING
1. Unplug blower and remove (3) screws securing blower
assembly to housing.
MODEL 788CHNT
Page 2
INSTALL THE HOUSING
New Construction
1. Choose the location for your fan/light in the ceiling. For
best possible performance, use the shortest possible duct
run and a minimum number of elbows.
TAB
2. Remove blower assembly from housing and set blower
assembly aside.
TAB
MOUNTING SCREWS
2. Position fan housing against joist so that bottom
edge of housing will be flush with finished ceiling.
Additional positioning feature for 1/2” thick
ceiling material:
Bend two tabs, on side of housing,
housing until tabs contact bottom edge of joist.
3. Use (4) mounting screws (included) to attach housing
to joist.
BOTTOM EDGE OF JOIST
900 outward. Lift
Existing Construction
1. Choose the location for your fan/light in the ceiling. For
best possible performance, use the shortest possible duct
run and a minimum number of elbows.
2. In attic,
position fan
housing
against joist.
Trace outline
of housing
on ceiling
material.
3. Remove wiring plate from housing and set plate aside.
3. Set housing aside
and cut ceiling
opening slightly
larger than marked.
UNIT
SWITCH BOX
LINE
4. Place housing in
MATERIAL & HOUSING
opening so that
its bottom edge is
flush with finished
ceiling. Screw
housing to joist
through holes in
housing as shown.
5. Seal between
ceiling material and
SEAL BETWEEN CEILING
housing to prevent
air leakage.
MOUNTING SCREWS
INSTALL THE DUCTWORK
NOTE: The duct connector has a counter-balanced damper
flap. The flap will be “open” approx. 1” when duct connector
is attached to housing. This design permits insulation to be
in direct contact with fan/light housing per UL (Underwriters
Laboratories) standards. The slightest backdraft, however,
will close the damper flap, preventing air from entering unit
or finished space.
1. Connect 4” round
duct to damper/
duct connector
and extend duct
to outside through
a roof or wall cap.
Check damper to
make sure that it
opens freely. Tape
all duct connections to make them secure and air tight.
MODEL 788CHNT
Page 3
FINISH THE INSTALLATION
1. Re-install blower
assembly removed
in Step 1 under
“PREPARE THE
HOUSING”. Plug blower
into black receptacle.
2. Attach grille pan
mounting brackets to
housing with screws
(included). Make sure
brackets face inward.
CONNECT THE WIRING
SCHEMATIC WIRING DIAGRAM
LIGHT
SWITCH
VENT
SWITCH
BLK
WHT
IN
GRD
LIGHT
FAN
DUAL CONTROL
(purchase separately)
BLACK
WHITE
BLUE
SWITCH BOX
120 VAC LINE IN
RED
BLK
WHT
GRD
BLU
BLK
RED
GROUND
(bare)
LIGHT
(WHITE)
(BLACK)
1. Wire unit as shown. Re-install wiring plate removed in
Step 2 under “PREPARE THE HOUSING”.
2. Run electrical cable as direct as possible to unit. Do not
allow cable to touch sides or top of unit after installation
is complete.
VENT
BLACK
RECEPTACLE
(FAN)
WHITE
RECEPTACLE
(LIGHT)
WHT
WHT
3. Locate grille pan
over fan housing and
connect light plug into
white receptacle in fan
housing.
4. Attach grille pan to
mounting brackets with
(2) screws (included).
5. Thread rod onto
threaded stud in center
of grille pan. Tighten rod
securely.
METAL
WASHER
FELT
WASHERS
FELT
WASHER
6. Install bulbs. Use 13watt (maximum), GU24
type, fluorescent bulbs.
7. Place washers and
glass shade over
mounting rod and align
shade over grille pan.
Secure shade to grille
pan with washer and
finial nut as shown.
8. Restore electrical
power and check
operation of the unit.
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