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MODEL QTXEN110S
HUMIDITY SENSING FAN
READ AND SAVE THESE INSTRUCTIONS
To register this product visit:
www.nutone.com
WARNING
TO REDUCE THE RISK OF FIRE, ELEC-
TRIC 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 ser-
vice 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 combus-
tion and exhausting of gases through the
flue (chimney) of fuel burning equipment to
prevent backdrafting. Follow the heating equip-
ment manufacturer’s guideline and safety
standards such as those published by the
National Fire Protection Association (NFPA),
and the American Society for Heating, Re-
frigeration 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.
8. This unit must be grounded.
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 PROD-
UCT IN A WALL.
3. To avoid motor bearing damage and noisy
and/or unbalanced impellers, keep drywall
spray, construction dust, etc. off power unit.
4. Please read specification label on product for
further information and requirements.
CLEANING &
MAINTENANCE
Installer: Leave this manual
with the homeowner.
For quiet and efficient operation, long life,
and attractive appearance - lower or remove
grille and vacuum interior of unit with the
dusting brush attachment.
The motor is permanently lubricated and
never needs oiling. If the motor bearings
are making excessive or unusual noises,
replace the motor/blower wheel assembly.
SENSOR CLEANING
The humidity sensor is mounted in the grille.
The sensor will operate most reliably when
cleaned occasionally as follows:
1. Disconnect power at service entrance.
2. Remove the grille. 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.
3. DO NOT USE cleaning sprays, solvents,
or water on or near the sensor!
OPERATION
The humidity control and fan can be op-
erated separately. Use a 1 or 2-function
wall control. Do not use a dimmer switch
to operate the humidity control or light.
See “Connect Wiring” for details.
SENSOR OPERATION
This humidity-sensing
fan responds to: (a)
rapid to moderate humidity increases and
(b) humidity above a 50%-80% relative
humidity (RH) set-point. (a) and (b) are
set with “HUMIDITY” adjustment. Fan may
occasionally turn on when environmental
conditions change. If the fan continuously
responds to changing environmental con-
ditions, “HUMIDITY” adjustment may be
required (see section below).
STATUS INDICATOR
This indicator can only be seen by looking
directly at it. Normal mode is 5-seconds on
and off. If it blinks rapidly for 5-seconds and
then off, check sensor connections on grille
and fan housing.
MANUAL ON WITH TIMED OFF
For odor or vapor control, the fan can be
energized by cycling its wall-mounted switch
if one is installed. Once the fan has been
turned on in this manner, it will remain on
for the set “MINUTES” period.
To manually energize the fan:
1. Go to Step 2 if switch is already on;
otherwise, turn switch on for more than
1 second.
2. Switch off for less than 1 second.
3. Switch back on and fan will turn on.
HUMIDITY ADJUSTMENT
“HUMIDITY” has been factory set for most
shower applications. If the fan is in a tub
area or is used for dampness control, the
“HUMIDITY” may need to be decreased
toward 50% RH. If the control is responding
too often to changing environmental condi-
tions, adjustment toward 80% RH may be
required. To adjust the “HUMIDITY”:
1. Turn power off at electrical service
panel.
2. Through the grille, locate the “HUMIDITY”
screwdriver slot.
3. Using a small, flat-blade screwdriver,
carefully rotate “HUMIDITY” adjustment
toward 50 or 80.
4. Turn power on and check operation by
turning on shower or other humidity
source until fan turns on.
5. Repeat above steps if necessary.
TIMER ADJUSTMENT
This humidity-sensing fan has a timer. It is
user-adjustable from 5 to 60 minutes and is
factory-set at 20 minutes. The timer controls
how long the fan remains on (a) after rise
in humidity and (b) humidity level are both
below the user-adjustable “HUMIDITY”
setting or after being energized by cycling
power switch.
To adjust the timer:
1. Disconnect power at electrical service
panel.
2. Through the grille, locate the “MINUTES”
screwdriver slot.
3. Using a small, flat-blade screwdriver,
carefully rotate “MINUTES” adjustment
to desired setting (5 to 60 minutes).
4. Check operation by cycling power switch
as instructed under “MANUAL ON WITH
TIMED OFF” or by turning on a humidity
source until fan turns on.
5. Check timer setting with watch or clock
after turning humidity source off if it was
turned on it Step 4.
6. Repeat above steps if necessary.