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MODEL QTXEN110S
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 qualied person(s) in accordance
with all applicable codes and standards,
including re-rated construction codes and
standards.
4. Sufcient air is needed for proper combustion
and exhausting of gases through the ue
(chimney) of fuel burning equipment to pre-
vent 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
at ceilings only. DO NOT MOUNT THIS
PRODUCT 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 specication label on product for
further information and requirements.
HUMIDITY SENSING FAN
READ AND SAVE THESE INSTRUCTIONS
CLEANING &
MAINTENANCE
Installer: Leave this manual
with the homeowner.
For quiet and efcient 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 with the exact service motor. The
impeller should also be replaced.
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 oper-
ated 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
The humidity-sensing
fan uses a sophis-
ticated humidity sensor that responds to:
(a) rapid to moderate (user-adjustable)
increases in humidity or (b) humidity above
a user-adjustable set-point (50%-100%
relative humidity). The humidity sensor
may occasionally turn the fan ON when
environmental conditions change. If the
fan continuously responds to changing
environmental conditions, “SENSITIVITY”
adjustment may be required.
MANUAL ON WITH TIMED OFF
The humidity sensing fan has an additional
operation feature. For odor or vapor con
-
trol, the fan can be energized by cycling
the power switch. Once the fan has been
energized in this manner, it will remain on
for the user-adjustable “TIMER” period (5
to 60 minutes). This period is factory-set
for 20 minutes.
To manually energize the fan:
1. If fan power switch is already ON,
proceed to Step 2; otherwise, turn power
switch ON for more than 1 second.
2. Turn fan power switch OFF for less than
1 second.
3. Turn fan power switch back ON and fan
will turn ON.
SENSITIVITY ADJUSTMENT
The “SENSITIVITY” has been factory set
for most shower applications. However,
if the fan is in a tub area or is being used
for dampness control, the “SENSITIVITY”
may need to be increased toward maximum
(“MAX.”). If the control is responding too
often to changing environmental conditions,
movement toward less (“MIN.”) “SENSITIV-
ITY” may be required.
To adjust the “SENSITIVITY”:
1. Disconnect power at service entrance.
2. Through the grille, locate the screwdriver
slot marked “SENSITIVITY”.
3. Using a small, at-blade screwdriver,
carefully rotate the “SENSITIVITY”
adjustment toward “MAX.” or “MIN.”
4. Turn on power and check operation by
turning on the shower or other humidity
source until the fan turns on.
5. Repeat above steps if necessary.
TIMER ADJUSTMENT
The humidity sensing fan has a “TIMER”
that can be adjusted from 5 to 60 minutes
(factory-set at 20 minutes). This “TIMER”
controls the length of time that the fan re
-
mains ON (a) after the sensor has stopped
sensing a rise in humidity and the humidity
level is below the user-adjustable set-point
or (b) after being energized by cycling the
power switch.
To adjust the “TIMER”:
1. Disconnect power at service entrance.
2. Through the grille, locate the screwdriver
slot marked “TIMER”.
3. Using a small, at-blade screwdriver,
carefully rotate the “TIMER” adjustment
to desired setting (from 5 to 60
minutes).
4. Check operation by cycling the power
switch as instructed under “MANUAL
ON WITH TIMED OFF” or by turning
on a humidity source until the fan turns
on.
5. Turn humidity source off and time the
unit.
6. Repeat above steps if necessary.
To register this product visit:
www.nutone.com
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