Operation; Cleaning And Maintenance; Troubleshooting - Broan-NuTone ULTRA XN110H Guia De Instalacion

Page 12
WARNING
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.

Operation

It is normal for this ventilation fan to take approximately 5
seconds to start running after it is turned on.
Modes
(For reference, wiring diagrams are on pages 5 and 10.)
Humidity sensing:
1. Turn sensor/control wall switch on (make sure manual-
on wall switch is off if it is installed).
2. Sensor monitors humidity level for (a) moderate to rapid
rise or (b) above set-point.
3. Fan operates at certified airflow rate to reduce humidity.
4. When humidity decreases, fan enters time delay mode.
(See below.)
Manual-on (optional manual-on wall switch must be installed):
1. Turn manual-on wall switch on (sensor/control wall
switch can be on or off).
2. Fan operates at certified airflow rate.
3. Fan turns off when manual-on wall switch is turned off.
Toggle (for manual operation when optional manual-on
wall switch is not installed or manually activated timed-
off is desired):
1. Turn sensor/control wall switch on (make sure manual-
on wall switch is off if it is installed).
2. Wait at least one-second.
3. Turn switch off for less than one-second.
4. Turn switch back on.
5. Fan will operate at certified airflow rate and enter time
delay mode. (See next.)
Time Delay:
Fan continues to run until user-adjustable TIME delay has
passed, then fan turns off.
To Set User-Adjustable Humidity Sensitivity**
Using a small, flat-blade screwdriver, carefully rotate HU-
MIDITY adjustment until arrow points to desired humidity
level shown in percent relative humidity (%RH).
To Set User-Adjustable Time Delay**
Using a small, flat-blade screwdriver, carefully rotate TIME
adjustment until the arrow points to the desired minutes of
time delay.
** User-adjustable controls are located in corner of Fan
Housing behind Grille.

Cleaning and Maintenance

CAUTION
IN ORDER TO PREVENT MOTOR/CONTROL DAMAGE:
DO NOT remove motor plug to stop spinning motor.
Power must be disconnected (see WARNING at top left of
this page) before motor plug is removed or inserted into
control assembly.
To Clean
For quiet and efficient operation, long life and attractive
appearance, remove Grille and vacuum interior of unit with a
dusting brush attachment.
Do not use cleaning sprays, solvents or water on, or near, the
sensor.
Motor is permanently lubricated and never needs oiling. If
motor is making excessive or unusual noises, replace Control
Assembly and Motor.

Troubleshooting

Before continuing, turn off power as previously noted in
WARNING and CAUTION sections at the top of this page.
Symptom: Fan does not run.
• Check for an open fuse or circuit breaker in the build-
ing's service panel.
• Check that the two (2) plug-in connections for the Motor
and the Control are seated firmly in place.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
• Check that the Blower Wheel spins freely.
Symptom: Humidity mode does not operate fan.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
Symptom: The fan runs erratically.
• Check that the Blower Wheel is firmly attached to the
Motor shaft and both spin freely.
Symptom: The fan seems noisy.
• Check that the back draft damper in the fan's Duct Con-
nector pivots freely. Screws used to attach the duct to
the Duct Connector may be preventing the damper from
opening.
• Check that the back draft damper in the wall or roof cap
pivots freely. These dampers are sometimes mistakenly
painted shut or obstructed by bird and insect debris.
XN110H Installation Guide