Operation; Cleaning And Maintenance; Troubleshooting - NuTone ZN110H Guia De Instalacion

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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

Modes
Continuous ventilation:
1. Turn master wall switch on (make sure any other wall
switches are off).
2. Fan operates at user-adjustable airflow rate.
Humidity sensing:
1. If master wall switch is not already on, turn it on.
2. Turn sensor/control wall switch on (make sure any other
wall switches are off). Some installations may not have a
separate sensor/control wall switch; where it is combined
with master wall switch.
3. Sensor monitors humidity level for (a) moderate to rapid
rise or (b) above set-point.
4. Fan operates at certified airflow rate to reduce humidity.
5. When humidity decreases, fan enters timed-off mode.
Manual-on (optional manual-on wall switch must be
installed):
1. Turn master and manual-on wall switches on (sensor/
control wall switch can be on or off).
2. Fan operates at certified airflow rate.
3. When manual-on wall switch is turned off, fan enters
timed-off mode.
Toggle (for manual operation when optional manual-on wall
switch is not installed):
1. If master wall switch is not already on, turn it on.
2. Turn sensor/control wall switch on (make sure any other
wall switches are off). Some installations may not have a
separate sensor/control wall switch; where it is combined
with master wall switch then turn master wall switch on
and off using following instructions.
3. Wait at least one-second.
4. Turn switch off for less than one-second.
5. Turn switch back on.
6. Fan will operate at certified airflow rate and enter timed-off
mode.
Timed-off:
1. Fan operates at certified airflow rate.
2. When user-adjustable time delay has passed, fan reverts
to user-adjustable airflow rate.
3. Evacuation of humidity, odors, etc. is complete.
To Set User-Adjustable Humidity Sensitivity**
Using a small, flat-blade screwdriver, carefully rotate
HUMIDITY adjustment until arrow points to desired humidity
level shown in percent relative humidity (%RH).
** User-adjustable humidity sensitivity is located in corner of
Fan Housing behind Grille.
To Set the User-Adjustable Airflow Rate*
Using a small, flat-blade screwdriver, carefully rotate the CFM
adjustment until the arrow points to the desired airflow rate.
To Set the User-Adjustable Time Delay*
Using a small, flat-blade screwdriver, carefully rotate the
TIME adjustment until the arrow points to the desired time
delay, shown in minutes.
* The user-adjustable controls are located in one corner of
the Fan Housing, behind the Grille.
To Turn Fan OFF
Turn the master switch OFF.

Cleaning and Maintenance

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

Symptom: Fan does not run.
• Check for an open fuse or circuit breaker in building's
service panel.
• Check two (2) plug-in connections for Motor and its Control
are seated firmly in place.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
• Check that Blower Wheel spins freely.
Symptom: Humidity mode does not operate fan at
certified air flow rate.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
Symptom: Fan runs erratically.
• Check that Blower Wheel is firmly attached to Motor shaft
and both spin freely.
Symptom: Fan seems noisy.
• Check that back draft damper in fan's Duct Connector
pivots freely. Screws used to attach duct to Duct Connector
may prevent damper from opening.
• Check that back draft damper in wall or roof cap pivots
freely. Dampers are sometimes mistakenly painted shut or
obstructed by bird or insect debris.
Symptom: Fan does not properly ventilate room.
• For spot ventilation, turn both master switch and sensor/
control wall switch ON, so sensor/control operates fan at
certified airflow rate.
• For spot ventilation followed by continuous ventilation,
increase the "TIME" setting of user-adjustable time delay.
• For continuous ventilation, increase "CFM" setting of user-
adjustable airflow rate.
ZN110H Installation Guide