Operation; Cleaning And Maintenance; Troubleshooting - NuTone ZB110HL Installation Manual

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

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.
To Change Bulbs
Refer to Retrofit Installation Step 14
(page 11).
1. Carefully insert a small flathead
screwdriver between the Grille and
Lens, then twist to remove Lens.
2. Purchase two (2) 18W (max.)
type GU24 fluorescent lamps with
Maximum Overall Length (MOL)
of 3.9" (100 mm). Purchase a 4W
(max.) C7-type incandescent night light bulb.
3. Insert bulbs into their sockets. Replace Lens.

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.
ZB110HL Installation Guide
M.O.L.
3.9" (100 mm)