Operation; Cleaning And Maintenance - Broan Ultra ZB110H 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

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.)
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 time delay mode.
(See below.)
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. (See below.)
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 time
delay mode. (See next.)
Time Delay:
Fan operates at certified airflow rate until user-adjustable
TIME delay has passed, then fan reverts to user-adjustable
airflow rate.
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 arrow points to the desired minutes
of time delay.
* 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

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.
ZB110H Installation Guide