Operation; Cleaning And Maintenance; Troubleshooting - Broan-NuTone ZB80ML 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

Modes
Continuous ventilation:
1. Turn master wall switch on.
2. Fan operates at user-adjustable airflow rate.
Motion sensing:
1. If master wall switch is not already on, turn it on.
2. Turn sensor/control wall switch on. Some installations
may not have a separate sensor/control wall switch;
where it is combined with master wall switch.
3. Fan operates at certified airflow rate and sensor de-
tects motion.
4. When no more motion is detected, fan enters timed-off
mode.
Timed-off:
1. Fan operates at certified airflow rate.
2. When user-adjustable time delay has passed, fan re-
verts to user-adjustable airflow rate.
3. Evacuation of humidity, odors, etc. is complete.
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.
ZB80ML User-adjustable controls
ZB110ML User-adjustable controls
To Turn Fan OFF
Turn the master switch OFF.
ZB80ML n ZB110ML Installation Guide

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: Motion 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.
M.O.L.
3.9" (100 mm)