Cleaning And Maintenance; Troubleshooting - Broan ZB80ML Installation Manual

Page 13

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 on previous
page) before motor plug is removed or inserted into control
assembly.
To Clean
For quiet and efficient operation, long life and attractive ap-
pearance, 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

Before continuing, turn off power as previously noted in
WARNING on previous page and CAUTION section on this
page.
Symptom: Fan does not run.
• Check for an open fuse or circuit breaker in building's
• Check two (2) plug-in connections for Motor and its
• Check two (2) plug-in connections for Sensor and its
• 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
Symptom: Fan runs erratically.
• Check that Blower Wheel is firmly attached to Motor shaft
Symptom: Fan seems noisy.
• Check that back draft damper in fan's Duct Connector
M.O.L.
3.9" (100 mm)
• Check that back draft damper in wall or roof cap pivots
Symptom: Fan does not properly ventilate room.
• For spot ventilation, turn both master switch and sensor/
• For spot ventilation followed by continuous ventilation,
• For continuous ventilation, increase "CFM" setting of user-
ZB80ML n ZB110ML Installation Guide
service panel.
Control are seated firmly in place.
Control are seated firmly in place.
Control are seated firmly in place.
and both spin freely.
pivots freely. Screws used to attach duct to Duct Connector
may prevent damper from opening.
freely. Dampers are sometimes mistakenly painted shut or
obstructed by bird or insect debris.
control wall switch ON, so sensor/control operates fan at
certified airflow rate.
increase the "TIME" setting of user-adjustable time delay.
adjustable airflow rate.