Instructions / Assembly

ZN80
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ZN110 Installation Guide
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
To Turn Fan ON
Turn the master switch ON.
• Fanwillrunatthecertifiedairflowrateifthemode
select switch is ON.
• Fanwillrunattheuser-adjustableairflowrateifthe
mode select switch is OFF.
To Use Fan Time Delay Airflow Rate Change
1. Turn the master switch ON.
2. Turn the mode select switch ON - fan will run at the
certified airflow rate.
3. When the mode select switch is turned OFF, fan will
continue to run at the certified airflow rate until the
user-adjustabletimedelayhaselapsed,andthenwill
automaticallychangetotheuser-adjustableairflowrate.
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.
The Motor is permanently lubricated and never needs
oiling. If the motor bearings are making excessive or
unusual noises, replace the Control Assembly and Motor.
Troubleshooting
Symptom: The fan does not run.
•Checkforanopenfuseorcircuitbreakerinthe
building’s service panel.
•Checkthatthetwo(2)plug-inconnectionsfortheMotor
and the Control are seated firmly in place.
•CheckthattheBlowerWheelspinsfreely.
Symptom: The fan runs erratically.
•CheckthattheBlowerWheelisfirmlyattachedtothe
Motor shaft and both spin freely.
Symptom: The fan seems noisy.
•Checkthatthebackdraftdamperinthefan’sDuct
Connector pivots freely. Screws used to attach the duct
to the Duct Connector may be preventing the damper
from opening.
• Checkthatthebackdraftdamperinthewallorroofcap
pivots freely. These dampers are sometimes mistakenly
painted shut or obstructed by bird and insect debris.
Symptom: The fan does not properly ventilate the room.
•Forspotventilation,turnboththemasterswitchandthe
mode select switch ON to enable the fan to run at the
certified airflow rate.
•Forspotventilationfollowedbycontinuousventilation,
increasethe“TIME”settingoftheuser-adjustabletime
delay.
•Forcontinuousventilation,increasethe“CFM”settingof
theuser-adjustableairflowrate.
ZN80 User-adjustable controls
ZN110 User-adjustable controls