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to connect electrical conduit. Connect all supply and control
circuit wires according to the wiring diagram.
E. Reinstall the wiring compartment cover.
F. Switch on the power at the service disconnect. Turn on the
unit and check the sequence of operation against the wiring
diagram.
G. Proceed to Section VI-AIRFLOW ADJUSTMENTS.
VI. AIRFLOW ADJUSTMENTS
A. AIR STREAM SPLIT ADJUSTMENT
1. With the air door operating and the door in its full open
position, check to see that nothing is obstructing the air
flow at the discharge nozzle vanes.
2. Find the air stream split location. Hold a handkerchief, by
its corners, approximately 12" above the floor. Gently move
the handkerchief back and forth in the doorway. Make sure
the air is being directed to both the inside and the outside.
The split location is indicated where the handkerchief is
vertical with minimal or no fluttering. See FIGURE 7.
3. Adjust the discharge nozzle vanes so the split location is
approximately 3" outside the doorway. This is accomplished
by first de-energizing the unit. Remove the cover hous-
ing, loosen the nozzle vane locking screws and adjusting
vanes.
B. LOW SPEED ADJUSTMENT
NOTE: This Section is applicable to units with a factory sup-
plied speed controller only. A speed control device shall
not be used on units required to comply with EPH or NSF
Standard 37.
NOTE: Variable speed controller is not factory set for low
speed setting. If low speed setting is desired it must be
done after installation.
WARNING: Changing the low speed setting too much can
cause the motor to stall on low speed.
FIGURE 7 - Air Flow Adjustment
FIGURE 6 - Junction Box
1. Turn the speed controller knob clockwise to low speed.
2. Insert a small phillips screwdriver in the hole located next
to the speed control knob and slowly turn adjusting screw
clockwise to lower the speed. A small degree of rotation
is required to change speed. Wait for speed to settle after
each turn.
VII. MAINTENANCE AND CLEANING
CAUTION: ELECTRIC SHOCK HAZARD Disconnect power
whenever servicing unit. More than one disconnect may
be required to de-energize unit.
Keep your air door operating at peak efficiency by cleaning
the blower wheels, motor(s) and intake grille. Buildup of dust
on the blower wheels can cause vibration, noise and excessive
wear on the motor bearings. The frequency of cleaning will
depend on the environment where the unit is operating.
Dirty, dusty or greasy environments could require a cleaning
schedule of once every two months. If the environment is
not that dirty, the unit(s) should be scheduled for cleaning a
minimum of once every (6) months. To access the interior of
the unit:
A. Disconnect the power to the unit.
B. Remove the intake grille by removing all phillips head screws
around edge. See FIGURE 6
C. Vacuum and scrape (if necessary) to remove the buildup of
dirt and debris. The motor(s) are permanently lubricated and
require no additional lubrication. Reinstall the cover and intake
grille.
D. Switch the power on after cleaning. CAUTION: STAND CLEAR
OF THE UNIT OR WEAR SAFETY GOGGLES AS LOOSE DEBRIS
MAY BE PRESENT AND MAY EXIT THE NOZZLE.
VIII. SERVICE
CAUTION: ELECTRIC SHOCK HAZARD Disconnect power
whenever servicing unit. More than one disconnect may
be required to de-energize unit.
Any service performed on the EZN/KZN Series air door MUST be
done by qualified personnel.
-4-
.
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