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FIGURE 7 - Air Flow Adjustment
VIII. MAINTENANCE AND CLEANING
CAUTION: ELECTRIC SHOCK HAZARD
Disconnect power whenever servicing unit. More than one discon-
nect 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. Otherwise, the unit(s) should be scheduled for
cleaning a minimum of once every (6) months. To access the interior of
the unit:
A. Disconnect and lockout power to the unit. Remove unit cover hous-
ing by removing screws from the top and bottom of unit. Slide cover
housing away from blower assembly to remove. If the unit has a filter,
it should be removed and cleaned at this time. The filter is located
in the cover housing and held in place by wing nuts and clips. See
Figure 8.
B. Vacuum and scrape (if necessary) to remove the buildup of dirt and
debris from the interior of the Air Door. The motor(s) are permanent-
ly lubricated and require no additional lubrication. Reinstall the cover
housing.
C. 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.
FIGURE 8 - Filter Replacement
IX. 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 Aristocrat/Star Series Air Door MUST be done
by qualified personnel.
Berner Air Doors require very little servicing. All parts are easily acces-
sible for periodic inspection and maintenance. Units should be cleaned
at least twice a year. Your particular application (the amount of dirt and
dust in the air) and location of the unit(s) will determine how often your
unit(s) will need to be cleaned and serviced. All motors have permanent-
ly lubricated, sealed, sleeve bearings and require no maintenance.
A. Fan Wheel Removal - Ambient and Electric Heated
1. Disconnect and lockout power to the unit. Remove unit cover hous-
ing by removing screws from the top and bottom of unit. Slide cover
housing away from blower assembly to remove.
2. If unit is equipped with inlet rings and/or tri-arm bearings, remove
outside ring and/or bearing using a blade screw driver or ¼" nut
driver. If unit does not have inlet rings proceed to next step.
3. Loosen (do not remove) ⁵ / ₃₂ " Allen head set screw from hub of fan
wheel. Note: a T-handle Allen wrench may be inserted through hole
in fan housing and fan blade with semi-circle notch.
4. Carefully slide fan wheel out of fan housing.
5. Reinstall fan wheel and align set screw with flat on motor shaft.
6. Slowly tighten set screw while gently rocking fan wheel back and
forth to settle set screw perpendicular to motor shaft flat.
7. Reinstall inlet ring and/or bearing if necessary.
8. Reinstall unit cover housing and switch on power.
B. Motor Removal - Ambient and Electric Heated
1. Disconnect and lockout power to the unit. Remove unit cover hous-
ing by removing screws from the top and bottom of unit. Slide cover
housing away from blower assembly to remove. For electric heated
units, mark connections and disconnect four spade wire terminals
from electric heater(s).
2. Unplug wiring harness from motor.
3. Loosen (do not remove) ⁵ / ₃₂ " Allen head set screw from hub of each
fan wheel attached to motor. Note: a T-handle Allen wrench may
be inserted through hole in fan housing and fan blade with semi-
circle notch. If unit is equipped with an extended shaft and coupling
for a three fan, one motor construction, this fan assembly must be
disconnected from motor shaft. Loosen ⁵ / ₃₂ " set screw on third fan
wheel hub. Loosen set screw on motor shaft side of coupling (silver
coupling - ⁵ / ₃₂ " Allen wrench, black coupling - 9/64" Allen wrench).
Slide coupling and shaft off motor shaft by gently pushing it through
third fan hub.
4. Remove four phillips head screws from each fan housing that has a fan
attached to motor.
5. Remove each fan and housing assembly from motor shaft by sliding
away from motor. After fan wheel is off motor shaft, remove assembly
by rotating it away from the blower assembly.
5
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