Advertisement
Berner air doors require very little servicing. All parts are eas-
ily accessible for periodic inspection and maintenance. Units
should be cleaned at least twice a year. Your particular applica-
tion (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 permanently lubricated,
sealed, sleeve bearings and require no maintenance.
A. UNIT MOUNTED ROTARY SWITCH REMOVAL
The variable speed switch must be removed from the bottom
of the unit.
1.
Disconnect power to the unit.
2.
Remove the intake grille by removing all phillips head
screws around edge. See FIGURE 6
3.
Disconnect and mark the wires in the unit connected to
the switch.
4.
Remove the knob from the switch by pulling it straight
away from the unit.
5.
Remove the two phillips head screws holding the switch
and nameplate to the unit.
6.
Remove the switch by pushing it into the unit.
7.
Reinstall in reverse order of removal.
SYMPTOMS
NO AIR
MINIMUM AIR
AIR IS NOT HITTING
FLOOR
UNEVEN AIR
EXCESSIVE AIR
MOVEMENT AT DOOR-
WAY
.
TROUBLESHOOTING
CAUSE
•
Electrical Power supply line open (no
power)
•
Fuse blown/circuit breaker tripped
•
Motor overload tripped
•
Failed switch
MOTOR RUNNING/FANS ARE NOT ROTATING
•
Broken fan hub
•
Shaft rotating inside fan
•
Broken / Loose coupling
ELECTRICAL CONTROLS NOT FUNCTIONING WHEN DOOR IS OPEN
•
Selector switch is in off position
•
Door limit switch not operating
•
Air directional discharge vanes misadjusted
•
Inadequate intake clearance
•
Blower motor operates below speed
•
Fan rubbing against housing
•
Fan wheels clogged with dirt
•
Air stream to weak
•
Air steam hits obstruction
•
Negative pressure
•
Shaft rotating inside fan
•
Nozzle not angled out far enough
•
Air movement too cold
•
Pushing air outside building
SEE AIR IS NOT HITTING FLOOR SYMPTOMS
B. FAN AND MOTOR REMOVAL
1.
Disconnect power to the unit.
2.
Remove the intake grille by removing all phillips head
screws around edge. See FIGURE 6
3.
Unplug motor harness from motor and remove necessary
wiring.
4.
Using a
/
" Allen wrench, loosen each set screw attaching
1
8
fan(s) to motor.
5.
While holding the motor in place, loosen and remove
the motor clips.
6.
Slide the fans toward the motor so that the ball bearings
on the outer fan shaft are exposed.
7.
Slowly roll the motor out of the motor mount cradle for-
ward and down. The hubs of the fans are flexible enough
to allow the motor to move before the fans' outer ball
bearings pull out of the unit.
8.
Reinstall in reverse order of removal.
•
Check power source, check method of control
in ON position
•
Replace fuse(s)/reset breaker
•
Internally protected motor - should reset auto-
matically after cool-down, if not, replace mo-
tor.
•
Replace switch
•
Replace fan
•
Tighten set screws/tighten fan on shaft
•
Replace / Tighten coupling
•
Turn switch to "ON" position
•
Repair or replace limit switch
•
Adjust vanes to proper position, see instruc-
tions
•
Move air curtain or remove obstruction
Provide adequate space for air curtain
•
Improper voltage
•
Free fan from housing
•
Clean and vacuum fan wheels
•
Adjust nozzle to proper position, adjust motor
speed; see installation instructions
•
Remove obstruction or reposition air curtain
(move out 3/8" for every 1" up from the door)
•
Relieve negative pressure by providing
makeup air
•
Tighten set screws/Replace fan
•
Adjust nozzle angle to outside
•
Add auxiliary heat to overcome wind chill
•
Adjust discharge angle back into building
-5-
.
REMEDY
Advertisement
