Berner AED08, Installation & Maintenance Instructions Manual

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SYMPTOMS CAUSE REMEDY
NO AIR • Power supply line open (no power) • Check power source, check method of control
position in ON
• Fuse blown/circuit breaker tripped • Replace fuse(s)/reset breaker
• Motor overload tripped • Internally protected motor - should reset automatically
after cool-down, if not replace motor.
• Failed switch • Replace switch
MOTOR RUNNING/FANS ARE NOT ROTATING
• Broken or flexible hub • Replace fan sleeve/reengage coupling
• Shaft rotating inside fan • Tighten set screws/tighten fan on shaft
• Belt driven units/belt broken • Replace belts
ELECTRICAL CONTROLS NOT FUNCTIONING WHEN DOOR IS OPEN
• Selector switch is in off position • Turn switch to “ON” position
• Door limit switch not operating • Repair or replace limit switch
MINIMUM AIR
• Air directional discharge vanes misadjusted • Adjust vanes to proper position, see instructions
• Inadequate intake clearance • Move air curtain or remove obstruction
• Provide adequate space for air curtain
• Blower motor operates below speed • Improve voltage
• Fan rubbing against housing • Free fan from housing
• Fan wheels clogged with dirt • Clean and vacuum fan wheels
AIR IS NOT HITTING
• Air stream to weak • Adjust nozzle to proper position, adjust motor speed;
FLOOR see installation instructions
• Air stream hits obstruction • Remove obstruction or reposition air curtain (move out
3
/
8
” for every 1” up from the door)
• Negative pressure • Relieve negative pressure by providing make-up air
UNEVEN AIR
• Shaft rotating inside fan • Tighten set screws
• One motor not operating • Repair or replace motor
EXCESSIVE AIR
• Nozzle not angled out far enough • Adjust nozzle angle to outside
MOVEMENT AT
• Unit too powerful • Adjust motor speed
DOORWAY
• Air movement too cold • Add auxiliary heat to overcome wind chill factor
• Pushing air outside building • Adjust discharge angle back into building, adjust motor
speed
SEE AIR IS NOT HITTING FLOOR SYMPTOMS
ELECTRICALLY HEATED MODELS
NO HEAT
• Switch turned to “ON” position • Replace switch or check wiring
• Thermostat not set properly • Change thermostat setting
• Coils burned out due to lack of air • Correct airflow problem; replace coils
• Automatic reset thermal cutout failed in open position • Replace automatic thermal cutout
• Manual reset thermal cutout tripped • Reset manual thermal cutout
MINIMAL HEAT
• Low entering air temperature • Based on unit temperature rise, reduce speed
• Thermostat in wrong location - thermostat too • Move thermostat away from air stream
close to discharge
• Improper voltage • Supply proper voltage
• Thermostat not set properly • Change temperature setting
EXCESSIVE HEAT
• Thermostat in wrong location • Move thermostat closer to air stream
• Thermostat not set properly • change temperature setting
• Insufficient air over coil • Remove restriction on intake
X. TROUBLESHOOTING