Install Instructions

5
CAUTION
The appliance is not to be used by persons (including
children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction.
Children are not to play with the appliance.
PROBLEM CAUSE SOLUTION
NO AIR BLOWING OUT
OF DISCHARGE NOZZLE
- No power being supplied to the unit from
the electrical power source
- Confirm power source / check if in on position
- Circuit breaker is tripped - Reset circuit breaker
- Blown fuses on power supply - Replace fuses
- Motor overload is open or tripped
- Allow the motor to cool down; motor has auto reset internal
overload; if unit is panel equipped, press reset button on
overload inside panel, or replace motor overload if overload
remains tripped
- Motor contactor / relay defective
(if applicable)
- Check voltage to coil; check contacts to see if they are pulling in
- Failed switch - Replace or repair limit switch
MOTOR IS RUNNING BUT
FANS ARE NOT
SPINNING
- Loose or broken coupling (belt drive) - Replace or tighten coupling
- Loose set screws on wheel hubs - Tighten set screws on motor shaft flats
- Fan spinning inside fan housing - Tighten fan on shaft or replace fan
- Broken fan hub - Replace fan wheels
ELECTRICAL CONTROLS
NOT WORKING WHEN
DOOR IS OPEN
- Switch is in off position - Turn unit's switch to the on position
- Door limit switch is not operating - Repair or replace door limit switch
UNIT WILL NOT TURN
OFF
- Door limit switch is permanently closed or
energized
- Position the door switch in a manner that turns off the unit when
the door closes, and turns on the unit when the door opens.
Only light pressure required.
LOW AIR FLOW - Discharge air vanes out of adjustment
- Adjust vanes to proper position (Refer to Start-
Up Section in this manual)
- Obstruction on intake or discharge - Remove obstruction or move air curtain
- Power leads out of polarity
- Switch power leads to correct polarity
(3 phase models only)
- Blower motor rotating below normal speed
- Apply proper voltage per unit requirement (see unit
label) / Adjust adjustable motor speed knob (if applicable)
- Fan rubbing against housing - Free fan from housing
- Blower wheels clogged with dirt - Clean and remove dirt from blower wheels
EXCESSIVE AIR
VELOCITY AT DOOR
OPENING
- Nozzle out of adjustment and not angled far
out enough (BD only)
- Adjust nozzle angle to outside
- Air temperature too cold - Add auxiliary heat to overcome wind chill
- Air stream pushing air outside of the building - Adjust discharge angle back into building
AIR NOT HITTING THE
FLOOR
- Low air velocity
- Adjust vanes to proper position or check installation height
(Refer to Start-Up Section in this manual)
- Obstruction in the direction of air flow
- Remove obstruction or move air curtain
(Move out 3/8" for every 1" up from the door)
- Negative building pressure
- Provide a make-up air system to relieve negative building
pressure
UNEVEN AIR - Shaft rotating inside fan - Replace fan or tighten fan on shaft
- One motor not functioning - Replace or repair motor
EXCESSIVE NOISE AND
OR VIBRATION
- Loose or broken coupling (belt drive) - Replace or tighten coupling
- Loose set screws on wheel hubs - Tighten set screws on motor shaft flats
- Fan spinning inside fan housing - Tighten fan on shaft or replace fan
- Broken fan hub - Replace fan wheels
- Bearing end caps worn - Replace Bearing end caps
- Damaged blower wheel - Replace Blower Wheel
- Bearing end caps worn - Replace Bearing end caps
- Balancing clips missing - Replace Blower Wheel
TROUBLESHOOTING
DISCLAIMER
Mars reserves the right to change specifications and
product design without notice. Such revisions do not
entitle the buyer to corresponding changes,
improvements, additions or replacements for
previously purchased equipment.