Air Curtain FAQ & Troubleshooting Guide

FAQ

Operation & Performance

Should The Customer Use A Thermal Overload Protection Switch In The Electrical Circuit?

Not necessarily. All motors used in Mars Air Curtains are equipped with an automatic thermal overload switch in the windings of the motor for protection against burnout. If, for any reason, the motor is overheating, the motor will automatically stop.
Possible causes for overheating are:

  1. Voltage or Phase:
    • Wrong voltage being fed to the motor.
    • Too low a voltage.
    • Phases unbalanced in three phase motors.
  2. Excessive vibration in fans caused by debris caught in the vanes.
  3. Motor dirty- Air cannot get to motor housing for proper cooling.
  4. Wiring hookup not properly followed, or the wire is too light a gauge from electrical panel to air curtain.
Are Variable Speed Motors Required On Air Curtains?

The ability to adjust the outlet airflow is highly desirable; this significantly aids in the air curtain’s performance by allowing compensation for varying field conditions. Most Mars Air Curtains boast this feature provided through the adjustable air intake louver. Some models feature variable or multi-fixed speed motors while others include internal volume dampers in the air curtain’s discharge nozzle or a combination of the above. NSF certified models do not have any variable speed options. Please note, due to NSF regulations consult factory for specific model offerings.

If A Warehouse Or Commercial Building Is Heated, What Are The Advantages Of Installing An Air Curtain?

Heat rises and tends to stratify. The air curtain will cause the air to circulate, eliminating the stratification; this helps to reduce heating costs. The directing of a space heater toward the air curtain intake, if practical, will assist this action and minimize any cold drafts by bringing the warm air down to floor level with sufficient velocity and at the same time will prevent cold air from entering the building, thus saving on energy bills.

If A Warehouse Or Commercial Building Is Heated, What Are The Advantages Of Installing An Air Curtain?

Heat rises and tends to stratify. The air curtain will cause the air to circulate, eliminating the stratification; this helps to reduce heating costs. The directing of a space heater toward the air curtain intake, if practical, will assist this action and minimize any cold drafts by bringing the warm air down to floor level with sufficient velocity and at the same time will prevent cold air from entering the building, thus saving on energy bills.

Can Air Curtains Be Used To Hold In Extreme Heat Inside Industrial Conveyor Ovens?

Yes, as long as the air curtain is mounted on the outside of the oven and operating temperature does not exceed 120° F. The smaller the opening, the more effective the installation as the percent of heat loss is held to a minimum.

Can A Mars Air Curtain Be Over A Blast Freezer?

Yes, use the same models as you would over a regular freezer.

How Far Beyond The Edge Of The Housing Does The Air Spread And What Is The Depth?

The air leaves the discharge nozzle at very high velocities. The air spread and depth of "air wall" created varies between models. A general rule of thumb is: for units with 1HP motor(s) or less, the air spread is up to 3” and the depth of the wall of air created is about 18”, measured 6’ from the nozzle. For units with motor(s) larger than 1HP, the air spread is up to 6” and the depth of the wall of air is about 24”, measured 6’ from the nozzle.

What Type Of Maintenance Does The Mars Air Curtain Require?

All motors have lifetime lubricated sealed ball bearings, making greasing or oiling unnecessary. Blowing or wiping dust off the fans and motors whenever it is visible is advisable to ensure maximum performance.

Do Mars Air Curtains Meet Osha Requirements?

The sound level produced by all Mars Air Curtains is below what OSHA considers harmful, making approval unnecessary.

How Far Beyond The Edge Of The Housing Does The Air Spread And What Is The Depth?

The air leaves the discharge nozzle at very high velocities. The air spread and depth of "air wall" created varies between models. A general rule of thumb is: for units with 1HP motor(s) or less, the air spread is up to 3” and the depth of the wall of air created is about 18”, measured 6’ from the nozzle. For units with motor(s) larger than 1HP, the air spread is up to 6” and the depth of the wall of air is about 24”, measured 6’ from the nozzle.

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