Indoor Storage (Up to 5 Years)

NOTE

Rodents and other animals in search of warm surroundings or food, like to house inside motors. Some of them attack the insulation materials. Their access to the motor should be prevented.

Wholly Controlled Atmosphere

Requirements

Uniform temperature between 40°F (4.5°C) and 140°F (60°C) throughout the room maintained at least 10°F (5.5°C) above the dew point. Relative humidity of 50% or less. Dust accumulation should be minimal with no harmful fumes and no ambient vibration.

Partially Controlled Atmosphere

Requirements

The room selected should be as clean and dry as possible with no ambient vibration.

If the ambient temperature exceeds 140 °F (60°C), the space or structure should be enclosed but ventilated. If the ambient temperature is below 40 °F (4.5 °C), the space heaters, if the motor is so equipped, should be energized. The enclosing structure should be designed to protect the motor from flying debris or other damage from high winds.

If the motor can be moved, it is suggested that the entire motor be encased in a strong, transparent plastic bag. Before sealing the bag, a moisture indicator should be attached to the side of the motor and several bags of silica gel desiccant placed inside the bag around the motor. When the moisture indicator shows that the desiccant has lost its effectiveness, as by a change in color, the bag should be opened and the desiccant replaced with fresh material. Take care in placing the bags of desiccant so that none is in contact with the heater element.

When a motor cannot be sealed for effective use of a desiccant, and the relative humidity is greater than 50% or where there are large daily swings in temperature, proper storage requires that the space heaters (anti- condensation heaters) be energized. Heaters supplied in the motor are sized to raise the windings temperature 10°F to 15°F (5.5°C to 8°C). This prevents moisture from condensing on the windings. If the motors are not equipped with space heaters, consult the factory for proper size of external heaters to be used.

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