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TM 5-4120-374-13
1. Make sure you perform the preventive maintenance checks and services (para. 2-2).
2. Turn thermostat counterclockwise to non-cooling position.
3. Place selector switch in the FAN position to start fans.
4. Close RETURN AIR control.
5. Adjust damper control chain for desired amount of fresh air.
Turn FAN selector switch to OFF position.
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