User's Manual

Table Of Contents
2.11. VENT OPERATION
2.11.1. In Figure 2-14, the unit vents shown are manually operated and relieve
internal pressure due to heat and altitude. When the vent is closed, it will not leak in
100 feet of water (30 meters) or up to 30,000 feet (9,100 meters) in altitude.
CAUTION Unequal air pressure inside the Mini Controller Unit may affect the
operation of membrane switch keypad. Extreme pressure differentials may irreversibly
damage the keypad and/or cases.
CAUTION Vents in all units should be momentarily opened and closed immediately
before use.
CAUTION Do not open a vent if there is water on or near the vent. Keep the vents
closed when the relative humidity is above 90%. Take necessary precautions to ensure
moisture does not enter the unit case.
Figure 2-14 Vent Operation
1678 RFD OPERATION MANUAL {DRAFT}
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