Rothenbuhler Engineering Company Inc 1669-21 用户手册

1669-R RFD OPERATOR MANUAL REV. PP1 

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2.11. VENT 

OPERATION. 

2.11.1. 

Figure 2-11.  The Controller Unit and Remote Unit vents are manual and 

relieve internal pressure due to heat and altitude.  When the vent is closed, it will not 
leak in 100 feet of water or up to 30,000 feet in altitude.  

Unequal air pressure inside the Controller Unit may affect the operation 

of membrane switch keypad.  Extreme pressure differentials may irreversibly damage 
the keypad and/or cases. 

Vents in all units should be momentarily opened and closed immediately 

before use. 

Do not open a vent if there is water on or near the vent.  Take necessary 

precautions to ensure water does not enter the vent. 

 

Figure 2-11 Vent Operation.