ADC HRE-506 User Manual page 14

Overview
The common pressure supplied through the cable is approximately 9 PSI. This is sufficient to prevent water from
entering the cable or housing. ADC recommends pressurizing the enclosure to a maximum of 12 PSI.
To avoid pressure buildup, the pressure relief valve is set to release air at a maximum
pressure of 15 PSI. Due to manufacturing tolerances of the springs, this maximum
pressure has a tolerance of ± 3 PSI. This pressure and tolerance is well within the safety
concerns that may apply to the housing, personnel, or cable.
The pressure relief valve is not intended for controlling the air pressure that is being
applied to the housing cable.
Air-filled Stub Pressurization
This unit has an air pressure cutoff valve, air stem Schrader valve, and pressure relief valve. The air pressure cutoff
valve is used to shut off the inlet air supply that is pumped from the main feeder cable through the 30-foot (9.144
M) stub into the HRE-506 enclosure.
•
To shut off the inlet air supply, turn the air-cutoff valve clockwise 1 full turn.
•
To turn on the inlet air supply, turn the air-cutoff valve counterclockwise 1 full turn.
6 March 28, 2000
150-506-100-03
HRE-506 List 1 and List 2