XX163-11-00 Rev 1006 SVFT-PRS Pressurized Dome Housing
Installation
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20. Attach the housing’s safety clip to the camera drive’s tab. Tilt the camera drive down and orient the two
(2) slots on the housing with the two (2) tabs on the drive and raise it until two distinct clicks are heard.
The housing is now securely installed.
21. Verify that the O-ring in the groove of the trim ring assembly is properly seated, free of debris and has a
light coat of vacuum grease. If not, seat the O-ring in the groove, remove any debris and rub additional
vacuum grease on it.
22. Attach the trim ring lanyard to the trim ring assembly and mate it to the housing by aligning the housing
holes with the trim ring/lower dome holes. Install the eight (8) screws and tighten only with a torque
wrench set for 15-in. lb (170-N cm) of force. Use an alternating (star) pattern to tighten all the screws.
Pressurizing the Housing Assembly
23. Reattach the previously removed service cover to the service opening using the four (4) captive screws.
24. Using a regulated source of dry Nitrogen gas with the proper Schraeder type fill fitting, as shown in Figure
5, regulate the gas pressure to 10.0 psi (0.68 atm or bars).
25. Attach the fill fitting to the housing assembly’s fill valve located at the lower side of the housing and
pressurize the housing assembly. When the relief valve opens (gas will hiss from the top of the relief
valve), allow this to purge for a minimum of 5 minutes to assure that all the enclosed air is replaced by
nitrogen; then remove the fill fitting. The relief valve is rated at 5 psi (0.34 atm or bars). Monitor the actual
pressure for the next hour. If, in one hour the pressure has not dropped below 4.5 psi (0.31 atm or bars),
it is assumed that the housing assembly is sealed and the relief valve is seating properly.
26. Reinstall the cap on the fill valve.
Caution: Pressurizing the housing assembly beyond 10 psi , or with an unregulated gas source, can
cause severe injury to personnel and permanent damage to the assembly.
Warning: If the dome has been dropped and is cracked, do not pressurize. Replace it with a new dome.
Note: The housing with mechanism has approximately 490 in.
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of volume.
Note: The pressurized function has not been evaluated by UL.
Warning: Do not use any gas type other than dry Nitrogen. The use of Shop Air can introduce moisture
into the housing assembly that can damage it over time.
Summary of Contents for SVFT-PRS22E
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