Installation
150-506-100-03
20
March 28, 2000
HRE-506 List 1 and List 2
O
PENING
THE
E
NCLOSURE
Opening a Gel-Filled Enclosure
You can open a gel-filled enclosure which is or is not being pressured.
To open a gel-filled HRE-506 List 1 enclosure, which is not being pressurized, perform these steps:
1
Unlock the enclosure.
2
Loosen the cover clamp and twist the stainless steel dome, then remove the cover clamp and stainless steel
dome.
To open a gel-filled HRE-506 List 1 enclosure, which is being pressurized, perform these steps:
1
Confirm that the external pressure supply is off and verify the pressure cutoff valve is in the open position,
as shown in
. If not, turn the cutoff valve counterclockwise until the pressure cutoff valve
is in the open position. This is the standard position when operating a gel-filled enclosure in a pressurized
application.
2
If you were able to turn off the external pressure supply, release the remaining pressure within the enclosure
by depressing the center pin of the air stem. Unlock the enclosure. Loosen cover clamp and twist the stainless
steel dome slightly to break the seal.
3
If you were unable to turn off the external pressure supply, locate the pressure cutoff valve as shown in
. Close the pressure cutoff valve by rotating the valve clockwise one full turn. This blocks
the pressure from the external source.
Unlock the enclosure. Gently push the dome cover back and forth while loosening the cover clamp until the
seal is broken and the pressure is released. The seal should break well before the cover clamp is loosened
enough to allow the cover to separate from the enclosure.
4
Remove the cover clamp and the stainless steel dome from the enclosure.
When handling the HRE-506 enclosure, always assume it is pressurized. Failure to relieve the
pressure before removing its cover may result in serious personal injury.
Exercise care when removing and handling the stainless steel dome. A damaged stainless steel
dome may not seal properly.
