Installation
150-454-111-06
18
February 25, 2000
HRE-454
O
PENING
THE
HRE-454 E
NCLOSURE
To open the HRE-454, do the following:
1
To open a gel-filled List 1A, List 1B, List 3, or List 5 enclosure, which is not being pressurized, go to
Step 7. To open a gel-filled List 1A, List 1B, List 3, or List 5 enclosure, which is being pressurized, go to
Step 3.
2
To open an air filled List 2A, List 2B, List 3, or List 5 enclosure, go to Step 5. Steps 3 and 4 relate to the
pressurized List 1A, List 1B, List 3, and List 5 enclosures.
3
Turn off the external pressure supply, if possible. Locate the pressure cutoff valve as shown in
. If the external pressure supply is off verify that the pressure cutoff valve is in the open position
(rotated counterclockwise), which is the normal position when operating a gel filled enclosure in a pressurized
application. If you were able to turn the external pressure supply off go to Step 6. If you were unable to turn
the external pressure supply off close the pressure cutoff valve by rotating clockwise one (1) full turn,
blocking the pressure from the external source. Go to step 4.
4
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. Go to step 9.
5
Locate the pressure cutoff valve as shown in figure 3 on page 6. Close the pressure cutoff valve by rotating
clockwise one (1) full turn, blocking the pressure from the main cable.
6
Depress the center pin of the air stem to release the remaining pressure within the enclosure.
7
Unlock the enclosure.
8
Loosen cover clamp and twist the stainless steel dome slightly to break seal.
9
Remove the cover clamp.
10
Remove the stainless steel dome from the enclosure.
C
LOSING
THE
HRE-454 E
NCLOSURE
To close the HRE-454 enclosure, do the following:
1
Inspect the enclosure cover for dirt, moisture, or mechanical damage especially around the baseplate flange
and O-ring. Remove any accumulation of dirt or moisture from the cover and replace any damaged
components.
2
Inspect the baseplate for dirt, moisture, or mechanical damage especially around the baseplate flange.
Remove any accumulation of dirt or moisture from the baseplate.
3
Remove the two desiccant bags from the plastic storage bag and place them in the enclosure.
4
Fasten the slot retainer bracket in place.
When handling any enclosures, always assume they are pressurized. Failure to relieve the
pressure before removing the cover could result in serious personal injury.
Exercise care when removing and handling the stainless steel dome. A damaged stainless steel
dome may not seal properly when replaced.
