150-712-200-02
Appendix A - Technical Reference
HRE-712 List 1 and List 2
July 26, 2000
33
R
EPLACEMENT
P
ARTS
The HRE-712 contains LPU surge arrestors that can be replaced in the field if needed. Additionally, ADC
recommends that the O-ring be closely examined whenever the housing is opened for maintenance. Replace the
O-ring, if damaged.
When replacing the stainless steel dome cover, it is necessary to replace the metal locking clamp and O-ring. It is
recommended that the desiccant bags be replaced when the enclosure is opened. Use Davison Chemical Corp.
Proteck-Sorb-121 or equivalent desiccant.
To replace LPU arrestor boards:
1
Clean the dome cover and clamp of dust and debris.
2
Remove the clamp and dome cover.
3
Remove the defective LPU board.
4
Insert a new LPU board in the vacant position.
5
Replace other defective LPU boards in the same manner.
6
Replace O-ring, if damaged.
7
Replace cover and clamp and repressurize housing if required per
“Detaching the Enclosure from the
The cover, clamp, O-ring, and LPU surge arrestors can be replaced in the field if they become
damaged.
lists replacement part numbers.
If an enclosure plug receives severe lightning stress, ADC recommends replacing the LPU
board for that plug.
The LPU board must be reattached so that pin 1 of the LPU board is connected to the edge
connector pin attached to the green ground wire. If pin 1 is attached in any other way,
protection will not be provided.
