Removal of the Essential Transformers

TASK 33-14-51-000-001-A
Removal of the Essential Transformers

FIN: 31LP
FIN: 35LP

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
Essential Transformer

3. Job Set-up
Subtask 33-14-51-865-050-A

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06
** ON A/C NOT FOR ALL
FOR FIN: 31LP (XFMRESS)
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H03
** ON A/C NOT FOR ALL
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H01
** ON A/C NOT FOR ALL
FOR FIN: 35LP (XFMRESS)
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H03
** ON A/C NOT FOR ALL
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H01
** ON A/C ALL
122VU	LIGHTING/ANN LT SPLY/XFMR/STAT INV	28LP	X03

Subtask 33-14-51-010-050-A

B. Get Access
(1) Remove the ceiling panel 211HC with an ALLEN wrench.

4. Procedure
Subtask 33-14-51-020-050-A

A. Removal of the Essential Transformer
(1) Disconnect the movable connector (4) from the defective transformer (1). Put a CAP - BLANKING on the disconnected connector.
(2) Loosen the four screws (3) and the washers (2) that attach the defective transformer (1) to the structure.
(3) Remove the defective transformer (1).

[Rev.10 from 2021] 2026.04.01 00:53:05 UTC