TM 10-4510-206-14
TO 40P1-6-2-1
5 - 7.
REPAIR PROCEDURES (CONT'D)
m. UV Scanner and Flame Safeguard Control Test and Repair (Cont'd).
4. Open water heater control box lid (1) and check motor contactors
( 2 ).
I f c o n t a c t o r s a r e t r i p p e d ,
t r y r e s e t t i n g c o n t a c t o r s a nd
c h e c k f o r n o r m a l o p e r a t i o n.
I f c o n t a c t o r s c o n t i n u e t o t r i p , t e st
motor contactor operation (paragraph 5-6.m step 7).
If contactors
a r e n o t t r i p p e d , g o t o n e x t s t e p.
5.
L o o s e n s c r e w ( 3 ) h o l d i n g c o v e r
( 4 ) o n f l a m e s a f e g u a r d c o n t r o l .
Remove cover exposing circuit card .
On Model PBU-100,
serial number PBU100442 and subsequent
C h a n g e 7 5 - 59
