A.O. Smith 120 trough 500 - Manual (Page 19)

BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
18
BTR ELECTRICAL SEQUENCE OF OPERATION
M o to r O p e n s
D a m p e r
P o w e r to D a m p e r
# 2 In te rru p te d
S e rie s 1 1 0 a n d 1 1 1
E ffika l
S e rie s 1 1 0 a n d 1 1 1
E ffika l
IID M o d u le
(2 4 V ) R e c e ive s V o lta g e
M o d u le (P V ) T em in a l
S e n d s 2 4 V to P ilo t C o il
M o d u le (S p a rk ) S e n d s
1 0 ,0 0 0 V S p a rk to P ilo t
S p a rk S to p s
D a m p e r M o to r E n e rg ize d
a n d D a m p e r C lo s e d
P o w e r to D a m p e r
R e la y (4 ) In te ru p te d
Th e m o s ta t O p en s
M a in B u rn er H ea ts Ta n k
M o d u le (M V )
Te rm in a l S e n d s 2 4 V
To M a in G a s C o il
9 0 S e c o n d Tria l /
5 M in u te D e la y B e tw e e n
Tria ls - C o n tin u o u sly
P ilo t Ig n ite s a n d P ro ve s F la m e
C a m O n D a m p e r B la d e
C lo s e s P ro vin g E n d S w itc h
D a m p e r S p rin g O p en s
D a m p e r B la d e
M o to r R e la y In te rru p ts
P o w e r to M o to r
Th e rm o s ta t C lo s e d
H ig h L im it C lo s ed
Ta n k Te m p e ra tu re
M o to r C lo s e s
D a m p e r
H ig h L im it (E C O )
C los e d
Ta n k Te m p e ra tu re
S a tisfie d
2 4 V Tra n s fo rm er
O n / O F F S w itch "O N "
1 2 0 V a c to J u n c tio n B o x