A.O. Smith 520 Direct Vent Indoor, Service Manual

Page: 9 / 97

520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
9
CONFIDENTIAL
No. Description
Item# in
components
diagram
AOS Part #
Common parts
For other models
21 Outlet drain plug 416 319143-079 710
22 AFR rod 106 319143-035 310, 510, 910, 710
23 Flame rod 106 319143-035 310, 510, 910, 710
24 Igniter rod 108 319143-037 310, 510, 910, 710
25 Surge box 715 319143-140
26 Heater 101 405 319143-068 910, 710
27 Outlet heater 415 319143-078 110, 310, 510, 710
28
Over heat cut off fuse
for combustion chamber
008 319143-016 710
29
Secondary heat
exchanger
drain plug
458 319143-120
30 Fan motor for exhaust 124 319143-053
31
Hi-limit switch for
exhaust
442 319143-104
32
Exhaust thermistor
assembly
706 319143-131
33
Inlet drain plug (water
filter)
409 319143-072 910, 710
34 Flat heater 453 319143-115
35 3 array heater 454 319143-116
36 Case assembly
001
319143-009
(510 Indoor)
015
319143-023
(510 Outdoor)
37 Manifold port N/A N/A
38 Gas inlet port N/A N/A