A.O. Smith 120 trough 500 - Manual (Page 52)

BTR TANK TYPE HEATERS
SERVICE WORKBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
51
COMPONENT PART INFORMATION
NAME SPECIFICATIONS AOS PART NUMBERS
DUAL
CONTROLLER THERMOSTAT
120-180
O
RANGE, + 4
O
, 5
O
DIFFERENTIAL,
LIQUID FILLED, ANTI-
STACKING
AOS # 192828
HIGH LIMIT
(ECO)
OPENS - 205
O
FIXED,
MANUAL
RESET BELOW 185
O
GAS VALVE NATURAL GAS BTR 120-400;24VAC, 60hz,
.6A,.7” to 3.5” W.C.,
STEP OPEN
BTR 500; 24VAC, 60hz,
Dual Gas Valve,
STEP OPEN
AOS # 192827-2
AOS # 193366-0
PROPANE
GAS
BTR 120-400;
2.5 – 10” W.C.
STEP OPEN
BTR 500; 24VAC, 60hz,
Dual Gas Valve,
STEP OPEN
AOS # 192827-3
AOS # 193366-1
INTERMITENT
IGNITION
DEVICE
CONTROL
NATURAL GAS
AND
PROPANE
GAS
24 VAC, 50-60 HZ, .1A;
.7 MICROAMP SIGNAL
CONTINUOUS RETRIAL
AOS 193325
DAMPER COMPLETE
ASSEMBLY
SEE PARTS LIST
MOTOR 24 VAC, 60 HZ, 120 RPM,
5 WATT
AOS #6521
P.C. BOARD
W/RELAY
Service Switch AOS #6522
TRANSFORMER 120 V PRIMARY, 24 VAC
SECONDARY,
40 VA, 50-60 HZ, CLASS 2
"B"
AOS #193444