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Component Locations
BLOWER
OPERATING
CENTER
HEAT EXCHANGE
ASSEMBLY
FRONT OF
HEATER
BURNER FLAME
VIEWING PORT
Figure 1.
Component Locations – Side
LOW
VOLTAGE
SWITCH
F10211
Figure 2.
Component Locations – Front
GAS TRAIN
F10210
HIGH
VOLTAGE
SWITCH
LOW VOLTAGE
ELECTRICAL
CONNECTIONS
GAS SUPPLY
CONNECTION
WATER
OUTLET
F10212
Figure 3.
Component Locations – Rear
BURNER
F10213
Figure 4.
Component Locations – Top
Input
Water
Model
MBTUH (Kwh)
Conn.
No.
(NPT)
Max.
Min.
503A
500 (147)
70
753A
750 (220)
105
1003A
999 (294)
140
1253A
1250 (368)
175
1503A
1500 (441)
210
1753A
1750 (515)
245
2003A
1999 (588)
280
Table B.
COMBUSTION
AIR INLET
HIGH VOLTAGE
ELECTRICAL
CONNECTIONS
PRESSURE
RELIEF
VALVE
WATER INLET
FLUE OUTLET
FLAME
SENSOR
IGNITER
FRONT OF HEATER
Gas
Vent Size
Conn.
in. (mm)
(NPT)
N
P
Flue
2
1
1
6 (152)
2
1
1
6 (152)
2-1/2
1-1/4
1
6 (152)
2-1/2
1-1/4
1
8 (203)
2-1/2
1-1/4
1
8 (203)
2-1/2
2
1
8 (203)
2-1/2
2
1
8 (203)
Basic Data
Intake
6 (152)
6 (152)
6 (152)
8 (203)
8 (203)
8 (203)
8 (203)
7
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