Features And Components
Basic Operation
The water heaters covered in this manual have a helical coil shaped heat exchanger that is submerged in the storage tank. The water heater’s Main Burner is a radial design burner, it is mounted on the top and fires downward through the heat exchanger. This is a forced draft burner; hot burning gases are forced through the heat exchanger under pressure and exit through the exhaust/vent connection located at the bottom of the water heater. See Figure 1 and Figure 2.
BLOWER |
BURNER |
ASSEMBLY |
INTAKE AIR |
(combustion air) |
CONNECTION |
4 INCH PVC |
MAIN |
BURNER |
(radial design) |
HEAT |
EXCHANGER |
HELICAL |
COIL |
VENT (exhaust) |
OUTLET |
Figure 1
Blower/Burner Assembly Detail
INTAKE AIR | COMBUSTION |
(combustion air) | BLOWER |
CONNECTION |
|
4 INCH PVC |
|
BLOWER |
|
FLANGE |
|
FLAME |
|
SENSOR |
|
MAIN |
|
BURNER |
|
(radial design) |
|
HOT SURFACE |
|
IGNITER |
|
Figure 2
Hot Surface Igniter
The control system energizes the Hot Surface Igniter with 120 VAC during the igniter warm up period. When the igniter is energized it produces sufficient heat, >1800°F (>982°C), to ignite the Main Burner.
Note: Care must be taken when handling the igniter to prevent breakage.
During the igniter warm up period prior to ignition the control system monitors the igniter current and must sense a minimum of 2.0 AC amps. See the Sequence Of Operation on page 7.
Flame Sensor
The control system also monitors the flame sensor to confirm a flame is present at the Main Burner. If a flame is not verified during the ignition trial period
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