State SBL95 250NE A - Manual (Page 7)

7
features and Components
Controls
figure 1.
the hydroCannon (self-Cleaning system)
These units include The Hydrocannon (Self-Cleaning System) installed
in the front water inlet, see Figure 2. The Hydrocannon inlet tube can
only be used in the front water inlet connection. Do not install the
Hydrocannon inlet tube in either the top or back inlet water connection.
The Hydrocannon must be oriented correctly for proper function. There
is a marked range on the pipe nipple portion of the Hydrocannon, that
must be aligned with the top of the inlet spud. A label above the jacket
hole has an arrow that will point to the marked portion of the pipe nipple
if the orientation is correct. If the arrow does not point within the marked
range on the pipe nipple, adjust the pipe nipple to correct. A pipe union is
supplied with the Hydrocannon to reduce the probability of misaligning
the Hydrocannon accidentally while tightening the connection to the
inlet water supply line. Improper orientation of the Hydrocannon can
cause poor performance of the heater and can significantly reduce
outlet water temperatures during heavy draws.
note: the hydrocannon may have 1, 3 or 7 cross tubes.
figure 2.
high limit switCh
The digital thermostat (Figure 3) contains the high limit (energy
cutout) switch. The high limit switch interrupts burner gas flow should
the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the water heater cannot be
restarted unless the water temperature is reduced to approximately
120°F (49°C). The high limit reset button on the front of the control
then needs to be depressed.
Continued manual resetting of high limit control, preceded by higher
than usual water temperature is evidence of high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
RESET
BUTTON
LED
LIGHTS
FUSE
140
130
digital thermostat
figure 3.
eleCtroniC ignition Control
each heater is equipped with an ignition control. The
solid state ignition control (Figure 4), ignites the burner by
utilizing a spark igniter. The spark igniter shuts off during
the heating cycle and the burner flame is sensed through a
remote flame sensor.
The ignition control will try to ignite the burner three times
before lockout. The control waits 15 minutes before trying
again to ignite the burner. This is a continuous cycle.
ignition Control
figure 4.
Blower/Burner assemBly
figure 5.
spark igniter
The ignition control energizes the Spark Igniter to ignite the burner.
intake air screen
The intake air screen is attached to the inlet end of the combustion
blower. Inspect the intake air screen every six months. The intake
air screen should be cleaned of any buildup of debris or foreign
material.
flame sensor
The control system monitors the flame sensor to confirm that flame
is present at the burner. If a flame is not verified during the ignition
trial period (4 seconds) the control system will immediately de-
energize the 24 VAC Gas Valve as indicated on the Sequence of
Operation Flow Chart (Figure 24).