7
features and Components
Controls
figure 1.
the eliminator (self-Cleaning system)
These units include The eliminator (Self-Cleaning System) installed
in the front water inlet, see Figure 2. The eliminator inlet tube can
only be used in the front water inlet connection. Do not install the
eliminator inlet tube in either the top or back inlet water connection.
The eliminator must be oriented correctly for proper function. There
is a marked range on the pipe nipple portion of the eliminator, 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 eliminator to reduce the
probability of misaligning the eliminator accidentally while tightening
the connection to the inlet water supply line. Improper orientation of
the eliminator can cause poor performance of the heater and can
significantly reduce outlet water temperatures during heavy draws.
note: the eliminator 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 an
intermittent spark-to-pilot igniter. Spark and pilot gas On until
lightoff or trial for ignition ends. If pilot fails to light, pilot gas and
spark OFF (100% shutoff). After 5 minutes delay, a new trial for
ignition is initiated. This sequence continues until lightoff or "Call
for Heat" is removed.
ignition Control
figure 4.
Blower/Burner assemBly
The fan-assisted combustion system includes a spark-to-pilot
ignitor, 100% premix stainless steel burners, and prejets for input
rate and precision air/gas ratio control.
Blower/Burner assemBly
figure 5.
The intake air screen is attached to the inlet 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.
