Safety Functions Of The Controls; Flame Detection; Eco (Energy Cut Off); Pressure Switches - Rheem TRITON Service And Training Manual

Safety Functions of the Controls

Flame Detection

Proof of flame is accomplished by flame rectification via a burner sensor
electrode and earth ground. The presence of a flame is measured via a
flame rod that points into the flame. With the flame rod energized and a
flame present to bridge the space between the flame rod and earth ground
(the burner), the resultant flow of electrons (called the flame current) is
monitored by the controller. The controller requires the flame current to
attain a certain minimum value (0.5 micro amps) as a means to gauge the
quality and stability of the flame. Absent of an acceptable flame current
value, the controller will render the heater into an error condition
A001/A029 during ignition and start up; or A002/A030 if the unit is in
the middle of a heating cycle.

ECO (Energy Cut Off)

Pressure Switches

Pressure switches are incorporated to provide proof of fan (blower)
operation and to detect blocked inlet and outlet vent conditions. The
controller monitors the status of the normally open or normally closed
pressure switches and in the event of abnormal conditions, the controller
will render the heater into an error condition.

Vent Temperature (Flue Gas) Sensor

The ECO switch functions as a high limit
switch responsive when the water
temperature approaches 205° F. If the water
temperature inside the tank reaches 203° F,
the ECO switch (normally closed) will
open. The controller will disable all heating
functions and will render the heater into an
error condition.
A vent temperature switch is incorporated to detect
excessive heat at the vent exhaust location. This protects the plastic PVC piping
from damage. The controller monitors the status of the temperature switch and
in the event of abnormal conditions (temperatures approaching 155
the RPM to lower flue temperatures) the controller will render the heater into
an error condition.
Triton Service Manual SVC1020T ; Rev 4
2 5
80 and 100 gallon chassis
o
F decreases