Introduction; Tools - Bradford White ERE240 Service Manual

INFORMATION
System Description
The operation of the ICON E™ Electronic Control system is unlike that of the traditional snap disc
thermostats in several ways. Troubleshooting the operation of the control differs from the older models.
Power-Up
When the control is initially powered, it will go through several stages. Upon any power-up cycle the LED will flash
rapidly in an Amber-Green pattern as the control undergoes an initial 5 second sequence to initialize and ensure
everything in the control is working correctly. If the water heater is new and has never run a heating cycle, or if the
heater was drained to replace a burned out heating element, the control will run StartGuard™ prior to heating the
water. The control will enter StartGuard™ only if the Setpoint Knob is moved after power is applied and set
to a temperature that calls for the heating elements to turn on. StartGuard™ will test to ensure the tank is
full of water and the elements are functioning correctly. The test is indicated by an Amber-Green flash pattern
and should take less than 5 minutes. After the initial power-up cycles finish, the control moves into normal operation
indicated by a single green flash on the LED. To heat up the tank the water heater begins by first turning on the
upper element.
Normal Operation
The pattern of element operation for the ICON E™ system is similar to that of a traditional Bi-metal disk water
heater. It prioritizes heating the upper portion of the tank to allow for faster recovery of the water heater when
depleted. This means that upon startup the water heater begins by heating up the upper portion of the tank and
then moves to recover the bottom to setpoint temperature. When the water heater is already hot and experiences a
draw it will begin by turning on the lower element and if the tank continues to be depleted past a certain point it will
switch to the upper element until it satisfies the upper portion of the tanks demand. At this point the heater will
recover the lower portion of the tank to setpoint temperature.
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