Control Overview - A.O. Smith Cyclone Xi Service Handbook

CONTROL OVERVIEW

Interaction with the water heater controller is through
an LCD display called the Universal Interface
Module (UIM).This screen is also referred to as the
"desktop" or "desktop menu". Up and down buttons
and three operation buttons allow navigation through
the control menus and to make adjustments to the
water heater. Operation of the three lower buttons is
defined immediately above them on the screen.
While the water heater is operating, the user interface
will display the desktop screen (if there are no active
faults or warnings).
● An example of this screen is shown below.
The first temperature on this screen is the
●
temperature of the water inside the tank.
● The second temperature on this screen is the
Operating Set Point.
The Operating Set Point is the temperature at
●
which the water heater will maintain the water
inside the tank.
● The third line on the screen is a text
description of the Operational State of the
water heater. The operating state of the water
heater is also indicated graphically by status
icons.
OPERATION
BUTTONS
A.O. Smith – Technical Training Department
CYCLONE Xi COMMERCIAL GAS WATER HEATER
BTH 120 thru 500 SERVICE HANDBOOK
UP AND
DOWN
BUTTONS
Servicing should only be performed by a Qualified Service Agent
The table of status icons describes graphically
operational details of the water heater. Below is a
legend of all the status icons:
Status
Icon
The temperature of the water in the tank has
fallen and the water heater will now initialize a
new heating cycle.
The temperature of the water in the tank has
reached the Operating Set Point.
The control is unable to initiate any further
heating cycles. This is usually caused by a fault
condition detected by the control, but can also
occur when an external system (like an energy
management system) has asked the water
heater to discontinue any further heat cycles.
The blower is being energized.
The blower pressure switch has been made.
The igniter has been energized.
The igniter has been energized and sufficient
current for ignition has been detected.
The control has requested that the gas valve
be turned on.
The control has sensed flame in the burner.
The control has detected a fault condition. A
fault condition will cause the water heater to
discontinue operation.
The control has detected a warning condition.
These conditions will not cause the water
heater to discontinue further heating cycles, but
does merit attention.
17
Description
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