Operation
YHAU-C control center
The YHAU-C Control Center, furnished as standard on each chiller, allows for efficiency, monitoring,
data recording, chiller protection, and operating ease. The Control Center is factory-mounted,
wired, and tested. It used as a control system for LiBr absorption chillers.
The panel is configured with a color TFT Display with buttons that are integrated into the display. A
single button reveals a wide array of information on a large, full-color illustration of the appropriate
component. Information is easier to interpret.
The LCD display allows for a graphic animated display of the chiller, its subsystems, and system
parameters. In addition, you can view the historical operation of the chiller along with the present
operation. A status bar displays at all times on all screens. It contains the System Status Line and
Details Line, the Control Source, Access Level, and Time and Date.
The panel display is available in various languages. The language can be changed without having to
turn off the chiller.
Data can be displayed in imperial/metric units plus keypad entry of set points to 0.1 increments.
Security access using passwords is provided to prevent unauthorized changes of set points. There
are three levels of access. Each level has its own password. There are certain screens, displayed
values, programmable set points, and manual controls not shown that are used for servicing the
chiller.
Common items
Note: Buttons are listed in the order they appear on the screen: left to right and top to
bottom.
The Control Center screens have items that are applicable to each feature of the Control Center.
This includes the following common items:
• LOCAL and REMOTE: Buttons used to to switch the operating location between remote and local.
The setting can be changed while the chiller is operating. Press and hold the appropriate button
for 2 sec. to make the change.
• Operating Status: The button appears at the center top of the screen. It shows the following
operating conditions: Stop, Operating, and Failure Activating.
• Failure and Alarm: Warning lamps that light if the chiller has a failure or a warning alarm.
• Date and Time: Shown on the upper right corner of each screen.
• OPER. and STOP: Buttons in the lower left corner used to stop or start the chiller.
113YHAU-C Single Effect Steam-Fired Absorption Chiller
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