JOHNSON CONTROLS
105
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
6
SECTION 6 – OPERATION
YHAU-CW CONTROL CENTER
The YHAU-CW 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 is used as a control system for lithium bromide ab-
sorption 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,
making information is easier to interpret.
The LCD display allows for a graphic animated display
of the chiller, its sub-systems and system parameters.
In addition, you may view the historical operation of
the chiller as well as the present operation. A Status Bar
displays at all times on all screens. It contains the Sys-
tem Status Line and Details Line, the Control Source,
Access Level, 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 metric and imperial 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 lev-
els 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
Buttons are listed in the order they are
seen on the screen: left to right and top
to bottom.
The Control Center screens have items that are applica-
ble to each feature of the Control Center. This includes
the following common items:
• LOCAL and REMOTE: Buttons that allow you
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 seconds to make the change.
• Operating Status: The display 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 cor-
ner to allow you to stop or start the chiller.
LD20042_UL
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