JOHNSON CONTROLS
103
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
6
SECTION 6 – OPERATION
YHAU-CL/CH CONTROL CENTER
The YHAU-CL/CH Control Center, furnished as stan-
dard 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 bro-
mide 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. In-
formation 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
NOTE: 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 appli-
cable to each feature of the Control Center. This in-
cludes 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 button appears at the cen-
ter top of the screen. It shows the following op-
erating 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.
When you press the
OPER.
button while the chiller is
stopped, or
STOP
while the chiller is operating, a con-
firmation message appears. Press
YES
or
NO
depend-
ing on whether you want to continue or cancel your
selection.
LD27805_UL
