FORM 155.32-ICOM2.EN.UL
SECTION 6 – OPERATION
ISSUE DATE:1/10/2018
JOHNSON CONTROLS
89
SECTION 6 – OPERATION
YHAU-CGN/H CONTROL CENTER
The YHAU-CGN/H Control Center, furnished as standard on each chiller-heater, allows for
efficiency, monitoring, data recording, chiller-heater protection, and operating ease. The
Control Center is factory-mounted, wired, and tested. It used as a control system for LiBr
absorption chiller-heaters.
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-heater, its sub-systems
and system parameters. In addition, you may view the historical operation of the chiller-
heater as well as 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, Time
and Date.
The panel display is available in various languages. The language can be changed without
having to turn off the chiller-heater.
Data can be displayed in 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-heater.
COMMON ITEMS
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 that allow you to switch the operating location be-
tween remote and local. The setting can be changed while the chiller-heater is oper-
ating. 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-heater 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 to allow you to stop or start the
chiller-heater.
Control buttons are listed in the order they are seen on the screen: left to right and top
to bottom.
