Specifications

9 Catalog WMC-4
Figure 4, Control Panel
The control system of the WMC chillers consists
of two major components: the unit control panel,
as shown to the right, and the operator interface
panel as shown on the extreme left of the unit
featured on the cover. Note that the touch screen
panel is on an adjustable arm so that it can be
positioned comfortably for the operator. The
control panel contains a USB port for
downloading the unit’s fault history, major
parameter trends, and the unit operating manual
that is stored in the microprocessor. These design
features built into this control system optimize
ease of operation, reliability, and efficient
operation.
Switches &
EXV Board
Terminal Board
For External
Connections
Unit
Controller
Circuit/Compresso
r #1 controller
The photo to the right shows the unit’s control
panel with the two compressor controllers below
and the unit controller mounted above them. The
unit controller is responsible for functions
involving the entire unit (controlling the
electronic expansion valve, for instance) and is
the interface point for devices and signals external
to the unit. The compressor controllers’ job is to
operate and control the compressors.
Circuit/Compressor
#2 controller
(2)
Communication/
A terminal strip is provided for connection of
external input signals such as load limit and reset
commands and output signals such as alarms and
cooling tower commands.
(2) Compressor
Interface Boards