Product Overview
2.5 The Control System (ASMUC.6 Controller)
By default, the ASMUC.6 controller can control up to 6 AIRSYS Precision Cooling WPUs (16 with expansion
module) organized in up to 4 zones. The setpoint for each zone can be adjusted independently.
The controller box is factory programmed with standard industry setpoints but can be configured on-site or
remotely to meet specific needs. Settings are retained in the event of a power loss. In addition, all WPUs have
integrated control modules that are the same as those in the controller box. If communication between the
units and controller is lost, the units will cool independently using the last given controller settings and
information from onboard temperature and humidity sensors.
2.6 Ease of Control and Configuration
The controller is controlled through the Programmable Graphical Display (PGD) interface. The PGD and button
actions are explained in more detail starting on Page 48. Using the PGD interface, the user can:
• Check the status of the HVAC system, such as sensor readings and operating mode
• Change factory setpoints
• Place the system temporarily into comfort mode
• Review alarms and alarm history
Labeling on the outside of the controller box provides a convenient guide on how to access the most common
functions. The same functions can be accessed remotely via an IP communication interface built into the
controller. The units are also pre-wired to allow for a PGD to connect directly to the unit, allowing for testing
and configuration directly from the unit.
2.7 Synchronized Cooling
When mechanical cooling is required to maintain the site temperature, all available units will run at low speed
as opposed to one unit taking the full load. This increases overall system efficiency and reduces wear and tear
on the compressor. If one of the units is taken offline, the others will adjust their speeds accordingly to maintain
the site temperature.
2.8 Standalone Mode
The system can operate in fully functional Standalone Mode when communication is lost between HVAC and
controller. This includes including free cooling, mechanical cooling, dehumidification, and heating. This
eliminates the controller as a potential single point of failure for the HVAC system.
2.9 Heat Load Matching
The variable capacity units can adjust the compressor run speed to exactly match the heat load as opposed
to cycling on and off to maintain a setpoint. Since most of the component stress occurs during startup and
shutdown, heat load matching increases overall system reliability and efficiency.
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