Specifications

20 Catalog WSC/WDC-4
Multiple Chiller Control
McQuay’s standard MicroTech II control system, as shipped on all units, will control up to three
chillers, either single or dual compressor type. A simple RS 485 interconnection and minor set
point adjustments are all that is required. When a chiller system will have more than three
chillers, McQuay has a flexible and reliable chiller manager available.
Chiller System Manager (CSM)
Application
• Two sizes available, up to 6 chillers or up to 12 chillers
• Two voltages available, 120 VAC or 240 VAC, for world-wide application
• Control chillers in series and/or parallel
• Flexible chiller sequencing of constant volume primary/secondary or primary only systems
• Stand-alone control or easy integration with your choice of third party BAS with open,
standard protocols
Benefits
• Flexibility to accommodate most chiller sequencing schemes for improved system efficiency
and reliability
• Single source responsibility for chillers and chiller management system startup
• Reduced commissioning and installation cost
• Graphical-based application is easy for operators to learn and use
• Scalable platform can grow as the chiller system expands
Capabilities
• Flexible, dedicated or common tower control
• Chilled water control options, variable or constant speed, lead/standby control, loop bypass
valve control
• Graphical scheduling including weekdays/weekends, special events, can use external input
• Password protection
• Load limiting
• Choice of chilled water reset schemes
• Inhibited stage up based on time-of-day or BAS input
• Annunciation, display, logging, and acknowledgement of chiller and system alarms
Figure 6, Typical Display for Three Chiller Setup