22 Product Manual PM WSC/WDC
Building Management Systems
All MicroTech unit controllers and system controllers are capable of Open Protocol communications providing
seamless integration and comprehensive monitoring, control and two-way data exchange with virtually all
Building Management Systems.
Here are just a few of the 220 points on a WDC chiller that are available remotely through one simple, low cost
twisted-pair interface.
Operating Parameters Safety/Cycling Conditions
Entering/leaving water temperatures High and low refrigerant pressures
Refrigerant temperatures and pressures Oil pressure differential
Motor amps as a percent of FLA Motor condition from embedded sensors
Hours of operation and number of starts System water pump failures
Chilled water and demand limit setpoints High discharge temperatures
Cause and conditions for last eight shutdowns Starter fault
Multiple Machine Control
Two WSC Units or One WDC Dual Compressor Unit
The lead-lag/load balance function is a standard feature of each MicroTech panel. It provides sequencing
control, load balancing and single point control for BMS interface for reset or demand limiting of either
compressor.
Lead-lag can be selected as manual or automatic. In automatic, the compressor with the least starts will start
first and the compressor with the most hours will stop first.
Load balance equalizes the load between the two compressors providing optimum efficiency and preventing
short cycling of the lag compressor.
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