18 Product Manual PM WSC/WDC
The lead-lag/load balance function is a standard feature of each MicroTech panel and, therefore, of the WDC
chiller. Smart scheduling by the lead-lag/load balance function assigns the compressor with the fewest starts as
lead, and will only start the lag compressor when proof of sufficient load has been established. The lead-lag
function will stop the compressor with the most hours when the load decreases to single compressor range.
During two compressor operation, the load balance function will equalize the load between each compressor,
providing optimum unit efficiency.
25% or greater annual kWh savings over the range of 5% to 60% design tons
The majority of comfort cooling systems operate at 60% or less of building design tons for most of the year. A
great number of those operating hours occur between 50% and 60% design cooling capacity.
For that reason, the Model WDC chiller was designed to produce up to 60% unit capacity with a single
operating compressor, efficiently and reliably.
That performance is achieved by a combination of individual component features that include compressor
design, operating control, double heat transfer surface, refrigerant and refrigerant flow control.
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