Product Manual PM WSC/WDC 17
chiller utilizes 1,000 tons (3500 kW) of evaporator and condenser surface. This increases its capacity and also
results in very high efficiency.
Typical efficiencies for a dual compressor chiller, taken from a computer run, look like this:
• Full load efficiency 0.550 kW per ton (6.5 COP)
• 60% load, one compressor 0.364 kW per ton (9.6 COP)
• IPLV 0.415 kW per ton (8.5COP)
Lower Installed Costs
The redundancy feature pays off in lower installed costs
An example of how to incorporate dual compressor chillers into a system requiring redundancy:
Job requirement: 1,200 tons (4200 kW), 50% Backup
Obsolete Single Compressor Method Dual Compressor Method
(2) 600 ton (2100 kW) On Line Units (2) 750 ton (2100 kW) Units with
+ (1) 600 (2100 kW) ton Standby Unit 1,200 (4200 kW) Standby tons *
(3) @ 1,800 ton (6300 kW)Installed Capacity (2) @ 1500 ton (5250 kW)Installed Capacity
* One 750 ton (2100 kW) chiller running on two compressors for 750 tons (2100 kW), plus one 750 ton (2100
kW) chiller running on one compressor for 60% of 750 tons (2100 kW) = 450 tons (1575 kW) for a total of 1200
tons (4200 kW) on 3 of 4 compressors.
The elimination of the extra pumps, valves, piping, controls, rigging, and floor space can result in as much as a
35% reduction in the installation cost for a chiller plant, plus the savings on the chillers themselves.
Bolt Together Construction
The Replacement Market Advantage
• Put 20% or more tons in the same footprint
• Add dual compressor redundancy
• Greatly reduce chiller energy consumption
• Install an unregulated refrigerant
• Opens many options for multiple chiller plants
WDC Chiller Controls
Each model WDC dual compressor chiller comes complete with two compressor-dedicated factory mounted and
wired MicroTech control panels. Individual control panels allow the monitoring of each compressor
independently from the other. Elapsed time, number of starts, percent RLA; are all monitored separately by each
MicroTech control panel. Also individual compressor fault history, setpoint control, loading functions, time of
day starts, etc., can be controlled and monitored.
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