Jetson FWCD Series, Installation Operation & Maintenance, Page: 13 / 96

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Digit 12 — Efficiency/Capacity
1 = Standard Efficiency – Standard sized evaporator.
2 = High-Capacity Evaporator – High-capacity evaporator for glycol applications or for 40F
leaving water applications.
Digit 13 — Design Sequence
0 = Factory Assigned
Digit 14 — Array System
0 = Non-Array System – FWCD chillers can be applied in standalone applications needing
between 20 to 75 tons of cooling. In standalone applications, chiller headers are not required and the
“no header” option can be selected in Digit 36.
1 = Array System - More than one FWCD modular chiller may be piped together (to form an array
of chillers) for higher capacity and/or redundant chiller applications, an array controller package
must be provided from the factory. The number of modular chillers that can be physically piped
together to form an array and share a common header is limited to approximately 300 total tons or
900 gpm.
Digit 15 — Evaporator Heat Exchanger Type
0 = Brazed Plate - Brazed plate heat exchangers are one of the most efficient ways to transfer heat.
They are designed to provide unparalleled performance with the lowest life-cycle cost.
Digit 16 — Evaporator Fluid Type
0 = Water
2 = Ethylene Glycol
3 = Propylene Glycol
Digit 17 — Evaporator Flow
0 = Constant Flow Primary - Constant flow pumping systems utilize a staged cooling system and
a constant flow water pumping system. No modules are isolated at part load. Flow from “off”
chillers mixes with the flow from active chillers in creating the leaving array temperature. The load
may not be less than 25% of the full load in constant flow applications.
1 = Variable Flow Primary - Variable flow systems utilize compressor staging and motorized
isolation valves with a variable flow water pumping system to modulate cooling and water flow to
meet chilled water needs and save operating energy costs. Cooling capacity is modulated by staging