Jetson FWCD Series, Installation Operation & Maintenance, Page: 14 / 96

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compressors and isolating modules based on the desired leaving water temperature. Water flow
control is field provided and is usually modulated with VFD controlled variable flow primary
pumps based on the differential pressure across the water system.
Digit 18 — Evaporator Temperature Range
0 = Standard Cooling 40 to 65°F [5.5 to 18.3°C] – The chiller with standard evaporator must not
be operated with a leaving water temperature of less than 42°F for a plain water application. The
chiller with
high-capacity evaporator must not be operated with a leaving water temperature of less
than 40°F for a plain water application.
1 = Standard Cooling/Ice Making 20 to 65°F [-6.7 to 18.3°C] - The dual roles of an ice-making
chiller can substantially reduce the installed cost of the system. An ice-making chiller is NOT a
conventional chiller with two different leaving-fluid temperature setpoints.
An ice-making chiller
operates at maximum capacity when in ice-making mode. It continues to operate at maximum
capacity until the leaving-fluid temperature reaches the target setpoint. At a 10°F delta across the
evaporator, this limit indicates that all of the water inside the ice storage tanks has been frozen. An
external signal can be sent to the chiller to reset the chilled water setpoint back to conventional
chilled water leaving fluid temperature and the chiller will return to traditional chiller operation.
Digit 19 — Evaporator Control Valves
0 = Manual Balancing Isolating Valves - For a proper hydronic balance in a constant flow system,
manual balancing valves are factory installed in array headers. These valves can also be used to
isolate a module in an array for service or cleaning.
1 = Motorized Chilled Water Isolating Valve - Variable flow systems isolate modules not needed
to meet current cooling or heating capacity by isolating modules with a factory installed motorized
on-off valve.
2 = No Valves (Standalone Chiller) – Balancing / isolating valves are not required when chiller is
used in single unit configuration.
Digit 20 — Condenser Heat Exchanger Type
0 = Brazed Plate – Brazed plate heat exchanger with grooved pipe water connections.
1 = Shell and Tube - Shell and tube heat exchanger with grooved pipe water connections.
5 = Remote Condenser
– Water-cooled condenser is removed and discharge and liquid line
connections are provided for connection to remote air-cooled condenser.
Digit 21— Condenser Fluid Type
0 = Water
2 = Ethylene Glycol
3 = Propylene Glycol
9 = Not Applicable — Compressor-Chiller